CN216714321U - Sealing thread structure for oil pipe and casing pipe combination - Google Patents
Sealing thread structure for oil pipe and casing pipe combination Download PDFInfo
- Publication number
- CN216714321U CN216714321U CN202123100148.7U CN202123100148U CN216714321U CN 216714321 U CN216714321 U CN 216714321U CN 202123100148 U CN202123100148 U CN 202123100148U CN 216714321 U CN216714321 U CN 216714321U
- Authority
- CN
- China
- Prior art keywords
- thread
- coupling
- pipe body
- shoulder
- casing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
The utility model provides a sealing thread structure combining an oil pipe and a sleeve, which comprises a pipe body, an assembling short section, a coupling, anti-loose locking thread grease, anti-loose oil sleeve thread grease and a sealing ring, wherein the pipe body is provided with a plurality of sealing holes; the end part of the tube body is provided with external threads and a nose shoulder, and the end surface of the nose shoulder is processed with a sealing groove. The coupling is of a left-right axial symmetrical structure, and two ends of the coupling are provided with internal threads matched with the external threads of the pipe body; the assembly short section is an external thread joint with a positioning shoulder; during assembly, the assembly nipple is connected firstly, so that the end face of the coupling is contacted with the positioning shoulder of the assembly nipple; screwing the external thread of the pipe body into the other side of the coupling, so that the end face of the pipe body is contacted with the end face of the assembly nipple and generates contact pressure; and then, the assembly short joint is disassembled, and a sealing ring is arranged on the end face of the pipe body. According to the utility model, the upper buckling position and the upper buckling torque of the factory end are accurately controlled by assembling the short section, so that stable contact pressure is effectively formed between the pipe body nose shoulders on two sides in the coupling when the oil and casing are used on site, and the connection and sealing functions of the whole pipe string are effectively ensured.
Description
[ technical field ] A method for producing a semiconductor device
The utility model relates to the technical field of oil casings for exploration and development of energy sources such as petroleum, natural gas, coal bed gas and the like, in particular to a sealing thread structure combining an oil pipe and a casing.
[ background of the utility model ]
In the exploration and development process of energy sources such as petroleum, natural gas, coal bed gas and the like, oil and casing strings are needed to stabilize a well wall to form an oil-gas channel. In recent decades, the threaded connection mode of oil pipes and casings of various oil fields in China is that single oil and casing are used to form an oil casing string. And the special petroleum thread for API is adopted for connection, and the API thread has the advantages of easy processing, convenient field matching short section, low processing cost, repeated screwing adaptation and the like. However, with the increase of the drilling depth of the oil well, the production of corrosive and high-pressure oil and gas wells and the injection of high-temperature and high-pressure steam into the heavy oil well, the application environment of the API thread is more severe and the application condition is more severe. The application environment when the oil well injects steam is as follows: pressure 15MPa, temperature 340 ℃. At the moment, the traditional API thread can resist the temperature of 150 ℃ and is broken through. The API thread is sealed under the cooperation of high-quality sealing grease, the sealing grease is firstly destroyed at the high temperature of 340 ℃, and then the working condition of the connection thread sealing is destroyed. In addition, the connection strength of the API thread is only 80% of the tensile strength of the pipe body, and one of the methods for improving the overall strength of the oil well downhole pipe column is to increase the thickness of the pipe body. The thicker the tubular body, the heavier the tubular string will increase the cost of steel used, and the greater the oil well tubular string load, which will create dual disadvantages for the user. Although various non-API special petroleum casing connecting threads exist in China at present, the common characteristics of the non-API special petroleum casing connecting threads are as follows: the metal-to-metal seal adopts conical surface seal and end surface seal. Because the relative displacement change range is large when the original API thread pin and box is screwed, the original API thread structure is usually sacrificed for ensuring the contact displacement of the pin and box, and non-API threads are adopted, so that a certain displacement value is reached. The non-API thread processing difficulty is large, the cost is high, and large-area popularization and use are not facilitated. According to field data statistics, when the API thread is used for oil pumping of an oil well, the thread is leaked due to the problems that the counter torque of a factory end is loosened, the shoulder surface is not jacked in place or the torque of the on-site end is insufficient, the daily liquid production of each pumping well is reduced by 5-10%, and obviously, the economic loss caused by thread leakage every day is huge for more than one hundred thousand pumping wells in China.
Accordingly, there is a need for a sealing thread configuration for a tubing and casing combination that overcomes one or more of the problems set forth above.
