CN111287714B - Lifting device and method for well fluid - Google Patents
Lifting device and method for well fluid Download PDFInfo
- Publication number
- CN111287714B CN111287714B CN201811507304.1A CN201811507304A CN111287714B CN 111287714 B CN111287714 B CN 111287714B CN 201811507304 A CN201811507304 A CN 201811507304A CN 111287714 B CN111287714 B CN 111287714B
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- leather bag
- liquid inlet
- nipple
- inlet valve
- valve
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- 239000012530 fluid Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000010985 leather Substances 0.000 claims abstract description 174
- 239000007788 liquid Substances 0.000 claims abstract description 135
- 210000002445 nipple Anatomy 0.000 claims abstract description 74
- 238000004519 manufacturing process Methods 0.000 claims abstract description 23
- 230000002457 bidirectional effect Effects 0.000 claims description 49
- 239000003921 oil Substances 0.000 claims description 48
- 230000007246 mechanism Effects 0.000 claims description 17
- 239000010720 hydraulic oil Substances 0.000 claims description 11
- 239000010687 lubricating oil Substances 0.000 claims description 10
- 238000009434 installation Methods 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 6
- 239000004576 sand Substances 0.000 abstract description 11
- 238000005260 corrosion Methods 0.000 abstract description 7
- 230000007797 corrosion Effects 0.000 abstract description 7
- 239000003129 oil well Substances 0.000 abstract description 6
- 238000007599 discharging Methods 0.000 abstract 1
- 238000005299 abrasion Methods 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 4
- 239000011229 interlayer Substances 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 210000002919 epithelial cell Anatomy 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- 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
- E21B43/129—Adaptations of down-hole pump systems powered by fluid supplied from outside the borehole
-
- 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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/08—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
Abstract
The application discloses a well fluid lifting device and a well fluid lifting method. One is: when the lower leather bag is contracted, the well fluid enters the production pipe column through the lower pipe column liquid inlet valve; when the lower leather bag is enlarged, the lower liquid discharging valve is used for entering a closed annular space formed by the tight connection of the upper nipple, the upper pipe column liquid inlet valve and the lower pipe column liquid inlet valve, and then the closed annular space enters the pipe column through the pipe column liquid inlet hole. And the second is: when the upper leather bag is contracted, well fluid enters an upper pipe column liquid inlet valve and then enters an upper leather bag pup joint along an upper pipe column liquid inlet channel; when the epithelial pocket is enlarged, the produced fluid is squeezed from the upper drainage valve to the upper tubular string. When the oil well internal liquid is applied, the liquid only contacts with the outer surface of the leather bag, the outside of the motor, the outside of the gear pump and the like, and does not enter important moving parts such as the gear pump and the like, so that the influence of oil well corrosion sand production on liquid production equipment is thoroughly avoided.
Description
Technical Field
The application relates to the technical field of oil extraction in the petroleum industry, in particular to a well fluid lifting device and a well fluid lifting method.
Background
The sand production of an oil well is one of the important problems which prevent the normal production of the oil well, and for a common plunger pump, the production problems and safety accidents such as sand blocking of an oil pump, plunger abrasion, the phenomenon that the oil pump is turned over due to the sand blocking of the oil pump are easy to cause; for the screw pump, the well is easy to lie due to sand clamping; for an electric submersible pump, abrasion of unit components and even sand blocking can be caused, and the service life of the unit is influenced. In addition, formation fluids are mostly highly corrosive, and corrosion caused by direct contact of critical working components of various pumps with the formation fluids results in reduced pump operating efficiency. The conventional method adopts various sand prevention and corrosion prevention methods such as pump body plating, sand prevention groove opening, corrosion inhibitor adding and the like, and has a certain effect, but the moving parts of the pump still generate abrasion and corrosion conditions due to direct contact with stratum liquid.
