CN114087459B - End-to-end connection method for pipeline with inner corrosion-resistant layer - Google Patents
End-to-end connection method for pipeline with inner corrosion-resistant layerInfo
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- CN114087459B CN114087459B CN202111389710.4A CN202111389710A CN114087459B CN 114087459 B CN114087459 B CN 114087459B CN 202111389710 A CN202111389710 A CN 202111389710A CN 114087459 B CN114087459 B CN 114087459B
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- corrosion
- pipeline
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/08—Coatings characterised by the materials used by metal
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
本发明提供一种带有内耐蚀层的管路端对端连接方法，涉及油套管技术领域，能够克服带耐蚀层的管路端对端螺纹连接时的反扭矩松扣、台肩面对顶不到位或现场端上扣扭矩不足的问题，实现管串精确有效连接及防腐蚀的整体性；该方法针对内层为耐蚀合金的双金属管体，在管体端面设耐蚀合金层；在带内耐蚀层管路端部、装配短节上加工外螺纹，接箍两端对称加工内螺纹；接箍第一端与装配短节连接，旋进至装配短节定位位置；第一段管路外螺纹上涂防松紧固和防粘扣油套管螺纹脂并与接箍第二端连接，旋进至与装配短节接触；拆除装配短节；在第二段管路外螺纹上涂防粘扣油套管螺纹脂并与接箍第一端连接，旋进至与第一段带内耐蚀层管路端接触。
The invention provides a method for end-to-end connection of pipelines with inner corrosion-resistant layers, which relates to the technical field of oil casing and can overcome the problems of loose buckle due to reverse torque, failure of shoulder surface to top in place or insufficient buckle torque at the on-site end during end-to-end threaded connection of pipelines with corrosion-resistant layers, so as to achieve accurate and effective connection of pipe strings and the integrity of corrosion protection; the method is for a bimetallic pipe body whose inner layer is a corrosion-resistant alloy, and a corrosion-resistant alloy layer is provided on the end face of the pipe body; external threads are processed on the end portion of the pipeline with the inner corrosion-resistant layer and the assembly short section, and internal threads are symmetrically processed at both ends of the coupling; the first end of the coupling is connected to the assembly short section and screwed into the positioning position of the assembly short section; anti-loosening and anti-sticking oil casing thread grease is applied to the external threads of the first section of the pipeline and connected to the second end of the coupling and screwed into contact with the assembly short section; the assembly short section is removed; anti-sticking oil casing thread grease is applied to the external threads of the second section of the pipeline and connected to the first end of the coupling and screwed into contact with the end of the first section of the pipeline with the inner corrosion-resistant layer.
Description
Technical Field
The invention relates to the technical field of oil casings, in particular to an end-to-end connection method of an oil casing with an inner corrosion resistant layer.
Background
Due to severe corrosion of the service environment of the oil and gas field, uniform corrosion and pitting corrosion perforation failure frequently occur on the inner wall of the oil pipe, and corrosion perforation occurs on some oil pipes even for several months. According to the H 2 S partial pressure, CO 2 partial pressure, cl-mass concentration, temperature, pressure and liquid flow conditions in the environment, the selected corrosion resistant alloy materials are low-carbon alloy steel, martensitic stainless steel, duplex stainless steel, iron-corrosion resistant alloy and corrosion resistant alloy according to the sequence of stronger corrosion resistance. For the high-temperature and high-pressure natural gas fields containing H 2S、CO2, cl < - > and the like in northeast and Tarim of Sichuan, martensitic stainless steel pipes (super 13 Cr) and corrosion-resistant alloy pipes (825 and G3) are mostly selected at present, but stress corrosion cracking failure of the super 13Cr oil pipe frequently happens, and the pure corrosion-resistant alloy oil pipe is very expensive and has high cost and difficult popularization and use. The bimetal composite oil pipe can greatly reduce the cost of the corrosion-resistant oil pipe, organically combines the high strength of the outer-layer carbon steel with the corrosion resistance of the inner-layer corrosion-resistant alloy, improves the performance, reduces the cost and is widely applied.
Although the corrosion problem is effectively solved by the in-band corrosion-resistant pipe line, the problem of easy corrosion still exists in the threaded connection part, and the problem of corrosion of the threaded connection part is solved, so that the corrosion resistance of the whole pipe string is realized, and the problem to be solved is currently needed. The anti-corrosion of the inner wall of the pipe string is carried out by adopting opposite-top type threads through contact between anti-corrosion inner layers of the bimetallic pipe, and the problems that whether two sections of metal pipes which are connected with each other can be effectively contacted or not, friction force generated on the top surface can cause the thread connection on the other side to be loosened, and the external threads on the site end cannot be buckled in place due to the interference of the external threads on the factory end, so that the buckling torque is insufficient exist.
