CA2209803A1 - Hydraulically driven oil well pump - Google Patents
Hydraulically driven oil well pumpInfo
- Publication number
- CA2209803A1 CA2209803A1 CA002209803A CA2209803A CA2209803A1 CA 2209803 A1 CA2209803 A1 CA 2209803A1 CA 002209803 A CA002209803 A CA 002209803A CA 2209803 A CA2209803 A CA 2209803A CA 2209803 A1 CA2209803 A1 CA 2209803A1
- Authority
- CA
- Canada
- Prior art keywords
- motor
- pump
- return
- supply
- well
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 239000003129 oil well Substances 0.000 title description 4
- 238000004519 manufacturing process Methods 0.000 claims abstract description 37
- 239000012530 fluid Substances 0.000 claims abstract description 35
- 230000008878 coupling Effects 0.000 claims description 8
- 238000010168 coupling process Methods 0.000 claims description 8
- 238000005859 coupling reaction Methods 0.000 claims description 8
- 238000005086 pumping Methods 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/04—Units comprising pumps and their driving means the pump being fluid driven
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Earth Drilling (AREA)
Abstract
A down hole rotary pump in a well is driven by a down hole hydraulic motor. The motor is mounted in the production string using a motor mount. The motor mount is ported to allow the flow of produced fluid past the motor and through the mount to the production tubing above the motor. This arrangement eliminates the sucker rod drive that causes power loss and tubing wear and mitigates problems in completing directional and deviated wells.
Description
.
HYDRAULICALLY DRIVEN OIL WELL PUMP
The present invention relates to the production of liquid from wells and more particularly to the driving of a rotary production pump in a well.
The invention has particular application to oil wells and will be described in connection with that application. It is to be understood, however, that the invention is not limited to that application.
Production pumps used in oil wells are conventionally driven by a motor at the surface, through a sucker rod extending along the well. This has a number of disadvantages, including the significant wear caused by rubbing of thesucker rod on the production tubing. This problem is especially severe in directional or horizontal wells.
The present invention is concerned with an alternative drive system that will eliminate the sucker rod drive.
According to one aspect of the present invention there is provided a pump system for a well having a well bore extending into the ground from a well head, said system comprising:
a rotary pump in the well bore for pumping fluid up the well bore, to the well head;
an hydraulic motor in the well bore, adjacent the rotary pump, the motor having hydraulic fluid supply and return ports;
coupling means coupling the hydraulic motor to the pump for operating the pump;
an hydraulic fluid supply line extending along the well bore from the well head and coupled to the hydraulic fluid supply port of the motor;
an hydraulic fluid return line extending along the well bore from the well head and coupled to the hydraulic fluid return port of the motor; and pump means at the well head for delivering hydraulic fluid under pressure to the hydraulic fluid supply line and for receiving hydraulic fluid from the hydraulic fluid return line.
The invention thus uses a down hole hydraulic motor for driving a rotary pump. This eliminates the friction involved in a sucker rod drive, with consequent reduction of power losses and elimination of tubing wear.
According to another aspect of the present invention there is 10 provided a motor assembly for operating a rotary pump in a well, the motor assembly comprising:
an hydraulic motor with a supply port and a return port and drive means for driving a pump rotor;
a tubular motor casing with coupling means at each end for 15 connecting the motor casing into a production tubing string in the well;
a motor mount mounted on the motor and mounted in the motor casing, the mount having:
production fluid passages therethrough for delivering fluid along the production tubing string past the motor mount, and supply and return passages through the mount communicating with the supply and return ports respectively of the motor.
The present invention eliminates rod failures and rod induced tubing failures, and thus reduces the frequency with which pumps must be pulled and replaced. Production problems with directional wells or wells with severe dog 25 legs are mitigated. The production pump can even be laid in a horizontal section of a well. By eliminating the sucker rod, rotary pumps can be used at greater depths.
Most standard well head equipment can be used with the present system so that the system may be installed quickly and at reasonable cost.