Application number: 201610671913.5A continuous bidirectional lifting oil pump is characterized by comprising an inner cavity and an outer cavity, wherein the oil pump forms an inner space positioned in the inner cavity and an interlayer space positioned between the inner cavity and the outer cavity; the top of the inner cavity is provided with a top seal, a piston which divides the inner space into an upper space and a lower space is arranged in the inner cavity, and the sucker rod passes through the top seal and is connected with the piston; the bottoms of the inner cavity and the outer cavity are provided with end covers, the end covers are provided with lower pump body oil inlet valves which are communicated with the lower space, lower pump body oil outlet valves which are communicated with the interlayer space are arranged below the side wall of the inner cavity, upper pump body oil outlet valves which are communicated with the interlayer space are arranged above the side wall of the inner cavity, and upper pump body oil inlet valves which are communicated with the upper space are arranged above the side wall of the outer cavity; the lower pump body oil inlet valve, the lower pump body oil outlet valve, the upper pump body oil outlet valve and the upper pump body oil inlet valve are all check valves. The application can realize oil pumping in the up stroke and the down stroke and improve the working efficiency.
Compared with the application, the disclosed technology is different in overall technical scheme, application purpose, application effect and the like, and does not have any technical teaching.
Disclosure of Invention
The application aims to provide a lifting device and a lifting method for well fluid, which utilize forward rotation and reverse rotation of a bidirectional gear pump to push lubricating oil (or hydraulic oil) to flow between an upper leather bag and a lower leather bag so as to enable the upper leather bag and the lower leather bag to be alternately expanded and contracted, thereby enabling the pressure in a pipe column above the gear pump and the pressure in the pipe column below the gear pump to be alternately increased and decreased; because the device is provided with two sets of valves, liquid in the formation can enter the production string whether the lower bladder is enlarged or contracted. The gear pump continuously rotates positively and reversely, the leather bags are alternately increased and decreased, and the liquid in the stratum continuously enters the production pipe column until the liquid is lifted to the ground. In the process, the liquid in the well only contacts with the outer surface of the leather bag, the outside of the motor, the outside of the gear pump and the like, and does not enter important moving parts such as the gear pump and the like, so that the influence of corrosion of the oil well and sand production on liquid production equipment is thoroughly avoided.
In order to achieve the above purpose, the application adopts the following technical scheme that the well fluid lifting device comprises an outer tube, a bidirectional driving lifting mechanism, an upper nipple, an upper tubular column liquid inlet valve, a lower tubular column liquid inlet valve, an upper liquid discharge valve and a lower liquid discharge valve, wherein the upper nipple is arranged in an upper nipple mounting hole formed at the upper end of the outer tube, the upper tubular column liquid inlet valve is arranged in an upper tubular column liquid inlet valve mounting hole formed at the lower end of the outer tube, the lower tubular column liquid inlet valve is arranged in a lower tubular column liquid inlet valve mounting hole formed at the lower end of the outer tube, the bidirectional driving lifting mechanism is integrally arranged in the outer tube, the upper end of the bidirectional driving lifting mechanism is connected with a lower port of the upper nipple through the upper liquid discharge valve, an outlet of the upper tubular column liquid inlet valve is communicated with an inner cavity at the upper end of the bidirectional driving lifting mechanism through an upper tubular column liquid inlet channel, the outlet of the lower tubular column liquid inlet valve is communicated with an inner cavity at the lower end of the bidirectional driving lifting mechanism through a lower liquid inlet channel, the lower tubular column liquid inlet channel is formed in a bypass passage is formed at the lower tubular column liquid inlet valve mounting hole, the lower liquid outlet is communicated with an inner cavity at the lower liquid discharge valve outlet of the upper nipple through the upper pipe liquid outlet hole, and the tubular column liquid outlet is communicated with the inner cavity at the upper pipe outlet through the lower liquid outlet pipe.
The bidirectional driving lifting mechanism comprises a bidirectional motor, a bidirectional gear pump, a middle nipple, an upper leather bag nipple, a lower leather bag and a lower leather bag nipple, wherein the upper end of the middle nipple is connected with the upper leather bag nipple, the lower end of the middle nipple is connected with the lower leather bag nipple, the upper end of the upper leather bag nipple is connected with an upper liquid discharge valve, the lower end of the lower leather bag nipple is connected with a lower pipe column liquid inlet channel, the bidirectional motor and the bidirectional gear pump are both fixed in the middle nipple, the upper leather bag is arranged in the upper leather bag nipple, the lower leather bag is arranged in the lower leather bag nipple, the power output end of the bidirectional motor is connected with a bidirectional gear pump power input end, the bidirectional gear pump is provided with two first outlets and two second outlets, the first outlets are connected with an upper leather bag inlet, and the second outlets are connected with a lower leather bag inlet.
An upper fixing seat is arranged on the inner wall of the lower port of the upper leather bag pup joint, an upper leather bag inlet mounting hole is formed in the center of the upper fixing seat, the upper leather bag inlet is an upper leather bag threaded section, and the upper leather bag threaded section is arranged in the upper leather bag inlet mounting hole; the inner wall of the upper port of the lower leather bag pup joint is provided with a lower fixing seat, the center of the lower fixing seat is provided with a lower leather bag inlet mounting hole, the lower leather bag inlet is a lower leather bag thread section, and the lower leather bag thread section is arranged in the lower leather bag inlet mounting hole.
The first outlet of the two-way gear pump is connected with the lower end of the first oil circuit pipeline, the upper end of the first oil circuit pipeline is connected with the upper leather bag connector, the upper leather bag connector is connected with the upper leather bag inlet, the second outlet of the two-way gear pump is connected with the upper end of the second oil circuit pipeline, the lower end of the second oil circuit pipeline is connected with the lower leather bag connector, and the lower leather bag connector is connected with the lower leather bag inlet.
The other parts of the first oil line except the two end parts of the first oil line penetrate out and are positioned outside the middle pup joint; the second oil line is provided with two end parts, and the other parts of the second oil line penetrate out and are positioned outside the middle pup joint.
The lower end of the upper pipe column liquid inlet channel is connected with an upper pipe column liquid inlet valve through a liquid inlet valve connector, and the upper end of the upper pipe column liquid inlet channel is connected with a radial liquid inlet hole formed in the upper half section of the upper leather bag nipple.
In order to achieve the above purpose, the application adopts the following technical scheme that the method for lifting the fluid in the well comprises the following steps:
during production, the bidirectional motor drives the bidirectional gear pump to rotate forward, lubricating oil or hydraulic oil is transferred from the lower leather bag to the upper leather bag, the volume of the lower leather bag is reduced, the pressure of a pup joint of the lower leather bag is reduced, a liquid inlet valve of a lower pipe column is opened, and liquid in a stratum enters the lower pipe column under the action of stratum pressure; the volume of the upper leather bag is increased, so that the liquid column in the column above the upper leather bag is pushed to ascend;
after the lubricating oil or hydraulic oil enters the upper leather bag, the bidirectional gear pump is reversed, the lubricating oil or hydraulic oil flows from the upper leather bag to the lower leather bag, the volume of the lower leather bag is increased at the moment, the pressure of the pup joint of the lower leather bag is increased, the fluid in the well in the lower production string enters a closed annular space formed by the upper pup joint, the lower string liquid inlet valve, the upper string liquid inlet valve and the outer pipe under the pressure action from the lower liquid discharge valve, and then enters the upper oil pipe from the string liquid inlet hole; meanwhile, as the volume of the upper leather bag is reduced, the pressure in the pup joint of the upper leather bag is reduced, the upper pipe column liquid inlet valve is opened, and well fluid enters the pup joint of the upper leather bag from the upper pipe column liquid inlet valve along the upper pipe column liquid inlet channel;
the bidirectional gear pump alternately rotates forwards and reversely, and fluid in the stratum continuously enters the production string from the upper string liquid inlet valve and the lower string liquid inlet valve; fluid in the formation is continuously accumulated in the upper string until it is lifted to the surface.