[ Utility model ] content
In view of the above, the utility model provides a sealing thread structure for an oil pipe and casing combination, which can overcome the problems that the factory-end counter-torque loose buckling, the shoulder surface not in place jacking or the field-end buckling torque is insufficient when the threaded connection is assembled in the prior art.
In one aspect, the present invention provides a sealing thread structure for a combination of an oil pipe and a casing, the sealing thread structure comprising:
the pipe comprises a pipe body, a coupling, an assembling short joint and a sealing ring;
an external thread is processed at the end part of the pipe body, a nose shoulder is processed at the front end of the external thread, and a sealing groove is processed on the end surface of the nose shoulder;
the coupling is of a left-right axial symmetric structure, internal threads matched with the external threads of the pipe body are respectively processed at two ends of the coupling, and a hollow cylindrical section is processed in the middle of the coupling;
the assembly pup joint is an external thread joint with a positioning shoulder, and external threads are matched with internal threads of the coupling; and the end thread of the pipe body is in assembly connection with the coupling.
The above aspects and any possible implementations further provide an implementation in which the sealing thread structure of the tubing and casing combination further comprises an anti-loosening locking thread grease and an anti-galling tubing and casing thread grease that are both disposed between the body end threads and the coupling.
The above aspects and any possible implementation further provide an implementation in which the threads at both ends of the pipe body are API threads or non-API special threads.
The above aspect and any possible implementation manner further provide an implementation manner that the cross-sectional thickness of the nose shoulder on the end face of the tube body is greater than or equal to 2.5mm, and the axial length is less than or equal to 4 mm.
In accordance with the above aspect and any possible implementation manner, there is further provided an implementation manner in which a seal groove is provided at the center of the wall thickness of the nose shoulder end surface of the pipe body, the width of the seal groove is less than or equal to 1/2 of the section thickness, and the axial depth is 3/4 of the width of the seal groove.
The above aspects and any possible implementations further provide an implementation in which the coupling internal threads mate with the pipe body end face external threads.
The above aspect and any possible implementation manner further provide an implementation manner, wherein the inner diameter of the hollow cylindrical section in the coupling is 0.2-0.6 mm larger than the outer diameter of the external thread nose shoulder, and the axial length is less than 2 times of the axial length of the external thread nose shoulder, which is 0.2-0.3 mm.
The above aspects and any possible implementation manner further provide an implementation manner that the assembled short section is processed with an external thread structure which is completely the same as the end face of the pipe body.
The above aspects and any possible implementation manner further provide an implementation manner, wherein the assembly nipple is machined with a positioning shoulder, and the outer diameter of the positioning shoulder is greater than or equal to the outer diameter of the coupling.
In accordance with the above-described aspects and any possible implementations, there is further provided an implementation in which the axial length of the fitting sub from the pipe end to the locating shoulder is 1/2 of the axial length of the collar.
In accordance with the above aspect and any one of the possible implementations, there is further provided an implementation in which the sealing ring is O-shaped, made of butadiene acrylonitrile rubber, and has a diameter equal to a width of the sealing groove.
Compared with the prior art, the utility model can obtain the following technical effects:
1): the coupling structure is completely axisymmetric, and a nose shoulder is processed on the external thread of the pipe body;
2): the assembly nipple is made of the same material as the pipe body and has a thread structure completely same as the external thread of the pipe body, and a positioning shoulder is machined on the assembly nipple;
3): when the factory end assembly of the threaded connection of the oil and the casing is carried out, the assembly positions of the assembly nipple and a coupling are controlled through the positioning shoulder on the assembly nipple, then anti-thread-sticking oil casing thread grease and locking oil casing thread grease are adopted in different thread sections of the oil and the casing end, and the upper buckling criterion that the upper buckling torque value is in contact combination with the shoulder is adopted, so that the threaded connection position and torque of the factory end oil casing are accurately controlled, and the accurate assembly and fastening matching of the factory end of the threaded connection of the oil and the casing are realized;
4): according to the O-shaped rubber sealing structure arranged on the end face of the nose shoulder of the external thread at the factory end, the sealing performance of the end face of the external thread of the pipe body at two sides of the coupling is more reliable;
5) the utility model can effectively ensure that stable contact pressure is formed between the nose shoulders of the external threads of the pipe bodies on the two sides of the coupling when the oil and the casing are used on site, and ensure the connection and sealing functions of the whole pipe string.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic view of a sealed thread configuration of a tubing and casing combination as assembled according to one embodiment of the present invention.
