CN116928092B - Oil discharge device for ground-driven screw pump oil extraction system - Google Patents
Oil discharge device for ground-driven screw pump oil extraction system Download PDFInfo
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- CN116928092B CN116928092B CN202210349650.1A CN202210349650A CN116928092B CN 116928092 B CN116928092 B CN 116928092B CN 202210349650 A CN202210349650 A CN 202210349650A CN 116928092 B CN116928092 B CN 116928092B
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- screw pump
- end head
- connecting rod
- sliding sleeve
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- 238000000605 extraction Methods 0.000 title abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 75
- 239000003129 oil well Substances 0.000 claims abstract description 9
- 238000006073 displacement reaction Methods 0.000 claims description 43
- 230000007246 mechanism Effects 0.000 claims description 11
- 238000011084 recovery Methods 0.000 claims description 8
- 238000011010 flushing procedure Methods 0.000 abstract description 5
- 239000004576 sand Substances 0.000 abstract description 2
- 239000012535 impurity Substances 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 9
- 238000007599 discharging Methods 0.000 description 7
- 239000012530 fluid Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
The invention discloses an oil discharge device for a ground-driven screw pump oil extraction system, which comprises a shell (5) connected with an oil pipe, wherein the shell (5) is provided with an oil discharge hole (7) communicated with a sleeve and is connected with an oil discharge switch, the oil discharge switch is connected with a starting structure, and the starting structure transmits the liquid column pressure of the oil pipe to the pressure discharge switch to open the pressure discharge hole (7) so as to enable the oil pipe to be communicated with the sleeve; the liquid column pressure disappears, and the pressure relief switch closes the pressure relief hole (7); the problem that the existing ground driving screw pump oil extraction system has large reverse torque, large restarting torque of a high sand-containing oil well and incapability of carrying out back flushing is solved.
Description
Technical Field
The invention relates to the field of oil extraction engineering, in particular to a ground-driven screw pump oil extraction system.
Background
The existing ground driving screw pump oil extraction system has the following problems that, on the first hand, after normal production is stopped, the phenomenon of 'hydraulic motor' can be generated because the produced liquid in the oil pipe is higher than the liquid in the oil sleeve annulus, the driving screw pump is reversely rotated when the liquid in the oil pipe falls back, so that the reverse torque of the screw pump is rapidly increased, if the reverse torque is not controlled, the ground driving device of the screw pump is in reverse danger, and crisis ground operators and equipment facilities are safe.
In the second aspect, if the produced liquid in the oil pipe contains more impurities, when the impurities fall back to the same liquid level of the oil sleeve annulus along with the produced liquid through the screw pump, the impurities are accumulated in the screw pump along with accumulation of time, so that torque of restarting after stopping the pump is increased, and even the situation that the screw pump is blocked is caused, so that normal production of the screw pump is affected.
In the third aspect, the wax deposition phenomenon occurs in the oil pipe above the screw pump, and the screw pump well needs to be washed (i.e. backwashed), but the screw pump stator and rotor cannot be provided with a well washing channel in an interference fit mode, so that the backwashed operation cannot be performed because the well washing channel is not provided when the backwashed operation is needed.
Disclosure of Invention
In view of the above, the invention provides an oil discharge device for a ground-driven screw pump oil extraction system, so as to solve the problems of large reverse torque, large restarting torque of a high sand-containing oil well and incapability of back flushing of the existing ground-driven screw pump oil extraction system.
To achieve the above object, the oil discharge device for a ground-driven screw pump oil recovery system includes:
a housing connected to the oil pipe;
the shell is provided with a drain hole communicated with the sleeve and is connected with a pressure relief switch;
the oil drain switch is connected with the starting structure;
The starting structure transmits the liquid column pressure in the oil pipe to the pressure relief switch to open the pressure relief hole, so that the oil pipe is communicated with the sleeve;
the liquid column pressure disappears, and the pressure relief switch closes the pressure relief hole.
