US20080080991A1 - Electrical submersible pump - Google Patents
Electrical submersible pump Download PDFInfo
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- US20080080991A1 US20080080991A1 US11/536,294 US53629406A US2008080991A1 US 20080080991 A1 US20080080991 A1 US 20080080991A1 US 53629406 A US53629406 A US 53629406A US 2008080991 A1 US2008080991 A1 US 2008080991A1
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- fluid
- pump
- pump assembly
- reciprocating
- motor
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F9/00—Diffusion pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
- E21B43/128—Adaptation of pump systems with down-hole electric drives
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/08—Machines, pumps, or pumping installations having flexible working members having tubular flexible members
- F04B43/10—Pumps having fluid drive
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B47/00—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps
- F04B47/06—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps having motor-pump units situated at great depth
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B47/00—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps
- F04B47/06—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps having motor-pump units situated at great depth
- F04B47/08—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps having motor-pump units situated at great depth the motors being actuated by fluid
Definitions
- FIG. 1 is a schematic of an embodiment of an electrical submersible pump disposed in a wellbore below a subsurface safety valve.
- FIG. 5 is another embodiment of a pump assembly.
Abstract
A method and apparatus for lifting fluids from a well is provided. In one embodiment, a pump assembly comprises a rotary motor adapted to actuate a reciprocating pump. The motor shaft of the rotary motor is threadedly coupled to a drive member of the reciprocating pump. In operation, rotation of the rotary motor causes reciprocation of the reciprocating pump.
Description
- 1. Field of the Invention
- Embodiments of the present invention generally relate to a pumping apparatus for transporting fluids from a well formation to the earth's surface. Particularly, embodiments of the present invention relate to an electrical submersible pump assembly having a positive displacement pump driven by a rotary motor. More particularly, embodiments of the present invention relate to a pump assembly having a rotary motor capable of rotating in two directions.
- 2. Description of the Related Art
- Many hydrocarbon wells are unable to produce at commercially viable levels without assistance in lifting formation fluids to the earth's surface. In some instances, high fluid viscosity inhibits fluid flow to the surface. More commonly, formation pressure is inadequate to drive fluids upward in the wellbore. In the case of deeper wells, extraordinary hydrostatic head acts downwardly against the formation, thereby inhibiting the unassisted flow of production fluid to the surface.
- In wells that produce natural gas, liquids are often carried with the gas into the well bore. These liquids accumulate in the well bore and fill the well casing. The rise of the liquid level in the casing leads to a pressure increase of the liquid in the casing, which may shut off the flow of gas unless the liquid is removed.
- A common approach for urging production fluids to the surface includes the use of a mechanically actuated, positive displacement pump. Mechanically actuated pumps are sometimes referred to as “sucker rod” pumps. The reason is that reciprocal movement of the pump necessary for positive displacement is induced through reciprocal movement of a string of sucker rods above the pump from the surface.
- A sucker rod pumping installation consists of a positive displacement pump disposed within the lower portion of the production tubing. The installation includes a piston which is moved in linear translation within the tubing by means of steel or fiberglass sucker rods. Linear movement of the sucker rods is typically imparted from the surface by a rocker-type structure. The rocker-type structure serves to-alternately raise and lower the sucker rods, thereby imparting reciprocating movement to the piston within the pump downhole.
- Other methods are currently used to remove the water from the casing. These methods include use of chemical foams, progressive cavity pumps (“PCP”), conventional Electric Submersible Pumps (“ESP”), and other forms of artificial lift. Conventional ESPs pump the fluid by imparting centrifugal force on the fluid. The lift H provided by a centrifugal pump is a square function of the ratio of the diameter D, i.e., H2=H1(D2/D1)2. Thus, a smaller diameter pump will require more stages to lift the fluid at the same rate from the same depth.
- Many existing gas fields are completed with small diameter tubing in the gas producing zone where the water accumulates. The completion requires a small diameter to be installed in this section of the casing to remove the liquid. In these applications, the pump diameter is often restricted to a 2 inch diameter. In comparison, the smallest traditional ESP has a 3.35 inch diameter. Thus, a 2 inch diameter ESP would require many more stages to lift the fluid in the oil well.
