CN111287714A - Device and method for lifting fluid in well - Google Patents
Device and method for lifting fluid in well Download PDFInfo
- Publication number
- CN111287714A CN111287714A CN201811507304.1A CN201811507304A CN111287714A CN 111287714 A CN111287714 A CN 111287714A CN 201811507304 A CN201811507304 A CN 201811507304A CN 111287714 A CN111287714 A CN 111287714A
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- Prior art keywords
- leather bag
- pipe column
- liquid inlet
- inlet valve
- fluid
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- 239000012530 fluid Substances 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 142
- 239000010985 leather Substances 0.000 claims abstract description 134
- 238000004519 manufacturing process Methods 0.000 claims abstract description 23
- 210000002445 nipple Anatomy 0.000 claims description 62
- 239000003921 oil Substances 0.000 claims description 45
- 230000002457 bidirectional effect Effects 0.000 claims description 39
- 230000007246 mechanism Effects 0.000 claims description 15
- 238000009434 installation Methods 0.000 claims description 14
- 230000015572 biosynthetic process Effects 0.000 claims description 11
- 239000010720 hydraulic oil Substances 0.000 claims description 11
- 239000010687 lubricating oil Substances 0.000 claims description 10
- 230000009471 action Effects 0.000 claims description 5
- 239000004576 sand Substances 0.000 abstract description 11
- 238000005260 corrosion Methods 0.000 abstract description 6
- 230000007797 corrosion Effects 0.000 abstract description 6
- 239000003129 oil well Substances 0.000 abstract description 6
- 241000463219 Epitheca Species 0.000 description 12
- 238000005299 abrasion Methods 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000011229 interlayer Substances 0.000 description 3
- 230000000903 blocking effect Effects 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
- 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
- 239000000945 filler Substances 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
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 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
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- 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 invention discloses a device and a method for lifting fluid in a well. One is as follows: when the lower leather bag shrinks, the fluid in the well enters the production pipe column through the lower pipe column liquid inlet valve; when the lower leather bag is enlarged, the lower liquid discharge valve enters a closed annular space formed by tightly connecting the upper short section, the upper pipe column liquid inlet valve and the lower pipe column liquid inlet valve, and then enters the pipe column through the pipe column liquid inlet hole. The second is that: when the upper leather bag shrinks, the fluid in the well enters the upper pipe column liquid inlet valve and then enters the upper leather bag short section along the upper pipe column liquid inlet channel; when the epithelial sac is enlarged, the produced fluid is squeezed from the upper drain valve to the upper tubing string. When the device is used, 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 oil well corrosion and sand production on liquid production equipment is thoroughly avoided.
Description
Technical Field
The invention relates to the technical field of oil extraction in the petroleum industry, in particular to a device and a method for lifting fluid in a well.
Background
The sand production of the oil well is one of the important problems which hinder the normal production of the oil well, and for a common plunger pump, production problems and safety accidents such as oil well pump sand jamming, plunger abrasion, pumping unit being pulled over due to the pump sand jamming and the like are easily caused; for a screw pump, a well is easy to lie due to sand blocking; for the electric submersible pump, the abrasion of machine unit components and even sand blocking can be caused, and the service life of the machine unit is influenced. In addition, most of the formation liquid is very corrosive, and key working components of various pumps are in direct contact with the formation liquid to cause corrosion, so that the working efficiency of the pumps is reduced. The current common method is to adopt various sand prevention and corrosion prevention methods such as pump body plating, sand prevention groove opening, corrosion inhibitor adding and the like to play a certain effect, but moving parts of the pump still generate abrasion and corrosion conditions due to direct contact with formation liquid.
Application No.: 201610671913.5 discloses a continuous bidirectional lifting oil pump, which is characterized in that the pump comprises an inner cavity and an outer cavity, so that the pump forms an inner space located in the inner cavity and an interlayer space located between the inner cavity and the outer cavity; the top of the inner cavity is provided with a top seal, a piston for dividing the inner space into an upper space and a lower space is arranged in the inner cavity, and the pumping rod penetrates through the top seal and is connected with the piston; the bottom of the inner cavity and the bottom of the outer cavity are provided with end covers, the end covers are provided with lower pump body oil inlet valves leading to the lower space, lower pump body oil outlet valves leading to the interlayer space are arranged below the side wall of the inner cavity, upper pump body oil outlet valves leading to the interlayer space are arranged above the side wall of the inner cavity, and upper pump body oil inlet valves leading to 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 one-way valves. The invention can realize oil pumping in both the up stroke and the down stroke, and improve the working efficiency.