Further, the drain switch includes:
Sliding sleeve and elastic piece;
the liquid column pressure drives the starting structure to compress the elastic piece so as to generate axial displacement;
The axial displacement is used for driving the sliding sleeve to open the pressure relief hole;
the pressure of the liquid column disappears, and the elastic force of the elastic piece drives the sliding sleeve to return to close the pressure relief hole;
And/or the number of the groups of groups,
The starting structure is connected with the driving mechanism;
The driving mechanism is respectively connected with the sucker rod and the screw pump to transmit the rotation torque of the sucker rod to the screw pump.
Further, the driving mechanism includes:
An upper connecting rod and a lower connecting rod;
The upper connecting rod is connected with the sucker rod, and the lower connecting rod is connected with the screw pump;
the upper connecting rod transmits the rotational torque to the lower connecting rod.
Further, the upper connecting rod is connected with the lower end head;
The lower end head is connected with the starting structure;
And/or the number of the groups of groups,
The lower connecting rod is connected with the upper end head.
Further, the lower end head is structured such that the upper end area thereof is smaller than the lower end area thereof;
the lower end edge of the lower end head forms the starting structure;
And/or the number of the groups of groups,
The outer surface of the lower end head is provided with an upper groove structure;
The upper groove structure is used as a flow channel of the produced liquid of the screw pump, so that the flow area of the produced liquid flowing through the lower end head is increased, and the flow resistance is reduced.
Further, the lower end is in a shape of a reverse-buckling bowl;
the bowl-shaped lower end head is provided with a continuous surface and a bowl edge structure;
the bowl rim structure forms the starting structure;
The continuous surface is used for forming a continuous upper groove structure so as to ensure the smoothness of the flow of the produced liquid;
And/or the number of the groups of groups,
The upper groove structure is in a spiral shape so as to reduce rising resistance of the flow of the produced liquid;
And/or the number of the groups of groups,
The upper end is connected with the lower end.
Further, the upper end surface is provided with a lower groove structure;
The lower groove structure is used as a flow channel of produced liquid during normal production of an oil well, so that the flow quantity of the produced liquid flowing through the upper end head in unit time is increased, and the flow resistance is reduced.
Further, an upper displacement baffle and a lower displacement baffle are arranged in the shell;
The upper displacement baffle and the lower displacement baffle are respectively used as an upper limit and a lower limit of the lower end head and the upper end head.
Further, the upper displacement baffle and the lower displacement baffle are respectively provided with a liquid flow hole;
The liquid flow hole is used for increasing the flow area of the produced liquid when the produced liquid flows through the upper displacement baffle plate and the lower displacement baffle plate, and reducing the flow resistance.
Further, a second sliding sleeve is connected in the shell;
the second sliding sleeve is driven by oil well produced liquid to lift the sliding sleeve so as to assist the elastic piece to support the sliding sleeve to close the pressure relief hole.
The invention has the following beneficial effects:
According to the oil unloading device, the pressure release hole is formed in the shell connected with the oil pipe, the oil pipe is communicated with the oil sleeve annulus through the pressure release hole, the pressure release switch and the starting structure are arranged for the pressure release hole, then the starting structure can be used for transmitting the liquid column pressure in the oil pipe (generated by the fact that the produced liquid in the oil pipe is higher than the liquid in the oil sleeve annulus) to the pressure release switch so as to open the pressure release hole, and therefore the liquid column pressure in the oil pipe (produced liquid in the oil pipe) is led into the oil sleeve annulus through the pressure release hole.
According to the first aspect, after the liquid column pressure in the oil pipe is led into the sleeve, the liquid column pressure gradually disappears, so that the situation that the liquid column pressure drives the screw pump to reverse rotation to cause the reverse rotation torque of the screw pump to be rapidly increased, the ground driving device of the screw pump is in reverse rotation danger, and crisis ground operators and equipment facilities are safe.
In the second aspect, because impurities such as gravel can be accumulated above the screw pump in the oil extraction process, when the screw pump stops running, the impurities such as gravel can be also introduced into the oil jacket annulus along with the produced liquid in the process of falling back the produced liquid in the oil pipe (the process of introducing the liquid column pressure into the oil jacket annulus), so that the phenomenon that torque is increased due to the existence of the impurities when the screw pump is restarted after the screw pump stops running is avoided, and the situation that the screw pump is blocked is avoided.
