CA2286502A1 - Submersibly driven reciprocating pump - Google Patents
Submersibly driven reciprocating pump Download PDFInfo
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- CA2286502A1 CA2286502A1 CA 2286502 CA2286502A CA2286502A1 CA 2286502 A1 CA2286502 A1 CA 2286502A1 CA 2286502 CA2286502 CA 2286502 CA 2286502 A CA2286502 A CA 2286502A CA 2286502 A1 CA2286502 A1 CA 2286502A1
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- string
- pump
- well
- conduit
- plunger
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Abstract
A well pump assembly includes a motor that has a rotating drive shaft. The motor is secured to the lower end of a string of tubing, A reversing linear actuator is carried inside the string of tubing. The linear actuator has a first member that is rotated by the drive shaft and a second member that does not rotate, rather moves linearly in response to rotation of the fast member. One of the members is a tracked rod and the other member is a driver cage carried by the tracked rod. A lower connector is also carried in the string of conduit. The lower connector has a coupling on its lower end that stabs into engagement with a coupling on the upper end of the motor drive shaft. A reciprocating type pump is carried within the string of conduit. The pump has a reciprocating plunger, as intake port for receiving well fluid and a discharge port for discharging well fluid up the string of conduit. The linear actuator drives the reciprocating plunger. The pump, linear actuator and connector member are retrievable through the string of conduit while the motor assembly remains suspended below the string of conduit.
Description
PATir7VT APPLICATION
Docket 104-12580 nVVENTORS: DAVID BLAIN DILLON
DAV'm LESTER OLSON
STEVEN K. TETZLAFF
1 SUSMERSrBL'Y DRIVEN RECIPROCATING PUMP
Docket 104-12580 nVVENTORS: DAVID BLAIN DILLON
DAV'm LESTER OLSON
STEVEN K. TETZLAFF
1 SUSMERSrBL'Y DRIVEN RECIPROCATING PUMP
2 This application claims the priority to Provisional Application S.N.
6U/104,258, filed 3 October 14, 1998.
6U/104,258, filed 3 October 14, 1998.
4 ?p4c,~i_sl Ff.P~ld This invention relates is general to well puaaps aad in particular to a reciprocating 6 pump that is driven by a dowr~hole motor, Wherein the pump is retrievable through the tubing 7 while leaving the motor downhole, 9 Several types of puxaps are employed forpumpiag oil welts. One type ofpurnp uses a string of sucker mds that exte~ads from the surface through a striae of tubing to a plunger 1 I or piston in the well. The pluager or piston is carried is a barrel that is attached to a lower 12 end of the string of tubing. The upper end of the rod is connected to a pivotal beam that 13 reciprocates the rod up and down to pump the well flaid. These type of pumps are used to 14 pump moderate volumes in shallow to medium depth wells. Because of stretch in the rod string, they are not used in deep wells. When repair is needed, a workover rig must be used 16 to pull the strip of rods and the pump froru the well.
1 Another type of pump uses a centrifugal pump drivetr by a downttole electrical motor.
2 The pump and ~odotor are suspended on tubing, with a power cord oo the motor extending 3 alongside the tubing to the surface. The motor rotates the puaap to pump fluid through the 4 tubing to the surface. These types of pumps are used in medium and high volume wells, particularly is those that produce large amouat5 of salt water. Centrifugal pumps can be used 6 in deep wells. A workover rig is necessary when maintenance is required because the string 7 of tubing must be pulled.
8 Progressive cavity pumps are used for pumping lower volumes, particularly if the 9 well fluid is very viscous. A progessive cavity pump has a rotating helical rod that is carried within an elastomexic stator that has helical cavities. Ia some installations, a rotating drive 11 shaft extends fro~an the surface down the tubing, with a drive motor being located at the 12 surface. In ether cases, an electrical motor is located dowahole for rotating the helical rod.
13 One design allows the rotor and stator to be retrieved through the tubing to the surface for 14 repair while the motor remains secured to the lower end of the tubir~.
Progressive cavity pumps are limited to a maximum temperature range that is lower than the other types of 16 pumps because of the elastomeric stator.
17 l~i~cine~re a~f the >frv n~, ties 18 The well puxap of this invention utilizes a dowahole motor for rotating a drive shaft.
! 9 A linear actuator is coupled to the upper end of the motor for converting xotatianal motion 2Q into reciprocating linear motion. ?he linear actuator connects to a reciprocating pump.
21 The motor is secured to a lower end of a string of tubing. The pump and linear 22 aatuaeer are carriEd within the tubing. Z'!te linear acsu~tor has a connector on its lower end 1 that will stab into engagement with a drive shaft coupling of the motor aaseaibly. 'ibis 2 allows the pump nerd linear actuator ro be rotrieved through the tubing to the surface for 3 maiatestance while the motor remains downhole.
Figures tA~1D comprise a vertical sectional view of a well pump assembly coaatructrd irr accordance with this invention 7 Figure 2 is a partial sectional view of the well pump assembly of Figure l, showing 8 a gortion of the well pump assembly being retrieved to the surface while the taetor assetably 9 remains downhole.