Compared with the present application, the above-mentioned disclosed technologies are not the same in terms of overall technical solutions, purposes of the invention, effects of the invention, and the like, and do not have any technical teaching.
Disclosure of Invention
The invention aims to provide a device and a method for lifting fluid in a well, which utilize the positive rotation and the negative 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 that the upper leather bag and the lower leather bag are alternately expanded and reduced, and the pressure in a pipe column above the gear pump and the pressure in a pipe column below the gear pump are alternately increased and reduced; because the device is provided with two sets of valves, liquid in the formation can enter the production string no matter the size of the lower leather bag is increased or reduced. The gear pump rotates forwards and backwards continuously, the leather bags are alternately enlarged and reduced, and 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 oil well corrosion and sand production on liquid production equipment is thoroughly avoided.
In order to achieve the purpose, the invention adopts the following technical scheme that the device for lifting fluid in the well comprises an outer pipe, a bidirectional driving lifting mechanism, an upper pipe nipple, an upper pipe column liquid inlet valve, a lower pipe column liquid inlet valve, an upper liquid outlet valve and a lower liquid outlet valve, wherein the upper pipe nipple is arranged in an upper pipe nipple mounting hole formed in the upper end of the outer pipe, the upper pipe column liquid inlet valve is arranged in an upper pipe column liquid inlet valve mounting hole formed in the lower end of the outer pipe, the lower pipe column liquid inlet valve is arranged in a lower pipe column liquid inlet valve mounting hole formed in the lower end of the outer pipe, the bidirectional driving lifting mechanism is integrally positioned in the outer pipe, the upper end of the bidirectional driving lifting mechanism is connected with the lower port of the upper pipe nipple through the upper liquid outlet valve, the outlet of the upper pipe column liquid inlet valve is communicated with an inner cavity in the upper end of the bidirectional driving lifting mechanism through an upper pipe, the lower pipe column liquid inlet channel is provided with a bypass liquid outlet channel, a lower liquid outlet valve is installed in the bypass liquid outlet channel, the outlet of the lower liquid outlet valve is communicated with the inner cavity of the outer pipe, the upper short section is provided with a radial pipe column liquid inlet hole, and the upper short section is communicated with the inner cavity of the outer pipe through the pipe column liquid inlet hole.
Bidirectional drive lifting mechanism includes two-way motor, two-way gear pump, middle part nipple joint, epitheca nipple joint, lower leather pocket nipple joint, epitheca nipple joint upper end is connected the epitheca nipple joint, and middle part nipple joint lower extreme is connected the lower leather pocket nipple joint, and upper portion leakage fluid valve is connected to epitheca nipple joint upper end, and lower part tubular column inlet channel is connected to lower leather pocket nipple joint lower extreme, two-way motor, two-way gear pump are all fixed in the nipple joint of middle part, the epitheca sets up in the epitheca nipple joint, the leather pocket sets up in lower leather pocket nipple joint down, two-way motor power output connects two-way gear pump power input, and two-way gear pump has two first exports and second export, and the first export is connected the epitheca entry, and the leather pocket entry is.
An upper fixing seat is installed on the inner wall of the lower port of the upper leather bag nipple, an upper leather bag inlet installation 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 installed in the upper leather bag inlet installation hole; the lower leather bag short section is characterized in that a lower fixing seat is installed on the inner wall of an upper port of the lower leather bag short section, a lower leather bag inlet installation hole is formed in the center of the lower fixing seat, a lower leather bag inlet is a lower leather bag threaded section, and the lower leather bag threaded section is installed in the lower leather bag inlet installation hole.
A first outlet of the bidirectional gear pump is connected with the lower end of a first oil pipeline, the upper end of the first oil pipeline is connected with an upper leather bag joint, the upper leather bag joint is connected with an upper leather bag inlet, a second outlet of the bidirectional gear pump is connected with the upper end of a second oil pipeline, the lower end of the second oil pipeline is connected with a lower leather bag joint, and the lower leather bag joint is connected with a lower leather bag inlet.
The first oil line penetrates out of the middle short section except the two end parts of the first oil line; except two ends of the second oil pipeline, the rest parts of the second oil pipeline penetrate out of the middle short section.
