US1739932A - Inside casing cutter - Google Patents

Description

I l9Z9.' EVE-NTRESCA 1,739,932"- INS IDE CASING CUTTER Original Filed-My 18, 1925 Patent Dec, 17, 1929 u STATES ERCOLE VENTRESCA, OF HOUSTON, TEXAS INSIDE CASING CUTTER Application filed May 18, 1925, Serial No. 31,005. Renewed August 8, 1927.

The present invention relates, to a casing cutter, such as would be useful in wells,'and has for its principal object to provide a structure which may be efliciently operated for cutting thecasing from the inside, as is frequently most desirable.

Another important object of the invention is to provide a cutter of this nature, which may be operated by air or water, and has a structure whereby the air and water will be fed to the cutter to form a cooling medium which will also wash away the cuttings.

A still further object of the invention is to provide a cutter of this nature, which is exceedingly simple in construction, strong,

durable, easy to manipulate, efficient and reliable in operation, not likely to easily become out of order, and otherwise well adapted for the purpose for which. it is designed.

With the above and numerous other objects in view, asv will appear as the description proceeds, the invention resides in certain novel features of construction, and in the combination and arrangement of parts, as will be hereinafter more fully described and claimed.

-In the drawing:

Figure 1 is a longitudinal section through the cutter.

Figure 2 is a transverse section therethrough, taken substantiallyon the line 2- 2 of Figure 1, and

Figure 3 is a longitudinal section through the spring.

Referring tothe drawing in detail, it will be seen that 1 designates the cylindrical body of the cutter which has, at its bottom end, an internally threaded extension 2, for receiving a plug 3. A conical shaped spring memher 4 has an annular flange 5 on its lower end which engages between the end of the body 1 and the plug 3, so that the spring will be disposed longitudinally through the body. This spring member 4 has downwardly tapered slits 7 formed therein, to provide spring arms 8, the upper extremities of which are slotted longitudinally'as at 9. The exter nal diameter of the cylindrical body 1 is slightly enlarged, as at 10, and has flattened faces 11 formed thereon, with openings 12 exof the rod, the same is reduced to provide'a tending inwardly therefrom and radiating from the axis of the body. .Ot-her openings 13 extend through the body in substantially the same plane with the openings 12 and are diametrically opposed to each other and are.

' so disposed that a linedrawn through the center of the opening 13 would be at right angles to a line drawn through the center of the openings 12. Holders 14 and 15 are disposed in the openings 12 and 13 respectively, and have extending from their inner ends T- shaped projections 16, which are receivable in the slots 9, as is indicated to advantage in Figures 1 and 2 and the arms 8 of the spring member 4 are so tensioned as to relieve the 5 holders 14 and 15,inwardly of their respective openings 12 and 13. The holders 14 receive cutters 17 while the holders 15 receive rollers 18, which are journaled therein in any suitable manner.

A tube 20 is threadably engaged-with the upper end of the cylindrical body 1, as at 21, and the interior thereof is formed with an annular shoulder 22, adjacent the connection 21. A plunger 23 is provided with openings 24 therein, and also with suitable packing 25. A rod 26 has its upper end reduced to pierce the plunger 23, being held in engagement therewith by nuts 27. Intermediate the ends conic-a1 wedge portion 27, which terminates in the guide extension 28, normally disposed between the heads of the .T-shaped extensions 16. v A spring 29 is disposed about the rod 26, having one endin engagement with the plunger 23, and'the other end in engagement with a shoulder 30, formed at the upper end of the cylindrical body 1 and normally holds the plunger ofi of the seat 22 and the wedge 27 out of engagement with the extensions 16.

From the description as it has thus far progrossed, it will be seen that if air or water is forced into the uper portion of the tube 20,

the plunger 23 will be moved downwardly,

thereby pushing downwardly on the rod 26,

and when the wedge shaped portion 27 engages the heads of the T-shaped extension 16, the holders 14 and 15 will be pushed outwardly, so that upon rotation of the tube and cylindrical body, the cutters will engage the ing upon the lunger 23, there will be slight to use one cutter 17 only and no rollers.

in the plunger until the escape of sai fluid through the openings 24 plunger has moved downwardly to contact with the shoulder 22. When this occurs the flow of fluid through the openings will be cut oil, and the fact will be indicated at once by its action upon the pumps at the surface; thus, showing theoperator that the cutting operation has been finished and the cutters fully extended. The rollers 18 will act as guides and prevent chatterin When t e plunger is no longer being forced downwardly, the spring 29 will raise it and the stem 26 so that the sprin 4 may return the holders 14' and 15 inwar 1y of their respective openings 12 and 13. To remove the holders it is only necessary to remove the plunger 3 and Jthe spring 14 will drop out through the bottom end of the body 1 thereby disengaging the slotted end 9 of the arms 8 fromthe T-shaped extensions on the holders.

It will be apparent that difl'erentarrangements may be provided in the cutters 17 and 18 and at times some of these elements may be left out. The number of theelements, therefore may be increased or decreased, as may be found desirable. In constructing the cutters in small sizes, it would be preferable will thus be apparent that numerous other changes in the details of construction, and in .the combination and arrangement of partsmay be resorted to, without departing from the spirit or scope of the'invention as hereinafter claimed, or sacrificing any of its advantages.

Having thus described I claim as new is:

I 1. An inside casing cutter including, in combination, a bod having radially disposed openings, holders in the openings, T-shaped extensions onthe inner ends of theholders, a cone-shaped spring member in the body hav- .ing longitudinally extending slits .starting from its apex and terminating a distance from its base end soas to form a plurality of spring arms'having slots in theirupper ends for receiving'said T-shaped extensions and normally retaining the holders inwardly of the body, and means for spreading the arms and movingthe holders outwardly of thebody.

2. An inside casing cutter including, in

- combination, a body having radially disposed openings, holders in the openi ,T-shaped its base end seas to form a p urality of spring arms ha v slots in their 'upperends' for rece1v1ng sai T-shaped extens ons and normal- 3 l f v h close said openings w en said plunger is desaid cutters, a fluid p ly retaining the holders inwardly of the body, means for spreading the arms and moving the holders outwardly of the body, said. spring member being provided with an outwardly projecting flange at its bottom end, said body having a shoulder, and a plug threaded in the end of the body for holding said flange against .said shoulder.

3.; A pipe. cutter comprising a tubular body having a fluid passage therethrough, cutters movable laterally from said body, a member co-operating with said cutters to .move the same, a plunger on sa1d member, a spring on said member between said plunger and said.

- ters adapted to move radially froinjsai body,

a member above said cutters and adapted to be moved downwardly betwen said cutters to expand said cutters outwardly, a plunger on said member, a spring on said member above said-cutters, and acting to holdsaid plunger normally raised, there being a fluid passage through said body, and means to close sa1d passage when said plunger is depressed tocompletely expand said cutters.

5. A pipe cutter comprising a bod cutters adapted to move laterally from said body, an expanding member above said cutters and adapted to be moved downwardly between said cutters to expand said cutters outwardly,

a plunger on said member, said plunger having openings therein, means to hold, sa1d plunger resiliently u ward, and means to pressed to completely expand said cutters. 6. A pipe cutter including a body having a fluid passage therethrough, cutters therein,

a member shaped to on age andrmove said cutters outwardly, flui pressure operated means on said-member, a shoulder on saidbody above said cutters, said means bein adapted to engage said shoulder, when sai means is depressed to expand said cutters and to close 01fv the passage of fluid, and resilient means engaging said fluid pressure operated means to hold said member normally raised.

7. YA casing-cutter comprising in combination a body member, extensible cutters carried by said, body, a plunger for o eratingsaid cutters, a fluid passage throu h. said body member, and 06-0 erating means carried by said body and sai plunger to close said passage when 'said plunger has extended said cutters.

8; A casing cutter comprising in combination a body member, exte'nsible'cutterscarried by said body, a

- z roughsaidbedy 115:; for operating member, and co-operating means carried by said body and said plunger to close said passage when said cutters are fully extended, said co-operating means being above said cutters.

9. A device of the character described in-.

cluding a body member, cutters adapted to gefrojected and withdrawn radially of said 0 means slidable in said body to actuate said cutters, a piston carried by said means, a fluid passage thru said body member and said piston, and additional means formed on said body adapted to contact said piston to completely stop the flow of fluid thru said passage when said piston has extended said cutters.

10. A device of the character described includinga body member, cutters adapted to be rojected and withdrawn radially of said ody, means slidable in said body to actuate said cutters, a piston carried by said means,

a fluid passage thru said body and said piston,

additional means adapted to contact said piston to completely shut ofi' the flow of fluid thru said passage when the said piston has extended said cutters and a spring normally tending to separate said piston and said additional means.

In testimony whereof I aflix my signature.

7 ERCOLE VENTRESCA.

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