CN204002601U - The incompressible casing threaded connection structure of triple seal - Google Patents
The incompressible casing threaded connection structure of triple seal Download PDFInfo
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- CN204002601U CN204002601U CN201420395249.2U CN201420395249U CN204002601U CN 204002601 U CN204002601 U CN 204002601U CN 201420395249 U CN201420395249 U CN 201420395249U CN 204002601 U CN204002601 U CN 204002601U
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- casing joint
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Abstract
The utility model discloses the incompressible casing threaded connection structure of a kind of triple seal, by thering is the female casing joint of externally threaded sleeve pipe and tool, spin and form, the screw thread that sleeve pipe and casing joint adopt is inclined to one side trapezoidal tapers screw thread, the head of sleeve pipe is provided with external cylindrical surface and sphere, on the inwall of casing joint, be provided with the inner cylinder face of this external cylindrical surface elasticity interference fit and with the internal conical surface of this sphere elasticity interference fit, the head of sleeve pipe is also provided with outer moment of torsion step, the inner of casing joint is provided with the internal torque step coordinating with this outer moment of torsion step.The intensity that is threaded of the present utility model is high, and sealing performance is stable, spins easily and is difficult for slippage, can the incompressible and anti-moment of torsion of crossing.
Description
Technical field
The utility model relates to the incompressible casing threaded connection structure of a kind of triple seal, relate to oil, natural gas probing casing threaded connection structure technical field, mainly in industrial gas oil, oil gas field is used, and is applied to deep-well, ultradeep well, high-pressure gas well, superelevation hot-well, directional well, bad ground structure well etc. and requires bonding strength and the higher Oil/gas Well of sealing performance.
Background technology
At present, oil well pipe is the long tubing string of km single oil well pipe being formed by connecting by special screw thread, comprises casing string, tubing string.Casing string is lowered to and is drilled to well, for preventing that formation fluids and stratum from squeezing, ruins.In tubing string servant production casing post, form the passage on downhole oil gas-bearing formation and ground, control flowing of former oil and gas.
Exploration and development along with China's oil gas, especially the well such as deep-well, ultradeep well, high-pressure gas well, sulfide hydrogen increases, functional performance to cover casing joint is had higher requirement, and the tightness of existing API round thread and buttress thread, switching performance, corrosion resistance can not meet actual prospecting bit requirement.Connection between existing cover casing joint and hermetically-sealed construction unstable, connects and realizes by screw thread, and sealing realizes by overlapping the interference pressing of casing joint thread, and this connection hermetically-sealed construction mainly exists following defect in actual use:
1. all there is error in external screw thread and the internal thread machining due to connecting thread, and both bonding surfaces must have gap, no matter use which kind of thread type, and liquid, gas and the grease thing that contains tiny solid particle can be therefrom by infiltrations.Oil pipe and cover casing joint conjunction go into the well and use procedure in, bear multiple combined load, comprising compressive load, tensile load, bending load, and different at the resistance that different depth layer oil pipe and cover casing joint are suffered, when oil pipe is with cover casing joint when in junction, suffered load resistance is not identical, between oil pipe and cover casing joint, very easily produce loosening, thereby make original seal failure, cause oil or natural gas under high pressure easily excessive along the infiltration of screw thread bonding surface.
2. when the conjunction of oil pipe and cover casing joint is compressed load or high moment of torsion in down-hole, must produce compressive strain, make to form gap between oil pipe end face and oil jacket casing joint inner face, thereby cause seal failure.
How solving sleeve pipe is two hang-ups at the reliable sealing performance being compressed under load and high torque condition.
Summary of the invention
Technical problem to be solved in the utility model is the defect that overcomes prior art, provide a kind of triple seal incompressible casing threaded connection structure, its intensity that is threaded is high, and sealing performance is stable, spin easy and be difficult for slippage, can the incompressible and anti-moment of torsion of crossing.
In order to solve the problems of the technologies described above, the technical solution of the utility model is: the incompressible casing threaded connection structure of a kind of triple seal, by thering is the female casing joint of externally threaded sleeve pipe and tool, spin and form, the screw thread that sleeve pipe and casing joint adopt is inclined to one side trapezoidal tapers screw thread, the head of sleeve pipe is provided with external cylindrical surface and sphere, on the inwall of casing joint, be provided with the inner cylinder face of this external cylindrical surface elasticity interference fit and with the internal conical surface of this sphere elasticity interference fit, the head of sleeve pipe is also provided with outer moment of torsion step, the inner of casing joint is provided with the internal torque step coordinating with this outer moment of torsion step.