Wherein, in the figure:
wherein: 1-a pipe body; 2, assembling a short section; 3-coupling; 4-anti-loose fastening oil casing thread grease; 5-thread grease of anti-thread sticking oil casing; 6-O type sealing ring; 1-1-external threads of the pipe; 1-2-external thread nose shoulder; 1-3-sealing groove; 2-1-assembling a short section external thread; 2-2-assembling a short section positioning shoulder; 3-1-collar internal threads; 3-2-coupling inner hollow cylinder section.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the utility model, and not all 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.
The terminology used in the embodiments of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
In one aspect, the present invention provides a sealing thread structure for a combination of an oil pipe and a casing, the sealing thread structure comprising: the anti-loosening oil sleeve comprises a pipe body, a coupling, anti-loosening locking thread grease, anti-loosening oil sleeve thread grease, an assembling short section and an O-shaped sealing ring, wherein external threads are machined at the end part of the pipe body, a nose shoulder is machined at the front end of each external thread, and a sealing groove is formed in the center of the wall thickness of the end face of the nose shoulder; the coupling is of a left-right axial symmetry structure, internal threads matched with the external threads of the pipe body are respectively machined at two ends of the coupling, a hollow cylindrical section is machined in the middle of the coupling, the assembly nipple is an external thread connector with a positioning shoulder, and when the pipe body end is in threaded connection and the coupling is assembled, anti-loosening locking thread grease and anti-loosening oil casing thread grease are required to be used simultaneously. The O-shaped sealing ring is arranged in the sealing groove on the end face of the nose shoulder. The screw thread at both ends of the pipe body is API screw thread or non-API special screw thread. The cross-sectional thickness of body terminal surface nose shoulder more than or equal to 2.5mm, axial length less than or equal to 4mm, the width less than or equal to cross-sectional thickness's of nose shoulder terminal surface wall thickness center seal groove 1/2, axial depth are 3/4 of seal groove width, coupling internal thread and body terminal surface external screw thread phase-match. The inner diameter of the hollow cylindrical section in the coupling is 0.2-0.6 mm larger than the outer diameter of the external thread nose shoulder, and the axial length of the hollow cylindrical section is less than 2 times of the axial length of the external thread nose shoulder, and the axial length of the external thread nose shoulder is 0.2-0.3 mm. The assembled short section is processed with an external thread structure which is completely the same as the end face of the pipe body. And a positioning shoulder is machined on the assembling short section, and the outer diameter of the positioning shoulder is greater than or equal to that of the coupling. 1/2, wherein the axial length of the assembly nipple from the pipe end to the positioning shoulder is equal to the axial length of the coupling; the O-shaped sealing ring is made of butadiene-acrylonitrile rubber, and the diameter of the O-shaped sealing ring is equal to the width of the sealing groove.
When the utility model is assembled at a factory end, the concrete steps are as follows:
firstly, before a pipe body is in threaded connection with a coupling, the coupling is in threaded connection with an assembly nipple, so that a positioning shoulder of the assembly nipple is in contact with the end face of the coupling;
step two, uniformly smearing anti-thread-sticking oil casing thread grease on the length of the nose shoulder side 1/2 of the external thread section of the pipe body, uniformly smearing and locking oil casing thread grease on the length of the side 1/2 of the thread section pipe body, and screwing the external thread of the pipe body into the coupling;
step three, when the screwing torque value reaches a preset value and a nose shoulder touch signal appears on a torque curve, screwing operation of the external thread of the pipe body and the coupling is completed;
and step four, disassembling the assembling short section, placing a sealing ring in the sealing groove of the end face of the nose shoulder of the pipe body, and finishing the threaded connection and assembly of the factory end.
And in the step one, the clearance between the end face of the coupling and the positioning shoulder of the assembly nipple is less than or equal to 0.01mm, and the assembly nipple can be reused for many times.
As shown in figure 1, the utility model discloses a sealing thread structure of an oil pipe and casing combination, which comprises a pipe body 1, an assembling pup joint 2, a coupling 3, anti-loosening locking thread grease 4, anti-loosening oil casing thread grease 5 and an O-shaped sealing ring 6; the end part of the pipe body is processed with an external thread 1-1, the front end of the external thread is processed with a nose shoulder 1-2, and the center of the wall thickness of the end surface of the nose shoulder is provided with a sealing groove 1-3; the coupling 3 is of a left-right axial symmetrical structure, internal threads 3-1 matched with the external threads of the pipe body are respectively processed at two ends of the coupling, and a hollow cylindrical section 3-2 is processed in the middle of the coupling; the assembly short section 2 is an external thread joint with a positioning shoulder 2-2; when the threaded connection 1-1 at the end of the pipe body is assembled with the coupling 3, the anti-loosening locking thread grease 4 and the anti-loosening oil casing thread grease 5 are required to be used simultaneously. The O-shaped sealing ring 6 is made of butadiene-acrylonitrile rubber and has the diameter of 1.2 mm.