Compared with the prior art, the application has the following beneficial effects:
1. the oil pump cannot be blocked by sand, so that the safety accident that the oil pump is turned over due to blocking of the pump is avoided;
2. the fluid in the well does not contact any mechanical reciprocating or rotating structural member, so that the corrosion and abrasion phenomena of the mechanical structure caused by corrosion of the sand-containing fluid in the well are thoroughly avoided, and the maintenance-free period of the oil well is prolonged;
3. whether the gear pump rotates positively or reversely, the well fluid can enter the production pipe column, and the production efficiency is doubled;
4. the method is also suitable for gas-containing wells, and thoroughly avoids the problems of airlocks of pumps and the like.
5. And a sucker rod column is not needed, so that the problem of eccentric wear of the pipe rod is thoroughly avoided.
Drawings
FIG. 1 is a schematic diagram of a well fluid lifting device according to the present application.
The symbols in the drawings illustrate: the device comprises a 1-upper nipple, a 2-pipe column liquid inlet, a 3-upper liquid discharge valve, a 4-upper leather bag nipple, a 5-outer pipe, a 6-upper leather bag, a 7-upper leather bag threaded section, an 8-upper fixing seat, a 9-upper leather bag connector, a 10-middle nipple, a 11-first oil pipeline, a 14-second oil pipeline, a 12-two-way motor, a 13-two-way gear pump, a 15-lower leather bag, a 16-lower leather bag nipple, a 17-lower liquid discharge valve, a 18-upper pipe column liquid inlet channel, a 19-liquid inlet valve connector, a 20-upper pipe column liquid inlet valve, a 21-lower pipe column liquid inlet valve, a 22-lower leather bag threaded section, a 23-lower fixing seat, a 24-lower leather bag connector and a 25-lower pipe column liquid inlet channel.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Referring to fig. 1, the present application provides a technical solution: the utility model provides a well fluid lifting device, includes outer tube 5, two-way drive lifting mechanism, upper portion nipple joint 1, upper portion tubular column feed liquor valve 20, lower portion tubular column feed liquor valve 21, upper portion flowing back valve 3, lower portion flowing back valve 17, upper portion nipple joint is installed in the upper portion nipple joint mounting hole that the outer tube upper end was seted up, upper portion tubular column feed liquor valve is installed in the upper portion tubular column feed liquor valve mounting hole that the outer tube lower extreme was seted up, lower portion tubular column feed liquor valve is installed in the lower portion tubular column feed liquor valve mounting hole that the outer tube lower extreme was seted up, two-way drive lifting mechanism wholly is located the outer tube inside, upper portion tubular column feed liquor valve 20 export is through upper portion tubular column feed liquor passageway and two-way drive lifting mechanism upper end inner chamber intercommunication, lower portion tubular column feed liquor valve 21 export is through lower portion tubular column feed liquor passageway and two-way drive lifting mechanism lower end inner chamber intercommunication, lower portion tubular column feed liquor passageway is seted up bypass passageway, bypass tubular column feed liquor passageway is inside the outer tube lower portion flowing back valve 17, upper portion flowing back valve outlet portion flowing back valve and outer tube feed liquor valve 2 radial pipe joint portion inner chamber intercommunication.
