CN211855665U - Liquid isolation device for pressure transmitter - Google Patents
Liquid isolation device for pressure transmitter Download PDFInfo
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- CN211855665U CN211855665U CN202020261610.8U CN202020261610U CN211855665U CN 211855665 U CN211855665 U CN 211855665U CN 202020261610 U CN202020261610 U CN 202020261610U CN 211855665 U CN211855665 U CN 211855665U
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Abstract
The utility model provides a liquid isolation equipment for pressure transmitter belongs to oil field oil recovery technical field. The two ends of the piston pipe are respectively communicated with a pressure transmitter joint sleeve and an oil pipe joint sleeve, and the pressure transmitter joint sleeve and the oil pipe joint sleeve are respectively communicated with a pressure transmitter and a crude oil pipeline. The piston tube is internally provided with a slidable piston, and pressure measuring oil is injected into a pressure measuring oil containing space formed between the piston and one end of the piston tube close to the pressure transmitter joint sleeve. The pressure transmitter detects the oil pressure of the pressure measuring oil at one end of the piston pipe close to the pressure transmitter joint sleeve to obtain the oil pressure of the crude oil in the crude oil pipeline. The original pressure leading pipe of the pressure transmitter is replaced by the liquid isolation equipment, the two ends of the liquid isolation equipment are isolated by the piston, impurities in the liquid isolation equipment and crude oil pipelines can not enter the pressure transmitter, and the possibility of failure caused by the influence of the impurities on the pressure transmitter is reduced.
Description
Technical Field
The present disclosure relates to the field of oil extraction technology in oil fields, and more particularly, to a liquid isolation device for a pressure transmitter.
Background
The pressure transmitter amplifies weak electric signals collected by the pressure sensor so as to transmit or start a control element. Pressure transmitter is often used for oil well head pressure data acquisition, and pressure transmitter when using, pressure transmitter's the pressure pipe that draws need communicate with crude oil pipeline to make fluid can get into from crude oil pipeline and draw the pressure pipe and then measured by pressure transmitter.
Because pressure transmitter is in comparatively abominable environment, pressure transmitter gets into impurity and difficult clear away totally in the pressure pipe of leading of pressure transmitter when connecting the crude oil pipeline easily, appears impurity easily and gets into pressure transmitter and lead to pressure transmitter to break down the problem.
SUMMERY OF THE UTILITY MODEL
The disclosed embodiments provide a liquid isolation device for a pressure transmitter, which can reduce the possibility of the pressure transmitter failing. The technical scheme is as follows:
the embodiment of the disclosure provides a liquid isolation device for a pressure transmitter, which comprises a pressure transmitter joint sleeve, an oil pipe joint sleeve, a piston pipe and a piston, wherein one end of the pressure transmitter joint sleeve is coaxially and hermetically connected with one end of the piston pipe, the other end of the piston pipe is coaxially and hermetically connected with the oil pipe joint sleeve, the piston is slidably arranged in the piston pipe, and the piston is hermetically matched with the inner wall of the piston pipe,
and a pressure measuring oil liquid containing space is formed between the piston and one end of the piston pipe close to the pressure transmitter joint sleeve.
Optionally, the minimum inner diameter of the pressure transmitter coupling sleeve is the same as the minimum inner diameter of the tubing coupling sleeve.
Optionally, the minimum inner diameter of the pressure transmitter coupling sleeve is smaller than the inner diameter of the piston tube.
Optionally, both end faces of the piston are concave semi-spherical faces.
Optionally, a sealing ring is coaxially arranged on the outer wall of the piston.
Optionally, the diameter of the piston is smaller than the inner diameter of the piston tube.
Optionally, the liquid isolation device further comprises a pressure gauge valve, and an inlet end of the pressure gauge valve is connected with the pressure transmitter joint sleeve.
Optionally, the pressure transmitter adapter sleeve includes a first piston tube connecting cylinder and a first buffer ring cylinder which are coaxially connected, one end of the first piston tube connecting cylinder, which is far away from the first buffer ring cylinder, is in threaded connection with the piston tube, a first connecting channel is arranged at the joint of the first piston tube connecting cylinder and the first buffer ring cylinder, and the inner diameter of the first connecting channel is smaller than that of the piston tube.
