CN101503952B - Seat seal mechanism used for packing type tail pipe hanger - Google Patents
Seat seal mechanism used for packing type tail pipe hanger Download PDFInfo
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- CN101503952B CN101503952B CN2008100062182A CN200810006218A CN101503952B CN 101503952 B CN101503952 B CN 101503952B CN 2008100062182 A CN2008100062182 A CN 2008100062182A CN 200810006218 A CN200810006218 A CN 200810006218A CN 101503952 B CN101503952 B CN 101503952B
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Abstract
The invention provides a sealing mechanism used for a packer type liner hanger, which comprises a feeding tool, a sealing shell 23, a tie-back cylinder 4, a packer and the like, wherein the sealing shell 23 is provided with a plurality of through holes and internally provided with a safety chock block 24; and the inner wall of the tie-back cylinder 4 is provided with an annular shallow groove 44 on the position corresponding to the safety chock block 24. When a back-off nut 21 in the feeding tool is tightened with the sealing shell 23, one end of the safety chock block 24 is squashed into the annular shallow groove 44, so that the feeding tool, the sealing shell 23 and the tie-back cylinder 4 are connected into a whole through the safety chock block 24 to prevent the advanced sealing in the process of running a liner. A sealing short node 6 in the feeding tool and the outside of a sealing sleeve 11 are sleeved with a protecting hydraulic cylinder 10, and a sealing chock block 12 is protected in the protecting hydraulic cylinder so as to prevent that the sealing chock block is accidentally ejected out and sealed in advance in the process of lifting the feeding tool after loosing backing off, to prevent the sealing chock block from scratching the inner wall of the tie-back cylinder at the same time, and to solve the problem existing during sealing the packer in the prior art.
Description
Technical field
The present invention relates to a kind of seat sealing mechanism that is used for packing formula extension hanger, further saying so to relate to is used for the matching used seat of a kind of and packing formula extension hanger sealing mechanism that high angle hole, extended reach well, horizontal well and ultradeep well drilling liner cementing are used.
Background technology
In the drilling liner cementing operation of ultradeep well, high angle hole, horizontal well, extended reach well; Because send into that drilling tool is long, the tail pipe string do not reach between two parties that hole angle is bigger than normal, factor such as be hampered; Shi Changhui causes the packer at hanger top to shift to an earlier date the seat envelope; Cause the well cementing operation can't be normal, handle this type of accident consume significant again simultaneously.
Present packer for the hanger top; Its envelope mode is for applying downward axial load to the tieback tube through the seat block piece on the running tool seat envelope pipe nipple; Be delivered to separator seat big envelope through the tieback tube again, come base sealed packer thereby cut off an envelope shear pin.But in the drilling liner cementing operation of ultradeep well, high angle hole, horizontal well, extended reach well, this type running tool is because its structure problem causes a lot of operation problems.Such as, when in the process that packing formula hanger is sent to projected depth, being hampered, usually will on carry or transfer and send into drilling tool, be prone to cause packer seat envelope in advance.In addition, in high angle hole, because frictional resistance is bigger; On limited, carry in the distance being difficult to judge whether running tool separates with hanger, does not note slightly, seat block piece promptly ejects from the tieback tube; When putting back to running tool, will cause seat envelope in advance, the accident that causes cementing operation normally to carry out.Also have, seat block piece moving up and down in the tieback tube is prone to cause the scuffing of tieback tube inner surface, thereby causes the blow-by of later stage tieback well cementing operation, influences tieback well cementing operation quality.
Summary of the invention:
Be problems such as the incident seat in advance of solution packing formula hanger envelope, the inventor has designed and developed a kind of novel packing formula hanger seat sealing mechanism that is applicable to ultradeep well, high angle hole, extended reach well.It can deliver to design attitude smoothly with tail pipe, in structure, has designed to prevent the packer device of seat envelope in advance, for the smooth implementation of operations such as being lowered to of packing formula extension hanger, seat extension, cementing, seat envelope provides effective technical guarantee.
The objective of the invention is provides a kind of safe and reliable seat sealing mechanism for complicated well with packing formula hanger.
A kind of seat sealing mechanism that is used for packing formula extension hanger of the present invention comprises running tool, can, tieback tube and packer etc.Wherein on can, have some through holes, be provided with safety catch in it, have annular shallow slot on the position tieback tube inwall corresponding to through hole.When the back-off nut in the running tool and can are screwed; The back-off nut is clamp-oned safety catch in the cannelure of tieback tube inwall; Running tool, can and tieback tube connect as a whole through safety catch like this; Do not have to axial motion between them, can prevent that tail pipe is lowered in the process seat envelope in advance.On the seat envelope pipe nipple in this external running tool, outside the seat big envelope tube that seat block piece overcoat, be with the protection fluid cylinder again, and will protect a fluid cylinder and a seat big envelope tube to be fixed together through shear pin, with seat block block protection in protecting fluid cylinder.With prevent after the running tool back-off is given up on the unexpected seat envelope in advance that ejects of seat block piece in the process carried, also prevented that the seat block piece from scratching tieback tube inwall simultaneously.Thereby the problem that exists in the solution prior art.
The seat sealing mechanism of the invention described above, the visible following description of concrete structure.
Seat sealing mechanism of the present invention comprises running tool, can, tieback tube and packer etc.
Wherein said packer comprises packer body and the seat big envelope that is enclosed within packer body middle part, and both are tubular structure, fix with shear pin between it.Said can and tieback tube also are tubular structure.The lower end that big envelope above part in the packer body seat of honour is inserted can be being threaded, and is provided with sealing.The tieback jacket casing is in the can outside, and the lower end of tieback tube is inserted in the upper end of packer body seat of honour big envelope, and to be threaded.Said running tool inserts in the tieback tube; Back-off nut in the running tool in the back-off releasing gadget inserts in the can in the tieback tube, and running tool connects can and following pipe string thereof through the left hand thread between back-off nut outer wall top and the can upper inside wall.
Wherein said running tool comprises lifting sub, seat envelope pipe nipple, back-off releasing gadget and central tube.
Lifting sub, seat envelope pipe nipple and central tube are tubular structure in the above-mentioned running tool.The lifting sub lower end inserts the upper end of seat envelope pipe nipple and to be threaded, the junction is provided with sealing.Seat envelope pipe nipple lower end inserts the upper end of back-off top connection in the back-off releasing gadget and to be threaded, the central tube upper end inserts the lower end of back-off lower contact in the back-off releasing gadget and to be threaded, said each coupling part is equipped with sealing.
Back-off releasing gadget in the above-mentioned running tool is the structure of common back-off releasing gadget in the packing formula extension hanger running tool in the prior art, as: said back-off releasing gadget comprises back-off top connection and back-off lower contact.Back-off top connection and back-off lower contact are tubular structure.The upper end of back-off lower contact inserts the lower end of back-off top connection and to be threaded, the junction is provided with sealing.Back-off bearing group, load support cover and back-off nut are installed in the back-off lower contact from top to bottom.Wherein the middle part of back-off lower contact outer wall is provided with a low wide and up narrow step, and the load support cover is a tubular structure, and the footpath, inwall middle part of tube upwards inwardly is provided with annular projection, may be stuck on the step of back-off lower contact outer wall.Load support cover inwall annular projection is divided into upper shell and lower shell with the load support cover.Load support cover upper shell can be placed the back-off bearing group, and after back-off top connection and back-off lower contact were screwed, the lower surface of back-off top connection was against on the upper surface of back-off bearing group.Be fixed with the back-off spring on the lower surface of load support cover inwall annular projection, the other end of back-off spring be enclosed within on the back-off nut of back-off lower contact outer wall bottom.Be nested on the outer wall of back-off lower contact of part with the back-off nut, cut out two symmetrical planes of action with parallel axes.Back-off nut inner wall shape is the outer wall shape-consistent of the back-off lower contact of part herewith.When the back-off lower contact was rotated, the plane of action on its outer wall can drive the back-off nut that is nested with it and rotate.The outer wall end of back-off lower contact also is provided with a low wide and up narrow step, and when the back-off lower contact rotate to drive the back-off nut that is enclosed within outside it and can and screws, the lower surface of back-off nut was against on this step.When the back-off nut back-off under the drive of back-off lower contact and can give up separate after, can be retracted in the lower shell of load support cover owing to the back-off spring action.
In above-mentioned can and the part that is nested below the back-off nut thread coupling part; On the same cross section of can, have some (two or more) through hole, be enclosed within on the outer tieback tube inwall of can corresponding to lead to the hole site and have annular shallow slot.In the through hole of can, safety catch is installed; The radical length of safety catch is greater than the wall thickness of can; The one of which end is stuck in the annular shallow slot of tieback tube; One end is against on the outer wall of back-off nut, and safety catch is fixed in the space that forms between tieback tube inwall annular shallow slot, can through hole and the back-off nut outer wall thus, in case the non-return extend neck issues the axial displacement of looks for can in the effect of external force.
The vertical cross-section of the annular shallow slot of the above tieback tube inwall is a trapezium structure, and the longitudinal length of notch is greater than the longitudinal length of bottom land; The vertical cross-section of said safety catch is a rectangular configuration; Its last inferior horn that inserts an end of annular shallow slot is and the corresponding chamfering of the trapezoidal shape of annular shallow slot vertical cross-section; So that give up at the running tool back-off, the back-off nut up after; Carry out seat envelope tieback tube when descending safety catch can radially inwardly regain the annular shallow slot that skids off tieback tube inwall smoothly, remove with knot the seat envelope accomplished in the restriction of tieback tube axial displacement smoothly.
The horizontal section of the above safety catch preferably is T font structure: an end that is stuck in tieback tube annular shallow slot is the wide end of T font, and an end that is against on the back-off nut outer wall is the narrow end of T font.The through hole horizontal section that is located at accordingly on the can also preferably is T font structure, constitute by wide hole and narrow hole, wide hole and narrow aperture between form a step.The radical length in its wide hole is more than or equal to the radical length of the wide end of safety catch and the spacing sum between can outer wall and tieback tube inwall.In the time of thus in safety catch is fixed on the space that forms between annular shallow slot, can through hole and the back-off nut outer wall; Step on the wide end inside wall of safety catch and can in the through hole leaves the gap diametrically; When seat seals; The back-off nut is carried on, and under the descending effect of tieback tube, the annular shallow slot on the tieback tube inwall forces safety catch to produce radial displacement; Said gap makes safety catch can inwardly move radially the constraint of certain displacement end to the tieback tube, but can not drop in the inner chamber of can.
The lower surface of the above back-off nut is preferably that it can push an end of safety catch in the annular shallow slot of tieback tube inwall smoothly after inverted cone surface screwed in can with convenient back-off nut.