When coiled tubing units are used for installing the pump, a number of advantages are achieved. Fewer people are on location than in conventional field operations, thus providing safer and more economic operations. Service rigs and accessories are eliminated so that the system is more suitable for use in environmentally sensitive areas, for example irrigated farm properties and 10 government land. The reduced quantity and size of the surface insulation makes the system visually less obtrusive than prior art systems. The cost of abandonment is reduced because of the smaller, lighter and less intrusive surface equipment.
Where desired, a line heater can be installed to heat the hydraulic 15 supply oil prior to injection. This heats the produced fluid to eliminate wax formation or to thin heavy oil.
The present system allows the pumps to be automatically controlled to eliminate dry running of the pump, thus reducing wear. Control of the pump can be carried out remotely.
In the accompanying drawings, which illustrate exemplary embodiments of the present invention:
Figure 1 is an illustration of a well installation according to the present invention;
Figure 2 is a detail view, partially broken away showing the pump 25 driver section of the installation;
Figure 3 is an end view of a motor mount;
- Figure 4 is the opposite end view of the motor mount; and Figure 5 is a cross section along line 5-5 of Figures 3 and 4.
Referring to the accompanying drawings, Figure 1 illustrates a well system 10 including a well bore 12 lined with a production casing 14. The bore 5 extends into the ground into a production formation 16 in the usual way.
A conventional rotary production pump 18 is installed in the production casing. This includes a stator 20 and a rotor 22. Immediately above the pump in the well is the pump driver 24. This includes a driver casing 26 connected to the stator 20 of the pump and to production tubing 28 extending 10 along the production casing from the pump driver.
Concentrically within the production tubing 28 is an hydraulic fluid return tubing string 30. Within the return tubing 30 is an hydraulic supply tubing string 32. The production tubing 28, return tubing 30 and supply tubing 32 all extend with the production casing 14 to a well head 34 which includes a surface 15 casing 36 around the production casing.
At the top of the well, the gas coming up the annulus between the production casing and the production tubing is vented through the well head by gas vent 38.
The production tubing is hung in slips in a dog nut 40 to hold the 20 pump at the desired height. The production tubing is cut off just above the slips, allowing the production fluid to be delivered from the well head body through a valve 42. The area between the production tubing and the well head is sealed by a pack off to prevent leaks around the tubing from the well head. The hydraulic fluid supply and return tubings extend through the bonnet 44. They are 25 connected to a surface hydraulic pump 46 to supply the down hole power unit with the oil required to drive it in a closed loop system. Figure 1 also illustrates an optional iine heater 48 for heating the hydraulic fluid entering the supply tubing .
As iliustrated in Figure 2, the pump driver casing includes a tubular housing section 49 with a thread 50 at its bottom end screwed onto the end of a 5 tube section 52. The bottom end of the tube section 52 is in turn threaded into the top of the pump stator 20. At its top end, the motor housing 49 has a threaded counter bore 56 ending at a land 58. The upper end of this counter bore is threaded onto the bottom end of a cross-over that is screwed into the bottom end of the production tubing string.
Inside the pump driver assembly is a drive shaft 62 with two constant velocity joints 64. This is connected at the bottom end to the pump rotor 22 and at the end top end to the output shaft 66 of an hydraulic motor 68.The motor is a small diameter, high displacement orbital motor delivering high torque at low speed. The motor has a supply port and a return port at the end ofthe motor opposite the drive shaft 66.
The upper end of the motor is coupled to a motor mount 74 including a cylindrical mounting block 76 that engages the upper end of the motor and a larger diameter head 78 that screws into the counter bore 56 at the upper end ofthe motor housing.
As illustrated most particularly in Figures 3, 4 and 5, there is a center blind bore 80 extending into the upper end of the mount 74. This is threaded to receive the bottom end of the hydraulic supply tubing 32. The bore 80 has a threaded counter bore 82 that is connected to the bottom end of the hydraulic return tubing 30. A supply passage 84 through the mount 74 leads from the end of the center bore 80 to the supply port of the motor. Similarly, a return passage 86 in the mount leads from the counter bore 82 to the return port of the motor.