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 joint, 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 connecting leather bag nipple.
In order to achieve the purpose, the invention 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 forwards, 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 nipple pressure of the lower leather bag is reduced, the liquid inlet valve of the lower pipe column is opened, and liquid in the stratum enters the lower pipe column under the action of the stratum pressure; the volume of the epithelial sac is increased, so that a liquid column in the pipe column above the epithelial sac is pushed to go upwards;
after lubricating oil or hydraulic oil enters the upper leather bag, the bidirectional gear pump rotates reversely, the lubricating oil or the 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 a nipple of the lower leather bag is increased, and well fluid in a lower production pipe column enters a closed annular space formed by the upper nipple, a lower pipe column liquid inlet valve, an upper pipe column liquid inlet valve and an outer pipe from a lower liquid outlet valve under the action of pressure and then enters an upper oil pipe from a pipe column liquid inlet hole; meanwhile, as the volume of the upper bladder is reduced, the pressure in the upper bladder nipple is reduced, the upper pipe column liquid inlet valve is opened, and well fluid enters the upper bladder nipple from the upper pipe column liquid inlet valve along the upper pipe column liquid inlet channel;
the bidirectional gear pump rotates forwards and reversely alternately, and fluid in the formation continuously enters the production string from the upper pipe column liquid inlet valve and the lower pipe column liquid inlet valve; fluid within the formation continues to accumulate in the upper string until it is lifted to the surface.
Compared with the prior art, the invention has the following beneficial effects:
1. the oil pump cannot be clamped by sand, so that the safety accident that the oil pumping unit is pulled and turned over due to the clamping of the pump is avoided;
2. the fluid in the well is not contacted with any mechanical reciprocating or rotating structural part, so that the phenomenon of mechanical structure corrosion and abrasion caused by the sand-containing fluid corroded in the well is thoroughly avoided, and the maintenance-free period of the oil well is prolonged;
3. no matter the gear pump rotates forwards or reversely, fluid in the well can enter the production pipe column, and the production efficiency is doubled;
4. the method is also suitable for gas wells containing gas, and the problems of gas lock and the like of the pump are thoroughly avoided.
5. The rod string is not needed, and the eccentric wear problem of the pipe rod is thoroughly avoided.
Drawings
Fig. 1 is a schematic diagram of a well fluid lifting apparatus according to the present invention.
The symbols in the drawings illustrate that: 1-upper pipe nipple, 2-pipe column liquid inlet hole, 3-upper liquid outlet valve, 4-upper pipe nipple, 5-outer pipe, 6-upper pipe bladder, 7-upper pipe bladder thread section, 8-upper fixing seat, 9-upper pipe bladder joint, 10-middle pipe nipple, 11-first oil line, 14-second oil line, 12-two-way motor, 13-two-way gear pump, 15-lower pipe bladder, 16-lower pipe bladder nipple, 17-lower liquid outlet valve, 18-upper pipe column liquid inlet channel, 19-liquid inlet valve joint, 20-upper pipe column liquid inlet valve, 21-lower pipe column liquid inlet valve, 22-lower pipe bladder thread section, 23-lower fixing seat, 24-lower pipe bladder joint and 25-lower pipe column liquid inlet channel.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: a fluid lifting device in a well comprises an outer pipe 5, a bidirectional driving lifting mechanism, an upper pipe nipple 1, an upper pipe column liquid inlet valve 20, a lower pipe column liquid inlet valve 21, an upper liquid discharge valve 3 and a lower liquid discharge valve 17, wherein the upper pipe nipple is installed in an upper pipe nipple installation hole formed in the upper end of the outer pipe, the upper pipe column liquid inlet valve is installed in an upper pipe column liquid inlet valve installation hole formed in the lower end of the outer pipe, the lower pipe column liquid inlet valve is installed in a lower pipe column liquid inlet valve installation hole formed in the lower end of the outer pipe, the bidirectional driving lifting mechanism is integrally positioned in the outer pipe, the upper end of the bidirectional driving lifting mechanism is connected with the lower end port of the upper pipe nipple through the upper liquid discharge valve 3, the outlet of the upper pipe column liquid inlet valve 20 is communicated with an inner cavity in the upper end of the bidirectional driving lifting mechanism through an upper pipe column liquid inlet, the lower pipe column liquid inlet channel is provided with a bypass liquid outlet channel, a lower liquid outlet valve 17 is installed in the bypass liquid outlet channel, the outlet of the lower liquid outlet valve is communicated with the inner cavity of the outer pipe, the upper short section is provided with a radial pipe column liquid inlet hole 2, and the upper short section is communicated with the inner cavity of the outer pipe through the pipe column liquid inlet hole.