11 Reftrcing to Figure IA, the well will have one or more strings of casing 11 (not 12 shown in Fig. Z) that are cemented in the well. Casing 1 l has perforations (not shown) near 13 its lower end that allow the flow of well fluid into the casing from the earth formation. A
14 string of conduit or tubing 13 is shown suspended is casing 11. 'I~bing 13 is azade up a plwrality of joints of pipes secured together. The lowest joint 15 of tubing t3 has intake ports 16 17 (Fig. iB) for admitting well fluid from interior of casing 11 into the string of tubing 13.
17 A reciprocating pump 19 is located within tubing 13. Pump 19 has a pump housing 18 21 with a oylindrieal portion. A piston or plunger 23 reciprocates within the cylindrical I9 portion of pump housing 21. Pump 19 has an intake ZS that adtaits well fluid from the interior of tubing 13 through plunger 23 sad a discharge 27 oa a downstroke, Aa annular 21 eeal or pockvf~ 28 seals pump housing 2t to the interior of tubing 13 above intake 25. A
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I valve causes well acid to be pumped by th:e reciprocating action of plunger 23. In the 2 cmbodimmt shown, the valve includes a ball 29 located within a passage in plunger 23. Ball 3 29 is ft'ee to move a~ally, and is the lower position will engage a seat 31.
This blocks well 4 fluid from flowing back downward through plunger 23 during the ugstmke. Oa the dowrrstroke, the well fluid flows through a plunger inlet 33 and throtsgtt seat 31. On the 6 dowastroke, ball 29 will move above scat 31, arid on the upstroke, ball 29 will locate on scat 7 3 i. Well fluid thus flows through plunger 23 and out discharge 27 on the dowr~.snroko. On 8 the upstroke, plunger 23 pushes the column of well fluid upward for the length of the stroke.
9 Other types of valves are suitable arid are known in the art, including valves that are not located in plunger 23 and that have multiple balls and seats.
11 A retrieval member 35 is located on the upper end ofpump 19, Retrieval member 12 35 may be of any conventional type that is adapted to be engaged by a retrieval tool lowered 13 from the surface on wireline or coiled tubing. In the embodiment shown, retrieval member 14 35 has a receptacle that receives the retrieval tool .(not Shown).
Retrieval member 35 allows 1 S pump 19 to be lowered and retrieved through tubing 13.
16 A pump shaft or stem 37 extends downward from pump housing 21. Pump shaft 17 extends into as upper portion of a linear acNator 39. Linear actuator 39 iaclu~des a housing 18 41 that is rigidly connected to pump housing 21. As shown is Figure 1B, a tracked rod 43 I9 is rotasably carried within linear actuator housing 41. IZod 43 has helical grooves 45 formed along an upper portion of its length. A driver cage 47 surrounds rod 43 and has a plurality 21 of balls 49 that engage grooves 45. Rotating rod 43 causes driver cage 47 to move linearly.
22 Whey at the upper cad of grooves 45, a turnaround portion of grooves 45 cause driver cage 23 47 to movr back downward. Whmn st the lower end, ~ turnaround portion of hooves 45 d - .. . . . , . " ,,. . . .. .. .. . , , . . . ... . .. . . _ . .. _ . . . . .
1 causes drives cage 47 to reverse cad move back upward. Linear actuators of this nature are 2 commercially available.
3 A tube Sl is secured to driver cage 47 5ar anov~ent with driver cage 47. A
bearing 4 52 mounts to driver cage 47 cad the lowest cad of tube 51 for slid'gly engaging the inner wall of housing 41. As shown is Figure IA, a bearing 53 is mounted to the upper cad of 6 tube 51 slidiagly algages the bore of housing 41. Bearing 53 co~ects stem 37 to tube 51, 7 with these three components and stem 37 serving as an upper conaoctor for connecting linear 8 actuator 39 to pump 19. 'Iylbc 51 rescues upward and downward in response to rotation of 9 rod 43, oauaing stern 37 and plunger 23 to raciproeate up and down.
TO Referring again to Figure 1B, a lows portion 43a of and 43 extends through a 11 partition 55. Lower gortion 43a does not have grooves 45, rather it is smooth and 12 cylindrical. A seal is located at partition 55. Also, a bladder type seal 56 may be located 13 below partition 55 to further prevent any enacachmeat of well Duid into linear actuator 39.
14 As shown is Figure 1C, lower portion 43a of rod 43 terminates with a splined coupling 57.
Spliced, eoupliag 57 fits within a socket in the upper end of a drive member 59. Drive 16 member 59 is rotatably carried within a guide sleeve 61. Guides sleeve 61 is stationarily 17 secured to the lower erld of linear actuator housing 41 cad inserts into as adapter 63.
18 Adapter 63 is a tubular member having a cylindrical bore portion that closely receives I9 guide sleeve 61. Drive member 59 has a splined receptacle 65 oa its lower cad. In the embodiment shown, receptacle 65 is a separate cup-shaped internally spurted element that 21 is socured within a cavity formed is the lower end of drive member 59.
Cruide sleeve 61 has 22 a plurality of longitudinal slots 67 (only one shown) extending axially along the exterior 23 wall. Slot 67 a adapted to cr~agc a key 69 that is saeu~d within the side wall of adapter 63.
1 Another type of pump uses a centrifugal pump drivetr by a downttole electrical motor.
2 The pump and ~odotor are suspended on tubing, with a power cord oo the motor extending 3 alongside the tubing to the surface. The motor rotates the puaap to pump fluid through the 4 tubing to the surface. These types of pumps are used in medium and high volume wells, particularly is those that produce large amouat5 of salt water. Centrifugal pumps can be used 6 in deep wells. A workover rig is necessary when maintenance is required because the string 7 of tubing must be pulled.