Optionally, the oil pipe joint sleeve includes a second piston pipe connecting cylinder and a second buffer ring cylinder which are coaxially connected, one end of the second piston pipe connecting cylinder, which is far away from the second buffer ring cylinder, is coaxially connected with the piston pipe 3, a second connecting channel is arranged at the joint of the second piston pipe connecting cylinder and the second buffer ring cylinder, the inner diameter of the second piston pipe connecting cylinder is the same as the inner diameter of the first piston pipe connecting cylinder, the inner diameter of the second buffer ring cylinder is the same as the inner diameter of the first buffer ring cylinder, and the inner diameter of the second connecting channel is the same as the inner diameter of the first connecting channel.
Optionally, the pressure measuring oil containing space is provided with antifreeze pressure transmitter oil.
The beneficial effects brought by the technical scheme provided by the embodiment of the disclosure at least comprise:
the liquid isolation device for the pressure transmitter is arranged between the pressure transmitter and the crude oil pipeline, one end of a pressure transmitter joint sleeve in the liquid isolation device for the pressure transmitter is coaxially and hermetically connected with one end of a piston pipe, the other end of the piston pipe is coaxially and hermetically connected with an oil pipe joint sleeve, a piston is slidably arranged in the piston pipe, and the piston is hermetically matched with the inner wall of the piston pipe. The pressure measuring oil liquid formed between the piston and one end, close to the pressure transmitter joint sleeve, of the piston pipe is filled with pressure measuring oil liquid, the end, far away from the piston pipe, of the pressure transmitter joint sleeve of the liquid isolation device for the pressure transmitter is communicated with the pressure transmitter, a pressure transmitter detecting head extends into the pressure measuring oil liquid, and the end, far away from the piston pipe, of the oil pipe joint sleeve is coaxially communicated to a pipeline for conveying crude oil. The oil pressure in the crude oil pipeline can push the piston to move in the piston pipe, and the piston moves to transmit the oil pressure of crude oil in the crude oil pipeline to pressure measuring oil at one end of the piston pipe close to the pressure transmitter joint sleeve. The oil pressure change of the crude oil is converted into the oil pressure change of the pressure measuring oil through the piston, and the pressure transmitter detects the oil pressure of the pressure measuring oil at one end of the piston pipe close to the joint sleeve of the pressure transmitter to obtain the oil pressure of the crude oil in the crude oil pipeline. The original pressure leading pipe of the pressure transmitter is replaced by the liquid isolation equipment, the two ends of the liquid isolation equipment are isolated by the piston, impurities in the liquid isolation equipment and crude oil pipelines can not enter the pressure transmitter, and the possibility of failure caused by the influence of the impurities on the pressure transmitter is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings used in the description of the embodiments will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive efforts,
FIG. 1 is a schematic diagram of a fluid isolation device for a pressure transmitter provided by an embodiment of the present disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a fluid isolation device for a pressure transmitter according to an embodiment of the present disclosure, and as can be seen from fig. 1, the fluid isolation device for a pressure transmitter includes a pressure transmitter joint sleeve 1, an oil pipe joint sleeve 2, a piston pipe 3, and a piston 4. One end of a pressure transmitter joint sleeve 1 is coaxially and hermetically connected with one end of a piston pipe 3, the other end of the piston pipe 3 is coaxially and hermetically connected with an oil pipe joint sleeve 2, a piston 4 is slidably arranged in the piston pipe 3, and the piston 4 is hermetically matched with the inner wall of the piston pipe 3. And a pressure measuring oil liquid containing space S is formed between the piston 4 and one end of the piston pipe 3 close to the pressure transmitter joint sleeve 1.