Bidirectional drive lifting mechanism includes two-way motor 12, two-way gear pump 13, middle part nipple joint 10, goes up leather bag 6, goes up leather bag nipple joint 4, lower leather bag 15, lower leather bag nipple joint 16, leather bag nipple joint is connected to middle part nipple joint upper end, and leather bag nipple joint under the middle part nipple joint lower extreme is connected, goes up leather bag nipple joint upper end and connects upper portion flowing back valve 3, and lower leather bag nipple joint lower extreme connects lower part tubular column feed liquor passageway, two-way motor, two-way gear pump are all fixed in middle part nipple joint 10, it sets up in last leather bag nipple joint 4 to go up the leather bag, the leather bag sets up under in leather bag nipple joint 16, two-way motor power output end connects two-way gear pump power input end, and two-way gear pump has two first exports and second export, and the leather bag entry is gone up in the.
An upper fixing seat 8 is installed in a threaded manner on the inner wall of a lower port of the upper leather bag nipple, an upper leather bag inlet installation 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 installed in the upper leather bag inlet installation threaded hole in a threaded manner; the lower leather bag short section upper end opening inner wall thread buckle type mounting lower portion fixing seat 23 is provided with a lower leather bag inlet mounting threaded hole in the center, the lower leather bag inlet is a lower leather bag threaded section 22, and the lower leather bag threaded section thread buckle type mounting is arranged in the lower leather bag inlet mounting threaded hole.
A first outlet of the bidirectional gear pump is connected with the lower end of a first oil pipeline 11, the upper end of the first oil pipeline is connected with an upper leather bag joint, an upper leather bag joint 9 is connected with an upper leather bag inlet, a second outlet of the bidirectional gear pump is connected with the upper end of a second oil pipeline 14, the lower end of the second oil pipeline is connected with a lower leather bag joint, and the lower leather bag joint is connected with a lower leather bag inlet.
The first oil line penetrates out of the middle short section 10 except the two end parts of the first oil line; except two ends of the second oil pipeline, the rest parts of the second oil pipeline penetrate out of the middle short section. The middle nipple is penetrated out based on the consideration of narrow space in the well. Theoretically speaking, the oil pipeline does not influence the function realization in the middle short section or outside, but the pipeline penetrates out of the middle short section in the mounting mode, so that the diameter of the middle short section can be reduced.
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 joint, 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 connecting leather bag nipple 4.
The outer pipe 5 is tightly connected with the upper pipe 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 produced liquid entering from the lower pipe column liquid inlet valve 21. The manner of tight connection includes, but is not limited to, thread fit seal, thread fit filler, welding, etc.
An upper pipe column liquid inlet valve 20 is in threaded connection with a 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 upper bladder nipple 4.
The upper part of the upper short section 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 pipe.
An opening of the upper leather bag 6 is provided with an upper leather bag threaded section 7, and an opening of the lower leather bag 15 is provided with a lower leather bag threaded section 22. The upper fixing seat 8 is in threaded fit with the upper leather bag threaded section 7 of the upper leather bag 6 and the upper leather bag short section 4 respectively, so that the upper leather bag 6 is fixed in the upper leather bag short section 4. The lower bladder 15 is secured within the lower bladder nipple 16 in the same manner. The length of the thread of the epithelial bag thread section 7 is longer than that of the thread of the upper fixing seat 8, so that the epithelial bag thread section 7 can still be in thread fit with the upper epithelial bag joint 9 after being in thread fit with the upper fixing seat 8. The lower leather bag short section upper end opening inner wall thread buckle type mounting lower portion fixing seat 23 is provided with a lower leather bag inlet mounting threaded hole in the center, the lower leather bag inlet is a lower leather bag threaded section 22, and the lower leather bag threaded section thread buckle type mounting is arranged in the lower leather bag inlet mounting threaded hole. The thread length of the lower leather bag thread section is longer than that of the lower fixing seat, so that the lower leather bag thread section can still be in thread fit with the lower leather bag joint 24 after being in thread fit with the lower fixing seat.
Lubricating grease (or hydraulic oil) flows between the upper bladder 6 and the lower bladder 15 via an oil line 11, a bidirectional gear pump 13, and an oil line 14.
The formation production fluid has two passages into the string. One is as follows: when the lower leather bag 15 shrinks, the fluid in the well enters the production pipe column through the lower pipe column liquid inlet valve 21; when the lower leather bag 15 is enlarged, the lower liquid discharge valve 17 enters a closed annular space formed by tightly connecting the upper short section 1, the upper pipe column liquid inlet valve 20 and the lower pipe column liquid inlet valve 21, and then enters the pipe column through the pipe column liquid inlet hole 2. The second is that: when the epithelial bag 6 shrinks, the fluid in the well enters the upper pipe column liquid inlet valve 20 and then enters the epithelial bag short section 4 along the upper pipe column liquid inlet channel 18; when the epithelial pocket is enlarged, the produced liquid is pushed to the upper tubular column from the upper liquid discharge valve 3.
The parts such as the air bag, various valves and the like in the invention belong to the prior art in the technical field, and can be directly connected.
During production, the bidirectional motor drives the bidirectional gear pump to rotate positively, 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 nipple pressure of the lower leather bag is reduced, the liquid inlet valve of the lower pipe column is opened, and liquid in the stratum enters the lower pipe column under the action of the stratum pressure. The volume of the epithelial sac is increased, and then the liquid column in the pipe column above the epithelial sac is pushed to go upwards.
After lubricating oil (or hydraulic oil) got into the epitheca, two-way gear pump reversal, lubricating oil (or hydraulic oil) flowed to the epitheca from the epitheca, and the volume of the epitheca was increased this moment, and the nipple joint pressure of the epitheca increases, and fluid in the well in the lower part production tubular column gets into the airtight annular space that upper portion nipple joint, lower part tubular column feed liquor valve, upper portion tubular column feed liquor valve and outer tube formed from the lower part flowing back valve under the pressure effect, and then gets into upper portion oil pipe from tubular column feed liquor hole. Meanwhile, as the volume of the upper tubular bag is reduced, the pressure in the upper tubular bag short section is reduced, the upper tubular column liquid inlet valve is opened, and the well fluid enters the upper tubular bag short section from the upper tubular column liquid inlet valve along the upper tubular column liquid inlet channel.
The bidirectional gear pump rotates forward and backward alternately, and fluid in the formation continuously enters the production string from the upper pipe column liquid inlet valve and the lower pipe column liquid inlet valve. Fluid within the formation continues to accumulate in the upper string until it is lifted to the surface.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A fluid lifting device in a well is characterized by comprising an outer pipe, a bidirectional driving lifting mechanism, an upper pipe nipple, an upper pipe column liquid inlet valve, a lower pipe column liquid inlet valve, an upper liquid discharge valve and a lower liquid discharge valve, wherein the upper pipe nipple is installed in an upper pipe nipple installation hole formed in the upper end of the outer pipe, the upper pipe column liquid inlet valve is installed in an upper pipe column liquid inlet valve installation hole formed in the lower end of the outer pipe, the lower pipe column liquid inlet valve is installed in a lower pipe column liquid inlet valve installation hole formed in the lower end of the outer pipe, the bidirectional driving lifting mechanism is integrally positioned in the outer pipe, the upper end of the bidirectional driving lifting mechanism is connected with a lower port of the upper pipe nipple through the upper liquid discharge valve, an outlet of the upper pipe column liquid inlet valve is communicated with an inner cavity in the upper end of the bidirectional driving lifting mechanism through an upper pipe column liquid inlet channel, the lower pipe column liquid inlet channel is provided with a bypass liquid outlet channel, a lower liquid outlet valve is installed in the bypass liquid outlet channel, the outlet of the lower liquid outlet valve is communicated with the inner cavity of the outer pipe, the upper short section is provided with a radial pipe column liquid inlet hole, and the upper short section is communicated with the inner cavity of the outer pipe through the pipe column liquid inlet hole.