In the third aspect, when the screw pump well needs to be thermally washed due to the wax precipitation phenomenon, a certain pressure is applied to the sucker rod through the ground device to press the sliding sleeve to move downwards until the oil discharging hole is completely opened, so that liquid in the annular space of the oil sleeve enters the shell, and back flushing of an oil pipe at the upper part of the oil discharging device is realized.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of a quick oil unloading device of a ground-driven screw pump oil extraction system according to an embodiment of the invention.
Detailed Description
The present invention is described below based on examples, but it should be noted that the present invention is not limited to these examples. In the following detailed description of the present invention, certain specific details are set forth in detail. However, for the part not described in detail, the present invention is also fully understood by those skilled in the art.
Furthermore, those of ordinary skill in the art will appreciate that the drawings are provided solely for the purposes of illustrating the objects, features, and advantages of the invention and that the drawings are not necessarily drawn to scale.
Meanwhile, unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, it is the meaning of "including but not limited to".
Fig. 1 is a schematic structural diagram of a quick oil unloading device of a ground-driven screw pump oil extraction system according to an embodiment of the invention. In fig. 1, the oil discharge device for the ground-driven screw pump oil extraction system comprises a shell 5 connected with an oil pipe, wherein the shell 5 is provided with an oil discharge hole 7 communicated with a sleeve and is connected with a pressure release switch, so that the oil pipe can be communicated with the sleeve through the oil discharge hole 7; the oil drain switch is connected with the starting structure, and the pressure of the liquid column in the oil pipe can be transferred to the pressure relief switch through the starting structure to open the pressure relief hole 7, so that the oil pipe is communicated with the sleeve, and the pressure of the liquid column in the oil pipe (produced by the liquid in the oil pipe being higher than the liquid in the oil sleeve annulus) is led into the sleeve through the pressure relief hole 7. With the disappearance of liquid column pressure, the pressure release switch closes pressure release hole 7, and the oil jacket annular space is isolated with oil pipe, can continue the normal operating of screw pump oil recovery.
After the liquid column pressure in the oil pipe is led into the sleeve, the liquid column pressure gradually disappears, so that the situation that the liquid column pressure drives the screw pump to reverse rotation to cause the rapid increase of reverse rotation torque of the screw pump, the ground driving device of the screw pump is in reverse rotation danger, and crisis ground operators and equipment facilities are safe can be avoided.
In addition, because impurities such as gravel can be accumulated above the screw pump in the oil extraction process, when the screw pump stops running, the impurities such as gravel can be also guided into the oil sleeve annulus along with the produced liquid in the process of falling back the produced liquid in the oil pipe (the process of guiding the liquid column pressure into the oil sleeve annulus), so that the phenomenon that the torque is increased due to the existence of the impurities when the screw pump is restarted after the screw pump stops is avoided, and the situation that the screw pump is blocked is avoided.
And when the screw pump well is required to be thermally washed due to the wax precipitation phenomenon, a certain pressure is applied to the sucker rod through the ground device to press the sliding sleeve 8 to move downwards until the oil discharging hole 7 is completely opened, so that liquid in the annulus of the oil sleeve enters the shell 5, and back flushing of the oil pipe at the upper part of the oil discharging device is realized.
In fig. 1, the oil drain switch includes a sliding sleeve 8 and an elastic member 9; the liquid column pressure drives the starting structure to compress the elastic piece 9 to generate axial downward displacement, and the sliding sleeve 8 is driven to move downwards simultaneously by the axial downward movement of the elastic piece 9, so that the pressure relief hole 7 is opened; when the pressure of the liquid column gradually disappears, the elastic force of the elastic piece 9 drives the sliding sleeve 8 to return, and the sliding sleeve 8 closes the pressure release hole 7. Of course, the elastic member 9 may be a compression spring or other members having the same function, and the material of the elastic member 9 is not limited in this embodiment.
In fig. 1, the actuating structure is coupled to a drive mechanism that is coupled to the sucker rod and the screw pump, respectively, to transmit rotational torque of the sucker rod to the screw pump. Specifically, the driving mechanism comprises an upper connecting rod 2 and a lower connecting rod 12; the upper joint 1 of the upper connecting rod 2 is connected with a sucker rod, and the lower joint 13 of the lower connecting rod 12 is connected with a screw pump; the upper connecting rod 2 transmits the rotational torque of the sucker rod to the lower connecting rod 12.