Set up the liquid isolation device that is used for pressure transmitter between pressure transmitter and crude oil pipeline, the coaxial sealing connection of one end and the one end of piston pipe 3 of pressure transmitter adapter sleeve 1 among the liquid isolation device that is used for pressure transmitter, the other end and the coaxial sealing connection of oil pipe adapter sleeve 2 of piston pipe 3, piston 4 slidable ground sets up in piston pipe 3, and piston 4 and the sealed cooperation of the inner wall of piston pipe 3. The pressure measuring oil liquid formed between the piston 4 and one end of the piston pipe 3 close to the pressure transmitter joint sleeve 1 is filled in the pressure measuring oil liquid containing space S, one end of the pressure transmitter joint sleeve 1 of the liquid isolation device for the pressure transmitter, which is far away from the piston pipe 3, is communicated with the pressure transmitter, a probe of the pressure transmitter is extended into the pressure measuring oil liquid, and one end of the oil pipe joint sleeve 2, which is far away from the piston pipe 3, is coaxially communicated to a pipeline for conveying crude oil. The oil pressure in the crude oil pipeline can push the piston 4 to move in the piston pipe 3, and the piston 4 moves to transmit the oil pressure of the crude oil in the crude oil pipeline to the pressure measuring oil at one end of the piston pipe 3 close to the pressure transmitter joint sleeve 1. The oil pressure change of the crude oil is converted into the oil pressure change of the pressure measuring oil through the piston 4, and the pressure transmitter detects the oil pressure of the pressure measuring oil at one end of the piston pipe 3 close to the pressure transmitter joint sleeve 1 to obtain the oil pressure of the crude oil in the crude oil pipeline. The original pressure leading pipe of pressure transmitter has been replaced to liquid isolation equipment, and piston 4 has kept apart liquid isolation equipment both ends, and impurity when liquid isolation equipment and crude oil pipeline are connected can not get into pressure transmitter, and pressure transmitter receives the influence of impurity and the possibility that breaks down reduces.
It should be noted that the pressure measurement oil provided in the embodiment of the present disclosure is oil that does not contain impurities, and damage to the pressure transmitter is avoided.
Alternatively, the piston 4 may be cylindrical and the piston 4 is coaxially arranged within the piston tube 3.
The piston 4 is cylindrical and the piston 4 is coaxially arranged within the piston tube 3, facilitating axial movement of the piston 4 within the tubular piston tube 3.
It should be noted that in other implementations provided by the present disclosure, the shape of the piston 4 may also be an elliptic cylinder shape or a circular truncated cone shape or other shapes, which is not limited by the present disclosure.
As shown in fig. 1, both end surfaces 4a of the piston 4 may be concave hemispherical surfaces.
Two terminal surfaces 4a of piston 4 all can be sunken hemispherical surface, can increase the pressurized area of piston 4 and fluid, the removal of piston 4 in piston tube 3 of being convenient for to when the oil pressure of crude oil changes, the pressure of pressure measurement fluid also changes immediately thereupon, and pressure transmitter measures the real-time oil pressure data of crude oil in the crude oil pipeline.
In other implementations provided by the present disclosure, the two end surfaces of the piston 4 may also be provided in other shapes with grooves, which is not limited by the present disclosure.
As shown in fig. 1, the outer wall of the piston 4 may be coaxially provided with a sealing ring 5. The sealing ring 5 may improve the sealing between the piston 4 and the piston tube 3.
Alternatively, the piston 4 may be provided with at least two sealing rings 5 spaced apart in the axial direction of the piston 4. The sealing effect between the piston 4 and the piston tube 3 is better.
In one implementation provided by the present disclosure, the number of the sealing rings 5 may be 2, and in other implementations provided by the present disclosure, the number of the sealing rings 5 may also be 3, or 5, or 6, or other numbers, which is not limited by the present disclosure.
Alternatively, at least two sealing rings 5 on the piston 4 may be arranged equidistantly in the axial direction of the piston 4. The sealing effect is better.
For example, when the outer wall of the ring of the piston 4 has been provided with a sealing ring 5 to achieve sealing between the piston 4 and the piston tube 3, the diameter of the piston 4 may be smaller than the inner diameter of the piston tube 3.
The diameter of the piston 4 is smaller than the inner diameter of the piston tube 3, so that the sealing between the piston 4 and the piston tube 3 is ensured, the friction between the piston 4 and the piston tube 3 can be reduced, and the movement of the piston 4 in the piston tube 3 is convenient to realize.