To allow production fluid to pass along the production tubing string from the pump, past the motor and motor mount, a series of oval ports 88 extend through the mount to provide as rnuch flow cross section as possible.
While one particular embodiment of the present invention has been 5 described in the foregoing, it is to be understood that other embodiments are possible within the scope of the invention and are intended to be included herein.
The invention is to be considered limited solely by the scope of the appended claims.
HYDRAULICALLY DRIVEN OIL WELL PUMP
The present invention relates to the production of liquid from wells and more particularly to the driving of a rotary production pump in a well.
The invention has particular application to oil wells and will be described in connection with that application. It is to be understood, however, that the invention is not limited to that application.
Production pumps used in oil wells are conventionally driven by a motor at the surface, through a sucker rod extending along the well. This has a number of disadvantages, including the significant wear caused by rubbing of thesucker rod on the production tubing. This problem is especially severe in directional or horizontal wells.
The present invention is concerned with an alternative drive system that will eliminate the sucker rod drive.
According to one aspect of the present invention there is provided a pump system for a well having a well bore extending into the ground from a well head, said system comprising:
a rotary pump in the well bore for pumping fluid up the well bore, to the well head;
an hydraulic motor in the well bore, adjacent the rotary pump, the motor having hydraulic fluid supply and return ports;
coupling means coupling the hydraulic motor to the pump for operating the pump;
an hydraulic fluid supply line extending along the well bore from the well head and coupled to the hydraulic fluid supply port of the motor;
an hydraulic fluid return line extending along the well bore from the well head and coupled to the hydraulic fluid return port of the motor; and pump means at the well head for delivering hydraulic fluid under pressure to the hydraulic fluid supply line and for receiving hydraulic fluid from the hydraulic fluid return line.
The invention thus uses a down hole hydraulic motor for driving a rotary pump. This eliminates the friction involved in a sucker rod drive, with consequent reduction of power losses and elimination of tubing wear.
According to another aspect of the present invention there is 10 provided a motor assembly for operating a rotary pump in a well, the motor assembly comprising:
an hydraulic motor with a supply port and a return port and drive means for driving a pump rotor;
a tubular motor casing with coupling means at each end for 15 connecting the motor casing into a production tubing string in the well;
a motor mount mounted on the motor and mounted in the motor casing, the mount having:
production fluid passages therethrough for delivering fluid along the production tubing string past the motor mount, and supply and return passages through the mount communicating with the supply and return ports respectively of the motor.
The present invention eliminates rod failures and rod induced tubing failures, and thus reduces the frequency with which pumps must be pulled and replaced. Production problems with directional wells or wells with severe dog 25 legs are mitigated. The production pump can even be laid in a horizontal section of a well. By eliminating the sucker rod, rotary pumps can be used at greater depths.
Most standard well head equipment can be used with the present system so that the system may be installed quickly and at reasonable cost.
When coiled tubing units are used for installing the pump, a number of advantages are achieved. Fewer people are on location than in conventional field operations, thus providing safer and more economic operations. Service rigs and accessories are eliminated so that the system is more suitable for use in environmentally sensitive areas, for example irrigated farm properties and 10 government land. The reduced quantity and size of the surface insulation makes the system visually less obtrusive than prior art systems. The cost of abandonment is reduced because of the smaller, lighter and less intrusive surface equipment.
Where desired, a line heater can be installed to heat the hydraulic 15 supply oil prior to injection. This heats the produced fluid to eliminate wax formation or to thin heavy oil.
The present system allows the pumps to be automatically controlled to eliminate dry running of the pump, thus reducing wear. Control of the pump can be carried out remotely.
In the accompanying drawings, which illustrate exemplary embodiments of the present invention:
Figure 1 is an illustration of a well installation according to the present invention;
Figure 2 is a detail view, partially broken away showing the pump 25 driver section of the installation;
Figure 3 is an end view of a motor mount;
- Figure 4 is the opposite end view of the motor mount; and Figure 5 is a cross section along line 5-5 of Figures 3 and 4.
Referring to the accompanying drawings, Figure 1 illustrates a well system 10 including a well bore 12 lined with a production casing 14. The bore 5 extends into the ground into a production formation 16 in the usual way.
A conventional rotary production pump 18 is installed in the production casing. This includes a stator 20 and a rotor 22. Immediately above the pump in the well is the pump driver 24. This includes a driver casing 26 connected to the stator 20 of the pump and to production tubing 28 extending 10 along the production casing from the pump driver.
Concentrically within the production tubing 28 is an hydraulic fluid return tubing string 30. Within the return tubing 30 is an hydraulic supply tubing string 32. The production tubing 28, return tubing 30 and supply tubing 32 all extend with the production casing 14 to a well head 34 which includes a surface 15 casing 36 around the production casing.
At the top of the well, the gas coming up the annulus between the production casing and the production tubing is vented through the well head by gas vent 38.
The production tubing is hung in slips in a dog nut 40 to hold the 20 pump at the desired height. The production tubing is cut off just above the slips, allowing the production fluid to be delivered from the well head body through a valve 42. The area between the production tubing and the well head is sealed by a pack off to prevent leaks around the tubing from the well head. The hydraulic fluid supply and return tubings extend through the bonnet 44. They are 25 connected to a surface hydraulic pump 46 to supply the down hole power unit with the oil required to drive it in a closed loop system. Figure 1 also illustrates an optional iine heater 48 for heating the hydraulic fluid entering the supply tubing .
As iliustrated in Figure 2, the pump driver casing includes a tubular housing section 49 with a thread 50 at its bottom end screwed onto the end of a 5 tube section 52. The bottom end of the tube section 52 is in turn threaded into the top of the pump stator 20. At its top end, the motor housing 49 has a threaded counter bore 56 ending at a land 58. The upper end of this counter bore is threaded onto the bottom end of a cross-over that is screwed into the bottom end of the production tubing string.
Inside the pump driver assembly is a drive shaft 62 with two constant velocity joints 64. This is connected at the bottom end to the pump rotor 22 and at the end top end to the output shaft 66 of an hydraulic motor 68.The motor is a small diameter, high displacement orbital motor delivering high torque at low speed. The motor has a supply port and a return port at the end ofthe motor opposite the drive shaft 66.
The upper end of the motor is coupled to a motor mount 74 including a cylindrical mounting block 76 that engages the upper end of the motor and a larger diameter head 78 that screws into the counter bore 56 at the upper end ofthe motor housing.
As illustrated most particularly in Figures 3, 4 and 5, there is a center blind bore 80 extending into the upper end of the mount 74. This is threaded to receive the bottom end of the hydraulic supply tubing 32. The bore 80 has a threaded counter bore 82 that is connected to the bottom end of the hydraulic return tubing 30. A supply passage 84 through the mount 74 leads from the end of the center bore 80 to the supply port of the motor. Similarly, a return passage 86 in the mount leads from the counter bore 82 to the return port of the motor.
To allow production fluid to pass along the production tubing string from the pump, past the motor and motor mount, a series of oval ports 88 extend through the mount to provide as rnuch flow cross section as possible.
While one particular embodiment of the present invention has been 5 described in the foregoing, it is to be understood that other embodiments are possible within the scope of the invention and are intended to be included herein.
The invention is to be considered limited solely by the scope of the appended claims.