In one embodiment, the threads 1-1 on both ends of the tube body may be API threads or non-API special threads.
In one embodiment, the cross-sectional thickness of the nose shoulder 1-2 on the end face of the tube body is greater than or equal to 2.5mm, and the axial length is less than or equal to 4 mm.
In one embodiment, the tube body end face nose shoulder end face wall thickness center seal groove has a width of 1.2mm and an axial depth of 0.9 mm.
In one embodiment, the internal coupling threads 3-1 mate with the external pipe body end face threads 1-1.
In one embodiment, the inner diameter of the hollow cylindrical section 3-2 in the coupling is 0.2-0.6 mm larger than the outer diameter of the external thread nose shoulder 1-2, and the axial length is less than 2 times of the axial length of the external thread nose shoulder 1-2, and is 0.2-0.3 mm.
In one embodiment, the material of the assembly nipple 2 is the same as that of the pipe body 1, and the pipe end is provided with an external thread structure 2-1 which is completely the same as the end face of the pipe body.
In a specific embodiment, the assembly nipple 2 is machined with a positioning shoulder 2-2, and the outer diameter of the positioning shoulder 2-2 is larger than or equal to that of the coupling 3.
In one particular embodiment, the axial length of fitting sub 2 from the pipe end to locating shoulder 2-2 is 1/2 of the axial length of collar 3.
In one embodiment, the O-ring 6 is made of butadiene-acrylonitrile rubber and has a diameter of 1.2 mm.
In one embodiment, the sealing thread structure of the oil pipe and casing combination is characterized in that the coupling 3 is in threaded connection with the assembly nipple 2 before the pipe body 1 is in threaded connection with the coupling 3.
In a specific embodiment, the threaded connection control standard of the coupling 3 and the assembly nipple 2 is that the clearance between the end face of the coupling and the positioning shoulder 2-2 of the assembly nipple is less than or equal to 0.01 mm.
In one embodiment, a sealing thread structure for a tubing and casing combination, when the external thread 1-1 of the tube body 1 is screwed into the coupling 3, the length of the nose shoulder side 1/2 of the threaded section is uniformly coated with anti-thread-sticking tubing thread grease 5, and the length of the tube body side 1/2 of the threaded section is uniformly coated with locking tubing thread grease 4.
In a specific embodiment, the qualified criteria of the external thread 1-1 of the pipe body when the coupling 3 is screwed in are as follows: the upper buckling torque value reaches a preset value and a nose-shoulder touch signal appears on a torque curve.
In one embodiment, the sealing thread structure of the oil pipe and casing pipe combination is characterized in that after a coupling 3 is screwed in through an external thread 1-1 of a pipe body, an assembly nipple 2 is removed, a sealing ring 6 is placed in a sealing groove 1-3 on the end face of a nose shoulder of the pipe body, and the assembly at a factory end is completed.
In one embodiment, the assembly nipple 2 can be reused for a plurality of times by using a sealing thread structure of a combination of an oil pipe and a casing.
The sealing thread structure of the oil pipe and casing combination provided by the embodiment of the application is described in detail above. The above description of the embodiments is only for the purpose of helping to understand the method of the present application and its core ideas; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
As used in the specification and claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect. The description which follows is a preferred embodiment of the present application, but is made for the purpose of illustrating the general principles of the application and not for the purpose of limiting the scope of the application. The protection scope of the present application shall be subject to the definitions of the appended claims.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The foregoing description shows and describes several preferred embodiments of the present application, but as aforementioned, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the application as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.
Claims (9)
1. A seal thread construction of a tubing and casing combination, the seal thread construction of a tubing and casing combination comprising:
the pipe comprises a pipe body, a coupling, an assembling short joint and a sealing ring;
an external thread is processed at the end part of the pipe body, a nose shoulder is processed at the front end of the external thread, and a sealing groove is processed on the end surface of the nose shoulder;
the coupling is of a left-right axial symmetric structure, internal threads matched with the external threads of the pipe body are respectively processed at two ends of the coupling, and a hollow cylindrical section is processed in the middle of the coupling;
the assembly pup joint is an external thread joint with a positioning shoulder, and external threads are matched with internal threads of the coupling; the end threads of the pipe body are in assembly connection with the coupling;
the sealing ring is placed in the sealing groove on the end face of the nose shoulder.