8 Progressive cavity pumps are used for pumping lower volumes, particularly if the 9 well fluid is very viscous. A progessive cavity pump has a rotating helical rod that is carried within an elastomexic stator that has helical cavities. Ia some installations, a rotating drive 11 shaft extends fro~an the surface down the tubing, with a drive motor being located at the 12 surface. In ether cases, an electrical motor is located dowahole for rotating the helical rod.
13 One design allows the rotor and stator to be retrieved through the tubing to the surface for 14 repair while the motor remains secured to the lower end of the tubir~.
Progressive cavity pumps are limited to a maximum temperature range that is lower than the other types of 16 pumps because of the elastomeric stator.
17 l~i~cine~re a~f the >frv n~, ties 18 The well puxap of this invention utilizes a dowahole motor for rotating a drive shaft.
! 9 A linear actuator is coupled to the upper end of the motor for converting xotatianal motion 2Q into reciprocating linear motion. ?he linear actuator connects to a reciprocating pump.
21 The motor is secured to a lower end of a string of tubing. The pump and linear 22 aatuaeer are carriEd within the tubing. Z'!te linear acsu~tor has a connector on its lower end 1 that will stab into engagement with a drive shaft coupling of the motor aaseaibly. 'ibis 2 allows the pump nerd linear actuator ro be rotrieved through the tubing to the surface for 3 maiatestance while the motor remains downhole.
Figures tA~1D comprise a vertical sectional view of a well pump assembly coaatructrd irr accordance with this invention 7 Figure 2 is a partial sectional view of the well pump assembly of Figure l, showing 8 a gortion of the well pump assembly being retrieved to the surface while the taetor assetably 9 remains downhole.
11 Reftrcing to Figure IA, the well will have one or more strings of casing 11 (not 12 shown in Fig. Z) that are cemented in the well. Casing 1 l has perforations (not shown) near 13 its lower end that allow the flow of well fluid into the casing from the earth formation. A
14 string of conduit or tubing 13 is shown suspended is casing 11. 'I~bing 13 is azade up a plwrality of joints of pipes secured together. The lowest joint 15 of tubing t3 has intake ports 16 17 (Fig. iB) for admitting well fluid from interior of casing 11 into the string of tubing 13.
17 A reciprocating pump 19 is located within tubing 13. Pump 19 has a pump housing 18 21 with a oylindrieal portion. A piston or plunger 23 reciprocates within the cylindrical I9 portion of pump housing 21. Pump 19 has an intake ZS that adtaits well fluid from the interior of tubing 13 through plunger 23 sad a discharge 27 oa a downstroke, Aa annular 21 eeal or pockvf~ 28 seals pump housing 2t to the interior of tubing 13 above intake 25. A
. . . ~ . ~ . . . . .. . ~, . . , , .. . .. .... , , . . .. , . . , .,. ~. ,~, . ....... , ;.._ . .
I valve causes well acid to be pumped by th:e reciprocating action of plunger 23. In the 2 cmbodimmt shown, the valve includes a ball 29 located within a passage in plunger 23. Ball 3 29 is ft'ee to move a~ally, and is the lower position will engage a seat 31.
This blocks well 4 fluid from flowing back downward through plunger 23 during the ugstmke. Oa the dowrrstroke, the well fluid flows through a plunger inlet 33 and throtsgtt seat 31. On the 6 dowastroke, ball 29 will move above scat 31, arid on the upstroke, ball 29 will locate on scat 7 3 i. Well fluid thus flows through plunger 23 and out discharge 27 on the dowr~.snroko. On 8 the upstroke, plunger 23 pushes the column of well fluid upward for the length of the stroke.
9 Other types of valves are suitable arid are known in the art, including valves that are not located in plunger 23 and that have multiple balls and seats.
11 A retrieval member 35 is located on the upper end ofpump 19, Retrieval member 12 35 may be of any conventional type that is adapted to be engaged by a retrieval tool lowered 13 from the surface on wireline or coiled tubing. In the embodiment shown, retrieval member 14 35 has a receptacle that receives the retrieval tool .(not Shown).
Retrieval member 35 allows 1 S pump 19 to be lowered and retrieved through tubing 13.
16 A pump shaft or stem 37 extends downward from pump housing 21. Pump shaft 17 extends into as upper portion of a linear acNator 39. Linear actuator 39 iaclu~des a housing 18 41 that is rigidly connected to pump housing 21. As shown is Figure 1B, a tracked rod 43 I9 is rotasably carried within linear actuator housing 41. IZod 43 has helical grooves 45 formed along an upper portion of its length. A driver cage 47 surrounds rod 43 and has a plurality 21 of balls 49 that engage grooves 45. Rotating rod 43 causes driver cage 47 to move linearly.
22 Whey at the upper cad of grooves 45, a turnaround portion of grooves 45 cause driver cage 23 47 to movr back downward. Whmn st the lower end, ~ turnaround portion of hooves 45 d - .. . . . , . " ,,. . . .. .. .. . , , . . . ... . .. . . _ . .. _ . . . . .