Alternatively, in embodiments of the present disclosure, the piston 4 may be a nylon piston or a teflon piston. The piston tube 3 is easy to prepare, is not easy to adhere to the piston tube, and is convenient for the piston 4 to move.
Alternatively, the minimum inner diameter of the pressure transmitter coupling sleeve 1 may be the same as the minimum inner diameter of the tubing coupling sleeve 2.
The speed of oil flowing into the piston pipe 3 from a crude oil pipeline through the oil pipe joint sleeve 2 is limited by the minimum inner diameter of the oil pipe joint sleeve 2, the speed of oil flowing into the pressure transmitter from the piston pipe 3 through the pressure transmitter joint sleeve 1 is limited by the minimum inner diameter of the pressure transmitter joint sleeve 1, the minimum inner diameter of the pressure transmitter joint sleeve 1 is the same as the minimum inner diameter of the oil pipe joint sleeve 2, the speed of oil pressure change of the two sides of the piston 4 in the piston pipe 3 during movement can be approximately the same, and the real-time performance of oil pressure data measured by the pressure transmitter is guaranteed.
Alternatively, the minimum inner diameter of the pressure transmitter coupling sleeve 1 may be smaller than the inner diameter of the piston tube 3.
The minimum internal diameter of pressure transmitter adapter sleeve 1 is less than the internal diameter of piston pipe 3, and pressure transmitter adapter sleeve 1 can regard as the transition piece, reduces the impact of the fluid that flows into pressure transmitter from piston pipe 3 that pressure transmitter can receive.
Referring to fig. 1, the pressure transmitter coupling sleeve 1 may include a first piston pipe connecting cylinder 11 and a first buffer ring cylinder 12 coaxially connected, an end of the first piston pipe connecting cylinder 11 away from the first buffer ring cylinder 12 is screwed with the piston pipe 3, a first connecting passage 1a is formed at a joint of the first piston pipe connecting cylinder 11 and the first buffer ring cylinder 12, and an inner diameter of the first connecting passage 1a is smaller than an inner diameter of the piston pipe 3.
One end, far away from the first buffer annular cylinder 12, of the first piston pipe connecting cylinder 11 in the pressure transmitter joint sleeve 1 is in threaded connection with the piston pipe 3, so that the connection between the pressure transmitter joint sleeve 1 and a pressure transmitter is convenient to realize. The junction of first piston pipe connecting cylinder 11 and first buffering annular section of thick bamboo 12 has first connecting channel 1a, and the internal diameter of first connecting channel 1a is less than the internal diameter of piston pipe 3, then can reduce the impact of the fluid of flowing into pressure transmitter from piston pipe 3, guarantees pressure transmitter's stable use.
When the inner diameter of the pressure transmitter joint sleeve 1 changes, the minimum inner diameter of the pressure transmitter joint sleeve 1 is set as the minimum inner diameter of the pressure transmitter joint sleeve 1. For example, when the structure of the pressure transmitter coupling sleeve 1 in the previous stage is adopted, the minimum inner diameter of the pressure transmitter coupling sleeve 1 is the inner diameter of the first connecting passage 1 a. The minimum inner diameter of the oil pipe joint sleeve 2 is not described in detail herein.
Alternatively, the first piston tube connector barrel 11 may be sleeved on the piston tube 3. The connection is convenient.
Illustratively, the depth to which the piston tube 3 is inserted into the pressure transmitter coupling sleeve 1 may be less than the length of the pressure transmitter coupling sleeve 1.
The depth of the piston pipe 3 inserted into the pressure transmitter joint sleeve 1 is smaller than the length of the pressure transmitter joint sleeve 1, and a space for communicating with the pressure transmitter is reserved at one end, away from the piston pipe 3, of the pressure transmitter joint sleeve 1, so that the pressure transmitter joint sleeve 1 and the pressure transmitter can be conveniently communicated.
As shown in fig. 1, the inner diameter of the first buffer ring cylinder 12 may be larger than that of the first connection passage 1 a.
The inner diameter of the first buffer ring cylinder 12 may be larger than that of the first connection passage 1a, so that the pressure measuring oil can stably circulate in the pressure transmitter portion.