In the above seat sealing mechanism of the present invention, the outside in seat envelope pipe nipple stage casing is with a big envelope tube in the said running tool.Seat big envelope tube is a tubular structure.Seat big envelope tube epimere and seat seal between the part that pipe nipple is nested through being threaded, and are provided with sealing.Present big envelope tube hypomere and the part that seat envelope pipe nipple is nested have some (two or more) axially bar-shaped trough on seat envelope pipe nipple outer wall, bar-shaped trough is preferably even distribution.Correspond on the seat big envelope tube of bar-shaped trough position and have axial strip through-hole, the upper edge of through hole is lower than the bar-shaped trough upper edge, and the lower edge of through hole is higher than the bar-shaped trough lower edge; In the space that through hole surrounded of the bar-shaped trough of said seat envelope pipe nipple and seat big envelope tube, a block piece is installed.Transmit the downforce that the tieback tube is applied when being used for present the envelope, to realize the seat envelope.Seat block piece bottom has spring towards the one side of seat envelope pipe nipple by the screw crosswise fixed, is used for flicking a block piece.The radial hole that preferred present block piece is provided with towards a sidewall of seat envelope pipe nipple is in said spring is positioned over.The upper surface of seat block piece is lower than a big envelope tube through hole upper edge, and its lower surface is higher than a big envelope tube through hole lower edge.Seat inboard, block piece upper and lower end face is respectively arranged with upwards and downward convexity, and when seat block piece is flicked, a seat block piece ejects a seat big envelope tube through hole, and the convexity on its upper surface and the lower surface is stuck in the big envelope tube.The preferred up-narrow and down-wide wedge of seat block piece.
On above-described seat big envelope tube, be with the protection fluid cylinder: the protection fluid cylinder is a tubular construction, and its epimere is higher than a upper surface of big envelope tube and directly overlaps on the present envelope pipe nipple, and is provided with sealing in the part that is nested.Simultaneously on the inwall of partial protection fluid cylinder that is nested, be provided with the contraction jump ring.Outside the present big envelope tube of hypomere cover of protection fluid cylinder, it is fixed through shear pin with the part that is nested of lower part with seat big envelope tube through hole lower edge, thus can be with seat block block protection in the cavity that protection fluid cylinder and seat envelope pipe nipple bar-shaped trough, seat big envelope tube through hole are formed.The outer wall of seat big envelope tube through hole upper edge part has outside radial protrusion ring, and this protruding ring outer wall is that clearance-type cooperates with the inwall of protection fluid cylinder hypomere, and is provided with sealing.The outer wall that removes the above seat big envelope tube of this part comprises its upper surface with leaving the space between the inwall of protecting fluid cylinder, the contact of promptly different protection fluid cylinder.Seat big envelope tube through hole upper edge constitutes cavity with top and an inwall of protecting fluid cylinder and a seat envelope pipe nipple outer wall thus, is provided with pressure transmission hole with corresponding envelope pipe nipple of cavity, and this pressure transmission hole is a through hole; The hydraulic pressure transfer that when building the pressure, can seat be sealed the pipe nipple inner chamber is in cavity; Under the effect of pressure, cut off the shear pin that protection fluid cylinder and seat big envelope tube bottom are fixed together, the protection fluid cylinder is up; When going upward to, the protection fluid cylinder do not limit the position that a block piece ejects fully; On the outer wall of this position corresponding to seat envelope pipe nipple, be provided with the jump ring groove in advance, the contraction jump ring that is provided with on the protection fluid cylinder epimere inwall snaps in the jump ring groove, axially the moving up and down of limiting protecting fluid cylinder.Seat block this moment piece ejects seat big envelope tube under the effect of spring.
The effect that the protection fluid cylinder more than is set is: at first, prevented that impurity such as sand setting or landwaste from entering into the ejection of influence seat block piece in the big envelope tube; Secondly, prevent the scuffing of a block piece to the tieback tube inner surface; Once more, in conjunction with the effect of compression spring, in the present big envelope tube of stop limits; Submit on after the running tool back-off is given up and judge into instrument and to give up when separating; Increased running tool on carry judging distance, even because seat block piece is partly proposed the tieback tube, a seat block piece can freely not flick yet; Cause the running tool can't replaced, or prevent seat envelope in advance.
In the seat sealing mechanism of the present invention in addition, be with cock cap on the lifting sub described in the said running tool, be fastened on the lifting sub through hold-down screw.Spherical or the wedge shape wide at the top and narrow at the bottom of the optional bowling of cock cap; When said running tool inserts in the tieback tube; After left hand thread between said back-off nut outer wall top and the can upper inside wall connected, cock cap was stuck in the upper end nozzle of tieback tube, covers the upper end nozzle of tieback tube.Can prevent effectively that impurity such as sand setting, fragmentary debris in the well from entering in the annular space that tieback tube and running tool form, guarantee the smooth realization that back-off in the later stage operation is given up etc. and to be moved.
Described seat sealing mechanism of the present invention in addition also is equipped with the sealed core group between central tube outer wall and can inwall, be used to form sealing in the pipe, makes to be advanced into the outer annular space of tail pipe under the flow through central tube, and operates for building the pressure confined space is provided.
More than its operating principle summary of seat of the present invention sealing mechanism be: running tool is connected with can through the back-off nut; And can and tieback tube are connected as a single entity through safety catch; Do not have axially-movable each other; Both made to be lowered in the process to be hampered, and also can not cause the envelope of seat in advance of packer because of the put-on and delegated of sending into drilling tool at tail pipe.After present extension finished and guarantees that seat is hung successfully, a few carried out back-off just to change the back-off nut, on carry certain distance and judge and to give up because the protection of fluid cylinder is arranged, a block piece was positioned at beyond the tieback tube top, can not cause in advance sealing yet; After guaranteeing the back-off success, add hydraulic pressure and cut off protection fluid cylinder shear pin, the protection fluid cylinder goes upward to jump ring groove position, gets out of the way a block piece, makes it under spring action, touch tieback tube inwall; Continue to build the pressure to the ball seat shear pin and cut off, set up circulation, C.I.P, on submit into instrument and make a block piece be positioned at tieback tube top, the complete spreading of seat block piece this moment is transferred running tool to certain tonnage, can realize packer set.