1 causes drives cage 47 to reverse cad move back upward. Linear actuators of this nature are 2 commercially available.
3 A tube Sl is secured to driver cage 47 5ar anov~ent with driver cage 47. A
bearing 4 52 mounts to driver cage 47 cad the lowest cad of tube 51 for slid'gly engaging the inner wall of housing 41. As shown is Figure IA, a bearing 53 is mounted to the upper cad of 6 tube 51 slidiagly algages the bore of housing 41. Bearing 53 co~ects stem 37 to tube 51, 7 with these three components and stem 37 serving as an upper conaoctor for connecting linear 8 actuator 39 to pump 19. 'Iylbc 51 rescues upward and downward in response to rotation of 9 rod 43, oauaing stern 37 and plunger 23 to raciproeate up and down.
TO Referring again to Figure 1B, a lows portion 43a of and 43 extends through a 11 partition 55. Lower gortion 43a does not have grooves 45, rather it is smooth and 12 cylindrical. A seal is located at partition 55. Also, a bladder type seal 56 may be located 13 below partition 55 to further prevent any enacachmeat of well Duid into linear actuator 39.
14 As shown is Figure 1C, lower portion 43a of rod 43 terminates with a splined coupling 57.
Spliced, eoupliag 57 fits within a socket in the upper end of a drive member 59. Drive 16 member 59 is rotatably carried within a guide sleeve 61. Guides sleeve 61 is stationarily 17 secured to the lower erld of linear actuator housing 41 cad inserts into as adapter 63.
18 Adapter 63 is a tubular member having a cylindrical bore portion that closely receives I9 guide sleeve 61. Drive member 59 has a splined receptacle 65 oa its lower cad. In the embodiment shown, receptacle 65 is a separate cup-shaped internally spurted element that 21 is socured within a cavity formed is the lower end of drive member 59.
Cruide sleeve 61 has 22 a plurality of longitudinal slots 67 (only one shown) extending axially along the exterior 23 wall. Slot 67 a adapted to cr~agc a key 69 that is saeu~d within the side wall of adapter 63.
1 Key b9' protrudes inward into the bore of adapter 63. Once is engagesaent as shown in 2 Figure 1B, key 69 ptcvents rotstioa of guide slccvc 61 rdative to adapter 63. Adapter 3 63 has a threaded section oa its upper cad for sxuriag to the lowest section 15 of tubing 13.
4 A drive shaft extension 71 located below linear actuator 39 has a splined couglino 72 oa its upper end for mating with splined receptacle 65 of drive member 59.
Drive shaft 6 extension 71 is mounted for rotation within a lower cylindrical portion of adapter 63. A
4 A drive shaft extension 71 located below linear actuator 39 has a splined couglino 72 oa its upper end for mating with splined receptacle 65 of drive member 59.
Drive shaft 6 extension 71 is mounted for rotation within a lower cylindrical portion of adapter 63. A
7 bushing 72 centers and serves as a beating fox drive shaft actensioa 71 to allow ~rotahon.
8 Drive shaft extension 71 has a stop flange 75 oa its lower end that is greater in diameter than 9 the lower portion of adapter 63. Stop member 75 prevents drive shaft acteasion 71 from being pulled upward oui of adapter 63.
lI 'The motor assembly for the pump irteludes a conventional seal section 77 for 12 oqualiz~ing the intcmal lubricant pressure in the motor assembly with the hydrostatic pressure 13 in casing 11. Seal section 77 mounts to the lower end of adapter 63. A
drive shaft 79 14 extends through seal section 7? and couples to the lower end of drive shaft extension 71, which may be considered a portion of drive shaft 79. Seal section 77 is secured to a gear 16 reducer 81. Gear reducer 81 is secured to the upper end of an electrical motor 83 as shown 17 in Figure iD. Motor 83 is preferably a three-phase electrical motor supplied with power 18 freer an electrical lint 85, Electrical line 85 extends alongside linear actuator 39 and is 19 strapped to the string of tubing 13. Alternately, motor 83 may be hydraulically driven. 'Ihe ZO outer diameter of motor 83, as well as seal section 77 and gear reducer 81, is larger than the Z 1 inner diameter of tubing 13.
22 In operation, once installed as shown in Figures lA iD, electrical power supplied to 23 motor 83 sauces drive shift 79 to relate rod d3 (Fig. 1B). ?his causes driver cage 47 to .:.: . ...,.. .....,: .._.., .. . ..;.. . .. -.
1 reciprocate up and down along with tube S1. ?ube 51 causes stem 37 (Fig. lA) to 2 reciprocate up and down, resulting is plunger 23 reciprocating up and down.
On each 3 dowasoolCe, ball 29 will move above scat 31, allowing well fluid to flow around ball 29 and 4 out discharge ports 27. On the upstroke, ball 29 will engage seat 31, pushing the column of fluid upward is tubing 13, with a portion flowing out the upper end of the well If it is necessary to remove pump 19 or linear actuator 39 for maintenance or 7 replacement, the operator lowers a retrieval tool (not shoran) an a wireline into engagement 8 retrieval member 35. The operator then pulls upward. This causes pump 19 to move 9 upward, bring along with it linear actuator 39. As shown in Figure 2, guide sleeve 61 and drive member 59, which serve as a connector between littcar actuator 39 and drive shaft 79, 11 will also move upward. Receptacle 65 will disengage from drive shaft coupling 72. Adapter 12 63 and the motor assembly will remain in the well secured to the string of tubing 13. ?he 13 remvainiag components are pulled to the suriaoe through tubing i3. A new yr repaired pump 14 19 or linear actuator 39 is lowered into the well on a retrieval tool.
Drive member 59 (Fig.
1 S 1B) will stab into engagement with coupling 72, reconnecting the well pump assembly for t6 operation.
17 For an initial installation, adapter 63, seal section 77, gear reducer 81 axed motor 83 18 may be connected to a string of tubing 13 and lowered into the well. Then, pump 19, izmer 19 actuator 39 and drive member 59 and guide slewe G 1 may be lowered through tubing 13 into engagement with the motor. Alternately, during the initial installation, the entire pump and 21 motor assecably could be connected at the surface to tubing 13 and lowered into the well as 22 a unit with the string of tubissg.
1 The invention has significant advantages. Specifically, advantages include the 2 elimination of sucker rod string that is coaamnnly used to actuate a recipracatirlg pump 3 assembly from the surface. The device eliminates depth limitations associated with 4 reciprocaring pumps The system of the iaveation eliminates rod. and tubing wear commonly associated with applications where wellbore deviation exists. The system does not suffer 5 from downhole tenaperatu~ree limitations like those imposed on a progressive cavity pump 7 type system used for low volume applicatioaa. T'he pump is actuated from the bottom end, 8 which reduces the o~cieney losses of the pump commonly caused by the prescace of a rod 9 sting in the tubing above the pump, 'The system of the invention elirniaates environmental risk associated with satf6ag box leakage on the surface. xn the system of the inv~tioa, the 11 pump may be n~ieved for repair or replacement without pulling the motor assembly. The 1 Z need for a workover rig to install or pull the pump assembly is eliminated.
t3 Although the invention is shown in only one of its forms, it should be apparent to 14 those skilled in the art that it is sot so limited,, but is suscepa'ble to various changes without departing from the scope of the invention, For example, the linear actuator could be 16 amnged to drive a hydraulic device, which then drives the reciprocating pump. This 17 hydraulic device operating in a way 9milar to a hydraulic jack, would increase the liR of the 18 electrical submersible pump system over that possible with just the linear actuator alone.
lI 'The motor assembly for the pump irteludes a conventional seal section 77 for 12 oqualiz~ing the intcmal lubricant pressure in the motor assembly with the hydrostatic pressure 13 in casing 11. Seal section 77 mounts to the lower end of adapter 63. A
drive shaft 79 14 extends through seal section 7? and couples to the lower end of drive shaft extension 71, which may be considered a portion of drive shaft 79. Seal section 77 is secured to a gear 16 reducer 81. Gear reducer 81 is secured to the upper end of an electrical motor 83 as shown 17 in Figure iD. Motor 83 is preferably a three-phase electrical motor supplied with power 18 freer an electrical lint 85, Electrical line 85 extends alongside linear actuator 39 and is 19 strapped to the string of tubing 13. Alternately, motor 83 may be hydraulically driven. 'Ihe ZO outer diameter of motor 83, as well as seal section 77 and gear reducer 81, is larger than the Z 1 inner diameter of tubing 13.
22 In operation, once installed as shown in Figures lA iD, electrical power supplied to 23 motor 83 sauces drive shift 79 to relate rod d3 (Fig. 1B). ?his causes driver cage 47 to .:.: . ...,.. .....,: .._.., .. . ..;.. . .. -.
1 reciprocate up and down along with tube S1. ?ube 51 causes stem 37 (Fig. lA) to 2 reciprocate up and down, resulting is plunger 23 reciprocating up and down.
On each 3 dowasoolCe, ball 29 will move above scat 31, allowing well fluid to flow around ball 29 and 4 out discharge ports 27. On the upstroke, ball 29 will engage seat 31, pushing the column of fluid upward is tubing 13, with a portion flowing out the upper end of the well If it is necessary to remove pump 19 or linear actuator 39 for maintenance or 7 replacement, the operator lowers a retrieval tool (not shoran) an a wireline into engagement 8 retrieval member 35. The operator then pulls upward. This causes pump 19 to move 9 upward, bring along with it linear actuator 39. As shown in Figure 2, guide sleeve 61 and drive member 59, which serve as a connector between littcar actuator 39 and drive shaft 79, 11 will also move upward. Receptacle 65 will disengage from drive shaft coupling 72. Adapter 12 63 and the motor assembly will remain in the well secured to the string of tubing 13. ?he 13 remvainiag components are pulled to the suriaoe through tubing i3. A new yr repaired pump 14 19 or linear actuator 39 is lowered into the well on a retrieval tool.
Drive member 59 (Fig.
1 S 1B) will stab into engagement with coupling 72, reconnecting the well pump assembly for t6 operation.
17 For an initial installation, adapter 63, seal section 77, gear reducer 81 axed motor 83 18 may be connected to a string of tubing 13 and lowered into the well. Then, pump 19, izmer 19 actuator 39 and drive member 59 and guide slewe G 1 may be lowered through tubing 13 into engagement with the motor. Alternately, during the initial installation, the entire pump and 21 motor assecably could be connected at the surface to tubing 13 and lowered into the well as 22 a unit with the string of tubissg.