- To overcome the limitations of a centrifugal pump driven by an electric motor, efforts have been made to develop a linear electric motor for use downhole to drive a positive displacement pump. Positive displacement pump are more efficient in lifting fluids from high depths in small diameter pipes than centrifugal pumps. One example of a linear motor is disclosed in U.S. Pat. No. 5,252,043, issued to Bolding, et al., entitled “Linear Motor-Pump Assembly and Method of Using Same.” Other examples include U.S. Pat. No. 4,687,054, issued in 1987 to Russell, et al. entitled “Linear Electric Motor For Downhole Use,” and U.S. Pat. No. 5,620,048, issued in 1997, and entitled “Oil-Well Installation Fitted With A Bottom-Well Electric Pump.” In these examples, the pump includes a linear electric motor having a series of windings which act upon an armature. The pump is powered by an electric cable extending from the surface to the bottom of the well, and residing in the annular space between the tubing and the casing. The power supply generates a magnetic field within the coils which, in turn, imparts an oscillating field upon the armature. In the case of a linear electric motor, the armature is translated in an up-and-down fashion within the well. The armature, in turn, imparts translational movement to the pump piston residing below the motor. The piston enables a positive displacement pump to displace fluids up the wellbore and to the surface with each stroke of the piston.
- Submersible pump assemblies which utilize a linear electric motor face many challenges during their employment. A first problem relates to the introduction of the submersible pump into the wellbore. As noted, wellbores tend to have inherent deviations. At the same time, submersible pumps can be of such a length that it becomes difficult for the pump to negotiate turns and bends within the tubing string of the well. The length of a linear submersible pump is generally proportional to the horsepower desired to be generated by the pump assembly. Greater horsepower would be needed for deeper wells in order to overcome the prevailing hydrostatic head. This, in turn, would require a greater length or number of windings within the stator and corresponding armature.
- Another problem inherent in current submersible pump designs pertains to the restricted diameter for fluid flow within the motor section. In linear submersible pump designs, the motor portion of the pump is configured above the piston and sucker rod pump portion. The result is that fluid being displaced by the pump must travel through restrictive fluid ports which reside within the armature portion of the motor en route to the surface. Typically, the inner diameter of the production string defines an already narrow path of flow through which production fluids must travel. Positioning a linear electric motor within the tubing creates a further restriction for fluid movement.
- There is a need, therefore, for an improved submersible electrical pump. There is also a need for an electrical submersible pump operated by a rotary motor.
- In one embodiment, a pump assembly comprises a rotary motor adapted to actuate a reciprocating pump. The rotary motor is coupled to the reciprocating pump using a ball screw type connection. In operation, rotation of the rotary motor causes a reciprocating action of the reciprocating pump.
- In another embodiment, the rotary motor comprises a permanent magnet motor. The rotary motor is adapted to rotate in two different directions, thereby causing the reciprocating action of the reciprocating pump. In another embodiment still, the reciprocating pump comprises a positive displacement pump.
- In another embodiment, a method of lifting fluids from a wellbore comprises providing a pump assembly having a reciprocating pump actuated by a rotary motor; positioning the pump assembly in the wellbore; operating the rotary motor to actuate the reciprocating pump; and lifting fluids from the wellbore.
- In another embodiment still, the reciprocating pump includes a drive member threadedly coupled to a motor shaft of the rotary motor. In operation, rotation of the motor shaft causes the drive member to move along the motor shaft. In yet another embodiment, the rotary motor is cycled between two rotational directions to drive the reciprocating action of the pump.
- In another embodiment still, a pump assembly comprising a rotary motor is disposed below a subsurface safety valve. Preferably, the rotary motor is capable of rotating in two directions. More preferably, the rotary motor comprises a permanent magnet motor.
- In another embodiment still, a pump assembly comprises a pump adapted to pump a fluid between at least two fluid cavities and a rotary motor adapted to actuate the pump, wherein a direction of fluid flow between the at least two fluid cavities is reversed by changing a rotational direction of the rotary motor. In yet another embodiment, each of the fluid cavities is expandable. In yet another embodiment, expansion or retraction of the fluid cavity controls movement of a pumped fluid in the chamber.
- In another embodiment still, a method of lifting fluids from a wellbore, comprises providing a pump assembly having a rotary motor and a fluid chamber; rotating the rotary motor in a first direction to introduce fluid into the fluid chamber; rotating the rotary motor in a second direction to discharge fluid from the fluid chamber; and lifting the discharge fluid from the wellbore. In yet another embodiment, the pump assembly comprises a second fluid chamber, wherein the second fluid chamber is discharging fluid while fluid chamber is accumulating fluid. In yet another embodiment, the method further comprises discharging fluid from a second chamber while the fluid is being introduced into the fluid chamber. In yet another embodiment, the method further comprises expanding an expandable member in the fluid chamber while fluid is being discharged from the fluid chamber. In yet another embodiment, the method further comprises retracting an expandable member in the fluid chamber while fluid is being introduced into the fluid chamber.
- So that the manner in which the above recited features of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings illustrate only typical embodiments of this invention and are therefore not to be considered limiting of its scope, for the invention may admit to other equally effective embodiments.
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FIG. 1 is a schematic of an embodiment of an electrical submersible pump disposed in a wellbore below a subsurface safety valve. -
FIG. 2 is a partial cross-section view of the pump ofFIG. 1 . -
FIG. 2A is a partial cross-section view of another embodiment of a pump. -
FIG. 3 is another embodiment of a check valve assembly used with an electrical submersible pump assembly. -
FIG. 4 is yet another embodiment of an electrical submersible pump assembly. This embodiment features a double acting pumping mechanism. One pump positioned below the electric motor and one pump positioned above electric motor. -
FIG. 5 is another embodiment of a pump assembly. -
FIG. 6 is yet another embodiment of a pump assembly. - A method and apparatus for lifting fluids from a well is provided. In one embodiment, a pump assembly comprises a rotary motor adapted to actuate a reciprocating pump. The motor shaft of the rotary motor is coupled to a drive member of the reciprocating pump. In operation, rotation of the rotary motor causes reciprocation of the reciprocating pump.
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FIG. 1 is a partial cross-section view of awellbore 10. Acasing 15 is fixed in thewellbore 10 by cured cement. Thecasing 10 is perforated to allow the inflow of formation fluids. A string ofproduction tubing 20 extends from the surface to asubsurface safety valve 170. Theproduction tubing 20 then extends below thesubsurface safety valve 170 to the production zone. Theproduction tubing 20 includes an electricalsubmersible pump 100 disposed at its lower end. Thepump 100 is being reciprocated by a submersible, rotaryelectrical motor 110. Preferably, themotor 110 is disposed below thepump 100 so that formation fluids may be discharged directly into theproduction tubing 20. Apower cable 175 extends from the surface to provide power to themotor 110. -
FIG. 2 is a partial cross-section view of thewellbore 10. In this view, an embodiment of the electricalsubmersible pump 100 is shown in greater detail. Thepump 100 is operated by arotary motor 110. Preferably, therotary motor 110 is a permanent magnet electric motor. An exemplary permanent magnet electric motor suitable for use with thepump 100 is disclosed in U.S. Pat. No. 5,923,111 issued to Eno, et al., which patent is herein incorporated by reference in its entirety. Other suitable rotary motors known to a person of ordinary skill are also contemplated. - A
motor seal 115 may be used to couple themotor 110 to thepump 100. Themotor seal 115 allows for oil expansion as thepump 100 is reciprocated. Preferably, themotor seal 115 is a barrier type seal having a metal bellow or an elastomeric diaphragm or bag. Other suitable motor seals known to a person of ordinary skill are also contemplated. - In one embodiment, the
pump 100 includes ahousing 112 having one ormore ports 113 for fluid communication with thewellbore 10. Anexpandable member 120 in thehousing 112 fluidly seals off aninterior portion 111 of thepump 100 from the wellbore fluids. Suitable expandable members include a diaphragm and a bellow. - The