Further, in order to avoid moving twisting in moment of torsion rundown process to cause head end dieback phenomenon, the external cylindrical surface of described sleeve pipe head and outer moment of torsion step are with protruding spherical transition, and the internal conical surface of casing joint the inner and internal torque step are with concave spherical surface transition.
Further, for guide effect being played in sealing position in upper button and shackle process, the inner cylinder face place of casing joint is with initial arc surface.
Further provide a kind of tapering of relatively optimizing to reach its good sealing effectiveness, the tapering of the inclined to one side trapezoidal tapers screw thread that described sleeve pipe and casing joint adopt is 1:16.
A kind of design parameter of form of thread of internal thread of casing joint is further provided, the form of thread parameter of the internal thread of described casing joint is as follows: load side angle [alpha]=+ 2.5 °～+ 3.5 °, guiding side angle beta=+ 9.5 °～+ 10.5 °, tooth top and tooth root are parallel to bus.
Further, the magnitude of interference of the interference fit between external cylindrical surface and inner cylinder face is 0.05～0.3mm, and both axial lengths of contact are 0.5～30mm.
Further, the interface width between sphere and internal conical surface is 2～5mm, and the cone angle of its internal conical surface is 12 °～14 °.
Further for make fluid in tubing string by time flow speed stability, avoid that connecting portion is produced to eddy current and wash away phenomenon, the inner hole wall straight transitions of the inner hole wall of sleeve pipe and casing joint or tapered transition.
Adopted after technique scheme, between sleeve pipe and casing joint, form three road metallic elastic interference sealings, wherein primary seal is partly by the external cylindrical surface of sleeve outer wall and the inner cylinder face interference fit of casing joint, realization is in combined load lower seal stability, secondary sealing adopts the sphere of sleeve outer wall and the internal conical surface interference fit of casing joint, under suitable metallic elastic interference fit effect, make connecting portion produce the effect that compressive yield stress plays lift-off seal performance being compressed contact surface under load or high torque condition, the outer moment of torsion step of sleeve pipe outer end matches with the internal torque step of casing joint, not only be convenient to accurately control to spin tighten position, and contribute to further to improve the reliability of sealing, this casing threaded connection structure is upper, in shackle process, screw thread mainly plays connection function, sleeve pipe extends to the large end of sleeve pipe body to disappearing by the small end screw thread near head continuously by certain taper, casing joint extends to body middle part small end screw thread by the large end internal thread of end continuously by certain taper, the guiding guide surface that adopted buttress thread wide-angle hypotenuse to spin as sleeve external thread position and casing joint internal thread position in upper when button, buttress thread low-angle hypotenuse screws rear stretch-proof de'collement as sleeve external thread position and casing joint internal thread position, can reach the effect that is equal to intensity with body.
In sum, the feature of the incompressible casing threaded connection structure of this triple seal is as follows:
1, the intensity that is threaded is high;
2, high sealing performance under compressive state;
3, upper button is easy, is difficult for thread alternating;
It is 4, anti-that torque capability is strong excessively;
5, two kinds of designs of connecting portion endoporus, not only can make fluid in tubing string by time flow speed stability, avoid that connecting portion is produced to eddy current and wash away phenomenon, and endoporus is straight, and surdimensionnement can play high resistance compression, the taper of band angle excessively can be played high resistance torsion effect.
Accompanying drawing explanation
Fig. 1 is the screw connection structure schematic diagram between sleeve pipe and casing joint;
Fig. 2 is a kind of structural representation of connecting thread;
Fig. 3 be sleeve pipe with casing joint between be threaded and the enlarged diagram of hermetically-sealed construction before spinning;
Fig. 4 be sleeve pipe with union between be threaded and the enlarged diagram of hermetically-sealed construction after spinning;
In figure: 11-sleeve pipe; 21-casing joint; 12-external cylindrical surface; 13-sphere; The protruding sphere of 14-; 22-inner cylinder face; 23-internal conical surface; 24-concave spherical surface; The initial arc surface of 25-; The outer moment of torsion step of 16-; 26-internal torque step.
The specific embodiment
For content of the present utility model is more easily expressly understood, according to specific embodiment also by reference to the accompanying drawings, the utility model is described in further detail below.