1 The invention has significant advantages. Specifically, advantages include the 2 elimination of sucker rod string that is coaamnnly used to actuate a recipracatirlg pump 3 assembly from the surface. The device eliminates depth limitations associated with 4 reciprocaring pumps The system of the iaveation eliminates rod. and tubing wear commonly associated with applications where wellbore deviation exists. The system does not suffer 5 from downhole tenaperatu~ree limitations like those imposed on a progressive cavity pump 7 type system used for low volume applicatioaa. T'he pump is actuated from the bottom end, 8 which reduces the o~cieney losses of the pump commonly caused by the prescace of a rod 9 sting in the tubing above the pump, 'The system of the invention elirniaates environmental risk associated with satf6ag box leakage on the surface. xn the system of the inv~tioa, the 11 pump may be n~ieved for repair or replacement without pulling the motor assembly. The 1 Z need for a workover rig to install or pull the pump assembly is eliminated.
t3 Although the invention is shown in only one of its forms, it should be apparent to 14 those skilled in the art that it is sot so limited,, but is suscepa'ble to various changes without departing from the scope of the invention, For example, the linear actuator could be 16 amnged to drive a hydraulic device, which then drives the reciprocating pump. This 17 hydraulic device operating in a way 9milar to a hydraulic jack, would increase the liR of the 18 electrical submersible pump system over that possible with just the linear actuator alone.
Claims (9)
1. A well pump assembly for use within a well having a string of conduit suspended within easing, the pump assembly comprising:
a motor assembly having a rotating drive shaft with a coupling on an upper end, the motor assembly adapted to be carried by the string of conduit below the string of conduit;
a reversing linear actuator adapted to be carried within the string of conduit, the linear actuator having a fast member that is rotated by the love shaft and a second member that does not rotate and moves linearly is response to rotation of the first member, one of the members being a tracked rod and the other of the members being a driver cage carried by the tracked and for rotational and linear movement relative to each other;
a lower connector adapted to be carried within the string of conduit, the lower connector having a coupling on a lower end that is adapted to stab into engagement with the coupling on the drive shaft, and an upper end that is secured to the first member;
a pump adapted to be carried within the string of conduit, the pump having a reciprocating plunger, as intake port for receiving well fluid, and a discharge port for discharging well fluid into the string of conduit;
an upper connector mounted between the second member and the plunger for reciprocating the plunger in response to linear movement of the second member;
and wherein the pump, linear actuator and upper and lower connector are retrievable through the string of conduit while the motor assembly remains suspended below the string of conduit.
a motor assembly having a rotating drive shaft with a coupling on an upper end, the motor assembly adapted to be carried by the string of conduit below the string of conduit;
a reversing linear actuator adapted to be carried within the string of conduit, the linear actuator having a fast member that is rotated by the love shaft and a second member that does not rotate and moves linearly is response to rotation of the first member, one of the members being a tracked rod and the other of the members being a driver cage carried by the tracked and for rotational and linear movement relative to each other;
a lower connector adapted to be carried within the string of conduit, the lower connector having a coupling on a lower end that is adapted to stab into engagement with the coupling on the drive shaft, and an upper end that is secured to the first member;
a pump adapted to be carried within the string of conduit, the pump having a reciprocating plunger, as intake port for receiving well fluid, and a discharge port for discharging well fluid into the string of conduit;
an upper connector mounted between the second member and the plunger for reciprocating the plunger in response to linear movement of the second member;
and wherein the pump, linear actuator and upper and lower connector are retrievable through the string of conduit while the motor assembly remains suspended below the string of conduit.
2. The well pump assembly according to claim 1, wherein the tracked rod has a plurality of helical grooves formed thereon, terminating in turn-around portions at upper and lower ends of the tracked rod; and the driver cage has a plurality of balls that roll within the grooves.
3. The well pump assembly according to claim 1, wherein the pump further comprises:
a valve that opens the intake port and blocks the discharge port when the plunger is stroked in one direction and blocks the intake port and opens the discharge port when the plunger is stroked in the other direction.
a valve that opens the intake port and blocks the discharge port when the plunger is stroked in one direction and blocks the intake port and opens the discharge port when the plunger is stroked in the other direction.
4. The well pump assembly according to claim 1, wherein the driver cage is the second member sad wherein the upper connector comprises:
a tube mounted to the driver cage for linear movement therewith, the tube enclosing a portion of the tracked rod; and a stem mounted between the tube and the plunger.
a tube mounted to the driver cage for linear movement therewith, the tube enclosing a portion of the tracked rod; and a stem mounted between the tube and the plunger.
5. The well pump assembly according to claim 1 wherein motor assembly has a maximum outer diameter that is greater than a maximum diameter of the pump.
6. The well pump assembly according to claim 1, further comprising:
a tubular adapter at the upper end of the motor assembly, the adapter having a bore and an antirotation key located therein; and wherein the lower connector comprises a guide sleeve that inserts into the bore of the adapter, and a drive member rotatably carried in the guide sleeve for rotation by the drive shaft, the guide sleeve having a slot that engages the key to prevent rotation of the guide sleeve.
a tubular adapter at the upper end of the motor assembly, the adapter having a bore and an antirotation key located therein; and wherein the lower connector comprises a guide sleeve that inserts into the bore of the adapter, and a drive member rotatably carried in the guide sleeve for rotation by the drive shaft, the guide sleeve having a slot that engages the key to prevent rotation of the guide sleeve.