expandable member 120 is retracted or expanded using a ball screw type coupling with themotor shaft 125 of themotor 110. As shown inFIG. 2 , adrive member 130, such as a nut, is threadedly connected to themotor shaft 125. One ormore extension members 132 connect thenut 130 to aplate 122 of theexpandable member 120. In this respect, rotation of themotor shaft 125 drives thenut 130 to move axially along themotor shaft 125. In turn, theextension members 132 transfer the movement to theplate 122, thereby causing extension or retraction of theexpandable member 120, also referred to as reciprocation. Thenut 130 may include a guide member such as acentralizer 135 to facilitate its movement along themotor shaft 125. In one embodiment, thecentralizer 135 may be guided in the wall of thehousing 112. In this respect, thecentralizer 135 will ensure axial movement of thenut 130 relative to themotor shaft 125 as themotor shaft 125 is rotated. Theinterior portion 111 of thepump 100 may be filled with oil to provide a clean oil operating environment for thedrive member 130. The oil volume in theinterior portion 111 changes as theplate 122 moves linearly. The change in the oil volume is compensated by themotor seal 115. In another embodiment, the change in oil volume may be compensated by a second expandable member coupled to themotor 110, thereby allowing thepump 100 to operate without the need of themotor seal 115. - A reciprocating
member 140 connected to theplate 122 extends from theplate 122 and into an upper portion of thehousing 112. The reciprocatingmember 140 includes anarm portion 143 and avalve portion 142. Thevalve portion 142, also known as the traveling valve, is adapted to selectively control the flow of wellbore fluids into and out of thefluid chamber 145. Thefluid chamber 145 is defined by the travelingvalve 142, a standingvalve 150 and thehousing 112. Each of the travelingvalve 142 and the standingvalve 150 includes a seat for mating with aseal member valve 142 is adapted to allow inflow to thefluid chamber 145, while the standingvalve 150 is adapted to allow outflow from thefluid chamber 145. Thearm portion 143 is adapted and arranged to maintain the travelingvalve 142 above theports 113 such that during the downstroke, wellbore fluids entering theports 113 may flow through the travelingvalve 142 and into thefluid chamber 145. - In operation, the
pump 100 acts as a reciprocating positive displacement pump to deliver wellbore fluids to the surface. As shown inFIG. 2 , thepump 100 is in the beginning of its downstroke. Initially, themotor 110 is rotated to cause thenut 130 to travel toward themotor 110. In this respect, rotary motion of themotor 110 is translated into reciprocating motion of thepump 100. Movement of thenut 130 also urges theplate 122 toward themotor 110, thereby retracting thediaphragm 120. Fluid such as oil in thediaphragm 120 is received by themotor seal 115. - The
nut 130 also imparts a downstroke to thereciprocating arm 140, thereby increasing the size of thefluid chamber 145. As thefluid chamber 145 is increased, the pressure in thefluid chamber 145 decreases. As the pressure decreases, the pressure differential between the inside and the outside of thefluid chamber 145 increases, thereby creating a vacuum like effect inside thefluid chamber 145. The strength of the vacuum is dependent on the length of travel of the travelingvalve 141. The downstroke of thereciprocating arm 140 creates a vacuum sufficient to cause theball 141 of the travelingvalve 142 to unseat so that wellbore fluids are drawn upward into thefluid chamber 145. During this time period, the standingvalve 151 preferably remains closed. - After the
fluid chamber 145 is filled sufficiently with wellbore fluids, themotor 110 is rotated in the opposite direction to begin the upstroke of thepump 100. The opposite rotation causes thenut 130 to reverse directions and move away from themotor 110, i.e., upstroke. This motion expands thediaphragm 120 and draws the oil away from themotor seal 115. In this respect, reciprocation of thepump 100 may be accomplished by changing the rotational direction of themotor shaft 125. - During this upstroke, the traveling
valve 142 is moved closer to the standingvalve 150, thereby compressing thefluid chamber 145. In turn, the pressure in thefluid chamber 145 increases, which forces theball 151 of the standingvalve 150 to unseat. Opening of the standingvalve 150 allows fluids in thefluid chamber 145 to be delivered to theproduction tubing 20. In this manner, wellbore fluids may be delivered by positive displacement toward the surface. - In another embodiment, the
reciprocating pump 700 may be driven by ahydraulic pump 715 operated by apermanent magnet motor 710.FIG. 2A shows a partial view of an exemplary hydraulically driven reciprocatingpump 700. Thepump 700 includes ahousing 712 having one ormore ports 713 for fluid communication with thewellbore 10. Anexpandable member 720 in thehousing 712 fluidly seals off aninterior portion 711 of thepump 700 from the wellbore fluids. Theinterior portion 711 acts as a reservoir for holding working fluid for thehydraulic pump 715. Suitable expandable members include a diaphragm and a bellow. - The
expandable member 720 may be retracted or expanded using thehydraulic pump 715. An exemplary hydraulic pump suitable for use is a swash-plate hydraulic pump capable of providing high working pressure with high reliability. Thehydraulic pump 715 may be driven by thepermanent magnet motor 710 either directly or using a gearbox. One advantage of direct drive is reliability in long-term continuous operation. As shown, thehydraulic pump 715 and themotor 710 are immersed in the working fluid in theinterior portion 711. In this respect, no motor seals are required. - The
hydraulic pump 715 is connected to apiston 735 andcylinder 730 assembly adapted to reciprocate theexpandable member 720. In one embodiment, thecylinder 730 includes afluid chamber piston 735. Thepiston 735 is extended or retracted by alternately directing thehydraulic pump output 740 into eachchamber piston 735 is connected to an upper portion (e.g., plate 722) of theexpandable member 720 such that as thepiston 735 is alternately extended and retracted, theexpandable member 720 is reciprocated. Electronically operatedhydraulic valves hydraulic pump output 740 to therespective chambers cylinder 730. The electrical circuit of thevalves piston 735 and switch thevalves piston 735 may optionally include alower protrusion 736 to ensure the working surface on each side of the piston exerts the same force for the same injected pressure. - In operation, the
motor 710 may be operated continuously in one direction to drive thehydraulic pump 715, which, in turn, may be adapted to reciprocate areciprocating arm 140, as described with respect toFIG. 2 . Thehydraulic pump 715 takes in working fluid from the reservoir and outputs 740 the working fluid to thecylinder 730. InFIG. 2A , thepiston 735 is in its upward stroke. As such, thelower valve 752 is energized to allow thehydraulic pump 715 to inject the working fluid into thelower chamber 732. At the same time, theupper valve 751 is de-energized to allow the working fluid in theupper chamber 731 to drain into the reservoir. In this manner, thepiston 735 is urged upward to expand theexpandable member 720, thereby placing thereciprocating arm 140 in an upstroke. During this upstroke, the travelingvalve 142 is moved closer to the standingvalve 150, thereby compressing thefluid chamber 145. In turn, the pressure in thefluid chamber 145 increases, which forces theball 151 of the standingvalve 150 to unseat. Opening of the standingvalve 150 allows fluids in thefluid chamber 145 to be delivered to theproduction tubing 20. - When the electrical circuit detects the
piston 735 is at its upper travel limit, the electrical circuit switches thevalves lower valve 752 is de-energized to allow thelower chamber 732 to drain and theupper valve 751 is energized to allow theupper chamber 731 to fill. In this manner, thepiston 735 is urged downward to retract theexpandable member 720, thereby placing thereciprocating arm 140 in a downstroke. The downstroke increases the size of thefluid chamber 145, which results in a pressure decrease in thefluid chamber 145. As the pressure decreases, the pressure differential between the inside and the outside of thefluid chamber 145 increases, thereby creating a vacuum like effect inside thefluid chamber 145. The strength of the vacuum is dependent on the length of travel of the travelingvalve 141. The downstroke of thereciprocating arm 140 creates a vacuum sufficient to cause theball 141 of the travelingvalve 142 to unseat so that wellbore fluids are drawn upward into thefluid chamber 145. During this time period, the standingvalve 151 preferably remains closed. After thefluid chamber 145 is filled sufficiently with wellbore fluids, thelower valve 752 is energized and cycle restarts. - In another embodiment, a check valve is used 242, and the traveling
