CN116927676A - High anti moment of torsion of oil casing, high metal self sealss screwed joint structure - Google Patents
High anti moment of torsion of oil casing, high metal self sealss screwed joint structure Download PDFInfo
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- CN116927676A CN116927676A CN202210325888.0A CN202210325888A CN116927676A CN 116927676 A CN116927676 A CN 116927676A CN 202210325888 A CN202210325888 A CN 202210325888A CN 116927676 A CN116927676 A CN 116927676A
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- 239000002184 metal Substances 0.000 title claims abstract description 47
- 241000283216 Phocidae Species 0.000 title claims description 5
- 238000007789 sealing Methods 0.000 claims abstract description 100
- 238000010168 coupling process Methods 0.000 claims abstract description 48
- 238000005859 coupling reaction Methods 0.000 claims abstract description 48
- 230000008878 coupling Effects 0.000 claims abstract description 45
- 239000011295 pitch Substances 0.000 claims description 51
- 230000007704 transition Effects 0.000 claims description 12
- 108700041286 delta Proteins 0.000 claims description 5
- 230000006835 compression Effects 0.000 abstract description 7
- 238000007906 compression Methods 0.000 abstract description 7
- 239000003208 petroleum Substances 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 22
- 238000012545 processing Methods 0.000 description 7
- 235000000621 Bidens tripartita Nutrition 0.000 description 4
- 240000004082 Bidens tripartita Species 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 208000006637 fused teeth Diseases 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000004026 adhesive bonding Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000003209 petroleum derivative Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/08—Casing joints
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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
- F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
- F16L15/001—Screw-threaded joints; Forms of screw-threads for such joints with conical threads
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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
- F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
- F16L15/04—Screw-threaded joints; Forms of screw-threads for such joints with additional sealings
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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
- F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
- F16L15/06—Screw-threaded joints; Forms of screw-threads for such joints characterised by the shape of the screw-thread
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
The utility model belongs to the technical field of petroleum exploitation pipes, and particularly relates to a high-torque-resistance and high-metal self-sealing threaded joint structure of an oil sleeve, which comprises a coupling and a pipe body, wherein an internal thread, a tool withdrawal groove, a coupling sealing conical surface and an anti-torque shoulder are sequentially arranged on the inner side of the coupling along the axis direction, an external thread, a transitional conical surface and a pipe sealing conical surface are sequentially arranged on the outer side of the pipe body along the axis direction, a pipe anti-torque end face is arranged at the end part of the pipe body, a pipe end inner flat conical surface and a pipe end inner flat conical surface are arranged on the inner side of the pipe body, after the coupling is in threaded connection with the pipe body, the coupling sealing conical surface is in metal interference contact with the pipe sealing conical surface, the anti-torque shoulder is in metal interference contact with the pipe body anti-torque end face, the inner thread crest is in metal interference contact with the outer thread root, and the inner thread root is separated from the outer thread crest. The threaded joint structure has the performances of high connection strength, high air tightness, high compression resistance and the like, and simultaneously has the capacities of resisting large buckling torque and large rotation torque.
Description
Technical Field
The utility model belongs to the technical field of petroleum exploitation pipes, and particularly relates to a high-torque-resistance high-metal self-sealing threaded joint structure of an oil casing.
Background
The oil casing is a special petroleum pipe material necessary for exploiting petroleum and natural gas, and hundreds of oil casings or even hundreds of oil casings are connected through threads and extend from the ground to a place of thousands of meters underground to form a passage for petroleum and natural gas. The threaded connection of the oil sleeve is the weakest link, a plurality of failures occur at the threaded connection position, after the oil sleeve joint fails, a great accident can be caused, great economic loss is brought, and the environment is polluted and casualties are caused. At present, in order to solve the failure problem of the threaded connection part, oil fields and oil casing production factories all make great efforts, and a plurality of feasible measures are adopted, but with the progress of drilling technology, the exploitation depth is deeper and deeper, the downhole temperature and pressure are higher and higher, the current technology still cannot completely meet the severe requirements of the site, and new technologies and new connection forms are continuously presented.
With the rapid development of the petroleum industry in China, the development quantity of oil and gas wells under severe working conditions such as deep wells, ultra-deep wells, long horizontal wells, high-pressure wells and the like is increased year by year in recent years, and the drilling and production process difficulty is also increased. In these special well drilling processes, special processes such as high-torque rotation, lifting and lowering are often required. This requires oil casings having both high connection strength, high gas tightness, and high compression resistance, as well as resistance to large make-up and rotation torques. However, conventional API joints and conventional special threaded joints cannot simultaneously have the above properties.
Chinese patent grant number CN 207363612U, grant date 2018, 5 month 15, entitled "gas tight threaded joint for petroleum casing", which improves API threads. The joint consists of a coupling and a pipe, and is connected by adopting taper pipe threads. An internal thread, a cylindrical hole, a sealing internal conical surface and a torque shoulder are sequentially arranged on the coupling; the end of the pipe is sequentially provided with an external thread, a cylindrical surface, a transitional conical surface, a sealing external conical surface and an end shoulder. The internal thread and the external thread are meshed with each other, so that sufficient connection strength is provided for the joint; the inner sealing conical surface and the outer sealing conical surface form radial interference fit to prevent high-pressure gas leakage; the torque shoulder on the coupling and the end shoulder on the pipe are mutually propped up tightly to form axial interference fit, so that the sealing effect of the joint is further enhanced, the buckling torque is shared, and the anti-torsion capability of the joint is improved. The defects are that: 1) The distance between the sealing conical surface and the torque shoulder is too short, and the contact stress on the sealing conical surface can be seriously influenced when the torque shoulder is overtorque, so that the sealing conical surface is in premature failure; 2) The sealing conical surface is just at the pipe tip, lifts by crane oil pipe and sleeve pipe and carries out the operation of buckling, and the sealing conical surface is very easy to damage.
Disclosure of Invention
Aiming at the problems, the utility model aims to provide a high-torque-resistance and high-metal self-sealing threaded joint structure of an oil casing, which solves the problem that an API joint and a common special threaded joint cannot simultaneously have large-buckling-torque resistance and large-rotation-torque resistance.
The technical scheme of the utility model is as follows: the utility model provides a high anti moment of torsion of oil casing, high metal self sealss screwed joint structure, includes the coupling, with coupling matched with body, the coupling inboard is equipped with internal thread, tool withdrawal groove, coupling sealing cone, antitorque round shoulder in proper order along the axis direction, the body outside is equipped with external thread, transitional cone, body sealing cone in proper order along the axis direction, the tip of body is equipped with body antitorque round terminal surface, the body inboard is equipped with pipe end internal flat, pipe end internal flat cone in proper order along the axis direction, internal thread, external thread are buttress thread, the internal thread is the equal pitch, the external thread is the variable pitch, the external thread includes complete screw thread part, incomplete screw thread part, coupling and body threaded connection back, antitorque round cone with body sealing cone metal interference contact, coupling sealing cone is 5~ 15 with body axis contained angle gamma scope, antitorque round shoulder and body antitorque round terminal surface metal interference contact, internal thread crest and external thread root metal interference separation.
The coupling sealing conical surface is parallel to the pipe body sealing conical surface, the anti-torque shoulder is parallel to the pipe body anti-torque end surface, and the included angle alpha between the pipe body anti-torque end surface and the pipe body sealing conical surface is 80-90 degrees.
The included angle beta between the transition conical surface and the central axis of the tube body ranges from 4 degrees to 15 degrees, and the included angle theta between the inner conical surface of the tube end and the central axis of the tube body ranges from 4 degrees to 15 degrees.
The interference delta 1 between the thread crests and the thread bottoms of the buttress threads of the internal thread and the buttress threads is 0.12 mm-0.16 mm, and the flank clearance delta 2 is 0-0.4 mm.
The pitch of the external thread complete thread part is larger than that of the internal thread, and the difference value between the maximum pitch P2 of the external thread complete thread part and the pitch P of the internal thread is 0.05-0.2 mm.
The pitch of the incomplete thread part of the external thread is smaller than that of the internal thread, and the difference value between the minimum pitch P1 of the incomplete thread part of the external thread and the pitch P of the internal thread is-0.4 to-0.05 mm.
The length L of the sealing conical surface of the pipe body is 5-8 mm.
The length D of the transition conical surface lower than the first tooth thread root of the end part of the pipe body is 4-10 mm, and the inner flat length I of the pipe end is 5-8 mm.
The utility model has the technical effects that: 1. according to the utility model, by adopting a metal interference self-sealing mode of the small-angle coupling sealing conical surface and the pipe body sealing conical surface, the sealing interference is more uniformly distributed along the whole sealing surface in the buckling process, thereby being beneficial to preventing friction damage of the sealing surface and slowing down stress corrosion of the sealing surface position in the buckling process, and having good sealing effect; 2. according to the utility model, through setting the included angles between the transition conical surface and the inner conical surface of the pipe end and the central axis of the pipe body, the nose end of the pipe body is tilted towards the outer direction of the pipe diameter, so that the stress direction of the pipe end is changed in the process of high-torque screwing-in, the compression deformation and stress concentration conditions of a coupling torque shoulder are improved, and the influence of micro deformation of the torque-resistant shoulder on the sealing performance of the joint in the process of high-torque screwing-in can be effectively relieved; 3. according to the utility model, the included angle between the anti-torque end face of the pipe body and the sealing conical surface of the pipe body is set, so that the pipe end can be restrained from deforming towards the inner diameter direction, the necking deformation of the pipe end during high-torque screwing-up is prevented, and the joint structure is ensured to have high self-sealing performance while screwing-up at high torque; 4. according to the utility model, the workability of the joint structure is fully considered by designing the entering position of the pipe body thread cutter and the coupling thread cutter withdrawal groove, so that the processing of the double-tooth cutter and the multi-tooth cutter of the joint thread is facilitated, and the processing efficiency is improved; 5. according to the utility model, by adopting the design of variable pitch of the external thread and fixed pitch of the internal thread, wherein the pitch of the complete thread part of the external thread is larger than that of the internal thread, and the pitch of the incomplete thread part of the external thread is smaller than that of the internal thread, the problem of thread gluing of the incomplete thread part of the pipe body during the assembly/disassembly can be avoided while the large torque resistance of the thread part is ensured, and the large torque resistance of the whole joint structure is further improved.
Further description will be made below with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic diagram of a high-torque-resistance high-metal self-sealing threaded joint of an oil casing according to an embodiment of the present utility model.
Fig. 2 is a schematic diagram of a coupling structure of a high-torque-resistance high-metal self-sealing threaded joint structure of an oil casing according to an embodiment of the present utility model.
Fig. 3 is a schematic diagram of a pipe body structure of a high-torque-resistance high-metal self-sealing threaded joint structure of an oil casing according to an embodiment of the present utility model.
Fig. 4 is a schematic diagram showing a partially enlarged seal portion of a high torque resistant, high metal self-sealing threaded joint structure for an oil casing according to an embodiment of the present utility model.
Fig. 5 is an enlarged schematic view of an internal and external thread structure of a high torque resistant, high metal self-sealing threaded joint structure for an oil casing according to an embodiment of the present utility model.
Fig. 6 is an enlarged partial schematic view of the internal thread portion of a coupling of a high torque resistance, high metal self-sealing threaded joint configuration for an oil casing according to an embodiment of the present utility model.
Fig. 7 is an enlarged partial schematic view of an incomplete thread portion of an external thread of a tubular body of a high torque resistance, high metal self-sealing threaded joint structure of an embodiment of the present utility model.
Fig. 8 is an enlarged partial schematic view of a complete thread portion of an external thread of a tubular body of a high torque resistance, high metal self-sealing threaded joint construction for an oil casing according to an embodiment of the present utility model.
Reference numerals: the pipe comprises a 1-coupling, a 2-pipe body, a 3-internal thread, a 4-tool withdrawal groove, a 5-coupling sealing conical surface, a 6-torque-resistant shoulder, a 7-external thread, an 8-transition conical surface, a 9-pipe body sealing conical surface, a 10-pipe body torque-resistant end surface, an 11-pipe end internal flat, a 12-pipe end internal conical surface, a D-transition conical surface which is lower than the length of a first thread root of the pipe body thread, an L-pipe sealing conical surface length, an I-pipe end internal flat length, an angle between an alpha-pipe body torque-resistant end surface and a pipe body sealing conical surface, an angle between a gamma-coupling sealing conical surface and a pipe body central axis, delta 1-internal and external thread crest interference (thread crest-root interference), a theta-pipe end internal conical surface and a pipe body central axis angle, delta 2-internal and external thread tooth width interference (tooth flank gap), a P-internal thread pitch, a P1-pipe incomplete thread minimum pitch and a P2-pipe complete thread maximum pitch.
Detailed Description
Example 1
As shown in fig. 1-4, the high anti-torque and high-metal self-sealing threaded joint structure of the oil sleeve comprises a coupling 1 and a pipe body 2 matched with the coupling 1, wherein an internal thread 3, a tool withdrawal groove 4, a coupling sealing conical surface 5 and an anti-torque shoulder 6 are sequentially arranged on the inner side of the coupling 1 along the axis direction, an external thread 7, a transition conical surface 8 and a pipe sealing conical surface 9 are sequentially arranged on the outer side of the pipe body 2 along the axis direction, a pipe body anti-torque end face 10 is arranged at the end part of the pipe body 2, a pipe end internal flat 11 and a pipe end internal flat conical surface 12 are sequentially arranged on the inner side of the pipe body 2 along the axis direction, the internal thread 3 and the external thread 7 are buttress threads, the internal thread 3 is of equal pitch, the external thread 7 is of variable pitch, the external thread 7 comprises a complete thread part and an incomplete thread part, the coupling 1 and the pipe body 2 are in threaded connection, the sealing conical surface 5 is in metal interference contact with the pipe body sealing conical surface 9, the sealing conical surface 5 is in interference contact with the pipe body 2, the range of an included angle gamma of 5 DEG and the interference range of 15 DEG between the metal coupling 6 and the metal top surface 7 and the external thread bottom surface 3 are in contact with the external thread 3.
In the actual use process, the metal interference self-sealing mode of the small-angle coupling sealing conical surface 5+ pipe body sealing conical surface 9 is adopted, so that the sealing interference is more uniformly distributed along the whole sealing surface in the screwing process, the friction damage of the sealing surface in the screwing process is prevented, the stress corrosion of the sealing surface position is slowed down, the large torque resistance of the threaded part can be ensured, the screwing/unscrewing sticking problem of the incomplete threaded part of the pipe body is avoided, and the large torque resistance of the whole joint structure is further improved.
Example 2
Preferably, in this embodiment, based on embodiment 1, the collar sealing conical surface 5 is preferably parallel to the pipe body sealing conical surface 9, the anti-torque shoulder 6 is parallel to the pipe body anti-torque end surface 10, and an included angle α between the pipe body anti-torque end surface 10 and the pipe body sealing conical surface 9 is in a range of 80 ° to 90 °.
In the actual use process, the included angle between the inner conical surface 12 of the pipe end and the central axis of the pipe body 2 is in the range of 4-15 degrees, so that the nose end of the pipe body is tilted in the external pipe diameter direction, the stress direction of the pipe end is changed in the large-torque screwing-up process, the compression deformation and stress concentration condition of a coupling torque shoulder are improved, the influence of micro deformation of the torque-resistant shoulder on the sealing performance of the joint in the large-torque screwing-up process can be effectively relieved, the included angle alpha between the anti-torque end surface 10 of the pipe body and the sealing conical surface 9 of the pipe body is in the range of 80-90 degrees, the pipe end can be restrained from deforming in the internal diameter direction, the shrinkage deformation of the pipe end during large-torque screwing-up is prevented, and the joint structure is ensured to have high self-sealing performance while screwing up in the large-torque.
Example 3
Preferably, in this embodiment, based on embodiment 1 or 2, the angle between the transition conical surface 8 and the central axis of the tube body 2 is in the range of β to 4 ° to 15 °, and the angle between the inner conical surface 12 of the tube end and the central axis of the tube body 2 is in the range of θ to 4 ° to 15 °.
In the actual use process, the pipe end is provided with the transition conical surface 8 and the pipe end inner conical surface 12, so that the whole pipe nose end part position is tilted towards the pipe diameter outer direction, the stress direction of the pipe end is changed in the high-torque screwing-up process, the compression deformation and stress concentration condition of the coupling torque-resistant shoulder 6 are effectively improved, and the weakening effect of the micro deformation of the torque-resistant shoulder 6 on the joint sealing performance in the high-torque screwing-up process can be effectively relieved. The included angle between the transition conical surface 8 and the central axis is beta, the included angle between the pipe end inner conical surface 12 and the central axis is theta, the range of beta and theta is 4-15 degrees, the numerical values of beta and theta are determined according to the torque resistance requirement, and the higher the torque resistance requirement is, the larger the beta and theta angles are.
Example 4
Preferably, in this embodiment, as shown in fig. 6, on the basis of embodiment 1, 2 or 3, the pitch P of the internal thread 3 is 3.81-6.35 mm.
In the actual use process, the pitch P of the internal thread 3 is 3.81-6.35 mm, the pitch change range of the internal thread 3 is large, and the processing of the internal threads of the casings with different sizes is facilitated.
Example 5
Preferably, in this embodiment, as shown in fig. 5, in the present embodiment, the interference delta 1 between the crests and the roots of the buttress threads of the internal thread 3 and the external thread 7 is 0.12mm to 0.16mm, and the flank clearance delta 2 is 0 to 0.4mm.
In the actual use process, the interference delta 1 between the thread crests and the thread bottoms of the buttress threads of the internal threads 3 and the external threads 7 is 0.12-0.16 mm, the flank clearance delta 2 is 0-0.4 mm, so that the problem of thread gluing of the upper/lower shackle of the incomplete thread part of the pipe body can be avoided while the large torque resistance of the thread part is ensured, and the large torque resistance of the whole joint structure is further improved.
Example 6
Preferably, in the present embodiment, as shown in fig. 7 and 8, the pitch of the complete thread part of the external thread 7 is greater than the pitch of the internal thread 3, and the difference between the maximum pitch P2 of the complete thread part of the external thread 7 and the pitch P of the internal thread 3 is 0.05-0.2 mm, based on embodiment 1, 2, 3, 4 or 5; the pitch of the incomplete thread part of the external thread 7 is smaller than that of the internal thread 3, and the difference value between the minimum pitch P1 of the incomplete thread part of the external thread 7 and the pitch P of the internal thread 3 is-0.4 to-0.05 mm.
In the actual use process, the utility model can avoid the problem of thread gluing of the upper/lower thread of the incomplete thread part of the pipe body while ensuring the high torque resistance of the thread part by adopting the structural design that the thread pitches of the complete thread part and the incomplete thread part of the variable-pitch external thread 7 are different from the thread pitch of the internal thread 3, and further improve the high torque resistance of the whole joint structure.
Example 7
Preferably, in this embodiment, as shown in fig. 4, the length L of the sealing conical surface 9 of the tube body is 5-8 mm on the basis of embodiment 1 or 2 or 3 or 4 or 5 or 6.
In the actual use process, the length L of the pipe body sealing conical surface 9 is 5-8 mm, the coupling sealing conical surface 5 is parallel to the pipe body sealing conical surface 9, and the metal sealing effect is ensured.
Example 8
Preferably, in this embodiment, as shown in fig. 4, the length D of the transition conical surface 8 lower than the root of the first thread at the end of the pipe body is 4-10 mm, and the length I of the flat 11 inside the pipe end is 5-8 mm, based on embodiment 1 or 2 or 3 or 4 or 5 or 6 or 7.
In the practical use process, the pipe end transition conical surface 8 of the pipe body is lower than the length D of the first tooth thread root of the pipe body end part by 4-10 mm, so that the double-tooth thread cutter is convenient to process, and compared with single-tooth cutter processing, the double-tooth cutter processing can effectively improve the thread processing efficiency while reducing cutter abrasion. The length I of the inner flat 11 of the pipe end is 5-8 mm, so that the stress of the sealing conical surface of the pipe body is uniform, and the thickness of the anti-torque end face of the pipe body is ensured to be in a reasonable range.
Example 9
The oil casing pipe with high torque resistance and high metal self-sealing threaded joint structure adopts the oil casing pipe with steel grade P110 as an example, and comprises a coupling 1 and a pipe body 2, wherein the specific parameters are as follows:
the coupling sealing conical surface 5 is parallel to the pipe body sealing conical surface 9, the included angle gamma between the coupling sealing conical surface 5 and the axis is 7 degrees, and the length L of the pipe body sealing conical surface 9 is 6mm; the coupling torque-resistant shoulder 6 is parallel to the pipe body torque-resistant end face 10, and the included angle alpha between the pipe body torque-resistant end face 10 and the pipe body sealing conical surface 9 is 85 degrees; the included angle beta between the transitional conical surface 8 and the central axis is 5 degrees, and the included angle theta between the pipe end inner conical surface 12 and the central axis is 8 degrees. The design ensures that the whole nose end part of the pipe body is tilted outwards in the pipe diameter direction, so that the stress direction of the pipe end is changed in the process of high-torque screwing-up, and the torque performance is effectively improved. The length D of the pipe end transition conical surface 8 of the pipe body, which is lower than the first tooth thread root of the pipe end, is 6.5mm, so that the processing is facilitated by adopting a double-tooth thread cutter. The length I of the inner flat 11 of the pipe end is 5mm, so that the sealing conical surface of the pipe body is uniformly stressed. The inner thread of the coupling has equal pitch, the outer thread of the pipe body has variable pitch, the thread top-root interference and the thread side clearance; wherein, the pitch P of the internal thread of the coupling is 5.08mm; the external thread of the pipe body internally changes the pitch, and the reference pitch is consistent with the internal thread; the screw pitch of the external screw thread of the pipe body gradually decreases from outside to inside along the axial direction, the screw pitch of the complete screw thread part of the external screw thread of the pipe body is larger than the screw pitch of the internal screw thread, and the difference between the maximum screw pitch P2 of the complete screw thread part of the external screw thread and the screw pitch P of the internal screw thread is 0.1mm; the screw pitch of the incomplete thread part of the external thread of the pipe is smaller than that of the internal thread, and the difference value between the minimum screw pitch P1 of the incomplete thread part of the external thread of the pipe and the screw pitch P of the internal thread of the coupling is-0.2 mm; the internal thread structure and the external thread structure are buttress threads, the interference delta 1 of the thread crest and the thread root is 0.15mm, and the flank clearance delta 2 is 0.2mm.
Through testing, the yield strength of the processed high-resistance torque and high-metal self-sealing threaded joint body is more than or equal to 758MPa, the tensile strength is more than or equal to 862MPa, the buckling torque of the high-resistance torque and high-metal self-sealing threaded joint structure is up to 18000 N.m, which is higher than the buckling torque of a conventional special buckle, the buckling torque of the conventional special buckle is 13000N.m, the internal pressure/external pressure resistance, the compression/tensile resistance performance of the pipe body are 100%, and the like, and the thread structure is complete and the tightness is perfect when the VME equivalent yield strength of the pipe body is up to 95% under the composite load working conditions of stretching/compression, internal pressure/external pressure resistance, temperature less than or equal to 180 ℃, bending dog leg degree less than 20 degrees/30 m, and the like.
The present utility model is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present utility model are intended to be included in the scope of the present utility model.
Claims (8)
1. The utility model provides a high anti moment of torsion of oil casing, high metal self sealss screwed joint structure which characterized in that: the anti-torque coupling comprises a coupling (1) and a pipe body (2) matched with the coupling (1), wherein an internal thread (3), a tool withdrawal groove (4), a coupling sealing conical surface (5) and an anti-torque shoulder (6) are sequentially arranged on the inner side of the coupling (1) along the axis direction, an external thread (7), a transition conical surface (8) and a pipe sealing conical surface (9) are sequentially arranged on the outer side of the pipe body (2) along the axis direction, a pipe end internal flat (11) and a pipe end internal flat conical surface (12) are sequentially arranged on the inner side of the pipe body (2) along the axis direction, the internal thread (3) and the external thread (7) are buttress threads, the internal thread (3) has equal screw pitches, the external thread (7) has variable screw pitches, the external thread (7) comprises a complete thread part and an incomplete thread part, after the coupling (1) and the pipe body (2) are in threaded connection, the sealing conical surface (5) is in metal interference contact with the pipe sealing conical surface (9), the interference sealing conical surface (5) is in metal interference contact with the pipe end surface (5) and the metal interference torque shoulder (5) is in contact with the metal torque shoulder (5) of the external thread (5) at the metal torque shoulder (3) and the metal torque shoulder (5) at the metal torque shoulder (5) and the metal torque coupling (5) is in contact with the metal torque shoulder (5), the root of the internal thread (3) is separated from the crest of the external thread (7).
2. The oil casing high torque resistance, high metal self-sealing threaded joint structure according to claim 1, wherein: the coupling sealing conical surface (5) is parallel to the pipe body sealing conical surface (9), the torque-resistant shoulder (6) is parallel to the pipe body torque-resistant end surface (10), and an included angle alpha between the pipe body torque-resistant end surface (10) and the pipe body sealing conical surface (9) is 80-90 degrees.
3. The oil casing high torque resistance, high metal self-sealing threaded joint structure according to claim 1, wherein: the included angle between the transitional conical surface (8) and the central axis of the pipe body (2) is within the range of beta and 4-15 degrees, and the included angle between the pipe end inner conical surface (12) and the central axis of the pipe body (2) is within the range of theta and 4-15 degrees.
4. The oil casing high torque resistance, high metal self-sealing threaded joint structure according to claim 1, wherein: the interference delta 1 between the thread crests and the thread bottoms of the buttress threads of the internal thread (3) and the external thread (7) is 0.12 mm-0.16 mm, and the flank clearance delta 2 is 0-0.4 mm.
5. The oil casing high torque resistance, high metal self-sealing threaded joint structure according to claim 1, wherein: the pitch of the whole thread part of the external thread (7) is larger than that of the internal thread (3), and the difference value between the maximum pitch P2 of the whole thread part of the external thread (7) and the pitch P of the internal thread (3) is 0.05-0.2 mm.
6. The oil casing high torque resistance, high metal self-sealing threaded joint structure according to claim 1, wherein: the pitch of the incomplete thread part of the external thread (7) is smaller than that of the internal thread (3), and the difference range between the minimum pitch P1 of the incomplete thread part of the external thread (7) and the pitch P of the internal thread (3) is-0.4 to-0.05 mm.
7. The oil casing high torque resistance, high metal self-sealing threaded joint structure according to claim 1, wherein: the length L of the sealing conical surface (9) of the pipe body is 5-8 mm.
8. The oil casing high torque resistance, high metal self-sealing threaded joint structure according to claim 1, wherein: the length D of the transition conical surface (8) lower than the first thread root of the end part of the pipe body is 4-10 mm, and the length I of the inner flat (11) of the pipe end is 5-8 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210325888.0A CN116927676A (en) | 2022-03-30 | 2022-03-30 | High anti moment of torsion of oil casing, high metal self sealss screwed joint structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210325888.0A CN116927676A (en) | 2022-03-30 | 2022-03-30 | High anti moment of torsion of oil casing, high metal self sealss screwed joint structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116927676A true CN116927676A (en) | 2023-10-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210325888.0A Pending CN116927676A (en) | 2022-03-30 | 2022-03-30 | High anti moment of torsion of oil casing, high metal self sealss screwed joint structure |
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| Country | Link |
|---|---|
| CN (1) | CN116927676A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114439384A (en) * | 2020-11-05 | 2022-05-06 | 中国石油天然气股份有限公司 | Sleeve pipe |
-
2022
- 2022-03-30 CN CN202210325888.0A patent/CN116927676A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114439384A (en) * | 2020-11-05 | 2022-05-06 | 中国石油天然气股份有限公司 | Sleeve pipe |
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