7. The well pump assembly according to claim 1, further comprising:
a tubular adapter secured to the upper end of the motor assembly, the adapter having a bore and an antirotation key located therein; wherein the lower connector comprises a guide sleeve and a drive member rotatably carried therein for rotation by the drive shaft, the guide sleeve being insertable into the bore of the adapter and having a slot that engages the key to prevent rotation of the guide sleeve; and wherein the linear actuator feather comprises a housing having a lower end secured to the guide sleeve and an upper end secured to the pump.
a tubular adapter secured to the upper end of the motor assembly, the adapter having a bore and an antirotation key located therein; wherein the lower connector comprises a guide sleeve and a drive member rotatably carried therein for rotation by the drive shaft, the guide sleeve being insertable into the bore of the adapter and having a slot that engages the key to prevent rotation of the guide sleeve; and wherein the linear actuator feather comprises a housing having a lower end secured to the guide sleeve and an upper end secured to the pump.
8. The well pump assembly according to claim 1 further comprising:
a gear reduces connected between the linear actuator and the motor for reducing the speed of rotation of the drive shaft.
a gear reduces connected between the linear actuator and the motor for reducing the speed of rotation of the drive shaft.
9. The well pump assembly according to claim 1, further comprising:
a retrieval member mounted to an upper end of the pump for engagement by a retrieval tool lowered on a line through the string of conduit.
18. The well pump assembly according to claim 1, further comprising:
a line extending from the motor assembly alongside the string of conduit to a top of the well for supplying power to the motor assembly.
11. A well pump assembly for use within a well having a string of tubing suspended within casing, the well pip assembly comprising:
a pump having a cylinder and a reciprocating plunges located therein, the cylinder and the plunger adapted to be located within the string of tubing, a motor assembly having a rotating drive shaft with a coupling on an upper end;
an adapter secured to the upper sad of the motor assembly and adapted to be connected to a lower end of the string of tubing to support the motor assembly below the suing of tubing, the adapter having a bore with the coupling being located in the bore;
a housing assembly extending between the adapter assembly and the pump and adapted to be located within the string of tubing;
a reversing linear actuator positioned in the housing assembly, the linear actuator having a tracked rod that is coupled to the drive shaft of the motor sad a nonrotating driver cage mounted to the tracked rod that reciprocates linearly in opposite directions relative to the tracked rod and the housing assembly in response to rotation of the tracked rod;
a lower connector mounted to the tracked rod for rotating the tracked rod, the lower connector being insertable into the bore of the adapter and having a coupling on a lower end for stabbing into engagement with the coupling on the upper end of the drive shaft;
an upper connector mounted between the driver cage and the plunger for reciprocating the plunger in response to linear movement of the driver cage;
as intake port in the pump for admitting well fluid from outside the string of tubing to the cylinder;
a discharge port in the pump for discharging well fluid from the cylinder into the string of tubing;
a check valve mounted to the intake end discharge ports that opens the intake port and blocks the discharge port when flee plunger is stroked is a first direction to admit well fluid from outside the string of tubing to the cylinder and blocks the intake port and opens the discharge port whey the plunger is stroked in a second direction to discharge well fluid from the cylinder into the string of tubing; and wherein the pump, housing assembly, linear actuator, and upper and lower connectors are retrievable within the string of tubing while the motor assembly remains below the string of tubing.
12. The well pump assembly according to claim 11, wherein:
the adapter has an antirotation key located within the bore; and the lower connector comprises a guide sleeve that inserts into the bore of the adapter, the lower connector having a drive member rotatably carried is the guide sleeve for rotation by the drive shag, the guide sleeve having a slot that engages the key to prevent rotation of the sleeve.
13. The well pump assembly according to claim 11, wherein the tracked rod has a plurality of helical grooves formed thereon, terminating in turn-around portions at upper and lower ends of the tracked rod; and the driver cage has a plurality of balls that roll within the grooves.
14. The well pump assembly according to claim 11, wherein the upper connector comprises:
a tube mounted to the driver cage for linear movement therewith, the tube enclosing a portion of the tracked rod; and a stem mounted between the tube and the plunger.
15. The well according to claim 11 further comprising:
a gear reducer connected between the tracked rod and the motor for reducing the speed of rotation of the drive shaft.
16. The well pump assembly according to claim 11, further comprising:
a retrieval member mounted to an upper end of the pump for engagement by a retrieval tool lowered on a line through the string of conduit.
17. The well pump assembly according to claim 11, further comprising:
a line extending from the motor assembly alongside the string of tubing to a top of the well for supplying power to the motor assembly.
18. A method of pumping wall fluids comprising the steps of:
securing a motor assembly on a string of conduit and lowering the conduit into the well, the motor assembly having a drive abaft with s coupling on as upper end;
then lowering a pump assembly through the conduit, the pump assembly having a pump with a reciprocating plunger, a reversing linear actuator positioned below the plunger, and a connector mounted below the linear actuator, the linear actuator having fast and second members, wherein rotation of the first member causes the second member to reciprocally move in linear directions relative to the first member, the second member being connected to the plunger, the first member being connected to a connector having a coupling on a lower end; then stabbing the coupling of the connector into engagement with the coupling of the drive shaft; then supplying power to the motor to cause the first member to rotate, thereby causing the second member to stroke the plunger in fast and second directions;
admitting well fluid into the pump upon each stroke of the plunger is the first direction; and discharging well fluid from the pump into the conduit upon each stroke of the plunger in the second direction.