Optionally, the oil pipe joint sleeve 2 includes a second piston pipe connecting cylinder 21 and a second buffer ring cylinder 22 which are coaxially connected, one end of the second piston pipe connecting cylinder 21 far away from the second buffer ring cylinder 22 is coaxially connected with the piston pipe 3, a second connecting passage 2a is provided at a joint of the second piston pipe connecting cylinder 21 and the second buffer ring cylinder 22, an inner diameter of the second piston pipe connecting cylinder 21 is the same as an inner diameter of the first piston pipe connecting cylinder 11, an inner diameter of the second buffer ring cylinder 22 is the same as an inner diameter of the first buffer ring cylinder 12, and an inner diameter of the second connecting passage 2a is the same as an inner diameter of the first connecting passage 1 a.
In the oil pipe joint sleeve 2, the inner diameter of the second piston pipe connecting cylinder 21 is the same as that of the first piston pipe connecting cylinder 11, the inner diameter of the second buffer annular cylinder 22 is the same as that of the first buffer annular cylinder 12, and the inner diameter of the second connecting channel 2a is the same as that of the first connecting channel 1a, so that the flowing state of oil flowing into the piston pipe 3 from a crude oil pipeline is basically consistent with that of the oil flowing into the pressure transmitter from the piston pipe 3, the difference of the flowing states of the oil at two ends of the piston 4 in the piston pipe 3 is reduced, the oil pressure change states at two ends of the piston 4 tend to be consistent, and the real-time performance of oil pressure data measured by the pressure transmitter is ensured.
Illustratively, the oil pipe joint sleeve 2 and the crude oil pipeline can be fixed by welding. The sealing effect between the oil pipe joint sleeve 2 and the crude oil pipeline is ensured.
In an implementation mode provided by the present disclosure, the second buffer annular cylinder 22 of the oil pipe joint sleeve 2 can be welded with the crude oil pipeline after penetrating into the crude oil pipeline for 20mm, and the connection strength is good.
In other implementations provided by the present disclosure, the tubing joint sleeve 2 and the crude oil pipeline may also be in threaded connection, which is not limited by the present disclosure.
Illustratively, the pressure transmitter joint sleeve 1, the piston tube 3 and the oil tube joint sleeve 2 can be an A3 round steel pressure transmitter joint sleeve, an A3 round steel piston tube and an A3 round steel oil tube joint sleeve 2, respectively. The whole body is easy to manufacture.
As shown in fig. 1, a weight-reducing groove 31 may be coaxially disposed on an outer wall of the piston tube 3, and the weight-reducing groove 31 is located between the pressure transmitter joint sleeve 1 and the oil tube joint sleeve 2.
Referring to fig. 1, the weight-reducing groove 31 is formed on the outer wall of the piston tube 3, so that the weight of the piston tube 3 can be reduced, and the pressure transmitter and the liquid isolator can be stably mounted on different devices together.
Alternatively, the lightening groove 31 may be an annular groove coaxial with the piston tube 3. The piston tube 3 itself is easy to manufacture and has better strength.
In other implementations provided by the present disclosure, the weight-reduction grooves 31 may also be a plurality of groove structures that are equidistantly distributed on the outer circumferential wall of the piston tube 3, which is not limited by the present disclosure.
Alternatively, the pressure measuring oil containing space S may have antifreeze pressure transmitter oil (not shown in the drawings).
The oil liquid that pressure measurement fluid held space S holds is pressure transmitter oil of preventing frostbite, can reduce the stifled possibility of freezing of the fluid that piston 4 is close to pressure transmitter one end, guarantees that pressure transmitter also can normal use under low temperature environment.
Referring to fig. 1, the fluid isolation device may further include a pressure gauge valve 100, and an inlet end of the pressure gauge valve 100 is connected to the pressure transmitter coupling sleeve 1.
The pressure gauge valve 100 can cut off the oil flow between the pressure transmitter and the pressure transmitter joint sleeve 1 in time under the condition that the oil pressure change is large and the impact is large, thereby ensuring the stable use of the pressure transmitter.
Illustratively, the pressure gauge valve 100 may be a needle valve. The oil flowing into the pressure transmitter can be subjected to flow regulation.
The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.
Claims (10)
1. The liquid isolation device for the pressure transmitter is characterized by comprising a pressure transmitter joint sleeve (1), an oil pipe joint sleeve (2), a piston pipe (3) and a piston (4), wherein one end of the pressure transmitter joint sleeve (1) is coaxially and hermetically connected with one end of the piston pipe (3), the other end of the piston pipe (3) is coaxially and hermetically connected with the oil pipe joint sleeve (2), the piston (4) is slidably arranged in the piston pipe (3), and the piston (4) is hermetically matched with the inner wall of the piston pipe (3),
and a pressure measuring oil liquid containing space (S) is formed between the piston (4) and one end of the piston pipe (3) close to the pressure transmitter joint sleeve (1).
2. Liquid isolation device according to claim 1, characterized in that the smallest inner diameter of the pressure transmitter nipple (1) is the same as the smallest inner diameter of the tubing nipple (2).
3. Liquid isolation device according to claim 2, wherein the smallest inner diameter of the pressure transmitter nipple (1) is smaller than the inner diameter of the piston tube (3).
4. Liquid isolating device according to claim 1, characterised in that both end faces (4a) of the piston (4) are concave semi-spherical faces.
5. A liquid isolation apparatus according to any of claims 1 to 4, wherein a sealing ring (5) is coaxially arranged on the outer wall of the piston (4).
6. Liquid isolating device according to claim 5, characterized in that the diameter of the piston (4) is smaller than the inner diameter of the piston tube (3).
7. The fluid isolation device according to any one of claims 1 to 4, further comprising a pressure gauge valve (100), wherein an inlet end of the pressure gauge valve (100) is connected to the pressure transmitter joint sleeve (1).
8. The liquid isolation device according to any one of claims 1 to 4, wherein the pressure transmitter joint sleeve (1) comprises a first piston pipe connecting cylinder (11) and a first buffer annular cylinder (12) which are coaxially connected, one end of the first piston pipe connecting cylinder (11) far away from the first buffer annular cylinder (12) is in threaded connection with the piston pipe (3), a first connecting channel (1a) is arranged at the joint of the first piston pipe connecting cylinder (11) and the first buffer annular cylinder (12), and the inner diameter of the first connecting channel (1a) is smaller than that of the piston pipe (3).
9. Liquid isolation device according to claim 8, wherein the oil pipe joint housing (2) comprises a second piston pipe connection barrel (21) and a second buffer ring barrel (22) which are coaxially connected, wherein one end of the second piston pipe connection barrel (21) remote from the second buffer ring barrel (22) is coaxially connected with the piston pipe (3), wherein the joint of the second piston pipe connection barrel (21) and the second buffer ring barrel (22) is provided with a second connection channel (2a), wherein the inner diameter of the second piston pipe connection barrel (21) is the same as the inner diameter of the first piston pipe connection barrel (11), the inner diameter of the second buffer ring barrel (22) is the same as the inner diameter of the first buffer ring barrel (12), and the inner diameter of the second connection channel (2a) is the same as the inner diameter of the first connection channel (1 a).
10. The liquid isolation apparatus according to any one of claims 1 to 4, wherein the pressure measuring oil containing space (S) has an antifreezing pressure transmitter oil therein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020261610.8U CN211855665U (en) | 2020-03-05 | 2020-03-05 | Liquid isolation device for pressure transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020261610.8U CN211855665U (en) | 2020-03-05 | 2020-03-05 | Liquid isolation device for pressure transmitter |
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| Publication Number | Publication Date |
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| CN211855665U true CN211855665U (en) | 2020-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020261610.8U Active CN211855665U (en) | 2020-03-05 | 2020-03-05 | Liquid isolation device for pressure transmitter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113202447A (en) * | 2021-06-21 | 2021-08-03 | 穆洪升 | Water-mixing flow combined wellhead device |
-
2020
- 2020-03-05 CN CN202020261610.8U patent/CN211855665U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113202447A (en) * | 2021-06-21 | 2021-08-03 | 穆洪升 | Water-mixing flow combined wellhead device |
| CN113202447B (en) * | 2021-06-21 | 2021-12-28 | 大庆亿源石油科技开发有限公司 | Water-mixing flow combined wellhead device |
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