valve 142 is eliminated.FIG. 3 shows a partial view of an embodiment of thepump 200 where linear movement of theplate 222 changes the volume ofcavity 245. As theplate 222 is contracted, the pressure in thecavity 245 drops below the casing pressure, thereby opening thecheck valve 242 and allowing well fluids to flow into thecavity 245. The motor rotation is reversed whenplate 222 reaches the bottom position. At this point, thecheck valve 242 closes. During the upstroke, the volume in thecavity 245 is decreased, thereby increasing the pressure of the fluid in thecavity 245. When the pressure in thecavity 245 exceeds the pressure in thetubing 20, the standingvalve 250 opens to receive the well fluid in thecavity 245. The continued upstroke expels the fluid through the standingvalve 250 into theproduction tubing 20. Whenplate 222 reaches the top of the stroke, the motor reverses rotation and the pressure in thecavity 245 begins to drop. At this point, the standingvalve 250 closes and the pumping cycle repeats itself. - In another embodiment, the
motor 310 may be coupled to twopumps FIG. 4 . Each of thepumps motor shaft 325 of themotor 310 using a ball screw type connection. In this embodiment, the motor is adapted to simultaneously actuate bothpumps motor shaft 325 causes thepumps motor shaft 325 places pump 300 in the upstroke, then pump 400 will be in the downstroke. Thus, pump 300 will be expelling fluid, while thepump 400 will be drawing in fluid. When themotor 310 reverses rotation, thepumps bypass tubing 340 is used to deliver fluids frompump 400 to theproduction tubing 20. - One advantage of this two pump system is that clean fluid in the
interior portions pumps top pump 300 to thebottom pump 400. While movement of theplate 122 and bellows 120 increases or decreases the volume in theinterior portion 311 in onepump 300, an equal change in volume is occurring in theother pump 400. Therefore, themotor seal 315 does not need to compensate for the changing volume in theinterior portions interior portions motor 310. The transfer of oil transferred from onepump 300 to theother pump 400 may provide additional cooling for themotor 310. - Referring back to
FIG. 1 , thepump 100 and themotor 110 may be installed in awellbore 10 at a location below asubsurface safety valve 170. As shown, thepump 100 and themotor 110 are connected to aproduction tubing 20, which extends to the surface. Asubsurface safety valve 170 is installed between the surface and thepump 100 as a safety measure in case theproduction tubing 20 is damaged. Thesafety valve 170 is adapted to accommodate a connection member that runs from the surface to thepump 100 without interfering with the integrity of thesafety valve 170. In one embodiment, the connection member may be anelectric cable 175 used to supply energy to operate themotor 110. Thepower cable 175 is connected to a high pressure penetrator that passes through thesafety valve 170. An exemplary safety valve is disclosed in U.S. Patent Application Publication No. 2005/0077050, filed on Oct. 14, 2003, which application is incorporated by reference herein in its entirety. Thesubsurface safety valve 170 advantageously allows energy to be supplied to a motor located below the safety valve in order to remove liquids from the wellbore. -
FIG. 5 shows another embodiment of apump assembly 501 for lifting fluids to the surface. Thepump assembly 501 includes an electricalsubmersible pump 500 operated by arotary motor 510. Preferably, therotary motor 510 may be rotated in opposite directions. The change in motor direction will cause thepump 500 to pump the fluid in the opposite direction, thereby reversing fluid flow in thepump 500. - The
pump assembly 501 further comprises twopump chambers pump chambers chambers check valves inlet valves respective pump chambers outlet valves pump chambers production tubing 20. - Each of the
pump chambers respective diaphragm diaphragms chamber diaphragms chamber chamber diaphragms diaphragm chamber diaphragm - The
diaphragms submersible pump 500. The operating fluid may be a hydraulic fluid or other suitable incompressible fluid. In the preferred embodiment, thepump 500,diaphragms diaphragms diaphragm other diaphragm pump 500. As a result, withdrawal of a portion of the operating fluid from onediaphragm diaphragm other diaphragm diaphragm pump chambers pump chambers - In operation, the
pump 500 is operated to pump operating fluid from thefirst diaphragm 512 to thesecond diaphragm 522, thereby deflating thefirst diaphragm 512 and inflating thesecond diaphragm 522. In turn, the volume of thefirst chamber 511 is increased. As the volume increases, the pressure in thefirst chamber 511 is reduced, thereby drawing in formation fluid through the firstinlet check valve 515 to fill thefirst chamber 511. During filling, the firstoutlet check valve 516 is preferably closed or substantially closed. On the other hand, inflation of thesecond diaphragm 522 causes a reduction in the volume of thesecond chamber 522, thereby discharging the formation fluids accumulated in thesecond chamber 522. The formation fluids are expelled through the secondoutlet check valve 526, which leads to theproduction tubing 20. During this time, the secondinlet check valve 525 is closed to prevent the formation fluids from returning into the wellbore. - After the
second chamber 512 has expelled a sufficient amount of formation fluids, thesecond chamber 512 is ready for the filling phase, while thefirst chamber 511 is ready for the discharge phase. To make the transition, themotor 510 is rotated in the opposite direction to cause thepump 500 to pump the operating fluid in the opposite direction, thereby deflating thesecond chamber 521 and inflating thefirst chamber 511. In this respect, thediaphragm 512 in thefirst chamber 511 is expanded to force the accumulated formation fluids out of thechamber 511 and into theproduction tubing 20, while thediaphragm 522 in thesecond chamber 521 is retracted to draw formation fluids into thesecond chamber 521. In this respect, thepump 500 may be operated to alternately drive formation fluids to the surface. The use of a rotary motor that can rotate in at least two different directions provides an efficient manner of producing fluids to the surface. -
FIG. 6 shows another embodiment of the pump assembly 601. In this embodiment, the pump assembly includes twopump chambers diaphragm chamber diaphragms motor 510 and thepump 500 drive the working fluid between the twodiaphragms diaphragm - To initiate the fill cycle in the
first chamber 611, working fluid is moved from thefirst diaphragm 612 to thesecond diaphragm 622. Movement of the working fluid to thesecond diaphragm 622 initiates the discharge cycle in thesecond chamber 621. To discharge the accumulated fluid in thefirst chamber 611, the rotation of themotor 510 is reversed. In one embodiment, the motor rotation is reversed by reversing the phase sequence of the coils in the permanent magnet motor. The change in motor rotation results in a change in the flow of the operating fluid, now out of thesecond diaphragm 622 and into thefirst diaphragm 612. As a result, thefirst diaphragm 612 is expanded, there by forcing the accumulated formation fluid out of thefirst chamber 611, and thesecond diaphragm 622 is retracted, thereby by drawing in formation fluid to fill thesecond chamber 621. - In another embodiment, the
diaphragms hydraulic pump 715 andmotor 710 described with respect toFIG. 2A . For example, thelower chamber 732 and theupper chamber 731 may be placed in fluid communication with arespective diaphragm lower chamber 732,diaphragm 612 will be expanded. At the same time,diaphragm 622 is allowed to drain through theupper chamber 731. After theupper valve 751 is energized, working fluid is pumped into theupper chamber 731 to filldiaphragm 622, while working fluid indiaphragm 612 is drained through thelower chamber 732. - While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (32)
1. A pump assembly, comprising:
a rotary motor adapted to actuate a reciprocating pump.
2. The pump assembly of claim 1 , wherein the rotary motor is coupled to the reciprocating pump using a ball screw type connection.
3. The pump assembly of claim 2 , wherein rotation of the rotary motor causes a reciprocating action of the reciprocating pump.
4. The pump assembly of claim 1 , wherein the rotary motor comprises a permanent magnet motor.
5. The pump assembly of claim 1 , wherein rotation of the rotary motor causes a reciprocating action of the reciprocating pump.
6. The pump assembly of claim 1 , wherein the reciprocating pump comprises a positive displacement pump.
7. The pump assembly of claim 1 , wherein the pump assembly comprises an electrical submersible pump.
8. The pump assembly of claim 1 , further comprising a motor seal coupled to the reciprocating pump, the motor seal adapted for fluid expansion.
9. The pump assembly of claim 1 , wherein the reciprocating pump comprises a first valve and a second valve adapted to regulate flow into and out of a fluid chamber.
10. The pump assembly of claim 9 , wherein reciprocation in a first direction causes the first valve to open, thereby supplying fluid into the fluid chamber.
11. The pump assembly of claim 10 , wherein reciprocation in a second direction causes the second valve to open, thereby expelling fluid out of the fluid chamber.
12. The pump assembly of claim 1 , wherein the reciprocating pump comprises an expandable member adapted for reciprocating movement.