2. The device of claim 1, wherein the bi-directional driving lifting mechanism comprises a bi-directional motor, a bi-directional gear pump, a middle sub, an upper bladder sub, a lower bladder, and a lower bladder sub, the upper end of the middle short section is connected with an upper leather bag short section, the lower end of the middle short section is connected with a lower leather bag short section, the upper end of the upper leather bag short section is connected with an upper liquid discharge valve, the lower end of the lower leather bag short section is connected with a lower tubular column liquid inlet channel, the bidirectional motor and the bidirectional gear pump are both fixed in the middle short section, the epithelial bag is arranged in the epithelial bag short section, the lower leather bag is arranged in the lower leather bag short section, 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 a second outlet, the first outlets are connected with the upper leather bag inlet, and the second outlets are connected with the lower leather bag inlet.
3. The device for lifting the fluid in the well as claimed in claim 2, wherein an upper fixing seat is mounted on the inner wall of the lower port of the upper leather bag nipple, 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 mounted in the upper leather bag inlet mounting hole; the lower leather bag short section is characterized in that a lower fixing seat is installed on the inner wall of an upper port of the lower leather bag short section, a lower leather bag inlet installation hole is formed in the center of the lower fixing seat, a lower leather bag inlet is a lower leather bag threaded section, and the lower leather bag threaded section is installed in the lower leather bag inlet installation hole.
4. The downhole fluid lifting device according to claim 3, wherein the first outlet of the bidirectional gear pump is connected to the lower end of a first oil line, the upper end of the first oil line is connected to the upper bladder joint, the upper bladder joint is connected to the upper bladder inlet, the second outlet of the bidirectional gear pump is connected to the upper end of a second oil line, the lower end of the second oil line is connected to the lower bladder joint, and the lower bladder joint is connected to the lower bladder inlet.
5. The device for lifting fluid in a well according to claim 4, wherein the first oil line, except for two ends of the first oil line, penetrates out of the middle short section; except two ends of the second oil pipeline, the rest parts of the second oil pipeline penetrate out of the middle short section.
6. The downhole fluid lifting device of any one of claims 2 to 5, wherein the lower end of the upper tubular column fluid inlet channel is connected with an upper tubular column fluid inlet valve through a fluid inlet valve joint, and the upper end of the upper tubular column fluid inlet channel is connected with a radial fluid inlet hole formed in the upper half section of the upper leather bag short section.
7. A method of lifting a well fluid, comprising the steps of:
during production, the bidirectional motor drives the bidirectional gear pump to rotate forwards, 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 nipple pressure of the lower leather bag is reduced, the liquid inlet valve of the lower pipe column is opened, and liquid in the stratum enters the lower pipe column under the action of the stratum pressure; the volume of the epithelial sac is increased, so that a liquid column in the pipe column above the epithelial sac is pushed to go upwards;
after lubricating oil or hydraulic oil enters the upper leather bag, the bidirectional gear pump rotates reversely, the lubricating oil or the 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 a nipple of the lower leather bag is increased, and well fluid in a lower production pipe column enters a closed annular space formed by the upper nipple, a lower pipe column liquid inlet valve, an upper pipe column liquid inlet valve and an outer pipe from a lower liquid outlet valve under the action of pressure and then enters an upper oil pipe from a pipe column liquid inlet hole; meanwhile, as the volume of the upper bladder is reduced, the pressure in the upper bladder nipple is reduced, the upper pipe column liquid inlet valve is opened, and well fluid enters the upper bladder nipple from the upper pipe column liquid inlet valve along the upper pipe column liquid inlet channel;
the bidirectional gear pump rotates forwards and reversely alternately, and fluid in the formation continuously enters the production string from the upper pipe column liquid inlet valve and the lower pipe column liquid inlet valve; fluid within the formation continues to accumulate 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 |
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| Publication Number | Publication Date |
|---|---|
| CN111287714A true CN111287714A (en) | 2020-06-16 |
| CN111287714B CN111287714B (en) | 2023-12-01 |
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| CN201811507304.1A Active CN111287714B (en) | 2018-12-10 | 2018-12-10 | Lifting device and method for well fluid |
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Citations (6)
| 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 |
| US20070274849A1 (en) * | 2006-05-23 | 2007-11-29 | Baker Hughes Incorporate. | Capsule for Two Downhole Pump Modules |
| 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 |
-
2018
- 2018-12-10 CN CN201811507304.1A patent/CN111287714B/en active Active
Patent Citations (6)
| 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 |
| US20070274849A1 (en) * | 2006-05-23 | 2007-11-29 | Baker Hughes Incorporate. | Capsule for Two Downhole Pump Modules |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111287714B (en) | 2023-12-01 |
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