In fig. 1, the upper connecting rod 2 is connected to the lower end 4, but the lower end 4 may be integrally formed with the upper connecting rod 2.
Preferably, the lower end 4 may have a structure in which an upper end area is smaller than a lower end area thereof, so that a lower end of the lower end 4 protrudes, and a lower end edge of the lower end 4 may form an actuating structure.
In fig. 1, the outer surface of the lower end 4 has an upper groove structure, and the upper groove structure can be used as a flow channel of the produced liquid of the screw pump, that is, the produced liquid can rise into the upper oil pipe through the upper groove structure, so that the flow area of the produced liquid flowing through the lower end 4 is increased, and the flow resistance flowing through the position is reduced.
Preferably, the lower end 4 is in the shape of a reverse-buckled bowl, the bowl-shaped lower end 4 can have a continuous surface and a bowl edge structure, and the bowl edge structure can form an actuating structure; the continuous surface can form a continuous upper groove structure so as to ensure the smoothness of the flow of the produced liquid in the upper groove structure.
More preferably, the upper groove structure is spiral in shape to reduce resistance of upward flow of produced fluid.
In fig. 1, the lower connecting rod 12 is connected to the upper head 6, and the upper head 6 is connected to the lower head 4 to transmit rotational torque.
In fig. 1, the surface of the upper end head 6 has a lower groove structure, and the lower groove structure is used as a flow channel of the produced liquid of the screw pump during normal production of an oil well, so that the flow rate of the produced liquid flowing through the upper end head 6 in unit time can be increased, and the flow resistance of the produced liquid flowing through the upper end head 6 can be reduced.
In fig. 1, an upper displacement baffle 3 and a lower displacement baffle 11 are disposed in the housing 5, the upper displacement baffle 3 and the lower displacement baffle 11 are respectively used as an upper limit and a lower limit of the lower end 4 and the upper end 6 to control an axial displacement limit of a driving mechanism formed by the upper connecting rod 2 and the lower connecting rod 12, the axial displacement limit of the driving mechanism corresponds to an axial displacement limit of the sliding sleeve 8, and the axial displacement limit of the sliding sleeve 8 determines the opening or closing of the pressure relief hole 7, so that the axial displacement limit of the sliding sleeve 8 is controlled through the upper displacement baffle 3 and the lower displacement baffle 11 to further control the opening or closing accuracy degree of the pressure relief hole 7.
In fig. 1, the upper displacement baffle 3 and the lower displacement baffle 11 are respectively provided with a fluid flow hole, and the fluid flow holes can increase the flow area when the produced fluid flows through the upper displacement baffle 3 and the lower displacement baffle 11 so as to reduce the flow resistance when the produced fluid flows through the upper displacement baffle 3 and the lower displacement baffle 11.
In fig. 1, the second sliding sleeve 10 is further connected in the housing 5, when the ground drives the screw pump to produce oil, the produced liquid of the screw pump goes upward to generate driving force for the second sliding sleeve 10, the second sliding sleeve 10 goes upward to the lower part of the sliding sleeve 8 under the action of the driving force to generate a certain lifting force for the sliding sleeve 8, and the lifting force can assist the elastic piece 9 to support the sliding sleeve 8, so that the sealing degree of the pressure release hole 7 by the sliding sleeve 8 is improved, and the sealing requirement of the ground driving screw pump in the oil production process is met.
Specifically, the composition and connection relation of the oil discharge device for the ground-driven screw pump oil extraction system of the present embodiment are further described with reference to the accompanying drawings:
as shown in fig. 1: the oil discharge device consists of an upper connecting rod 2, an upper displacement baffle 3, a shell 5, an oil discharge hole 7, a sliding sleeve 8, an elastic piece 9, a second sliding sleeve 10, a lower displacement baffle 11 and a lower connecting rod 12.