Accordingly, there is a need to develop an end-to-end connection method for oil casings with inner corrosion resistant layers that addresses the deficiencies of the prior art and solves or alleviates one or more of the problems discussed above.
Disclosure of Invention
In view of the above, the invention provides an end-to-end connection method for oil casings with inner corrosion resistant layers, which can solve the problems of insufficient reactive torque loose buckling, shoulder surface not in place in the process of threaded connection of opposite-top type pipelines with inner corrosion resistant layers or insufficient buckling torque at the site end in the prior art, realize accurate and effective connection of pipeline strings with inner corrosion resistant layers, realize the integrity of corrosion resistance of bimetallic pipe strings, and ensure the corrosion resistance of the whole pipe strings.
The invention provides an end-to-end connection method of an oil casing pipe with an inner corrosion resistant layer, which realizes connection between pipelines with the opposite-top type corrosion resistant layer to be in-band, and comprises the following steps of:
During factory processing and assembly:
s1, machining external threads on the end parts of two sections of pipelines to be connected and an assembly nipple for positioning, and symmetrically machining internal threads on the inner walls of the two ends of a connecting coupling;
s2, connecting the first end of the connecting coupling with the assembly nipple in a threaded manner, wherein the threaded screwing-in position reaches the positioning position of the assembly nipple;
S3, smearing anti-loosening fastening oil sleeve thread grease and anti-buckling oil sleeve thread grease on external threads of the first section of pipeline in a sectional manner, connecting the anti-loosening fastening oil sleeve thread grease with the second end threads of the connecting coupling, and screwing the anti-loosening fastening oil sleeve thread grease into the end face of the coupling to be in contact with the assembly nipple;
on-site assembly and time-setting:
s4, dismantling the assembly pup joint;
S5, smearing anti-sticking oil sleeve thread compound on the external thread of the second section of pipeline, and screwing the anti-sticking oil sleeve thread compound into contact with the first end of the connecting coupling.
In step S3, the purpose of smearing the anti-loosening fastening oil sleeve thread compound is to connect with the threads of the fixed factory end, so that the threads connected with the ends are prevented from rotating anticlockwise and loosening due to reactive torque generated by end surface contact when the threads are buckled on site (namely, the first end and the second section of pipeline of the connecting coupling are buckled).
In the aspect and any possible implementation manner as described above, there is further provided an implementation manner, wherein a positioning shoulder is provided on an outer surface of the assembly nipple, and an outer diameter at the positioning shoulder is larger than an outer diameter at an external thread of the assembly nipple;
In step S2, the assembly nipple is threaded until the first end face of the connection collar contacts the locating shoulder.
In the aspect and any possible implementation manner as described above, there is further provided an implementation manner, wherein the external thread on the two-section pipeline is arranged in a frustum shape;
Correspondingly, the external threads of the assembly nipple are identical to the frustum-shaped external threads of the two sections of pipelines, and are matched with the internal threads of the connecting coupling.
In aspects and any one of the possible implementations described above, there is further provided an implementation in which the distance between the threaded end face of the make-up sub and the locating shoulder is equal to 1/2 of the length of the connecting collar. The length is set to ensure that the threads of the pipe body at the first end and the second end are all up to half of the coupling, thereby solving the problems of insufficient butt joint and insufficient torque for on-site end make-up.
In the aspect and any possible implementation manner described above, there is further provided an implementation manner, where the two sections of the pipeline to be connected each include an outer metal pipe and an inner metal pipe;
the inner metal pipe of the end to be connected protrudes 3mm-6mm compared with the outer metal pipe, and the protruding part of the inner metal pipe is welded with a corrosion-resistant metal layer;
the corrosion-resistant metal layer is connected with the ends of the inner metal tube and the outer metal tube at the same time.
In the aspect and any possible implementation manner described above, there is further provided an implementation manner, wherein the material of the corrosion-resistant metal layer is fused with the outer metal tube and the inner metal tube.
In the aspect and any possible implementation manner, there is further provided an implementation manner, wherein the difference of the section thickness of the pipeline generated by the frustum is equal to or greater than 2mm, and the axial length is equal to or less than 4mm.
In the aspect and any possible implementation manner, further provided is an implementation manner, wherein the contact between the first end face of the connecting coupling and the positioning shoulder is that a gap between the first end face of the connecting coupling and the positioning shoulder of the assembly nipple is less than or equal to 0.01mm.
In the aspect and any possible implementation manner described above, there is further provided an implementation manner, wherein the qualification criterion of the external threads of the first section of pipeline and the second section of pipeline when screwing in the connecting collar is that the make-up torque value reaches a preset value and a nose shoulder touch signal appears on a torque curve. A nose end is respectively machined on the outer thread end surfaces of the two pipe bodies, and when the outer thread end surfaces of the two pipe bodies are contacted, namely after the nose ends touch, the buckling torque curve is rapidly increased in a vertical line mode, and the nose end contact signal is used as a nose shoulder touch signal.
In accordance with aspects and any one of the possible implementations described above, there is further provided an implementation in which, after assembly is completed, the outer surface of the corrosion resistant metal layer is not in contact with the inner surface of the connection collar, forming a hollow cylindrical section within the collar. The outer metal pipe of the pipeline with the inner corrosion resistant layer is not exposed in the hollow cylindrical section in the coupling, and only the corrosion resistant metal layer is exposed, so that the non-corrosion resistant outer metal pipe is not contacted with substances such as oil gas and the like conveyed in the pipe.
Compared with the prior art, one of the technical proposal has the advantages that the problem that the counter torque is loose and the shoulder surface is not propped in place when the pipe string threaded connection in the site is assembled is solved by accurately controlling the screwing position of the factory end threaded connection;
The other technical proposal has the advantages that the taper-shaped structure is adopted to lead the nose contact surface of the threaded connection to form stable contact pressure, thereby realizing effective connection and solving the corrosion prevention problem of the threaded connection part;
The other technical scheme has the advantages that the corrosion-resistant metal layer is welded by removing part of the outer tube of the pipeline with the inner corrosion-resistant layer, so that the contact surface on the opposite side is made of corrosion-resistant alloy, the corrosion resistance of the whole pipeline is guaranteed, the contact surface on the opposite side refers to the contact surface between the end faces of two sections of external threaded joints, and if the end face corrosion-resistant metal welding treatment is not carried out, the outer layer corrosion-resistant pipe body can be contacted with a medium conveyed in the pipeline to generate corrosion because the inner corrosion-resistant alloy layer is thinner and chamfering is required to be processed.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed 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 that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a threaded connection structure of a bimetal composite oil casing according to an embodiment of the present invention.
Wherein, in the figure:
1. a pipeline with an inner corrosion resistant layer; 2, an assembling nipple, 3, a coupling, 4, a corrosion-resistant alloy layer, 5, anti-loosening fastening oil casing thread grease, 6, anti-buckling oil casing thread grease;
1-1 parts of a tube body outer layer matrix, 1-2 parts of a tube body inner layer matrix, 1-3 parts of a tube body outer thread, 1-4 parts of a tube body outer thread nose shoulder;
2-1, assembling the external screw thread of the pup joint, 2-2, assembling the positioning shoulder of the pup joint;
3-1, internal threads of the coupling, 3-2, and a hollow cylindrical section in the coupling.
Detailed Description
For a better understanding of the technical solution of the present invention, the following detailed description of the embodiments of the present invention refers to the accompanying drawings.
It should be understood that the described embodiments are merely some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Aiming at the problem that the threaded connection part of the pipeline with the inner corrosion resistant layer is easy to corrode in the prior art, the invention provides the high-efficiency and simple threaded connection structure, and solves the problems that reactive torque is loose and the shoulder surface is not in place when the threaded connection of the pipeline string is assembled on site by precisely controlling the screwing-on position of the threaded connection at the factory end, so that the nose contact surface of the threaded connection forms stable contact pressure, thereby effectively solving the corrosion prevention problem of the threaded connection part and realizing the corrosion prevention of the whole pipeline string.
A bimetal composite oil and sleeve threaded connection structure and a factory end assembly method comprise a pipeline, a common carbon steel coupling, anti-loosening fastening oil sleeve thread grease, anti-buckling oil sleeve thread grease and an assembly nipple, wherein an external thread is processed at the end of the pipeline, a nose shoulder is processed at the front end of the external thread, the carbon steel coupling is of a laterally axially symmetrical structure, internal threads matched with the external thread of the pipeline are respectively processed at two ends of the carbon steel coupling, and a hollow cylindrical section is processed in the middle of the coupling.
As a specific implementation mode, the pipeline outer layer substrate is made of common carbon steel, the yield strength is 55 ksi-110 ksi, and the thickness is 5.5-12.7 mm. The pipeline inner layer substrate is made of corrosion-resistant alloy materials not limited to stainless steel, the yield strength is 45 ksi-105 ksi, and the thickness is 0.5-4.5 mm. The combination mode of the pipeline is not limited to hydraulic combination, blasting combination, metallurgical combination and the like.
The threads at the two ends of the pipeline can be API threads or non-API special threads.
Specifically, the thickness of the section of the nose shoulder of the end face of the pipeline is more than or equal to 2mm, and the axial length is less than or equal to 4mm.
The end face of the pipeline is firstly subjected to turning or other machining modes to remove the axial length of the outer carbon steel matrix layer to be more than or equal to 3mm, then a corrosion-resistant alloy layer which is a certain thickness and is fused with the outer matrix and the inner matrix is welded, the thickness of the corrosion-resistant alloy layer is more than 0.5-1.0 mm of the thickness of the nose shoulder, and the axial length is flush with the end face of the inner corrosion-resistant alloy matrix.
The axial length of the corrosion-resistant alloy layers welded on the end surfaces of the two ends of the pipeline is smaller than or equal to the length of the nose shoulder of the external thread.
The thread structures at the two ends of the pipeline are machined after the corrosion-resistant alloy coating welding of the pipe ends is completed.
The coupling internal thread is matched with the pipeline end face external thread.
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 0.2-0.3 mm smaller than the axial length of the external thread nose shoulder.
The material of the assembly nipple is the same as the material of the outer matrix of the pipeline, and the assembly nipple is provided with an external thread structure which is completely the same as the end face of the pipeline.
The assembly nipple is provided with a positioning shoulder, and the outer diameter of the positioning shoulder is larger than or equal to the outer diameter of the coupling.
The axial length of the assembly nipple from the pipe end to the positioning shoulder is 1/2 of the axial length of the coupling.
The bimetal composite oil and sleeve threaded connection structure and the factory end assembly method are characterized in that before a pipeline is in threaded connection with a coupling, the coupling is in threaded connection with an assembly nipple.
The control standard of the threaded connection of the coupling and the assembly nipple is that 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.
According to the bimetal composite oil, the sleeve threaded connection structure and the factory end assembly method, when the external threads of the pipeline are screwed into the coupling, the anti-sticking oil sleeve thread grease is uniformly coated on the length of 2/3 of the nose shoulder side of the thread section, and the locking oil sleeve thread grease is uniformly coated on the length of 1/3 of the tube body side of the thread section. The meaning of 1/3 and 2/3 means that the application area of the corresponding thread compound encompasses 1/3 or 2/3 of this specific position.
The qualification criterion of the external thread of the pipeline when screwing in the coupling is that the screwing-in torque value reaches a preset value and a nose shoulder touch signal appears on a torque curve.
According to the bimetal composite oil and sleeve threaded connection structure and the factory end assembly method, after the external threads of the pipelines are screwed into the coupling, the assembly pup joint is disassembled, and the factory end assembly is completed.
The assembly nipple can be repeatedly used for a plurality of times.
According to the bimetal composite oil, the sleeve threaded connection structure and the factory end assembly method, the corrosion-resistant alloy layer with a certain thickness is welded at the nose and shoulder of the external thread of the pipe body, and corrosion media flowing in the pipe body are isolated through contact pressure of the corrosion-resistant alloy between the nose and the shoulder. The assembly nipple is the same as the bimetal composite outer carbon steel material, has the same thread structure as the external thread of the pipe body, and is provided with a positioning shoulder. When the factory end of the bimetal composite oil and sleeve threaded connection is assembled, the assembly position of the assembly nipple and the coupling is controlled through the positioning shoulder on the assembly nipple, then the anti-sticking oil sleeve thread grease and the locking oil sleeve thread grease are adopted at different thread sections of the bimetal composite oil and sleeve end, and the upper buckling lattice criterion of contact combination of a buckling torque value and the shoulder is adopted, so that the position of the factory end oil sleeve threaded connection is accurately controlled, the precise assembly and fastening fit of the bimetal composite oil and the sleeve threaded connection factory end are realized, the problems that the factory end anti-torque loose buckle and the shoulder surface cannot be in place during the threaded connection assembly of the pipe string on site are effectively solved, the stable contact pressure is formed at the nose end contact surface of the threaded connection, and the integral connection and the anti-corrosion function of the whole pipe string are effectively solved.
Example 1:
The structure of this embodiment is shown in fig. 1. The bimetal composite oil and casing threaded connection structure comprises a pipeline 1, an assembly nipple 2, a coupling 3 made of common carbon steel, a corrosion-resistant alloy layer 4, anti-loosening fastening oil casing thread grease 5 and anti-buckling oil casing thread grease 6, wherein the pipeline 1 is formed by compounding an outer layer base body 1-1 and an inner layer base body 1-2, an outer pipe thread 1-3 is machined at the end part of the pipeline, a nose shoulder 1-4 of the outer pipe thread is machined at the front end of the outer pipe thread, the coupling 3 is of a laterally symmetrical structure, internal threads 3-1 matched with the outer pipe thread are machined at the two ends of the coupling 3, a hollow cylindrical section 3-2 is machined in the middle of the coupling 3, the assembly nipple 2 is an external thread joint with the positioning shoulder 2-2, and the anti-loosening fastening oil casing thread grease 5 and the anti-buckling oil casing thread grease 6 are required to be used simultaneously when the outer pipe thread 1-3 at the end part of the pipeline is assembled with the coupling 3.
The outer layer matrix 1-1 of the pipe body is made of common carbon steel, the yield strength is 55 ksi-110 ksi, and the thickness is 5.5-12.7 mm.
The inner layer substrate 1-2 of the pipe body is made of corrosion-resistant alloy material not limited to stainless steel, the yield strength is 45 ksi-105 ksi, and the thickness is 0.5-4.5 mm.
The compounding mode of the pipeline 1 is not limited to hydraulic compounding, blasting compounding, metallurgical compounding and the like.
The external threads 1-3 of the tube may be API threads or non-API specific threads.
The thickness of the section of the external thread nose shoulder 1-4 of the pipe body is more than or equal to 2.5mm, and the axial length is less than or equal to 6mm.
The axial length of the outer layer matrix 1-1 of the carbon steel pipe body is greater than or equal to 3mm by adopting turning or other machining modes at the end surfaces at the two ends of the pipeline 1, then the corrosion-resistant alloy layer 4 which is fused with the outer layer matrix 1-1 of the carbon steel pipe body and the inner layer matrix 1-2 of the carbon steel pipe body is welded in a certain thickness, the thickness of the corrosion-resistant alloy layer 4 is greater than the thickness of the threaded nose shoulder 1-4 outside the carbon steel pipe body by 0.5-1.0 mm, and the axial length is flush with the end surface of the inner corrosion-resistant alloy matrix 1-2.
The axial length of the corrosion-resistant alloy layer 4 welded on the end surfaces of the two ends of the pipeline is less than or equal to the length of the external thread nose shoulder 1-4.
The thread structures at the two ends of the pipeline are machined after the pipe end corrosion-resistant alloy layer 4 is welded.
The coupling is made of carbon steel, and the yield strength of the strong material is greater than or equal to that of the outer layer matrix 1-1 of the pipeline.
The coupling internal thread 3-1 is matched with the pipe external thread 1-3.
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 1-4, and the axial length is 0.2-0.3 mm smaller than the axial length of the external thread nose shoulder 1-4.
The material of the assembly nipple 2 is the same as that of the outer matrix 1-1 of the pipe body, and the pipe end is provided with an external thread 2-1 of the assembly nipple which is completely the same as the end face of the pipe.
The assembly nipple 2 is provided with an assembly nipple positioning shoulder 2-2, and the outer diameter of the assembly nipple positioning shoulder 2-2 is larger than or equal to the outer diameter of the coupling 3.
The axial length of the assembly nipple 2 from the end face of the pipe body to the assembly nipple positioning shoulder 2-2 is 1/2 of the axial length of the coupling 3.
In this embodiment, coupling 3 is threadedly connected to nipple 2 prior to threaded connection of pipe 1 to coupling 3. The control standard of the threaded connection of the coupling 3 and the assembly nipple 2 is that the clearance between the coupling end face and the positioning shoulder 2-2 of the assembly nipple is less than or equal to 0.01mm. When the pipe body external thread 1-3 of the pipeline 1 is screwed into the coupling 3, the length of the nose shoulder side 2/3 of the thread section is uniformly coated with anti-sticking oil sleeve thread grease 6, and the length of the pipe body side 1/3 of the thread section is uniformly coated with anti-loosening fastening oil sleeve thread grease 5. The qualification criterion of the external thread 1-3 of the pipe body when the coupling 3 is screwed in is that the screwing-on torque value reaches a preset value and a nose shoulder touching signal appears on a torque curve. After the external thread 1-3 of the pipe body is screwed into the coupling 3, the assembly nipple 2 is disassembled, and the factory end assembly is completed. The assembly nipple 2 can be reused for a plurality of times.
Before the pipeline end is in threaded connection with the coupling, the coupling and the assembly nipple accurately control the end face position of the assembly nipple through the positioning shoulder, when the pipeline factory end is assembled with the coupling, the assembly nipple accurately controls the buckling position and the buckling torque of the factory end, and during assembly, the locking fastening oil sleeve thread grease and the anti-buckling oil sleeve thread grease are required to be used simultaneously to realize connection and stability of the threaded connection factory end (the on-site assembly end is not coated with the locking fastening oil sleeve thread grease 5 and is coated with the anti-buckling oil sleeve thread grease to realize sealing), so that the problems that the anti-torque loose buckle and the nose shoulder are not in place due to the fact that a factory end connected structure possibly occurs during threaded connection assembly of a pipe string in the site are effectively solved, and the stable contact pressure is formed on the joint surface of the threaded connection nose end, so that the integral connection and the anti-corrosion function of the whole pipe string are ensured.
The end-to-end connection method of the oil casing with the inner corrosion resistant layer provided by the embodiment of the application is described in detail. While the foregoing examples have been provided to assist those of ordinary skill in the art in understanding the methods and concepts underlying the application, those skilled in the art will recognize that there may be variations in the embodiments and applications of the application in light of the foregoing, and that the application is not to be construed as limited to what is described herein.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product 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 product or system. Without further limitation, an element defined by the phrase "comprising one of the elements" does not exclude the presence of additional identical elements in a commodity or system comprising the element. By "substantially" is meant that within an acceptable error range, a person skilled in the art is able to solve the technical problem within a certain error range, substantially achieving the technical effect.
The terminology used in the embodiments of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application 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 the present application, the terms "upper", "lower", "left", "right", "inner", "outer", "middle", and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings. In addition to the above terms may be used to denote orientation or positional relationships, other meanings may be used, such as the term "upper" may also be used in some cases to denote some sort of attachment or connection. The specific meaning of these terms in the present application will be understood by those of ordinary skill in the art according to the specific circumstances. The term "and/or" as used herein is merely an association relationship describing the associated object, and means that three relationships may exist, for example, a and/or B, and may mean that a exists alone, while a and B exist alone, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
Claims (8)
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| CN202111389710.4A CN114087459B (en) | 2021-11-22 | 2021-11-22 | End-to-end connection method for pipeline with inner corrosion-resistant layer |
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| CN114352211A (en) * | 2021-12-23 | 2022-04-15 | 西安德信成科技有限责任公司 | A kind of sealing thread connection assembly method of oil pipe and casing combination |
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| CN110043196A (en) * | 2019-04-11 | 2019-07-23 | 中国石油天然气集团有限公司 | A kind of oil well pipe male connection end face seal coil structures and its assembly method |
| CN216715610U (en) * | 2021-11-22 | 2022-06-10 | 西安德信成科技有限责任公司 | End-to-end pipeline connecting structure with inner corrosion-resistant layer |
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|---|---|---|---|---|
| DE102009050719A1 (en) * | 2009-10-26 | 2011-05-12 | H. Butting Gmbh & Co. Kg | Threaded sleeve, delivery pipe and system on threaded sleeve and delivery pipe |
| CN201836559U (en) * | 2010-11-04 | 2011-05-18 | 李芙蓉 | Thread seal joint for connecting bimetal tube with external diameter being not less than 30mm |
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2021
- 2021-11-22 CN CN202111389710.4A patent/CN114087459B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110043196A (en) * | 2019-04-11 | 2019-07-23 | 中国石油天然气集团有限公司 | A kind of oil well pipe male connection end face seal coil structures and its assembly method |
| CN216715610U (en) * | 2021-11-22 | 2022-06-10 | 西安德信成科技有限责任公司 | End-to-end pipeline connecting structure with inner corrosion-resistant layer |
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| CN114087459A (en) | 2022-02-25 |
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