The bidirectional driving lifting mechanism comprises a bidirectional motor 12, a bidirectional gear pump 13, a middle nipple 10, an upper leather bag 6, an upper leather bag nipple 4, a lower leather bag 15 and a lower leather bag nipple 16, wherein the upper end of the middle nipple is connected with the upper leather bag nipple, the lower end of the middle nipple is connected with the lower leather bag nipple, the upper end of the upper leather bag nipple is connected with an upper drain valve 3, the lower end of the lower leather bag nipple is connected with a lower pipe column liquid inlet channel, the bidirectional motor and the bidirectional gear pump are both fixed in the middle nipple 10, the upper leather bag is arranged in the upper leather bag nipple 4, the lower leather bag is arranged in the lower leather bag nipple 16, the power output end of the bidirectional motor is connected with the power input end of the bidirectional gear pump, the bidirectional gear pump is provided with two first outlets and second outlets, the first outlets are connected with the inlet of the upper leather bag, and the second outlets are connected with the inlet of the lower leather bag.
An upper fixing seat 8 is arranged on the inner wall of the lower port of the upper leather bag pup joint in a threaded manner, an upper leather bag inlet mounting threaded hole is formed in the center of the upper fixing seat, the upper leather bag inlet is an upper leather bag threaded section 7, and the upper leather bag threaded section 7 is arranged in the upper leather bag inlet mounting threaded hole in a threaded manner; the lower leather bag nipple is characterized in that a lower fixing seat 23 is installed on the inner wall of the upper port of the lower leather bag nipple in a threaded manner, a lower leather bag inlet installation threaded hole is formed in the center of the lower fixing seat, the lower leather bag inlet is a lower leather bag threaded section 22, and the lower leather bag threaded section is installed in the lower leather bag inlet installation threaded hole in a threaded manner.
The first outlet of the two-way gear pump is connected with the lower end of the first oil circuit pipeline 11, the upper end of the first oil circuit pipeline is connected with the upper leather bag connector, the upper leather bag connector 9 is connected with the upper leather bag inlet, the second outlet of the two-way gear pump is connected with the upper end of the second oil circuit pipeline 14, the lower end of the second oil circuit pipeline is connected with the lower leather bag connector, and the lower leather bag connector is connected with the lower leather bag inlet.
The other parts of the first oil line except the two end parts of the first oil line penetrate out and are positioned outside the middle pup joint 10; the second oil line is provided with two end parts, and the other parts of the second oil line penetrate out and are positioned outside the middle pup joint. The fact that the pipe nipple penetrates out of the middle pipe nipple is based on the fact that the space of the underground is narrow. In theory, the oil line does not influence the function realization in or out of the middle nipple, but the diameter of the middle nipple can be reduced by the installation mode that the line passes out of the middle nipple.
The lower end of the upper pipe column liquid inlet channel 11 is connected with an upper pipe column liquid inlet valve through a liquid inlet valve connector, and the upper end of the upper pipe column liquid inlet channel is connected with a radial liquid inlet hole formed in the upper half section of the upper leather bag nipple 4.
The outer pipe 5 is tightly connected with the upper nipple 1, the upper pipe column liquid inlet valve 20 and the lower pipe column liquid inlet valve 21 to form a closed annular space, and a flow channel is provided for the produced liquid entering from the lower pipe column liquid inlet valve 21. The manner of tight connection includes, but is not limited to, screw-fit seals, screw-fit filling aids, welding, and the like.
The upper pipe column liquid inlet valve 20 is in threaded connection with the liquid inlet valve joint 19, a produced liquid flow pipe 18 is connected above the liquid inlet valve joint 19, and the produced liquid flow pipe 18 is directly connected with the epithelial nipple 4.
The upper part of the upper nipple 1 is connected with a tubing coupling, and the lower parts of an upper pipe column liquid inlet valve 20 and a lower pipe column liquid inlet valve 21 are respectively connected with a sieve tube.
The opening of the upper leather bag 6 is provided with an upper leather bag thread section 7, and the opening of the lower leather bag 15 is provided with a lower leather bag thread section 22. The upper fixing seat 8 is respectively in threaded engagement with the upper bladder thread section 7 of the upper bladder 6 and the upper bladder nipple 4, so that the upper bladder 6 is fixed in the upper bladder nipple 4. The lower bladder 15 is secured within the lower bladder nipple 16 in the same manner. The thread length of the upper leather bag thread section 7 is longer than that of the upper fixing seat 8, so that the upper leather bag thread section 7 can be still in threaded fit with the upper leather bag joint 9 after being in threaded fit with the upper fixing seat 8. The lower leather bag nipple is characterized in that a lower fixing seat 23 is installed on the inner wall of the upper port of the lower leather bag nipple in a threaded manner, a lower leather bag inlet installation threaded hole is formed in the center of the lower fixing seat, the lower leather bag inlet is a lower leather bag threaded section 22, and the lower leather bag threaded section is installed in the lower leather bag inlet installation threaded hole in a threaded manner. The lower bladder thread segment has a longer thread length than the lower anchor mount thread length, so that the lower bladder thread segment can still be threaded into engagement with the lower bladder adapter 24 after threaded engagement with the lower anchor mount.
Lubricating grease (or hydraulic oil) flows between the upper bladder 6 and the lower bladder 15 via the oil line 11, the bidirectional gear pump 13, and the oil line 14.
The formation production fluid has two passages into the string. One is: when the lower leather bag 15 is contracted, the well fluid enters the production string through the lower string liquid inlet valve 21; when the lower leather bag 15 is enlarged, the water enters a closed annular space formed by tightly connecting an upper nipple 1, an upper pipe column liquid inlet valve 20 and a lower pipe column liquid inlet valve 21 through a lower liquid discharge valve 17, and then enters the pipe column through a pipe column liquid inlet hole 2. And the second is: when the upper leather bag 6 is contracted, well fluid enters an upper pipe column liquid inlet valve 20 and then enters an upper leather bag pup joint 4 along an upper pipe column liquid inlet channel 18; when the epithelial pocket is enlarged, the produced fluid is squeezed from the upper drainage valve 3 to the upper tubular string.
The components such as the air bag, various valves and the like in the application belong to the prior art in the technical field, and the components are directly connected by application.
During production, the bidirectional motor drives the bidirectional gear pump to rotate forward, lubricating oil (or hydraulic oil) is transferred from the lower leather bag to the upper leather bag, the volume of the lower leather bag is reduced, the pressure of the short section of the lower leather bag is reduced, the liquid inlet valve of the lower pipe column is opened, and liquid in stratum enters the lower pipe column under the action of stratum pressure. The volume of the epithelial cell is increased, and then the liquid column in the tubular column above the epithelial cell is pushed to ascend.
After the lubricating oil (or hydraulic oil) enters the upper leather bag, the bidirectional gear pump is reversed, the lubricating oil (or hydraulic oil) flows from the upper leather bag to the lower leather bag, the volume of the lower leather bag is increased, the pressure of the lower leather bag pup joint is increased, well fluid in the lower production string enters a closed annular space formed by the upper pup joint, the lower string liquid inlet valve, the upper string liquid inlet valve and the outer pipe from the lower liquid discharge valve under the action of pressure, and then enters the upper oil pipe from the string liquid inlet hole. Meanwhile, as the volume of the upper leather bag is reduced, the pressure in the pup joint of the upper leather bag is reduced, the upper pipe column liquid inlet valve is opened, and well fluid enters the pup joint of the upper leather bag from the upper pipe column liquid inlet valve along the upper pipe column liquid inlet channel.
The bidirectional gear pump alternately rotates forwards and reversely, and fluid in the stratum continuously enters the production string from the upper string liquid inlet valve and the lower string liquid inlet valve. Fluid in the formation is continuously accumulated in the upper string until it is lifted to the surface.
Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the application, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The underground fluid lifting device is characterized by comprising an outer tube, a bidirectional driving lifting mechanism, an upper nipple, an upper tubular column liquid inlet valve, a lower tubular column liquid inlet valve, an upper liquid outlet valve and a lower liquid outlet valve, wherein the upper nipple is installed in an upper nipple installation hole formed at the upper end of the outer tube, the upper tubular column liquid inlet valve is installed in an upper tubular column liquid inlet valve installation hole formed at the lower end of the outer tube, the lower tubular column liquid inlet valve is installed in a lower tubular column liquid inlet valve installation hole formed at the lower end of the outer tube, the bidirectional driving lifting mechanism is integrally positioned in the outer tube, the upper end of the bidirectional driving lifting mechanism is connected with a lower port of the upper nipple through the upper liquid outlet valve, an outlet of the upper tubular column liquid inlet valve is communicated with an inner cavity at the upper end of the bidirectional driving lifting mechanism through a lower tubular column liquid inlet channel, a liquid outlet of the lower tubular column liquid inlet valve is communicated with an inner cavity at the lower end of the bidirectional driving lifting mechanism, a liquid outlet of the lower tubular column liquid inlet valve is formed in a bypass channel, the lower tubular column liquid outlet valve is installed in the bypass channel, and the lower tubular column liquid outlet valve is communicated with an inner cavity at the upper end of the pipe through the upper nipple; the liquid inlet channel of the upper pipe column is an elongated pipe section;
the bidirectional driving lifting mechanism comprises a bidirectional motor, a bidirectional gear pump, a middle nipple, an upper leather bag nipple, a lower leather bag and a lower leather bag nipple, wherein the upper end of the middle nipple is connected with the upper leather bag nipple, the lower end of the middle nipple is connected with the lower leather bag nipple, the upper end of the upper leather bag nipple is connected with an upper drain valve, the lower end of the lower leather bag nipple is connected with a lower pipe column liquid inlet channel, the bidirectional motor and the bidirectional gear pump are both fixed in the middle nipple, the upper leather bag is arranged in the upper leather bag nipple, the lower leather bag is arranged in the lower leather bag nipple, the power output end of the bidirectional motor is connected with a bidirectional gear pump power input end, the bidirectional gear pump is provided with two first outlets and two second outlets, and the first outlets are connected with an upper leather bag inlet and the second outlets are connected with a lower leather bag inlet;
an upper fixing seat is arranged on the inner wall of the lower port of the upper leather bag pup joint, an upper leather bag inlet mounting hole is formed in the center of the upper fixing seat, the upper leather bag inlet is an upper leather bag threaded section, and the upper leather bag threaded section is arranged in the upper leather bag inlet mounting hole; the inner wall of the upper port of the lower leather bag pup joint is provided with a lower fixing seat, the center of the lower fixing seat is provided with a lower leather bag inlet mounting hole, the lower leather bag inlet is a lower leather bag threaded section, and the lower leather bag threaded section is arranged in the lower leather bag inlet mounting hole;
the first outlet of the two-way gear pump is connected with the lower end of the first oil circuit pipeline, the upper end of the first oil circuit pipeline is connected with the upper leather bag connector, the upper leather bag connector is connected with the upper leather bag inlet, the second outlet of the two-way gear pump is connected with the upper end of the second oil circuit pipeline, the lower end of the second oil circuit pipeline is connected with the lower leather bag connector, and the lower leather bag connector is connected with the lower leather bag inlet.
2. The apparatus of claim 1, wherein the first oil line extends out of the middle nipple except at both ends thereof; the second oil line is provided with two end parts, and the other parts of the second oil line penetrate out and are positioned outside the middle pup joint.
3. A downhole fluid lifting device according to claim 1 or 2, wherein the lower end of the upper pipe string liquid inlet passage is connected with an upper pipe string liquid inlet valve through a liquid inlet valve joint, and the upper end of the upper pipe string liquid inlet passage is connected with a radial liquid inlet hole formed in the upper half section of the upper bladder nipple.
4. A method of lifting a well fluid using the well fluid lifting device of claim 1, comprising the steps of:
during production, the bidirectional motor drives the bidirectional gear pump to rotate forward, lubricating oil or hydraulic oil is transferred from the lower leather bag to the upper leather bag, the volume of the lower leather bag is reduced, the pressure of a pup joint of the lower leather bag is reduced, a liquid inlet valve of a lower pipe column is opened, and liquid in a stratum enters the lower pipe column under the action of stratum pressure; the volume of the upper leather bag is increased, so that the liquid column in the column above the upper leather bag is pushed to ascend;
after the lubricating oil or hydraulic oil enters the upper leather bag, the bidirectional gear pump is reversed, the lubricating oil or hydraulic oil flows from the upper leather bag to the lower leather bag, the volume of the lower leather bag is increased at the moment, the pressure of the pup joint of the lower leather bag is increased, the fluid in the well in the lower production string enters a closed annular space formed by the upper pup joint, the lower string liquid inlet valve, the upper string liquid inlet valve and the outer pipe under the pressure action from the lower liquid discharge valve, and then enters the upper oil pipe from the string liquid inlet hole; meanwhile, as the volume of the upper leather bag is reduced, the pressure in the pup joint of the upper leather bag is reduced, the upper pipe column liquid inlet valve is opened, and well fluid enters the pup joint of the upper leather bag from the upper pipe column liquid inlet valve along the upper pipe column liquid inlet channel;
the bidirectional gear pump alternately rotates forwards and reversely, and fluid in the stratum continuously enters the production string from the upper string liquid inlet valve and the lower string liquid inlet valve; fluid in the formation is continuously accumulated in the upper string until it is lifted to the surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811507304.1A CN111287714B (en) | 2018-12-10 | 2018-12-10 | Lifting device and method for well fluid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811507304.1A CN111287714B (en) | 2018-12-10 | 2018-12-10 | Lifting device and method for well fluid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111287714A CN111287714A (en) | 2020-06-16 |
| CN111287714B true CN111287714B (en) | 2023-12-01 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811507304.1A Active CN111287714B (en) | 2018-12-10 | 2018-12-10 | Lifting device and method for well fluid |
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| CN (1) | CN111287714B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1844667A (en) * | 2006-04-26 | 2006-10-11 | 梁金国 | Down-hole linear motor and hydraulic cylinder driven capsule pump with balance weight for oil well |
| CN1844669A (en) * | 2006-04-26 | 2006-10-11 | 许一星 | Down-hole linear motor and hydraulic cylinder driven capsule pump |
| RU2012125016A (en) * | 2012-06-18 | 2013-12-27 | Ривенер Мусавирович Габдуллин | Borehole Pumping Unit |
| CN106089663A (en) * | 2016-08-15 | 2016-11-09 | 孙旭 | Continuous two-way lifting oil pump |
| CN209494553U (en) * | 2018-12-10 | 2019-10-15 | 中国石油化工股份有限公司 | A kind of borehole fluid lifting device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7736133B2 (en) * | 2006-05-23 | 2010-06-15 | Baker Hughes Incorporated | Capsule for two downhole pump modules |
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2018
- 2018-12-10 CN CN201811507304.1A patent/CN111287714B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1844667A (en) * | 2006-04-26 | 2006-10-11 | 梁金国 | Down-hole linear motor and hydraulic cylinder driven capsule pump with balance weight for oil well |
| CN1844669A (en) * | 2006-04-26 | 2006-10-11 | 许一星 | Down-hole linear motor and hydraulic cylinder driven capsule pump |
| RU2012125016A (en) * | 2012-06-18 | 2013-12-27 | Ривенер Мусавирович Габдуллин | Borehole Pumping Unit |
| CN106089663A (en) * | 2016-08-15 | 2016-11-09 | 孙旭 | Continuous two-way lifting oil pump |
| CN209494553U (en) * | 2018-12-10 | 2019-10-15 | 中国石油化工股份有限公司 | A kind of borehole fluid lifting device |
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| Publication number | Publication date |
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| CN111287714A (en) | 2020-06-16 |
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