The upper connecting rod 2, the upper displacement baffle 3, the sliding sleeve 8, the elastic piece 9, the second sliding sleeve 10, the lower displacement baffle 11 and the lower connecting rod 12 are placed in the shell 5, the lower end 4 of the upper connecting rod 2 and the upper end 6 of the lower connecting rod 12 are connected through a built-in track mechanism, the sliding sleeve 8 is positioned on the inner side of the oil unloading hole 7 and the upper side of the elastic piece 9, the second sliding sleeve 10 is positioned on the inner side of the elastic piece 9, the elastic piece 9 and the second sliding sleeve 10 are positioned on the upper side of the lower displacement baffle 11, the upper displacement baffle 3 and the lower displacement baffle 11 are arranged on the inner wall side of the shell 5, the oil unloading hole 7 is a circular symmetrical through hole on the shell 5, the upper joint 1 of the upper connecting rod 2 is used for connecting a sucker rod, and the lower joint 13 of the lower connecting rod 12 is used for connecting an underground screw pump.
Specifically, the following description is given to a specific working procedure of the oil discharging device for the ground-driven screw pump oil production system in this embodiment:
a. The device is positioned above the underground oil extraction screw pump, the lower end of the shell 5 of the device is connected with the shell of the underground oil extraction screw pump by adopting threads, and the lower joint 13 is connected with the upper end of the rotor of the underground oil extraction screw pump by adopting threads; the upper end of the shell 5 is connected with an oil pipe, the upper joint 1 is connected with the lower end of the sucker rod, so that the sucker rod can rotationally drive the upper connecting rod 2 and the lower connecting rod 12, the rotor rotary motion of the underground screw pump can be realized, and the driving and oil extraction of the underground screw pump can be completed.
B. in a non-production state, the upper joint 1 is positioned at the upper part of the sliding sleeve 8 due to the working characteristic of the underground screw pump;
c. when the oil well is normally produced, the built-in spring in the elastic piece 9 enables the sliding sleeve 8 to be always positioned higher than the oil discharge hole 7, the oil discharge hole 7 is in a closed state, the tightness in the oil discharge device is ensured, and the oil well is normally produced;
d. When the produced liquid in the screw pump flows through the oil unloading device during normal production of the oil well, the second sliding sleeve 10 moves upwards to the lower side of the sliding sleeve 8 along with the flow of the produced liquid, and a lifting effect is generated on the sliding sleeve 8, so that a supplementary limiting effect on the elastic piece 9 is achieved;
e. when the underground screw pump stops running, the produced liquid in the oil pipe falls back to the outer surface of the lower end head 4 of the oil discharge device, the upper connecting rod 2 and the lower connecting rod 12 are pushed to move downwards, the lower end head 4 overcomes the supporting function of the spring in the elastic piece 9 under the action of liquid column pressure, the sliding sleeve 8 is driven to move downwards to the lower part of the oil discharge hole 7, the oil discharge hole 7 is opened, the purpose of liquid communication in the produced liquid and oil sleeve annulus in the oil discharge device is achieved, and the quick discharge of the produced liquid in the oil pipe is realized.
F. When the liquid pressure in the liquid produced in the oil discharging device and the liquid pressure in the oil sleeve ring control are equal, the spring in the elastic piece 9 rebounds to drive the sliding sleeve 8 to move upwards to close the oil discharging hole 7, and the oil production is waited to resume again.
G. When the oil pipe on the oil discharge device is subjected to wax precipitation, and the screw pump well is required to be washed by heat, a certain pressure is applied to the sucker rod through the ground device, and the lower end head 4 presses the sliding sleeve 8 to move downwards until the oil discharge hole 7 is completely opened, so that the purpose that liquid in the annulus of the oil sleeve enters the oil discharge device is achieved, and the back flushing of the oil pipe on the upper part of the oil discharge device is achieved.
The above examples are merely illustrative embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that modifications, equivalent substitutions, improvements, etc. can be made by those skilled in the art without departing from the spirit of the present invention, and these are all within the scope of the present invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (6)
1. An oil discharge apparatus for a ground-driven screw pump oil recovery system, comprising:
A housing (5) connected to the oil pipe;
the shell (5) is provided with a pressure relief hole (7) communicated with the sleeve and is connected with a pressure relief switch;
The pressure release switch is connected with the starting structure;
the starting structure transmits the liquid column pressure in the oil pipe to the pressure relief switch to open the pressure relief hole (7) so as to enable the oil pipe to be communicated with the sleeve;
the liquid column pressure disappears, and the pressure relief switch closes the pressure relief hole (7);
The pressure release switch includes:
a sliding sleeve (8) and an elastic piece (9);
-said liquid column pressure driving said actuation structure to compress said elastic member (9) to produce an axial displacement;
the axial displacement is used for driving the sliding sleeve (8) to open the pressure relief hole (7);
the liquid column pressure disappears, and the resilience force of the elastic piece (9) drives the sliding sleeve (8) to return so as to close the pressure relief hole (7);
The starting structure is connected with the driving mechanism;
The driving mechanism is respectively connected with the sucker rod and the screw pump to transmit the rotation torque of the sucker rod to the screw pump;
the driving mechanism includes:
an upper connecting rod (2) and a lower connecting rod (12);
The upper connecting rod (2) is connected with the sucker rod, and the lower connecting rod (12) is connected with the screw pump;
The upper connecting rod (2) transmits the rotation torque to the lower connecting rod (12);
the upper connecting rod (2) is connected with the lower end head (4);
the lower end head (4) is connected with the starting structure;
The lower connecting rod (12) is connected with the upper end head (6);
the structure of the lower end head (4) is that the upper end area is smaller than the lower end area;
The lower end edge of the lower end head (4) forms the starting structure;
the outer surface of the lower end head (4) is provided with an upper groove structure;
the lower end head (4) is in a shape of a reverse-buckling bowl;
the bowl-shaped lower end head (4) is provided with a continuous surface and a bowl edge structure;
the bowl rim structure forms the starting structure;
the continuous surface is used for forming a continuous upper groove structure so as to ensure the smoothness of the flow of the produced liquid;
The upper end head (6) is connected with the lower end head (4).
2. The oil discharge device for a ground-driven screw pump oil recovery system of claim 1, wherein:
the upper groove structure is in a spiral shape.
3. The oil discharge device for a ground-driven screw pump oil recovery system of claim 2, wherein:
the surface of the upper end head (6) is provided with a lower groove structure.
4. An oil discharge apparatus for a ground-driven screw pump oil recovery system according to any one of claims 1-3, wherein:
an upper displacement baffle (3) and a lower displacement baffle (11) are arranged in the shell (5);
The upper displacement baffle (3) and the lower displacement baffle (11) are respectively used as an upper limit and a lower limit of the lower end head (4) and the upper end head (6).
5. The oil discharge apparatus for a ground-driven screw pump oil recovery system of claim 4, wherein:
the upper displacement baffle (3) and the lower displacement baffle (11) are respectively provided with a liquid flow through hole.
6. An oil discharge apparatus for a ground-driven screw pump oil recovery system according to any one of claims 1-3 or 5, wherein:
the second sliding sleeve (10) is connected in the shell (5);
The second sliding sleeve (10) is driven by oil well produced liquid to lift the sliding sleeve (8) so as to assist the elastic piece (9) to support the sliding sleeve (8) to close the pressure relief hole (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210349650.1A CN116928092B (en) | 2022-04-02 | Oil discharge device for ground-driven screw pump oil extraction system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210349650.1A CN116928092B (en) | 2022-04-02 | Oil discharge device for ground-driven screw pump oil extraction system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116928092A CN116928092A (en) | 2023-10-24 |
| CN116928092B true CN116928092B (en) | 2024-11-19 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104329242A (en) * | 2014-09-05 | 2015-02-04 | 胜利油田北方实业集团有限责任公司 | Pipe type oil suction pump |
| CN106122004A (en) * | 2016-08-10 | 2016-11-16 | 姜经志 | Sand discharge pressure release single flow device |
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104329242A (en) * | 2014-09-05 | 2015-02-04 | 胜利油田北方实业集团有限责任公司 | Pipe type oil suction pump |
| CN106122004A (en) * | 2016-08-10 | 2016-11-16 | 姜经志 | Sand discharge pressure release single flow device |
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