2. The tubing and casing combination seal thread formation of claim 1, further comprising an anti-run lock thread grease and an anti-run oil casing thread grease disposed simultaneously between the body end threads and the coupling.
3. The combined sealed thread construction of oil pipe and casing of claim 1, wherein the threads at both ends of the pipe body are API threads or non-API special threads.
4. The oil pipe and casing combined sealing thread structure of claim 1, wherein the cross-sectional thickness of the pipe body end face nose shoulder is greater than or equal to 2.5mm, and the axial length is less than or equal to 4 mm.
5. The oil pipe and casing combined sealing thread structure as claimed in claim 1, wherein a sealing groove is arranged at the center of the wall thickness of the end face of the nose shoulder of the pipe body, the width of the sealing groove is less than or equal to 1/2 of the section thickness, and the axial depth is 3/4 of the width of the sealing groove.
6. The seal thread structure of the oil pipe and casing combination according to claim 1, wherein the inner diameter of the hollow cylindrical section in the coupling is 0.2 to 0.6mm larger than the outer diameter of the external thread nose shoulder, and the axial length is less than 2 times the axial length of the external thread nose shoulder, which is 0.2 to 0.3 mm.
7. The combined sealed thread structure of oil pipe and casing according to claim 1, wherein the assembly nipple is machined with a positioning shoulder, and the outer diameter of the positioning shoulder is greater than or equal to the outer diameter of the coupling.
8. The tubular and casing combination sealed thread construction of claim 1 wherein the axial length of the assembly sub from the tubular end to the locating shoulder is 1/2 of the axial length of the collar.
9. The oil pipe and casing combined sealing thread structure of claim 1, wherein the sealing ring is O-shaped, made of butadiene acrylonitrile rubber, and has a diameter equal to the width of the sealing groove.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2021225260499 | 2021-10-20 | ||
| CN202122526049 | 2021-10-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216714321U true CN216714321U (en) | 2022-06-10 |
Family
ID=81882599
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123100148.7U Active CN216714321U (en) | 2021-10-20 | 2021-12-10 | Sealing thread structure for oil pipe and casing pipe combination |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216714321U (en) |
-
2021
- 2021-12-10 CN CN202123100148.7U patent/CN216714321U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103696705B (en) | The oil casing threaded magnitude of interference control method of partially trapezoidal special buckle threaded stone | |
| CN114658371A (en) | Oil pipe and sleeve combined sealing thread structure and factory end assembling method | |
| CN216714321U (en) | Sealing thread structure for oil pipe and casing pipe combination | |
| CN201322147Y (en) | Connection structure for small-clearance collar and casing threads | |
| CN108049836B (en) | Pressurized SAGD wellhead replacement device and replacement method thereof | |
| CN210714497U (en) | Double-layer combined sleeve | |
| CN113513284A (en) | Compact shale gas production wellhead assembly | |
| CN202249887U (en) | Cable-penetrating thermal recovery wellhead device for electric submersible pump | |
| CN217632307U (en) | Economical oil and casing thread structure | |
| US11940064B2 (en) | Threaded tubular connection | |
| US11982166B2 (en) | System for segmented simultaneous water injection and oil recovery through double pipes in horizontal section | |
| CN210033313U (en) | Sealing ring and oil pumping pipe inserting pipe system | |
| CN103541681A (en) | High-temperature-resistant high-pressure-resistant cross-class compression type seal component for bushes and barefoot wells | |
| CN209764342U (en) | Thermal recovery packing element locking test device | |
| CN110029936B (en) | Injection-type double-layer drill string anti-deviation straight drilling tool | |
| CN108756773B (en) | Directly-connected oil casing threaded joint structure | |
| CN201412077Y (en) | Negative-buckle threaded sleeve similar to trapezoid | |
| CN109538194B (en) | Coiled tubing underground quick leakage finding process pipe column and using method | |
| CN212716524U (en) | Universal simple anti-deviation casing head for new and old wells | |
| CN201095968Y (en) | Slips type casing tube buckle connected simple casing head | |
| CN203905890U (en) | High temperature and high pressure resistant ultra-pound class compressive seal assembly suitable for casing pipe and uncased hole | |
| CN213711001U (en) | Device for improving hydraulic pumping efficiency | |
| CN221053674U (en) | Balanced pressure assembly | |
| CN203129973U (en) | Small-dimension drill stem | |
| CN219474864U (en) | Pressure testing tool for high-temperature high-pressure packer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |