CN210264568U - High-performance metal self-sealing special threaded joint for shale gas well - Google Patents
High-performance metal self-sealing special threaded joint for shale gas well Download PDFInfo
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- CN210264568U CN210264568U CN201921340693.3U CN201921340693U CN210264568U CN 210264568 U CN210264568 U CN 210264568U CN 201921340693 U CN201921340693 U CN 201921340693U CN 210264568 U CN210264568 U CN 210264568U
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Abstract
The utility model discloses a high-performance metal self-sealing special threaded joint for a shale gas well, which comprises a coupling and a pipe body matched with the coupling, wherein the coupling is provided with an internal thread, a tool withdrawal groove, a coupling internal sealing conical surface, a coupling anti-torque shoulder and a coupling middle hole in sequence along the axis direction; the pipe body is sequentially provided with an external thread, an external thread transition surface, a conical transition surface, an external sealing conical surface of the pipe body, an anti-torque end surface of the pipe body, an internal flat cylindrical surface of a pipe end and an internal flat conical surface of the pipe end along the axis direction; after the coupling and the pipe body are connected through threads, the metal interference contact is carried out on the inner sealing conical surface of the coupling and the outer sealing conical surface of the pipe body, the metal interference contact is carried out on the anti-torque shoulder of the coupling and the anti-torque end surface of the pipe body, the metal interference contact is carried out on the tooth top of the internal thread and the tooth bottom of the external thread, the tooth bottom of the internal thread is separated from the tooth top of the external thread, the internal thread guide surface is separated from the external thread guide surface, the metal contact is carried out on the. The utility model discloses special screwed joint comprehensive properties is excellent.
Description
The technical field is as follows:
the utility model belongs to the technical field of oil casing threaded connection connects for oil exploration and development, concretely relates to shale gas well is with special screwed joint of high performance metal self sealss.
Background art:
in recent years, with the acceleration of the production and consumption speed of natural gas, the development of unconventional natural gas such as shale gas and the like is increased in China, and the conversion from the conventional natural gas to the unconventional natural gas is realized. Shale gas reserves in China are abundant, the exploitation difficulty is large, and the process is complex. The method has the advantages that higher requirements are made on the comprehensive performance of the oil casing, particularly the casing threaded connection joint is required to have excellent compression performance, tensile strength, sealing performance, bending performance, anti-galling performance, high temperature resistance, torque resistance and the like, and common API threads and economical special threads are difficult to meet the use requirements, so that domestic pipe-making enterprises devote themselves to developing high-performance special threaded joint casings suitable for shale gas wells according to the field use requirements.
The utility model has the following contents:
an object of the utility model is to provide a shale gas well is with special screwed joint of high performance metal self sealss, it connects comprehensive properties excellent, possesses high anti compression, high joint strength, high sealed, high bending resistance, high anti-thread gluing and high antitorque square etc. has simple structure, easily processing simultaneously, goes up to detain characteristics such as smooth and easy and location accuracy, can solve shale gas well development requirement threaded connection's reliability and seal structure integrality.
The utility model aims at solving through the following technical scheme: a high-performance metal self-sealing special threaded joint for a shale gas well comprises a coupling and a pipe body matched with the coupling, wherein the coupling is sequentially provided with internal threads, a tool withdrawal groove, a coupling inner sealing conical surface, a coupling anti-torque shoulder and a coupling middle hole along the axis direction; the pipe body is sequentially provided with an external thread, an external thread transition surface, a conical transition surface, an external sealing conical surface of the pipe body, an anti-torque end surface of the pipe body, an internal flat cylindrical surface of a pipe end and an internal flat conical surface of the pipe end along the axis direction; after the coupling and the pipe body are connected through threads, the metal interference contact is carried out on the inner sealing conical surface of the coupling and the outer sealing conical surface of the pipe body, the metal interference contact is carried out on the anti-torque shoulder of the coupling and the anti-torque end surface of the pipe body, the metal interference contact is carried out on the tooth top of the internal thread and the tooth bottom of the external thread, the tooth bottom of the internal thread is separated from the tooth top of the external thread, the internal thread guide surface is separated from the external thread guide surface, the metal contact is carried out on the.
The beneficial effects of the utility model reside in that:
1. the coupling anti-torque shoulder and the pipe body anti-torque end face are both negative angles, the accuracy of the upper buckle positioning is guaranteed, and meanwhile the coupling anti-torque shoulder and the pipe body anti-torque end face are in metal interference contact to achieve an auxiliary sealing effect.
2. The utility model discloses a metal interference seal structure of conical surface/conical surface can guarantee that sealed interference length is in 3-6mm within range, can guarantee simultaneously that sealed interference length within range interference magnitude is 0.2-1mm even, and the sealed interference length of increase can effectively improve the fail safe nature of sealing performance under the combined load such as screwed joint at tensile/compression, crooked, interior pressure/external pressure, impact, and the influence of the sealed face friction each other of big tapering sealed face to sealing performance can be reducible at the last knot in-process simultaneously.
3. The internal thread and the external thread are small-taper conical threads, compared with other large-taper threads, the length of the complete thread can be increased, and meanwhile, the bearing surfaces of the internal thread and the external thread are at negative angles, so that the connection strength of the threads is greatly enhanced.
4. The tooth bottom of the internal thread is separated from the tooth top of the external thread, so that the flow of redundant thread grease in the thread is facilitated, and the internal pressure of the thread grease in the screwing-up process is reduced; the internal thread adopts the combination guide surface to be matched with the external thread guide surface, which is beneficial to increasing the internal clearance of the thread and greatly improving the anti-thread gluing performance, and simultaneously has the characteristics of easy thread leading, convenient field operation and the like.
5. The tool withdrawal groove is formed at the ending part of the internal thread of the coupling, so that a multi-tooth tool machining process is convenient to use, and the machining efficiency is improved; the tool withdrawal groove and the transition surface of the cone form an oil storage groove which has the function of storing redundant thread grease.
Drawings
FIG. 1 is a schematic view of the coupling box and the pipe body pin of the present invention;
FIG. 2 is an enlarged partial schematic view of the sealing engagement;
FIG. 3 is a schematic view of a collar construction;
FIG. 4 is an enlarged partial schematic view of the sealing portion of the collar structure;
FIG. 5 is a schematic view of a tube structure;
FIG. 6 is an enlarged partial view of the sealing portion of the tubular body structure;
FIG. 7 is a female thread profile;
fig. 8 is a male thread profile.
The reference signs indicate that 1-coupling, 2-pipe body, 3-internal thread, 4-tool withdrawal groove, 5-coupling internal sealing conical surface, 6-coupling torque-resistant shoulder, 7-coupling middle hole, 8-external thread, 9-external thread transition surface, 10-conical transition surface, 11-pipe external sealing conical surface, 12-pipe torque-resistant end surface, 13-pipe end internal flat cylindrical surface, 14-pipe end internal flat conical surface, 15-oil storage groove, H-internal thread tooth height, A1-internal thread tooth space, A2-internal thread tooth thickness, gamma 1-first guide surface angle, gamma 2-second guide surface angle, H-second guide surface height, theta 1-internal thread bearing surface negative angle, H1-external thread tooth height, C2-external thread tooth space, C1-external thread tooth thickness, gamma 3-external thread guide surface angle, theta 2-external thread negative angle, L-interference length, delta 1-interference amount, cone angle, β -bearing surface cone angle, β -external thread interference amount,
Negative shoulder angle,
Negative end face angle, α -cone angle.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1 to 6, the high-performance metal self-sealing special threaded joint for the shale gas well comprises a coupling 1 and a pipe body 2 matched with the coupling 1, wherein the coupling is sequentially provided with an internal thread 3, a tool withdrawal groove 4, a coupling internal sealing conical surface 5, a coupling anti-torque shoulder 6 and a coupling middle hole 7 along the axial direction; the pipe body 2 is sequentially provided with an external thread 8, an external thread transition surface 9, a conical transition surface 10, a pipe body external sealing conical surface 11, a pipe body anti-torque end surface 12, a pipe end internal flat cylindrical surface 13 and a pipe end internal flat conical surface 14 along the axial direction; after the coupling 1 and the pipe body 2 are in threaded connection, the coupling inner sealing conical surface 5 is in metal interference contact with the pipe body outer sealing conical surface 11, the coupling anti-torque shoulder 6 is in metal interference contact with the pipe body anti-torque end face 12, the tooth tops of the internal threads 3 are in metal interference contact with the tooth bottoms of the external threads 8, the tooth bottoms of the internal threads 3 are separated from the tooth tops of the external threads 8, the guide surfaces of the internal threads 3 are separated from the guide surfaces of the external threads 8, the bearing surfaces of the internal threads 3 are in metal contact with the bearing surfaces of the external threads 8, and the tool withdrawal.
As shown in fig. 7, the internal thread 3 tooth form of the present invention is a coupling buttress thread, including a tooth top, a tooth bottom, a guide surface, a bearing surface, an internal thread tooth height H, an internal thread tooth space a1, and an internal thread tooth thickness a2, wherein the tooth top and the tooth bottom are parallel to the central axis of the coupling 1; the guide surface is a double-angle combined guide surface, the angle gamma 1 of the first guide surface is 10-13 degrees, the angle gamma 2 of the second guide surface is 30-40 degrees, and the height H of the second guide surface is 1/3-1/2 of the tooth height H of the internal thread; the negative angle theta 1 of the bearing surface of the internal thread is 1-3 degrees; the height H of the internal thread is 1.6mm-1.85 mm; the difference between the tooth space A1 of the internal thread and the tooth thickness A2 of the internal thread is 0.1mm-0.2 mm.
As shown in fig. 8, the external thread 8 tooth form of the present invention is a trapezoid, and includes a tooth top, a tooth bottom, a guiding surface, a carrying surface, an external thread tooth height H1, an external thread tooth space C2, and an external thread tooth thickness C1, wherein the tooth top and the tooth bottom are parallel to the central axis of the tube body 2; the angle gamma 3 of the external thread guide surface is 10-13 degrees; the negative angle theta 2 of the bearing surface of the external thread is 1-3 degrees; the height H1 of the external thread is 1.5mm-1.75 mm; the difference between the external thread tooth space C2 and the external thread tooth thickness C1 is 0.05-0.15 mm. The internal thread and the external thread of the utility model both adopt the taper thread with small taper, the taper is 1:18, 5 teeth per inch, the surface of the internal thread is processed by phosphorization or copper plating, and the anti-thread gluing performance of the thread and the sealing surface can be improved. Before the threaded connection, the internal thread and the external thread are coated with thread grease, so that the thread gluing resistance and the sealing performance of the thread surface can be further improved; after threaded connection, metal interference contact range is 0.05mm-0.2mm at the bottom of 3 addendums of internal thread and the 8 tooth of external screw thread, and at the bottom of the 3 tooth of internal thread and the 8 addendums of external screw thread alternate segregation, interior, external screw thread spigot surface alternate segregation, interior, external screw thread tooth type intermeshing forms the utility model discloses a first way is sealed.
As shown in fig. 1 and 2, the inner sealing conical surface 5 of the coupling and the outer sealing conical surface 11 of the pipe body are both large-taper conical surfaces, the taper ranges from 1:2.5 to 1:2, the length of the inner sealing conical surface 5 of the coupling ranges from 6mm to 12mm, and the length of the outer sealing conical surface 11 of the pipe body ranges from 3mm to 6 mm; after the internal thread 3 is in threaded connection with the external thread 8, the inner sealing conical surface 5 of the coupling is in metal interference contact with the outer sealing conical surface 11 of the pipe body, the interference length L ranges from 3mm to 6mm, and the interference magnitude delta 1 ranges from 0.2mm to 1 mm. The utility model discloses screwed joint has adopted the metal interference seal structure of big tapering conical surface/conical surface, threaded connection back, can guarantee the contact pressure evenly distributed of sealed contact length and sealed contact length within range simultaneously, the sealed interference length L of increase is 3mm-6mm, can reduce to connect under the compound load effect such as tensile/compression, crooked, interior pressure/external pressure, impact to the influence of joint sealing performance, big tapering sealing surface can reduce at the last in-process of detaining simultaneously, the influence of external sealing surface looks mutual friction to sealing performance. The mutual interference contact of the inner sealing conical surface and the outer sealing conical surface of the joint forms the utility model discloses a second way is sealed, also is the main seal of the joint structure.
Referring to fig. 1 to 6, the length of the tool withdrawal groove 4 of the coupling 1 of the invention is 5.08mm-10.16mm, the depth is 1mm-2mm, and the tool withdrawal groove 4 can be processed by a multi-tooth cutter thread, so as to improve the processing efficiency, and after the tool withdrawal groove is buckled, the tool withdrawal groove 4 is matched with the conical transition surface 10 to form an oil storage tank, so that the oil storage tank has the function of storing redundant thread grease, the taper range of the conical transition surface 10 of the pipe body 2 is 1:18-1:20, the taper angle β range of the external thread transition surface 9 is 60-65 degrees, so that the external thread processing interference.
Referring to FIGS. 1-6, the torque-resisting shoulder 6 of the coupling and the torque-resisting end surface 12 of the pipe body are negative angles, and the negative angle of the shoulder
Negative angle with end face
The degrees are the same, the range is 13-15 degrees, the structure can ensure the position precision of the upper buckle and the anti-compression performance of the joint, simultaneously, the metal interference contact between the coupling anti-torque shoulder 6 and the pipe anti-torque end face 12 after the upper buckle can play a role of auxiliary sealing, the third sealing is realized, the pipe anti-torque end face 12 and the pipe external sealing conical surface 11 adopt the arc transition, the arc radius is 1mm-1.5mm, the pipe external sealing conical surface 11 and the cone transition surface 9 adopt the arc transition, the coupling anti-torque shoulder 6 and the coupling internal sealing conical surface 5 adopt the arc transition, the fillet radius is 0.6mm-1mm, the coupling internal sealing conical surface 5 and the tool withdrawal groove 4 adopt the arc transition, the length of the cylindrical surface 13 in the pipe end 2 is 3mm-6mm, and the conical surface 14 in the pipe end has the cone angle α of 5-10 degrees.
Claims (7)
1. The utility model provides a shale gas is special screwed joint of high performance metal self sealss for well which characterized in that: the coupling comprises a coupling (1) and a pipe body (2) matched with the coupling (1), wherein the coupling is sequentially provided with an internal thread (3), a tool withdrawal groove (4), a coupling inner sealing conical surface (5), a coupling anti-torque shoulder (6) and a coupling middle hole (7) along the axis direction; the pipe body (2) is sequentially provided with an external thread (8), an external thread transition surface (9), a conical transition surface (10), a pipe body external sealing conical surface (11), a pipe body anti-torque end surface (12), a pipe end internal flat cylindrical surface (13) and a pipe end internal flat conical surface (14) along the axial direction; coupling (1) and body (2) threaded connection back, coupling inner seal conical surface (5) and body outer seal conical surface (11) metal interference contact, coupling antitorque square circular bead (6) and body antitorque square terminal surface (12) metal interference contact, internal thread (3) tooth top and external screw thread (8) tooth bottom metal interference contact, internal thread (3) tooth bottom and external screw thread (8) tooth top separation, internal thread (3) spigot surface and external screw thread (8) spigot surface separation, internal thread (3) loading surface and external screw thread (8) loading surface metal contact, tool withdrawal groove (4) and the excessive face of circular cone (10) form oil storage tank (15).
2. The high-performance metal self-sealing special threaded joint for the shale gas well according to claim 1, is characterized in that: the thread form of the internal thread (3) is a coupling buttress thread and comprises a tooth top, a tooth bottom, a guide surface, a bearing surface, an internal thread tooth height (H), an internal thread tooth socket (A1) and an internal thread tooth thickness (A2), wherein the tooth top and the tooth bottom are parallel to the central axis of the coupling (1); the guide surface is a double-angle combined guide surface, the angle (gamma 1) of the first guide surface is 10-13 degrees, the angle (gamma 2) of the second guide surface is 30-40 degrees, and the height (H) of the second guide surface is 1/3-1/2 of the height (H) of the internal thread; the negative angle (theta 1) of the bearing surface of the internal thread is 1-3 degrees; the height (H) of the internal thread is 1.6mm-1.85 mm; the difference between the tooth depth (A2) of the internal thread tooth socket (A1) and the internal thread tooth depth (A2) is 0.1mm-0.2 mm.
3. The high-performance metal self-sealing special threaded joint for the shale gas well according to claim 1, is characterized in that: the tooth shape of the external thread (8) is buttress, and comprises a tooth top, a tooth bottom, a guide surface, a bearing surface, an external thread tooth height (H1), an external thread tooth groove (C2) and an external thread tooth thickness (C1), wherein the tooth top and the tooth bottom are parallel to the central axis of the pipe body (2); the angle (gamma 3) of the external thread guide surface is 10-13 degrees; the negative angle (theta 2) of the bearing surface of the external thread is 1-3 degrees; the height (H1) of the external thread is 1.5mm-1.75 mm; the difference between the tooth depth (C1) of the external thread tooth space (C2) and the tooth depth (C1) of the external thread is 0.05-0.15 mm.
4. The high-performance metal self-sealing special threaded joint for the shale gas well according to claim 1, is characterized in that: the internal thread (3) and the external thread (8) are both small taper conical threads, the taper is 1:18, and 5 teeth per inch; after the screw connection, the interference contact range of the tooth top of the internal thread (3) and the tooth bottom metal of the external thread (8) is 0.05mm-0.2 mm.
5. The high-performance metal self-sealing special threaded joint for the shale gas well according to claim 1, is characterized in that: the inner sealing conical surface (5) of the coupling and the outer sealing conical surface (11) of the pipe body are both large-taper conical surfaces, the taper ranges from 1:2.5 to 1:2, the length of the inner sealing conical surface (5) of the coupling ranges from 6mm to 12mm, and the length of the outer sealing conical surface (11) of the pipe body ranges from 3mm to 6 mm; after the internal thread (3) is in threaded connection with the external thread (8), the inner sealing conical surface (5) of the coupling is in metal interference contact with the outer sealing conical surface (11) of the pipe body, the interference length (L) ranges from 3mm to 6mm, and the interference magnitude (delta 1) ranges from 0.2mm to 1 mm.
6. The high-performance metal self-sealing special threaded joint for the shale gas well is characterized in that the length of the tool withdrawal groove (4) of the coupling (1) is 5.08mm-10.16mm, the depth of the tool withdrawal groove is 1mm-2mm, the taper range of the conical transition surface (10) of the pipe body (2) is 1:18-1:20, and the taper angle (β) of the external thread transition surface (9) ranges from 60 degrees to 65 degrees.
7. The high-performance metal self-sealing special threaded joint for the shale gas well according to claim 1, is characterized in that: the torque-resistant shoulder (6) of the coupling and the torque-resistant end surface (12) of the pipe body are negative angles, and the negative angle of the shoulder
Negative angle with end face
The degrees are the same and range from 13 degrees to 15 degrees, the torque-resistant end face (12) of the pipe body and the outer sealing conical surface (11) of the pipe body are in arc transition, the arc radius is 1mm-1.5mm, the outer sealing conical surface (11) of the pipe body and the conical transition surface (10) are in arc transition, the coupling torque-resistant shoulder (6) and the inner sealing conical surface (5) of the coupling are in arc transition, the arc radius is 0.6mm-1mm, the inner sealing conical surface (5) of the coupling and the tool withdrawal groove (4) are in arc transition, the length of the inner flat cylindrical surface (13) of the pipe end of the pipe body (2) is 3mm-6mm, and the conical taper angle (α) of the inner flat conical surface (14) of the pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921340693.3U CN210264568U (en) | 2019-08-19 | 2019-08-19 | High-performance metal self-sealing special threaded joint for shale gas well |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921340693.3U CN210264568U (en) | 2019-08-19 | 2019-08-19 | High-performance metal self-sealing special threaded joint for shale gas well |
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| CN210264568U true CN210264568U (en) | 2020-04-07 |
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| CN201921340693.3U Active CN210264568U (en) | 2019-08-19 | 2019-08-19 | High-performance metal self-sealing special threaded joint for shale gas well |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110318689A (en) * | 2019-08-19 | 2019-10-11 | 中国石油天然气集团有限公司 | A kind of shale gas well high-performance metal self-sealing Special threading connector |
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2019
- 2019-08-19 CN CN201921340693.3U patent/CN210264568U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110318689A (en) * | 2019-08-19 | 2019-10-11 | 中国石油天然气集团有限公司 | A kind of shale gas well high-performance metal self-sealing Special threading connector |
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