13. The pump assembly of claim 12 , wherein the expandable member comprises a diaphragm or bellow.
14. The pump assembly of claim 1 , wherein the reciprocating pump is adapted to discharge directly into a tubing.
15. A method of lifting fluids from a wellbore, comprising:
providing a pump assembly having a reciprocating pump actuated by a rotary motor;
positioning the pump assembly in the wellbore;
operating the rotary motor to actuate the reciprocating pump; and
lifting fluids from the wellbore.
16. The method of claim 15 , wherein a drive member of the reciprocating pump is threadedly coupled to a motor shaft of the rotary motor.
17. The method of claim 16 , wherein rotation of the motor shaft causes the drive member to move along the motor shaft.
18. The method of claim 17 , wherein movement of the drive member causes a fluid chamber to expand or compress.
19. The method of claim 15 , wherein actuating the reciprocating pump comprises reciprocating the pump in a first direction and a second direction.
20. The method of claim 19 , wherein reciprocating in the first direction supplies fluid into a fluid chamber and reciprocating in a second direction expels fluid from the fluid chamber.
21. The method of claim 15 , further comprising reciprocating an expandable member.
22. A pump assembly, comprising:
a pump adapted to pump a fluid between at least two fluid cavities; and
a rotary motor adapted to actuate the pump, wherein a flow of the fluid between the at least two fluid cavities is reversed by changing a rotational direction of the rotary motor.
23. The pump assembly of claim 22 , wherein each of the fluid cavities is expandable.
24. The pump assembly of claim 22 , wherein each of the fluid cavities comprise an expandable member.
25. The pump assembly of claim 22 , wherein the each of the fluid cavities is at least partially disposed in a chamber.
26. The pump assembly of claim 25 , wherein expansion or retraction of the fluid cavity controls the flow of a pumped fluid in the chamber.
27. The pump assembly of claim 22 , wherein the rotary motor comprises a permanent magnet motor.
28. A method of lifting fluids from a wellbore, comprising:
providing a pump assembly having a rotary motor and a fluid chamber;
rotating the rotary motor in a first direction to introduce fluid into the fluid chamber;
rotating the rotary motor in a second direction to discharge fluid from the fluid chamber; and
lifting the discharge fluid from the wellbore.
29. The method of claim 28 , wherein the pump assembly comprises a second fluid chamber, wherein the second fluid chamber is discharging fluid while fluid chamber is accumulating fluid.
30. The method of claim 28 , further comprising discharging fluid from a second chamber while the fluid is being introduced into the fluid chamber.
31. The method of claim 28 , further comprising expanding an expandable member in the fluid chamber while fluid is being discharged from the fluid chamber.
32. The method of claim 28 , further comprising retracting an expandable member in the fluid chamber while fluid is being introduced into the fluid chamber.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/536,294 US20080080991A1 (en) | 2006-09-28 | 2006-09-28 | Electrical submersible pump |
NO20074894A NO20074894L (en) | 2006-09-28 | 2007-09-26 | Electrical Submersible Pump |
GB0718755A GB2447528A (en) | 2006-09-28 | 2007-09-26 | Electrical submersible pump |
CA002604508A CA2604508A1 (en) | 2006-09-28 | 2007-09-27 | Electrical submersible pump |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/536,294 US20080080991A1 (en) | 2006-09-28 | 2006-09-28 | Electrical submersible pump |
Publications (1)
Publication Number | Publication Date |
---|---|
US20080080991A1 true US20080080991A1 (en) | 2008-04-03 |
Family
ID=38701659
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/536,294 Abandoned US20080080991A1 (en) | 2006-09-28 | 2006-09-28 | Electrical submersible pump |
Country Status (4)
Country | Link |
---|---|
US (1) | US20080080991A1 (en) |
CA (1) | CA2604508A1 (en) |
GB (1) | GB2447528A (en) |
NO (1) | NO20074894L (en) |
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Also Published As
Publication number | Publication date |
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GB2447528A (en) | 2008-09-17 |
NO20074894L (en) | 2008-03-31 |
CA2604508A1 (en) | 2008-03-28 |
GB0718755D0 (en) | 2007-11-07 |
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