Oil field use the main specifications of sleeve pipe have 4-1/2 " (114.3mm), 5 " (127mm), 5-1/2 " (139.7mm), 6-5/8 " (168.3mm), 7 " (177.8mm) etc., the most frequently used with 5-1/2 " and 7 " specification.Illustrating below, with regular size 5-1/2 " sleeve pipe (139.7*9.17mm), is illustrated the feature of casing threaded connection structure:
As shown in Fig. 1～4, the incompressible casing threaded connection structure of a kind of triple seal, by thering is the female casing joint 21 of externally threaded sleeve pipe 11 and tool, spin and form, the screw thread that sleeve pipe 11 and casing joint 21 adopt is inclined to one side trapezoidal tapers screw thread, the head of sleeve pipe 11 is provided with external cylindrical surface 12 and sphere 13, on the inwall of casing joint 21, be provided with the inner cylinder face 22 of this external cylindrical surface 12 elasticity interference fit and with the internal conical surface 23 of these sphere 13 elasticity interference fit, the head of sleeve pipe 11 is also provided with outer moment of torsion step 16, the inner of casing joint 21 is provided with the internal torque step 26 coordinating with this outer moment of torsion step 16.
In order to avoid moving twisting, in moment of torsion rundown process, cause head end dieback phenomenon, as shown in Figure 4, the external cylindrical surface 12 of sleeve pipe 11 heads is with outer moment of torsion step 16 with protruding sphere 14 transition, and the internal conical surface 23 of casing joint 21 the inners and internal torque step 26 are with concave spherical surface 24 transition.The radius of protruding sphere 14 can adopt R=0.6mm; The radius of concave spherical surface 24 can adopt R=0.4mm.
As shown in Figure 4, inner cylinder face 22 places of casing joint 21 are with initial arc surface 25.
The tapering of the inclined to one side trapezoidal tapers screw thread that sleeve pipe 11 and casing joint 21 adopt is 1:16.
As shown in Figure 2, this screw connection structure is according to the high feature of API5B standard buttress thread bonding strength, design principle according to API standard buttress thread, adopt load side angle [alpha]=+ 2.5 ° of form of thread～+ 3.5 °, guiding side angle beta=+ 9.5 °～+ 10.5 °, tooth top and tooth root are parallel to bus, for casing joint 21 its pitch, be 5.08mm, i.e. 5 teeth/per inch, in the buttress thread dimensional parameters design of API standard, improve, make the bonding strength of threaded portion meet or exceed the intensity of body itself.
The magnitude of interference of the interference fit between external cylindrical surface 12 and inner cylinder face 22 is 0.05～0.3mm, and both axial lengths of contact are 0.5～30mm; In this example, large 0.12～0.15 millimeter than the diameter of inner cylinder face 22 of the diameter of external cylindrical surface 12, the axial length of sealing is 8 millimeters.
Interface width between sphere 13 and internal conical surface 23 is 2～5mm, and the cone angle of its internal conical surface 23 is 12 °～14 °.The radius of sphere 13 can adopt R=12mm.
Boring technique after this casing threaded connection structure employing pipe end shrink mouth, makes the original endoporus d of body, choke divide body bore hole inner diameter d 1 and box cupling through hole d1 ', and three's endoporus is straight to be seamlessly transitted; Or divide tapering transition between body bore hole inner diameter d 1 and the original endoporus d of body to form the effect that Figure shape effect reaches high torque resistant by choke.
Along with petroleum industry is severe to geological conditions, the exploration and development of the deep-well of hole condition condition harshness, ultradeep well, high-pressure oil-gas well, and the application of directional well, water filling thermal production well technology, the high sealing performance joint that possesses anti-compression properties is absolutely necessary, and its demand will rise gradually.
Operating principle of the present utility model is as follows:
Between sleeve pipe 11 and casing joint 21, form three road metallic elastic interference sealings, wherein primary seal is partly by the external cylindrical surface 12 of sleeve pipe 11 outer walls and inner cylinder face 22 interference fit of casing joint 21, realization is in combined load lower seal stability, secondary sealing adopts the sphere 13 of sleeve pipe 11 outer walls and internal conical surface 23 interference fit of casing joint 21, under suitable metallic elastic interference fit effect, make connecting portion produce the effect that compressive yield stress plays lift-off seal performance being compressed contact surface under load or high torque condition, the outer moment of torsion step 16 of sleeve pipe 11 outer ends matches with the internal torque step 26 of casing joint 21, not only be convenient to accurately control to spin tighten position, and contribute to further to improve the reliability of sealing, this casing threaded connection structure is upper, in shackle process, screw thread mainly plays connection function, sleeve pipe 11 extends to the large end of sleeve pipe 11 body to disappearing by the small end screw thread near head continuously by certain taper, casing joint 21 extends to body middle part small end screw thread by the large end internal thread of end continuously by certain taper, the guiding guide surface that adopted buttress thread wide-angle hypotenuse to spin as sleeve pipe 11 external screw thread positions and casing joint 21 internal thread positions in upper when button, buttress thread low-angle hypotenuse screws rear stretch-proof de'collement as sleeve pipe 11 external screw thread positions and casing joint 21 internal thread positions, can reach the effect that is equal to intensity with body.
Above-described specific embodiment; technical problem, technical scheme and beneficial effect that the utility model is solved further describe; institute is understood that; the foregoing is only specific embodiment of the utility model; be not limited to the utility model; all within spirit of the present utility model and principle, any modification of making, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
Claims (8)
1. the incompressible casing threaded connection structure of triple seal, by thering is externally threaded sleeve pipe (11) and the female casing joint of tool (21), spin and form, it is characterized in that: the screw thread that sleeve pipe (11) and casing joint (21) adopt is inclined to one side trapezoidal tapers screw thread, the head of sleeve pipe (11) is provided with external cylindrical surface (12) and sphere (13), on the inwall of casing joint (21), be provided with the inner cylinder face (22) of this external cylindrical surface (12) elasticity interference fit and with the internal conical surface (23) of this sphere (13) elasticity interference fit, the head of sleeve pipe (11) is also provided with outer moment of torsion step (16), the inner of casing joint (21) is provided with the internal torque step (26) coordinating with this outer moment of torsion step (16).
2. the incompressible casing threaded connection structure of triple seal according to claim 1, it is characterized in that: the external cylindrical surface (12) of described sleeve pipe (11) head is with outer moment of torsion step (16) with protruding sphere (14) transition, and the internal conical surface (23) that casing joint (21) is inner and internal torque step (26) are with concave spherical surface (24) transition.
3. the incompressible casing threaded connection structure of triple seal according to claim 1 and 2, is characterized in that: the inner cylinder face (22) of casing joint (21) is located with initial arc surface (25).
4. the incompressible casing threaded connection structure of triple seal according to claim 1, is characterized in that: the tapering of the inclined to one side trapezoidal tapers screw thread that described sleeve pipe (11) and casing joint (21) adopt is 1:16.
5. according to the incompressible casing threaded connection structure of the triple seal described in claim 1 or 4, it is characterized in that: the form of thread parameter of the internal thread of described casing joint (21) is as follows: load side angle [alpha]=+ 2.5 °～+ 3.5 °, guiding side angle beta=+ 9.5 °～+ 10.5 °, tooth top and tooth root are parallel to bus.
6. the incompressible casing threaded connection structure of triple seal according to claim 1, it is characterized in that: the magnitude of interference of the interference fit between described external cylindrical surface (12) and inner cylinder face (22) is 0.05～0.3mm, both axial lengths of contact are 0.5～30mm.
7. the incompressible casing threaded connection structure of triple seal according to claim 1, it is characterized in that: the interface width between described sphere (13) and internal conical surface (23) is 2～5mm, and the cone angle of its internal conical surface (23) is 12 °～14 °.
8. the incompressible casing threaded connection structure of triple seal according to claim 1, is characterized in that: inner hole wall straight transitions or the tapered transition of the inner hole wall of described sleeve pipe (11) and casing joint (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420395249.2U CN204002601U (en) | 2014-07-16 | 2014-07-16 | The incompressible casing threaded connection structure of triple seal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420395249.2U CN204002601U (en) | 2014-07-16 | 2014-07-16 | The incompressible casing threaded connection structure of triple seal |
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| CN204002601U true CN204002601U (en) | 2014-12-10 |
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| CN201420395249.2U Active CN204002601U (en) | 2014-07-16 | 2014-07-16 | The incompressible casing threaded connection structure of triple seal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104929533A (en) * | 2015-05-29 | 2015-09-23 | 聊城安泰石油机械有限公司 | Hermetic connector for ATPM-II oil tube and casing, tube block and coupling |
| CN106761462A (en) * | 2016-12-27 | 2017-05-31 | 中国石油天然气集团公司 | A kind of oil well casing special nipple |
-
2014
- 2014-07-16 CN CN201420395249.2U patent/CN204002601U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104929533A (en) * | 2015-05-29 | 2015-09-23 | 聊城安泰石油机械有限公司 | Hermetic connector for ATPM-II oil tube and casing, tube block and coupling |
| CN106761462A (en) * | 2016-12-27 | 2017-05-31 | 中国石油天然气集团公司 | A kind of oil well casing special nipple |
| CN106761462B (en) * | 2016-12-27 | 2019-01-18 | 中国石油天然气集团公司 | A kind of oil well casing special nipple |
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