The seat sealing mechanism that is used for packing formula extension hanger of the present invention has following outstanding feature:
1) running tool is as independent parts, can with mechanical type hanger or the supporting use of fluid pressure type hanger;
2) seat big envelope and seat envelope pipe nipple passed through to be threaded and the annular space that forms in several block pieces are arranged; In the radial hole of present block piece the compression spring is arranged;
3) present big envelope excircle is provided with the protection fluid cylinder, will protect fluid cylinder to be connected with the seat big envelope through shear pin; Interior dress anti-back jump ring is designed with pressure transmission hole and jump ring groove on the present envelope pipe nipple on the inwall of fluid cylinder upper end, and the anti-back jump ring on the protection fluid cylinder can be stuck in the jump ring groove of envelope pipe nipple and firmly limit the position after fluid cylinder is creeped; Thereby since designed the protection fluid cylinder increased running tool on propose displacement, be convenient to the judgement of giving up of running tool; Prevented of the scuffing of seat block piece simultaneously to the tieback tube inner surface
4) in several through holes of can hoop, be provided with several safety catch; When back-off nut and can are screwed; The light beam face of back-off nut lower end is clamp-oned safety catch in the cannelure of tieback tube endoporus; Running tool, can and tieback tube connect as a wholely through safety catch like this, do not have motion to axial between them, can prevent that tail pipe is lowered in the process seat envelope in advance.
Of the present invention be used for packing formula extension hanger the seat sealing mechanism can be accurate, safe hanger is sent to design attitude; Be admitted in the process at hanger, can not cause the envelope of seat in advance of packer because of the activity of sending into drilling tool; Accomplish the separating action and the packer set action of running tool and hanger smoothly.
Description of drawings
Fig. 1 is used for the overall structure sketch map of the seat sealing mechanism of packing formula extension hanger for the present invention.
Fig. 2 is the enlarged diagram of protection fluid cylinder part-structure in the seat sealing mechanism of the present invention shown in Figure 1.
Fig. 3 is the enlarged diagram of safety catch part-structure in the seat sealing mechanism of the present invention shown in Figure 1.
Fig. 4 is an A-A place cross-sectional structure enlarged diagram among Fig. 1.
After Fig. 5 gives up back-off nut and can back-off for seat sealing mechanism of the present invention is in, the overall structure sketch map during running tool proposition tieback tubular attitude.
The enlarged diagram of safety catch part-structure when Fig. 6 gives up for back-off nut in the seat sealing mechanism of the present invention and can back-off.
After Fig. 7 proposed the tieback tube for seat sealing mechanism of the present invention is in running tool, the protection fluid cylinder was opened the overall structure sketch map when preparing seat envelope state.
When Fig. 8 is in Fig. 7 state for seat sealing mechanism of the present invention, the enlarged diagram of protection fluid cylinder part-structure.
Fig. 9 is in the overall structure sketch map that presses down when sending into tool seat sealed packer state for seat sealing mechanism of the present invention.
When Figure 10 is in Fig. 9 state for seat sealing mechanism of the present invention, the enlarged diagram of safety catch part-structure.
Figure 11 is a B-B cross-sectional structure enlarged diagram among Fig. 9.
The specific embodiment:
Below in conjunction with embodiment, further specify the present invention.
The objective of the invention is provides a kind of safe and reliable seat sealing mechanism that comprises running tool for packing formula hanger.As shown in Figure 1, seat sealing mechanism of the present invention comprises running tool, can 23, tieback tube 4 and packer etc.
Wherein said can 23 is tubular structure with tieback tube 4, and tieback tube 4 is enclosed within can 23 outsides.The two ends up and down of tieback tube 4 all grow the two ends up and down of can 23.
Wherein said packer comprises packer body 31 and the seat big envelope 29 that is enclosed within packer body middle part, and both are tubular structure, and is fixing with packer shear pin 28 between it.The lower surface 40 of present big envelope 29 and the convexity of packer body 31 bottoms are topped bar packing element group 30 have been installed between 41.
The lower end that the part of said packer body 31 seat of honour big envelopes more than 29 inserted said can 23 to be being threaded, and is provided with sealing.The bottom of packer body 31 is used for the union tail hanger.The lower end of tieback tube 4 is inserted in the upper end of packer body 31 seat of honour big envelopes 29, and to be threaded.
Wherein running tool comprises lifting sub 1, seat envelope pipe nipple 6, back-off releasing gadget and central tube 39.
Lifting sub 1, seat envelope pipe nipple 6 and central tube 29 are tubular structure in the above-mentioned running tool.Lifting sub 1 lower end inserts the upper end of seat envelope pipe nipple 6 and to be threaded, the junction is provided with sealing.Seat envelope pipe nipple 6 lower ends insert the upper end of back-off top connection 17 in the back-off releasing gadget and to be threaded, central tube 39 upper ends insert the lower end of back-off lower contact 20 in the back-off releasing gadget and to be threaded, said each coupling part is equipped with sealing.
Said back-off releasing gadget comprises back-off top connection 17 and back-off lower contact 20.Back-off top connection 17 is tubular structure with back-off lower contact 20.The upper end of back-off lower contact 17 inserts the lower end of back-off top connection 20 and to be threaded, the junction is provided with sealing.Back-off bearing group 18, load support cover 19 and back-off nut 21 are installed in back-off lower contact 20 from top to bottom.Wherein the middle part of back-off lower contact 20 outer walls is provided with a low wide and up narrow step.Load support cover 19 is a tubular structure, and the footpath, inwall middle part of tube upwards inwardly is provided with annular projection, is stuck in the step place of back-off lower contact 20 outer walls.Load support is overlapped 19 inwall annular projections the load support cover is divided into upper shell and lower shell.Load support is overlapped 19 upper shells can place back-off bearing group 18, and after back-off top connection 17 and back-off lower contact 20 were screwed, the lower surface of back-off top connection 17 was against on the upper surface of back-off bearing group 18.Load support is overlapped on the lower surface of 19 inwall annular projections and is fixed with back-off spring 37, the other end of back-off spring 37 be enclosed within on the back-off nut 21 of back-off lower contact 20 outer wall bottoms.Be nested on the outer wall of back-off lower contact 20 of part with back-off nut 21, cut out two symmetrical planes of action 33 with parallel axes.Back-off nut 21 inner wall shape are the outer wall shape-consistent of the back-off lower contact 20 of part herewith.When back-off lower contact 20 was rotated, the plane of action 33 on its outer wall can drive the back-off nut 21 that is nested with it and rotate.The outer wall end of back-off lower contact 20 also is provided with narrow step on the complimentary close, rotates when driving the back-off nut 21 that is enclosed within it outside and can 23 and screwing when back-off lower contact 20, and the lower surface of back-off nut 21 is against on this step.When back-off nut 21 back-off under the drive of back-off lower contact 20 and can 23 give up separate after, can under back-off spring 37 effect, be retracted in the inner chamber 43 (as shown in Figure 6) that load support is overlapped 19 lower shells.
Said running tool inserts in the tieback tube 4; In the can 23 that back-off nut 21 in the running tool in the back-off releasing gadget inserts in the tieback tube 4, running tool connects can 23 and following pipe string thereof through the left hand thread between back-off nut 21 outer wall tops and can 23 upper inside wall 22.
In the seat sealing mechanism of the present invention as shown in Figure 1, be with cock cap 3 on the said lifting sub 1, be fastened on the lifting sub 1 through hold-down screw 2.Cock cap 2 is that bowling is spherical, and after said running tool inserted in the tieback tube 4, and the left hand thread 22 between said back-off nut 21 outer wall tops and can 23 upper inside wall connects, cock cap 2 was stuck in the upper end nozzle of tieback tube 4, covers the upper end nozzle of tieback tube 4.Between these external central tube 39 outer walls and can 23 inwalls sealed core group 25 is installed also, is used to form sealing in the pipe.
Like Fig. 1 and shown in Figure 3,, on the same cross section of can 23, have the through hole of four symmetrical distributions in can 23 part that is nested below the part that is threaded with back-off nut 21.Be enclosed within on outer tieback tube 4 inwalls of can 23 corresponding to lead to the hole site and have annular shallow slot 44, safety catch 24 is installed in the through hole of can 23.The radical length of safety catch 24 is greater than the wall thickness of can 23; The one of which end is stuck in the annular shallow slot 44 of tieback tube 4; One end is against on the outer wall of back-off nut 21; Safety catch 24 is fixed in the space that forms between tieback tube 4 inwall annular shallow slots 44, can 23 through holes and back-off nut 21 outer walls, in case non-return extend neck 4 issues the axial displacement of looks for can 23 in the effect of external force thus.The lower surface of the above back-off nut 21 is that it can push an end of safety catch 24 in the annular shallow slot 44 of tieback tube 4 inwalls smoothly after inverted cone surface screwed in can 23 with convenient back-off nut 21.
As shown in Figure 3, the vertical cross-section of the annular shallow slot 44 of the above tieback tube 4 inwall is a trapezium structure, and the longitudinal length of notch is greater than the longitudinal length of bottom land.The vertical cross-section of said safety catch 24 is a rectangular configuration; Its last inferior horn that inserts an end of annular shallow slot 44 is the corresponding chamfering of trapezoidal shape with annular shallow slot 44 vertical cross-sections; So that give up at the running tool back-off, the back-off nut up after; Carry out seat envelope tieback tube when descending safety catch can inwardly radially regain the annular shallow slot that skids off tieback tube inwall smoothly, remove with knot the restriction of tieback tube axial displacement accomplished seat smoothly and sealed.
As shown in Figure 4, the horizontal section of the above safety catch 24 is T font structure: an end that is stuck in tieback tube 4 annular shallow slots 44 is the wide end of T font, and an end that is against on back-off nut 21 outer walls is the narrow end of T font.The through hole horizontal section that is located at accordingly on the can 23 also is T font structure, constitute by wide hole and narrow hole, wide hole and narrow aperture between form a step.The radical length in its wide hole is greater than the radical length of the wide end of safety catch and the spacing sum between can outer wall and tieback tube inwall.In the time of thus in safety catch 24 is fixed on the space that forms between annular shallow slot 44, can 23 through holes and back-off nut 21 outer walls.Leave gap 32 diametrically between the step on the wide end inside wall of safety catch 24 and can 23 in the through hole.When seat seals; Back-off nut 21 is carried on; Under the 4 descending effects of tieback tube; Annular shallow slot 44 on tieback tube 4 inwalls forces safety catch 24 to produce inside radial displacement, and said gap 32 makes safety catch 24 can move radially the constraint of certain displacement end to tieback tube 4, but can not drop in the inner chamber of can 23.
Like Fig. 1 and shown in Figure 2, the outside in seat envelope pipe nipple 6 stage casings is with a big envelope tube 11 in the said running tool.Seat big envelope tube 11 is a tubular structure.Seat big envelope tube 11 epimeres and seat seal between the part that pipe nipple 6 is nested through being threaded, and are provided with sealing.Present big envelope tube 11 hypomeres and the part that seat envelope pipe nipple 6 is nested have three axial bar-shaped troughs that distribute symmetrically and evenly on seat envelope pipe nipple 6 outer walls.Correspond on the seat big envelope tube 11 of bar-shaped trough position and have three axial strip through-holes that distribute symmetrically and evenly, the upper edge of through hole is lower than the bar-shaped trough upper edge, and the lower edge of through hole is higher than the bar-shaped trough lower edge.In the space that through hole surrounded of the bar-shaped trough of said seat envelope pipe nipple 6 and seat big envelope tube 11, a block piece 12 is installed.Seat block piece 12 is up-narrow and down-wide wedge.There is a block piece spring 14 seat block piece 12 bottoms by screw 13 crosswise fixed towards a radial hole that sidewall is provided with of seat envelope pipe nipple 6 in it, are used for flicking a block piece 12.The upper surface of seat block piece 12 is lower than a big envelope tube 11 through hole upper edges, and its lower surface is higher than a big envelope tube 11 through hole lower edges.Seat inboard, block piece 12 upper and lower end face is respectively arranged with upwards and downward convexity, and when seat block piece 12 is flicked, seat block piece 12 ejects seat big envelope tubes 11 through holes, and the convexity on its upper surface and the lower surface is stuck in the big envelope tube 11.
Like Fig. 1 and shown in Figure 2, on above-described seat big envelope tube 11, be with protection fluid cylinder 10.Protection fluid cylinder 10 is a tubular construction, and its epimere is higher than a upper surface of big envelope tube 11 and directly overlaps on the present envelope pipe nipple 6, and is provided with sealing in the part that is nested.On the inwall of partial protection fluid cylinder 10 that is nested, be provided with simultaneously and shrink jump ring 8.Outside the present big envelope tube 11 of hypomere cover of protection fluid cylinder 10; It is fixing through protection fluid cylinder shear pin 10 with the part that is nested of lower part with seat big envelope tube 11 through hole lower edges, thus can be with 12 protections of seat block piece in the cavity that protection fluid cylinder 10 and seat envelope pipe nipple 6 bar-shaped troughs, seat big envelope tube 11 through holes are formed.The outer wall of seat big envelope tube 11 through hole upper edge parts has outside radial protrusion ring, and this protruding ring outer wall is that clearance-type cooperates with the inwall of protection fluid cylinder 10 hypomeres, and is provided with sealing.The outer wall that removes the above seat big envelope tube 11 of this part comprises its upper surface with leaving the space between the inwall of protecting fluid cylinder 10, i.e. seat big envelope tube 11 different protection fluid cylinder 10 contacts of this part.Seat big envelope tube 11 through hole upper edges are with top and the inwall of protecting fluid cylinder 10 and corresponding seat envelope pipe nipple 6 outer walls formation cavity 42 thus; Be provided with pressure transmission hole 9 with cavity 42 corresponding seat envelope pipe nipples 6; This pressure transmission hole 9 is a through hole, when building the pressure, can the fluid pressure that seat seals pipe nipple 6 inner chambers be delivered in the cavity 42.Under the effect of pressure; Cut off protection fluid cylinder shear pin 15; Protection fluid cylinder 10 is up, does not limit the position that a block piece 12 ejects fully when protection fluid cylinder 10 goes upward to, and on the outer wall of this position corresponding to seat envelope pipe nipple 6, is provided with jump ring groove 7 in advance; The contraction jump ring 8 that is provided with on the protection fluid cylinder 10 epimere inwalls snaps in the jump ring groove 7, axially the moving up and down of limiting protecting fluid cylinder 10.Seat big envelope tube 11 is ejected in the effect of seat block this moment piece 12 present block piece springs 14 down.
The operating principle of present embodiment seat sealing mechanism is following:
As shown in Figure 2: protection fluid cylinder 10 is on the present big envelope tube 11 of cover, and through on the shear pin 15 fixing present big envelope tubes 11, in the present big envelope tube 11 of seat block piece 12 protections.The effect of protection fluid cylinder is at first, to have prevented that impurity such as sand setting or landwaste from entering into the ejection of influence seat block piece 12 in the big envelope tube 11; Secondly, prevent the scuffing of 12 pairs of tieback tube 4 inner surfaces of a block piece; Once more, in conjunction with the effect of compression spring 14, in the present big envelope tube 11 of stop limits; Submit on after the running tool back-off is given up and judge into instrument and to give up when separating; Increased running tool on carry judging distance, even because seat block piece 12 parts are proposed tieback tube 4, a seat block piece 12 can freely not flick yet; Cause the running tool can't replaced, see Fig. 5.
Like Fig. 7 and shown in Figure 3 after judging that the running tool back-off is given up, building the pressure makes hydraulic coupling enter in the cavity 42 of protection fluid cylinder 10, under the effect of pressure through pressure transmission hole 9; Cut off shear pin 15; Protection fluid cylinder 10 is up, when contraction jump ring 8 is up to jump ring groove 7 with protection fluid cylinder 10, shrinks jump ring 8 and is retracted in the jump ring groove 7; Limit the effect of protecting the axial upper and lower mobile of fluid cylinder 10, the piece of seat block at this moment 12 just can carry spring 14 and ejected a big envelope down.
Like Fig. 1, Fig. 3, shown in Figure 4: running tool also not with can 23 give up break away from before; Be that back-off nut 21 is when also meshing together through left hand thread 22 with can 23; Safety catch 24 is fixed in the space that the cannelure 44 by back-off nut 21, can 23 and tieback tube 4 inner surfaces forms; And because the restriction of back-off nut 21 bottoms, the safety catch 24 of this moment can't produce radial displacement entad; If tieback tube 4 issues the axial displacement of looks for can 23 in the effect of external force, all can be by safety catch 24 restrictions.So just prevented when running tool is sent into the tail pipe string in the well design attitude, to take place because tieback tube 4 receives downward power to shift to an earlier date the accident of base sealed packer.
Like Fig. 5, Fig. 6, shown in Figure 7, after cementing finished, with carrying on the running tool, the seat block piece of having opened protection fluid cylinder 10 proposed tieback tube 4 for 12 groups.Back-off nut 21 has been given up with can 23 and has been separated at this moment, can't limit moving radially of safety catch 24.Like Fig. 9, Figure 10, shown in Figure 11, transmit from through being threaded in the downforce of sending into drilling tool on the lifting sub 1 through the seat block piece 12 on the running tool, act on the tieback tube 4, cause tieback tube 4 descending with respect to can 23.Visible in Fig. 4, the gap 32 in the wide end inside wall of safety catch 24 and the through hole on the can 23 between the step allows safety catch 24 radially to move inward certain displacement at this moment and can not drop in can 23 endoporus.Under the 4 descending effects of tieback tube, the cannelure 44 on the inner surface of tieback tube 4 forces safety catch 24 to produce inside radial displacement, the constraint of 24 pairs of tieback tubes 4 of termination of security block like this; Continue to press down tieback tube 4 and drive the seat big envelopes 29 descending packer shear pins 28 of cutting off, force packing element 30 to expand, come the annular space between packing packer body 31 and the outer layer sleeve 45, seal to accomplish seat with this by the lower surface 40 of seat big envelope 29.
The whole workflow of seat sealing mechanism of the present invention is: running tool is connected with can 23 through back-off nut 21; And can 23 and tieback tube 4 are connected as a single entity through safety catch 24; Do not have axially-movable each other; Both made to be lowered in the process to be hampered, and also can not cause the envelope of seat in advance of packer because of the put-on and delegated of sending into drilling tool at tail pipe; Present extension finish and guarantee the seat hang successfully after; Drive button nuts 21 positive revolution circles through back-off lower contact 20 and carry out back-off, on carry certain distance and judge and give up because the protection of protecting fluid cylinder 10 is arranged; A block piece 12 was positioned at beyond tieback tube 4 tops, also can caused seat envelope in advance; After guaranteeing the back-off success, running tool is transferred to original position, add hydraulic pressure and cut off protection fluid cylinder shear pin 15, protection fluid cylinder 10 goes upward to jump ring groove 7 positions, gets out of the way a block piece 12, makes it under spring 14 effects, touch tieback tube 4 inwalls; Continue to build the pressure to the ball seat shear pin and cut off, set up circulation, C.I.P, on submit into instrument and make a block piece 12 be positioned at tieback tube 4 tops, seat block this moment piece 12 complete spreadings are transferred running tool to tonnage necessarily, can realize packer set.
Claims (7)
1. a seat sealing mechanism that is used for packing formula extension hanger comprises running tool, can [23], tieback tube [4] and packer;
Said tieback tube [4] is enclosed within can [23] outside, and said running tool inserts in the tieback tube [4], and running tool connects through back-off nut [21] outer wall top in the back-off releasing gadget and the left hand thread [22] between can [23] upper inside wall; Said packer comprises packer body [31] and cover seat big envelope [29] in the middle, fixes with shear pin between the two; The lower end of can [23] is inserted and being threaded in the upper end of said packer body [31], and is provided with sealing; The lower end that tieback tube [4] is inserted in the upper end of the seat big envelope [29] that is overlapping on the packer body [31], and to be threaded;
The outside in seat envelope pipe nipple [6] stage casing is with a big envelope tube [11] in the said running tool; Present big envelope tube [11] seals the part that pipe nipple [6] is nested with seat; On seat envelope pipe nipple [6] outer wall, have some axial bar-shaped troughs, correspond on the seat big envelope tube [11] of bar-shaped trough position and have axial strip through-hole; The seat block piece [12] that can be ejected by spring is installed in the space that through hole surrounded of the bar-shaped trough of said seat envelope pipe nipple [6] and seat big envelope tube [11], transmits the downforce that tieback tube [4] is applied when being used for present envelope, to realize the seat envelope;
It is characterized in that: the part that is nested can [23] is threaded partly with back-off nut [21] below; On the same cross section of can [23], have some through holes; Be enclosed within on outer tieback tube [4] inwall of can [23] corresponding to lead to the hole site and have annular shallow slot [44]; Safety catch [24] is installed in the through hole of can [23]; The radical length of safety catch [24] is greater than the wall thickness of can [23], and the one of which end is stuck in the annular shallow slot [44] of tieback tube [4], and an end is against on the outer wall of back-off nut [21]; Safety catch [24] is fixed in the space that forms between tieback tube [4] inwall annular shallow slot [44], can [23] through hole and back-off nut [21] outer wall thus, in case non-return extend neck [4] issues the axial displacement of looks for can [23] in the effect of external force; The vertical cross-section of the annular shallow slot [44] of said tieback tube [4] inwall is a trapezium structure, and the longitudinal length of notch is greater than the longitudinal length of bottom land; The vertical cross-section of said safety catch [24] is a rectangular configuration, and its last inferior horn that inserts an end of annular shallow slot [44] is the corresponding chamfering of trapezoidal shape with annular shallow slot [44] vertical cross-section.
2. seat sealing mechanism according to claim 1, the lower surface that it is characterized in that back-off nut [21] are that it can push an end of safety catch [24] annular shallow slot [44] of tieback tube [4] inwall smoothly after inverted cone surface screwed in can [23] with convenient back-off nut [21].
3. seat sealing mechanism according to claim 1; The horizontal section that it is characterized in that said safety catch [24] is T font structure; An end that is stuck in tieback tube [4] annular shallow slot [44] is the wide end of T font, and an end that is against on back-off nut [21] outer wall is the narrow end of T font; The through hole horizontal section that is located at accordingly on the can [23] also is T font structure; Constitute by wide hole and narrow hole; Wide hole and narrow aperture between form a step, the radical length in its wide hole is more than or equal to the radical length of the wide end of safety catch [24] and the spacing sum between can [23] outer wall and tieback tube [4] inwall; In the time of thus in safety catch [24] is fixed on the space that forms between annular shallow slot [44], can [23] through hole and back-off nut [21] outer wall; Go up between the step in the through hole at the wide end inside wall of safety catch [24] and can [23] and to leave gap [32] diametrically; When seat seals; Back-off nut [21] is carried on, and under the descending effect of tieback tube [4], the annular shallow slot [44] on tieback tube [4] inwall forces safety catch [24] to produce radial displacement; Said gap [32] makes safety catch [24] can inwardly move radially the constraint of certain displacement end to tieback tube [4], but can not drop in the inner chamber of can [23].
4. according to the described seat of each of claim 1～3 sealing mechanism; It is characterized in that on the seat big envelope tube [11] of the above running tool, being with protection fluid cylinder [10]: protection fluid cylinder [10] is a tubular construction; Its epimere is higher than a upper surface of big envelope tube [11] and directly overlaps on the present envelope pipe nipple [6]; And be provided with sealing in the part that is nested, on the inwall of partial protection fluid cylinder [10] that is nested, be provided with simultaneously and shrink jump ring [8]; Outside the present big envelope tube [11] of hypomere cover of protection fluid cylinder [10]; It is fixed through shear pin [15] with the part that is nested of lower part with big envelope tube [a 11] through hole lower edge, is protecting fluid cylinder [10] and seat to seal in the cavity of pipe nipple [a 6] bar-shaped trough, seat big envelope tube [11] through hole composition seat block piece [12] protection thus; The outer wall of seat big envelope tube [11] through hole upper edge part has outside radial protrusion ring; This protruding ring outer wall is that clearance-type cooperates with the inwall of protection fluid cylinder [10] hypomere, and is provided with sealing, leaves the space between outer wall and the upper surface inwall with protection fluid cylinder [10] except that the above seat big envelope tube [11] of this part; Seat big envelope tube [11] through hole upper edge constitutes cavity [42] with top and an inwall of protecting fluid cylinder [10] and seat envelope pipe nipple [a 6] outer wall thus; Be provided with pressure transmission hole [9] with the corresponding seat envelope pipe nipple of cavity [42] [6], this pressure transmission hole [9] is a through hole, and the hydraulic pressure transfer that when building the pressure, can seat be sealed pipe nipple [6] inner chamber is in cavity [42]; Under the effect of pressure; Cut off shear pin [15], protection fluid cylinder [10] is up, when protection fluid cylinder [10] goes upward to the position of not limiting block piece [a 12] ejection fully; Seal corresponding to seat in this position on the outer wall of pipe nipple [6] and be provided with jump ring groove [7] in advance; The contraction jump ring [8] that is provided with on protection fluid cylinder [10] the epimere inwall snaps in the jump ring groove [7], axially the moving up and down of limiting protecting fluid cylinder [10], and seat block piece this moment [12] ejects a big envelope tube [11] under the effect of spring [14].
5. seat sealing mechanism according to claim 4, the bar-shaped trough that it is characterized in that having on the outer wall at seat envelope pipe nipple [6] middle part in the said running tool is for evenly distributing.
6. seat sealing mechanism according to claim 4 is characterized in that being with cock cap [3] on the lifting sub [1] in the said running tool, is fastened on the lifting sub [1] through hold-down screw [2]; In said running tool insertion tieback tube [4], after the left hand thread [22] between said back-off nut [21] outer wall top and can [23] upper inside wall connected, cock cap [3] was stuck in the upper end nozzle of tieback tube [4], covers the upper end nozzle of tieback tube [4].
7. seat according to claim 4 sealing mechanism is characterized in that between central tube [39] outer wall and can [23] inwall in said running tool sealed core group [25] being installed, and is used to form in the pipe to seal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100062182A CN101503952B (en) | 2008-02-04 | 2008-02-04 | Seat seal mechanism used for packing type tail pipe hanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100062182A CN101503952B (en) | 2008-02-04 | 2008-02-04 | Seat seal mechanism used for packing type tail pipe hanger |
Publications (2)
| Publication Number | Publication Date |
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| CN101503952A CN101503952A (en) | 2009-08-12 |
| CN101503952B true CN101503952B (en) | 2012-05-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100062182A Active CN101503952B (en) | 2008-02-04 | 2008-02-04 | Seat seal mechanism used for packing type tail pipe hanger |
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| CN (1) | CN101503952B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103015930B (en) * | 2012-12-11 | 2015-08-19 | 中国石油集团川庆钻探工程有限公司 | Multilevel heavy-load rotary liner hanger |
| CN103470210B (en) * | 2013-09-17 | 2016-01-13 | 中国石油集团西部钻探工程有限公司 | The anti-set packer of blocking piece type |
| CN103726803B (en) * | 2013-12-20 | 2016-07-20 | 安东石油技术（集团）有限公司 | Oil/gas Well extension hanger preventer |
| CN107906299B (en) * | 2017-11-15 | 2019-06-25 | 西华大学 | A kind of pipeline inside capping tools |
| CN111852368A (en) * | 2019-04-30 | 2020-10-30 | 中国石油化工股份有限公司 | Setting device and pipe string comprising same |
| CN114484115A (en) * | 2022-03-01 | 2022-05-13 | 广西玉柴机器股份有限公司 | Direction-adjustable rotary joint and method |
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| US6318472B1 (en) * | 1999-05-28 | 2001-11-20 | Halliburton Energy Services, Inc. | Hydraulic set liner hanger setting mechanism and method |
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| US6318472B1 (en) * | 1999-05-28 | 2001-11-20 | Halliburton Energy Services, Inc. | Hydraulic set liner hanger setting mechanism and method |
| CN2898269Y (en) * | 2006-04-26 | 2007-05-09 | 中国石油天然气股份有限公司 | Multifunctional sieve-tube hanger |
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