Claims (10)
1. A pump system for a well having a well bore extending into the ground from a well head, said system comprising:
a rotary pump in the well bore for pumping fluid up the well bore, to the well head;
an hydraulic motor in the well bore, adjacent the rotary pump, the motor having hydraulic fluid supply and return ports;
coupling means coupling the hydraulic motor to the pump for operating the pump;
an hydraulic fluid supply line extending along the well bore from the well head and coupled to the hydraulic fluid supply port of the motor;
an hydraulic fluid return line extending along the well bore from the well head and coupled to the hydraulic fluid return port of the motor; and pump means at the well head for delivering hydraulic fluid under pressure to the hydraulic fluid supply line and for receiving hydraulic fluid from the hydraulic fluid return line.
a rotary pump in the well bore for pumping fluid up the well bore, to the well head;
an hydraulic motor in the well bore, adjacent the rotary pump, the motor having hydraulic fluid supply and return ports;
coupling means coupling the hydraulic motor to the pump for operating the pump;
an hydraulic fluid supply line extending along the well bore from the well head and coupled to the hydraulic fluid supply port of the motor;
an hydraulic fluid return line extending along the well bore from the well head and coupled to the hydraulic fluid return port of the motor; and pump means at the well head for delivering hydraulic fluid under pressure to the hydraulic fluid supply line and for receiving hydraulic fluid from the hydraulic fluid return line.
2. A system according to Claim 1 wherein the well includes a production tubing string coupled to the pump for delivering fluid from the pump to the well head and the pump drive system includes a motor mount mounting the hydraulic motor in the production tubing and fluid passage means through the motor mount for passing fluid along the production tubing string from below the motor mount to above the motor mount.
3. A system according to Claim 2 wherein the motor mount comprises a mounting block secured to an upper end of the motor, a supply passage connecting the supply line to the supply port of the motor and a return passage connecting the return line to the return port of the motor.
4. A system according to Claim 3 wherein the supply and return lines are concentric.
5. A system according to Claim 2, 3 or 4 wherein the fluid passage means comprise ports through the motor mount.
6. A system according to any one of Claims 1 through 5 wherein the production string comprises coiled tubing.
7. A system according to any preceding Claim wherein the coupling means comprise a drive shaft assembly coupling the hydraulic motor to the pump;
8. A motor assembly for operating a rotary pump in a well, the motor assembly comprising:
an hydraulic motor with a supply port and a return port and drive means for driving a pump rotor;
a tubular motor casing with coupling means at each end for connecting the motor casing into a production tubing string in the well;
a motor mount mounted on the motor and mounted in the motor casing, the mount having:
production fluid passages therethrough for delivering fluid along the production tubing string past the motor mount, and supply and return passages through the mount communicating with the supply and return ports respectively of the motor.
an hydraulic motor with a supply port and a return port and drive means for driving a pump rotor;
a tubular motor casing with coupling means at each end for connecting the motor casing into a production tubing string in the well;
a motor mount mounted on the motor and mounted in the motor casing, the mount having:
production fluid passages therethrough for delivering fluid along the production tubing string past the motor mount, and supply and return passages through the mount communicating with the supply and return ports respectively of the motor.
9. An assembly according to Claim 8 wherein the motor mount comprises a mounting block, a supply passage connecting the supply line to the supply port of the motor and a return passage connecting the return line to the return passage of the motor.
10. An assembly according to Claim 9 wherein the supply and return lines are concentric.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002209803A CA2209803A1 (en) | 1997-07-04 | 1997-07-04 | Hydraulically driven oil well pump |
| AU80983/98A AU8098398A (en) | 1997-07-04 | 1998-07-03 | Hydraulically driven oil well pump |
| PCT/CA1998/000635 WO1999001667A1 (en) | 1997-07-04 | 1998-07-03 | Hydraulically driven oil well pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002209803A CA2209803A1 (en) | 1997-07-04 | 1997-07-04 | Hydraulically driven oil well pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2209803A1 true CA2209803A1 (en) | 1997-08-04 |
Family
ID=4161018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002209803A Abandoned CA2209803A1 (en) | 1997-07-04 | 1997-07-04 | Hydraulically driven oil well pump |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2209803A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6004114A (en) * | 1998-02-13 | 1999-12-21 | Cunningham; Edmund C. | Hydraulic submersible pump for oil well production |
-
1997
- 1997-07-04 CA CA002209803A patent/CA2209803A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6004114A (en) * | 1998-02-13 | 1999-12-21 | Cunningham; Edmund C. | Hydraulic submersible pump for oil well production |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |