CN119957739A - An expandable threaded connection mechanism, an expansion pipe, and a patching process pipe column and method - Google Patents
An expandable threaded connection mechanism, an expansion pipe, and a patching process pipe column and method Download PDFInfo
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- CN119957739A CN119957739A CN202311479648.7A CN202311479648A CN119957739A CN 119957739 A CN119957739 A CN 119957739A CN 202311479648 A CN202311479648 A CN 202311479648A CN 119957739 A CN119957739 A CN 119957739A
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Abstract
本发明公开了一种可膨胀螺纹连接机构、膨胀管及补贴工艺管柱和方法。包括公扣和母扣；公扣设有公扣螺纹丝扣和公扣前端直台；母扣设有母扣螺纹丝扣、应力槽、母扣根部直台、密封槽；密封槽和应力槽均设于母扣根部直台；母扣根部直台和公扣前端直台抵接；应力槽内设有凸起部，凸起部与公扣前端直台抵接；密封槽内设有密封件，密封槽通过密封件与公扣前端直台密封配合；螺纹连接机构受力膨胀后，公扣自由端收缩变形的长度小于密封槽到母扣根部的距离。能够保证在膨胀后母扣和公扣的密封能力，避免公扣螺纹丝扣与母扣螺纹丝扣发生脱离，阻止高压气体或高压流体泄漏，进一步保证膨胀管之间的密封连接效果，保证其正常作业。
The invention discloses an expandable threaded connection mechanism, an expansion pipe, and a pipe column and method for patching a process. It includes a male buckle and a female buckle; the male buckle is provided with a male buckle thread thread and a male buckle front end straight platform; the female buckle is provided with a female buckle thread thread, a stress groove, a female buckle root straight platform, and a sealing groove; the sealing groove and the stress groove are both provided at the female buckle root straight platform; the female buckle root straight platform and the male buckle front end straight platform abut each other; a protrusion is provided in the stress groove, and the protrusion abuts against the male buckle front end straight platform; a sealing member is provided in the sealing groove, and the sealing groove is sealed with the male buckle front end straight platform through the sealing member; after the threaded connection mechanism is subjected to force expansion, the length of the male buckle free end shrinking and deforming is less than the distance from the sealing groove to the female buckle root. It can ensure the sealing ability of the female buckle and the male buckle after expansion, avoid the male buckle thread thread from being separated from the female buckle thread thread, prevent the leakage of high-pressure gas or high-pressure fluid, further ensure the sealing connection effect between the expansion pipes, and ensure its normal operation.
Description
Technical Field
The invention relates to the technical field of pipe fitting connection, in particular to an expandable threaded connection mechanism, an expansion pipe, a patch process pipe column and a patch process method.
Background
At present, with the vigorous development of shale oil, shale gas and coal bed gas of various large oil-gas fields, the casing damage caused by factors such as geological conditions, large-scale volume pressure and the like occurs, the expansion pipe repairing and casing repairing technology is favored by various large oil fields due to the advantages of high bearing performance, long sealing and isolating effective period, large internal drift diameter after repairing and the like, powerful technical support is provided for the implementation of shaft integrity reconstruction and large-scale volume fracturing, and guarantee is provided for the production of shale gas oil gas, coal bed gas and other resources and national energy strategic safety.
In the treatment process of casing damage of shale oil, shale gas, coal bed gas and the like, the condition of underground casing damage is found to be different, and single-point casing damage is easy to develop into multi-point and long-section casing damage in the process of repairing a well through a channel most of the time. Because the expansion pipe is limited by the length of the expansion pipe, a transport vehicle and the like, the sleeve damage patch (> 10 m) for a long section is required to be adopted, a plurality of expansion pipes are connected through threads on site, and then the expansion pipe is put into a preset position in the pit to carry out expansion patch construction, so that the underground requirement can be met.
The expansion pipes are generally connected by adopting threads, and the threads are required to keep good sealing performance and high connection strength before and after expansion and in the expansion process. However, in the expansion process, the rebound amounts of the pin and the box of the connecting thread of the expansion pipe are not completely consistent after expansion, the contact between the sealing sections of the pin and the box is weakened and even separated, the sealing capability is rapidly reduced, and the gap between the pin and the internal and external threads of the box is also changed due to the same reasons, so that the high hydraulic pressure cannot be born, the threads leak, and the whole expansion process is possibly stopped.
Disclosure of Invention
The embodiment of the application provides an expandable threaded connection mechanism, an expansion pipe, a patch process pipe column and a patch process method, which are used for solving the problem of sealing failure after expansion of the connecting threads of the expansion pipe.
In a first aspect, an embodiment of the present application provides an expandable threaded connection, including a pin and a box;
The male buckle is provided with a male buckle thread and a male buckle front end straight table, and the male buckle front end straight table is positioned between the male buckle thread and a male buckle free end;
The female buckle is provided with a female buckle thread, a stress groove, a female buckle root straight table and a sealing groove, wherein the female buckle root straight table is arranged between the female buckle thread and the female buckle root;
the male thread is matched with the female thread;
The straight base at the root of the female buckle is abutted with the straight base at the front end of the male buckle;
a protruding part is arranged in the stress groove and is abutted with the straight table at the front end of the male buckle;
a sealing element is arranged in the sealing groove, and the sealing groove is in sealing fit with the straight table at the front end of the male buckle through the sealing element;
after the threaded connection mechanism is stressed and expanded, the length of the shrinkage deformation of the free end of the pin buckle is smaller than the distance from the sealing groove to the root of the box buckle.
In one or some optional implementations of the embodiment of the present application, a side surface of the free end of the pin and a side surface of the root of the box form an axial interference fit.
In one or some optional implementations of the embodiment of the present application, the female buckle is further provided with a tool retracting groove;
the tool withdrawal groove is arranged between the female thread screw thread and the stress groove.
In one or some optional implementations of the embodiment of the present application, the straight boss at the front end of the pin buckle is provided with a recess corresponding to the boss, and the recess and the boss form interference fit.
In one or some optional implementations of the embodiment of the application, the protruding portion is an arc-shaped boss, and the arc-shaped boss is disposed in the middle of the stress groove.
In one or some optional implementations of the embodiments of the present application, the male thread and the female thread are left-handed threads.
In one or some optional implementations of the embodiments of the present application, the pin thread and the box thread are buttress threads.
In one or some alternative implementations of the embodiments of the application, the seal is a seal ring.
In one or some optional implementations of the embodiment of the present application, the sealing ring is made of fluororubber or perfluoroether rubber.
In a second aspect, an embodiment of the present application provides an expansion pipe, including an expansion pipe body and the expandable threaded connection mechanism;
the male buckle and the female buckle are respectively arranged at two ends of the expansion pipe body.
In a third aspect, an embodiment of the present application provides an expansion pipe patch process pipe string, including a plurality of expansion pipes;
and each expansion pipe is connected with the corresponding expansion pipe through male buckles and female buckles in a threaded manner.
In a fourth aspect, an embodiment of the present application provides an expansion pipe repairing method, which adopts the expansion pipe repairing process pipe column, and includes the following steps:
according to the number of preset expansion pipes, each expansion pipe is connected with the corresponding expansion pipe through a male buckle and a female buckle in a threaded manner;
And (3) running the expansion pipe patch process pipe column underground to a preset depth to finish the expansion pipe patch operation.
The technical scheme provided by the embodiment of the application has the beneficial effects that at least:
The embodiment of the application provides an expandable threaded connection mechanism, an expansion pipe and a patch process pipe column and a patch process method. Through set up stress groove and seal groove on the box to set up the bellying in the stress groove, wherein, the seal groove passes through sealing member and the straight platform sealing fit of pin thread front end, and screw thread coupling mechanism atress inflation back, pin thread free end shrink deformed's length is less than the distance of seal groove to the box root. Therefore, after expansion, the free end of the pin is contracted and deformed, the sealing performance of the sealing groove is not affected, the free end of the pin is always in sealing fit with the straight table at the front end of the pin, meanwhile, due to the existence of the stress groove and the protruding part, the stress is effectively released, and meanwhile, after expansion, the protruding part is contracted and effectively extruded with the straight table at the front end of the pin, so that the sealing capability is effectively improved. The sealing capability of the female buckle and the male buckle after expansion can be guaranteed, the separation of the male buckle thread buckle and the female buckle thread buckle is avoided, the leakage of high-pressure gas or high-pressure fluid is prevented, the sealing connection effect between expansion pipes is further guaranteed, and the normal operation of the expansion pipes is guaranteed.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application. The objectives and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.
The technical scheme of the application is further described in detail through the drawings and the embodiments.
Drawings
The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate the application and together with the embodiments of the application, serve to explain the application. In the drawings:
FIG. 1 is a schematic view of an expandable threaded connection according to an embodiment of the present application;
FIG. 2 is a schematic diagram of an expandable threaded connection according to an embodiment of the present application after expansion;
Reference numerals illustrate:
1. Pin, 101, bearing surface, 102, guiding surface, 2, box, 3, pin thread, 4, box thread, 5, pin free end, 6, pin front end straight table, 7, stress groove, 701, bulge, 8, sealing groove, 801, sealing element, 9, tool withdrawal groove, 10, box root, 11, expansion tool, A, length of pin free end contraction deformation.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It should be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should also be understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
As used in the present description and the appended claims, the term "if" may be interpreted as "when..once" or "in response to a determination" or "in response to detection" depending on the context. Similarly, the phrase "if a determination" or "if a [ described condition or event ] is detected" may be interpreted in the context of meaning "upon determination" or "in response to determination" or "upon detection of a [ described condition or event ]" or "in response to detection of a [ described condition or event ]".
Furthermore, the terms "first," "second," "third," and the like in the description of the present specification and in the appended claims, are used for distinguishing between descriptions and not necessarily for indicating or implying a relative importance.
Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.
It should be understood that the sequence numbers of the steps in the following embodiments do not mean the order of execution, and the execution order of the processes should be determined by the functions and the internal logic, and should not be construed as limiting the implementation process of the embodiments of the present application.
In order to illustrate the technical scheme of the application, the following description is made by specific examples.
The inventor finds that in the prior art, a threaded connection is generally adopted between expansion pipes, a conventional thread generally comprises a male thread and a female thread, when the conventional thread is not expanded, the thread screw of the male thread is matched with the thread screw of the female thread, the free end of the male thread can be abutted with the root of the female thread, the straight platform of the root of the female thread and the straight platform of the front end of the male thread are abutted to form a sealing surface, so that the female thread and the male thread form a sealed whole, when the conventional thread is expanded, a gap is formed between the straight platform of the root of the female thread and the straight platform of the front end of the male thread due to inconsistent expansion resilience of the straight platform of the root of the female thread, the straight platform of the front end of the male thread is not only shortened, but also can retract radially to a certain extent, so that the free end of the male thread is separated from the root of the female thread, the thread screw of the male thread is separated from the thread, the whole sealing property is damaged, the thread screw is leaked, and the expansion process is possibly stopped.
The present application has been developed by the inventor to solve the problem of seal failure of the expanded threaded connection, and provides an expandable threaded connection, an expansion pipe, and a repair process string and method, which are described in detail below by way of specific examples.
Example 1
Referring to fig. 1 and 2, an expandable threaded connection is provided according to an embodiment of the present application, which includes a pin 1 and a box 2. The male buckle 1 is provided with a male buckle thread 3 and a male buckle front end straight table 6, and the male buckle front end straight table 6 is positioned between the male buckle thread 3 and the male buckle free end 5. The female buckle 2 is provided with a female buckle thread 4, a stress groove 7, a female buckle root straight platform (not labeled in the figure) and a sealing groove 8, the female buckle root straight platform is arranged between the female buckle thread 4 and the female buckle root 10, and the sealing groove 8 and the stress groove 7 are both arranged on the female buckle root straight platform. The pin thread 3 is matched with the box thread 4. The stress groove 7 is internally provided with a protruding part 701, and the protruding part 701 can be abutted with the straight table 6 at the front end of the pin. A sealing element 801 is arranged in the sealing groove 8, and the sealing groove 8 can be in sealing fit with the straight platform 6 at the front end of the pin through the sealing element 801. After the threaded connection mechanism is stressed to expand, the length A of the contraction deformation of the free end of the pin is smaller than the distance from the sealing groove 8 to the root 10 of the box.
In a specific embodiment, the pin 1 and the box 2 may be used for connection between expandable pipes, such as expansion pipes, and rotating the pin 1 and the box 2 to enable the pin thread 3 and the box thread 4 to be engaged with each other, at this time, the expandable pipe is in an unexpanded state, referring to fig. 1, the box root straight stand and the pin front end straight stand 6 are abutted against each other, the protrusion 701 in the stress groove 7 is abutted against the pin front end straight stand 6, and at the same time, the seal groove 8 is in sealing engagement with the pin front end straight stand 6 through the seal 801, so that the pin 1 and the box 2 form a sealed whole. Referring to fig. 2, the expandable pipe is internally driven to axially move by high-pressure fluid or high-pressure gas p, so that the male free end 5 is contracted and deformed, and is separated from the root 10 of the female buckle to a certain extent. The parameters such as the length, the thickness and the like of the male buckle free end 5 and the male buckle front end straight stand 6 are optimally designed in a mode of finite element analysis software and ground test, so that the length A of the male buckle free end in shrinkage deformation is smaller than the distance between the root 10 of the female buckle and the sealing groove 8, and the sealing groove 8 is always in sealing fit with the male buckle front end straight stand 6 after expansion. Meanwhile, due to the existence of the protruding part 701, the stress is effectively released, and the protruding part 701 is retracted after expansion and effectively extruded with the straight platform 6 at the front end of the pin buckle, so that the sealing capability is effectively improved. Although the phenomenon that the male buckle free end 5 is expanded and contracted and deformed cannot be changed, the sealing capability of the female buckle 2 and the male buckle 1 can be ensured after the male buckle free end is contracted and deformed through the embodiment, the male buckle threaded 3 and the female buckle threaded 4 are prevented from being separated, high-pressure gas or high-pressure fluid is prevented from leaking, the sealing connection effect between expandable pipes is further ensured, and the normal operation of the expandable pipes is ensured.
In one embodiment, referring to fig. 1, the sides of the pin free end 5 form an axial interference fit with the sides of the box root 10. After the expansion of the expandable pipe, under the action of high-pressure fluid or high-pressure gas, the pin 1 and the box 2 rebound in the radial direction, but the rebound amounts are different. Referring to fig. 2, since the pin free end 5 is restrained by the non-end portion, the rebound deformation is greater than that of the root portion 10 of the female buckle, so that the straight stand 6 at the front end of the pin is not only shortened, but also radially retracted to a certain extent, so that the pin free end 5 is separated from the root portion 10 of the female buckle, and therefore, the rebound deformation of the pin free end 5 is reduced by a certain constraint in the rebound process of the pin free end 5 due to the axial interference fit formed by the side surface of the pin free end 5 and the side surface of the root portion 10 of the female buckle.
In other embodiments, referring to fig. 2, the sides of the pin free end 5 and the box root 10 are preferably chamfered so that they form an axial interference fit while simultaneously forming a reverse torque shoulder to achieve a negative angle interlock. On the one hand, the elastic deformation of the pin free end 5 is restrained through interference fit between the pin free end 5 and the box root 10, and on the other hand, the pin free end 5 and the box root 10 are interlocked, so that the elastic deformation of the pin free end 5 is restrained, the deformation generated when the necking phenomenon occurs at the pin free end is reduced, the torsion and compression resistance of the pin 1 and the box 2 are improved, and the sealing performance of the expandable threaded connection mechanism is improved.
In an embodiment, referring to fig. 1, the box 2 is further provided with a relief groove 9, and the relief groove 9 is provided between the box thread 4 and the stress groove 7. The tool retracting groove 9 is used for retracting the tool of the thread chaser when processing the thread, and simultaneously stores redundant thread compound after the thread is buckled, so that the negative influence of the thread compound pressure on the sealing performance of the pin 1 and the box 2 is reduced.
In one embodiment, referring to fig. 1, the male buckle front end straight stand 6 is provided with a recess (not shown) corresponding to the protrusion 701, and the recess and the protrusion 701 form an interference fit. The bulge 701 and the concave part are in interference fit, so that the pretightening force of the connection between the male thread screw thread 3 and the female thread screw thread 4 can be increased, meanwhile, by arranging the concave part, the contact area between the bulge 701 and the male thread front end straight table 6 is increased, the acting area of the bulge 701 is increased, the stress can be effectively released by the bulge 701, and meanwhile, the sealing connection effect between the bulge 701 and the male thread front end straight table 6 is better due to the enlarged contact area.
In an embodiment, referring to fig. 1, the protruding portion 701 is an arc-shaped boss, the arc-shaped boss is disposed in the middle of the stress groove 7, and the outer contour of the abutting portion between the arc-shaped boss and the straight boss 6 at the front end of the pin is arc-shaped. When the male buckle 1 and the female buckle 2 are used, when local stress concentration is caused by uneven expansion, the stress groove 7 is formed by cutting the groove at the stress concentration part, a new stress concentration point is formed on the arc-shaped bosses in the stress grooves 7, the original stress which is too concentrated is shared, and the arc-shaped bosses are symmetrically arranged in the middle of the stress groove 7, so that the stress sharing effect is better, the better stress releasing effect is achieved, and the damage and deformation caused by the original stress which is too concentrated can be reduced.
In one embodiment, referring to fig. 1, both the pin thread 3 and the box thread 4 are left-handed threads. The thread that is screwed in when rotated counterclockwise is called left-handed thread. In daily life, when rotating various axle type equipment, user's use habit is anticlockwise rotation usually, consequently, set up pin 1 and box 2 on expandable pipe fitting, when the pin screw thread 3 of expandable pipe fitting and the box screw thread 4 of another expandable pipe fitting are connected, adopt anticlockwise rotation expandable pipe fitting, not only accord with user's use habit, also can make the connection between box screw thread 4 and pin screw thread 3 more firm.
In one embodiment, referring to fig. 1, both pin thread 3 and box thread 4 are buttress threads. The included angle between the bearing surface 101 contacted between the pin thread 3 and the box thread 4 and the vertical surface is 0 degrees, and the bearing surface 101 with a small angle improves the stretching and bending resistance of the pin 1 and the box 2, so that the connection strength of the threaded connection mechanism is improved, wherein the included angle between the guide surface 102 and the vertical surface is 0-45 degrees.
In an embodiment, the sealing member 801 is preferably a sealing ring, and the sealing ring is preferably made of fluororubber or perfluoroether rubber, so that the sealing member is suitable for a severe downhole high-temperature environment and can prevent deformation and failure of the sealing member, thereby ensuring that the expandable threaded connection mechanism still maintains good sealing performance under the severe downhole high-temperature environment. Here, the sealing ring may be made of other materials, so long as it can ensure that it can maintain a high-efficiency sealing effect in a downhole environment.
Example two
Based on the same inventive concept, a second embodiment of the present application provides an expansion pipe including an expansion pipe body and the expandable threaded connection mechanism in the first embodiment. Wherein, the pin and the box are respectively arranged at two ends of the expansion pipe body.
Example III
Based on the same inventive concept, the third embodiment of the application provides an expansion pipe patching process pipe column, which comprises a plurality of expansion pipes of the second embodiment. Because of the limitation of the length of the expansion pipe, the transportation vehicle and the like, the sleeve damage patch (> 10 m) for the long section needs to adopt a plurality of expansion pipes, and each expansion pipe is connected with the female buckle through the male buckle for expansion patch operation. Referring to fig. 1 and 2, when in use, the expansion pipe is expanded under force, the pin free end 5 is contracted and deformed, and separated from the box root 10 to a certain extent, but the length a of the pin free end contracted and deformed is smaller than the distance between the box root 10 and the seal groove 8, so that the seal groove 8 is always in sealing fit with the pin front end straight stand 6. Meanwhile, the stress groove 7 and the bulge part 701 in the stress groove 7 are designed to cope with the situation of local stress concentration, wherein the bulge part 701 forms a new stress concentration point and shares the original stress which is too concentrated, so that the effect of releasing the stress is achieved, the damage and deformation caused by the original stress which is too concentrated can be reduced, the bulge part 701 can retract after expansion and form effective extrusion with the straight platform 6 at the front end of the pin thread, and the sealing capability is effectively improved. Therefore, the sealing connection effect between the expansion pipes is ensured, and the normal operation of the subsequent expansion patch operation is ensured.
Example IV
Based on the same inventive concept, the fourth embodiment of the application provides an expansion pipe patching method, which adopts the expansion pipe patching process pipe column in the third embodiment, and comprises the following steps:
according to the number of preset expansion pipes, each expansion pipe is connected with the female buckle through a male buckle in a threaded manner;
And (3) placing the expansion pipe patch process pipe column into a preset position in the pit, and performing expansion patch construction.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (12)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311479648.7A CN119957739A (en) | 2023-11-08 | 2023-11-08 | An expandable threaded connection mechanism, an expansion pipe, and a patching process pipe column and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311479648.7A CN119957739A (en) | 2023-11-08 | 2023-11-08 | An expandable threaded connection mechanism, an expansion pipe, and a patching process pipe column and method |
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| CN119957739A true CN119957739A (en) | 2025-05-09 |
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| CN202311479648.7A Pending CN119957739A (en) | 2023-11-08 | 2023-11-08 | An expandable threaded connection mechanism, an expansion pipe, and a patching process pipe column and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN120667586A (en) * | 2025-08-22 | 2025-09-19 | 河北上善石油机械有限公司 | High-temperature high-pressure self-balancing airtight threaded connection structure |
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