19. The method according to claim 18, further comprising:
pulling upward on the pump, and retrieving the pump, linear actuator and connector through the conduit while leaving the motor and conduit in the well.
a retrieval member mounted to an upper end of the pump for engagement by a retrieval tool lowered on a line through the string of conduit.
18. The well pump assembly according to claim 1, further comprising:
a line extending from the motor assembly alongside the string of conduit to a top of the well for supplying power to the motor assembly.
11. A well pump assembly for use within a well having a string of tubing suspended within casing, the well pip assembly comprising:
a pump having a cylinder and a reciprocating plunges located therein, the cylinder and the plunger adapted to be located within the string of tubing, a motor assembly having a rotating drive shaft with a coupling on an upper end;
an adapter secured to the upper sad of the motor assembly and adapted to be connected to a lower end of the string of tubing to support the motor assembly below the suing of tubing, the adapter having a bore with the coupling being located in the bore;
a housing assembly extending between the adapter assembly and the pump and adapted to be located within the string of tubing;
a reversing linear actuator positioned in the housing assembly, the linear actuator having a tracked rod that is coupled to the drive shaft of the motor sad a nonrotating driver cage mounted to the tracked rod that reciprocates linearly in opposite directions relative to the tracked rod and the housing assembly in response to rotation of the tracked rod;
a lower connector mounted to the tracked rod for rotating the tracked rod, the lower connector being insertable into the bore of the adapter and having a coupling on a lower end for stabbing into engagement with the coupling on the upper end of the drive shaft;
an upper connector mounted between the driver cage and the plunger for reciprocating the plunger in response to linear movement of the driver cage;
as intake port in the pump for admitting well fluid from outside the string of tubing to the cylinder;
a discharge port in the pump for discharging well fluid from the cylinder into the string of tubing;
a check valve mounted to the intake end discharge ports that opens the intake port and blocks the discharge port when flee plunger is stroked is a first direction to admit well fluid from outside the string of tubing to the cylinder and blocks the intake port and opens the discharge port whey the plunger is stroked in a second direction to discharge well fluid from the cylinder into the string of tubing; and wherein the pump, housing assembly, linear actuator, and upper and lower connectors are retrievable within the string of tubing while the motor assembly remains below the string of tubing.
12. The well pump assembly according to claim 11, wherein:
the adapter has an antirotation key located within the bore; and the lower connector comprises a guide sleeve that inserts into the bore of the adapter, the lower connector having a drive member rotatably carried is the guide sleeve for rotation by the drive shag, the guide sleeve having a slot that engages the key to prevent rotation of the sleeve.
13. The well pump assembly according to claim 11, wherein the tracked rod has a plurality of helical grooves formed thereon, terminating in turn-around portions at upper and lower ends of the tracked rod; and the driver cage has a plurality of balls that roll within the grooves.
14. The well pump assembly according to claim 11, wherein the upper connector comprises:
a tube mounted to the driver cage for linear movement therewith, the tube enclosing a portion of the tracked rod; and a stem mounted between the tube and the plunger.
15. The well according to claim 11 further comprising:
a gear reducer connected between the tracked rod and the motor for reducing the speed of rotation of the drive shaft.
16. The well pump assembly according to claim 11, further comprising:
a retrieval member mounted to an upper end of the pump for engagement by a retrieval tool lowered on a line through the string of conduit.
17. The well pump assembly according to claim 11, further comprising:
a line extending from the motor assembly alongside the string of tubing to a top of the well for supplying power to the motor assembly.
18. A method of pumping wall fluids comprising the steps of:
securing a motor assembly on a string of conduit and lowering the conduit into the well, the motor assembly having a drive abaft with s coupling on as upper end;
then lowering a pump assembly through the conduit, the pump assembly having a pump with a reciprocating plunger, a reversing linear actuator positioned below the plunger, and a connector mounted below the linear actuator, the linear actuator having fast and second members, wherein rotation of the first member causes the second member to reciprocally move in linear directions relative to the first member, the second member being connected to the plunger, the first member being connected to a connector having a coupling on a lower end; then stabbing the coupling of the connector into engagement with the coupling of the drive shaft; then supplying power to the motor to cause the first member to rotate, thereby causing the second member to stroke the plunger in fast and second directions;
admitting well fluid into the pump upon each stroke of the plunger is the first direction; and discharging well fluid from the pump into the conduit upon each stroke of the plunger in the second direction.
19. The method according to claim 18, further comprising:
pulling upward on the pump, and retrieving the pump, linear actuator and connector through the conduit while leaving the motor and conduit in the well.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10425898P | 1998-10-14 | 1998-10-14 | |
| US60/104,258 | 1998-10-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2286502A1 true CA2286502A1 (en) | 2000-04-14 |
Family
ID=31713911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2286502 Abandoned CA2286502A1 (en) | 1998-10-14 | 1999-10-14 | Submersibly driven reciprocating pump |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2286502A1 (en) |
-
1999
- 1999-10-14 CA CA 2286502 patent/CA2286502A1/en not_active Abandoned
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| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |