CN215408508U - Screwed joint based on position control - Google Patents
Screwed joint based on position control Download PDFInfo
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- CN215408508U CN215408508U CN202121742580.3U CN202121742580U CN215408508U CN 215408508 U CN215408508 U CN 215408508U CN 202121742580 U CN202121742580 U CN 202121742580U CN 215408508 U CN215408508 U CN 215408508U
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Abstract
The utility model discloses a threaded joint based on position control, which comprises a male thread and a female thread, wherein the cross sections of the male thread and the female thread are trapezoidal threads, rectangular threads or reversed trapezoidal threads; in the thread structure, the tooth top is parallel to the tooth bottom, the included angle between the tooth side and the tooth top or the tooth bottom is more than or equal to 80 degrees, and the thread taper is 1: 8-1: 14, the height of the thread tooth is 1.0 mm-1.6 mm, and the thread pitch is 6 mm/tooth-8 mm/tooth. The utility model realizes the control of the pipe screwing position in the screwing process by adopting a special thread structure form. By adopting the structure mode, the over-screwing problem of the existing API threaded joint can be avoided; meanwhile, the problems that a conventional special threaded joint needs special torque equipment to be buckled and is complex to operate can be solved.
Description
Technical Field
The utility model relates to the field of petroleum pipe engineering machinery, in particular to a threaded joint based on position control.
Background
The special petroleum pipe is mainly used for drilling oil wells and gas wells and conveying oil wells and gas wells. It comprises an oil drill pipe, an oil casing pipe and an oil pumping pipe. The petroleum drill pipe is mainly used for connecting a drill collar and a drill bit and transmitting drilling power. The petroleum casing pipe is mainly used for supporting the well wall in the drilling process and after well completion so as to ensure the normal operation of the whole oil well after the drilling process and the well completion. The oil pumping pipe mainly conveys oil and gas at the bottom of the oil well to the ground.
Oil casing is the lifeline that maintains the operation of an oil well. Due to different geological conditions, the underground stress state is complex, and the comprehensive action of tensile stress, compression stress, bending stress and torsional stress acts on the pipe body, so that higher requirements are provided for the quality of the casing pipe. Once the casing itself is damaged for some reason, it may cause a reduction in the production of the entire well, or even a rejection.
The first well tubular standard was made by API in 1924, and oil casing joint threads were V-type threads with 10 and 8 threads per inch, but were later replaced with API8 round threads and buttress threads and continued to use today. The API SPEC 5B standard specifies common box threads as round threads (CSG for short) and buttress threads (BCSG for short). The two types of threaded joints are commonly adopted in oil and gas fields in China.
The round thread is divided into a short round thread (CSG for English abbreviation) of the sleeve and a long round thread sleeve (LCSG) of the sleeve. The oil pipe round thread is abbreviated as TBG in English and is subdivided into an un-thickened oil pipe Thread (TBG) and an externally thickened oil pipe thread (UP TBG). The round thread is a shoulder-free taper pipe thread and needs coupling connection, the thread form is a triangle, a round top and a round bottom, the thread form angle is 60 degrees, the thread taper is 1:16, the bisector of the thread form angle is vertical to the axis, and the thread is sealed by the thread flanks of the inner thread and the outer thread after the thread is screwed.
The buttress thread is designed for improving the axial tension or axial compression load resistance and providing leakage resistance, BCSG is abbreviated in English, does not have shoulder taper pipe threads, needs coupling connection, and has a buttress thread shape, a flat top and a flat bottom. The specification of the sleeve buttress thread is 41/2-135/8, the diameter taper is 62.5mm/m, and each 25.4mm5 threads (the thread pitch is 5.08 mm); the included angle between the guide tooth side surface and the vertical line of the thread axis is 10 degrees; the included angle between the bearing side face and the vertical line of the thread axis is 3 degrees; the thread top and the thread bottom are conical and are parallel to the thread taper; the fillet radius of the leading flank crest (0.762 mm R) is larger than the fillet radius of the load flank crest (0.203 mm R), which facilitates make-up and make-up.
Along with the exploration and development of oil and gas in China, especially the increase of wells such as deep wells, ultra-deep wells, high-pressure gas wells, directional wells and wells containing hydrogen sulfide and the like, higher requirements are put on the use performance of oil casing joints, the air tightness, the connection strength and the corrosion resistance of API round threads and buttress threads are not suitable, and the development and the application of special threaded joints are developed for various countries, wherein the representative examples include Blue series and Wedge series of Tenaris company, VAM TOP series and VAM 21 series of VAM company, Lion series and Tiger series of JFE company, SEAL-LOCK series of Hunting company and the like. Such threads are commonly referred to as non-API threads or special threads. The structure, shape and use of such threads are required to be performed primarily with reference to various manufacturer standards or requirements.
Both round and buttress threads of the API standard employ tapered threads and do not have a torque-stop shoulder. The API round thread is mainly subjected to upper buckling control through torque, and the buttress thread is mainly subjected to upper buckling control through a triangular mark on the pipe body. Both of these ways present the risk of over-torquing causing the threaded joint to fail.
The special screwed joint is generally provided with a torque-stopping shoulder, and meanwhile, the accurate torquemeter is adopted for screwing control, so that the risk of over-screwing of the joint is obviously reduced. However, the threaded joint needs to adopt a torquemeter to monitor and record the screwing-in process, the operation is complex, and part of operation manufacturers do not configure the equipment and do not have operation conditions.
Chinese patent publication No. CN201391239Y entitled "a torque shoulder bead weld-welding corrosion-resistant alloy and seal ring sealed connection coupling" discloses a connection coupling with seal ring seal, which includes a steel coupling base body arranged on a pipe body, a torque shoulder with a weld-welding corrosion-resistant alloy layer arranged in the middle of the steel coupling base body, a tool withdrawal groove with a weld-welding corrosion-resistant alloy layer arranged at the outer root of the torque shoulder, and a seal ring arranged in the tool withdrawal groove. The connecting coupling disclosed in the patent document has a simple structure and is convenient to use and operate, the sealing effect is achieved by surfacing the corrosion-resistant alloy and the sealing ring, the connecting coupling can be used for connecting the corrosion-resistant integrity and the sealing integrity of a composite oil pipe and a sleeve, and the connecting coupling cannot be exchanged with a standard sleeve or a joint product.
Chinese patent document CN2409331Y entitled "oil and casing buttress thread joint" relates to an oil and casing buttress thread joint suitable for oil field drilling. The taper of the tooth top on the effective length of the pipe coupling at the beginning end of the tapered pipe thread is slightly increased to 1: T-zeta, and zeta is 4-9. The technical scheme related to the patent document achieves a limiting effect by changing a machining process or thread morphology so as to reduce the risk of the joint sticking buckle, but has certain machining difficulty.
Chinese patent publication No. CN202125257U, entitled "high anti-over torque, high sealing property, thread-sticking prevention oil casing joint", discloses an oil casing joint with high torque resistance, strong sealing property, and good thread-sticking prevention effect. The oil pipe joint is formed by connecting a pipe body with an external thread at the end part and a coupling with an internal thread, wherein a pipe body circular bead, a pipe body sealing surface and a pipe body right-angle circular bead are arranged on the pipe body, the coupling circular bead, the coupling sealing surface and the coupling right-angle circular bead are arranged on the coupling, after the external thread and the internal thread are connected, the pipe body sealing surface and the coupling sealing surface, the pipe body circular bead and the coupling circular bead, the pipe body right-angle circular bead and the coupling right-angle circular bead form three sealing structures respectively, and the external thread and the internal thread are buttress threads with unequal thread heights.
Patent CN203008801U describes a one-piece oil casing threaded joint with a gas-tight seal structure, which is composed of seal portions at both ends and a thread segment in the middle, wherein each seal portion is composed of a seal face and a torque-stopping shoulder. Through the optimized structure, the joint has good sealing performance, is easy to process and convenient to check, and can be screwed for many times under the condition of large torque.
SUMMERY OF THE UTILITY MODEL
The present invention aims to provide a threaded joint based on position control to solve the above technical problems.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a threaded joint based on position control comprises a male thread and a female thread, wherein the cross sections of the male thread and the female thread are trapezoidal threads, rectangular threads or reversed trapezoidal threads; in the thread structure, the tooth top is parallel to the tooth bottom, the included angle between the tooth side and the tooth top or the tooth bottom is more than or equal to 80 degrees, and the thread taper is 1: 8-1: 14, the height of the thread tooth is 1.0 mm-1.6 mm, and the thread pitch is 6 mm/tooth-8 mm/tooth.
As a further scheme of the utility model, the cross sections of the male thread and the female thread are gradually changed along the thread spiral direction, the tooth height is unchanged, the tooth width of the male thread is gradually increased, the tooth width of the female thread is gradually reduced, the tooth width change rate of the male thread and the tooth width change rate of the female thread are the same and are 0.2 mm/tooth-1.0 mm/tooth, namely the tooth width of the male thread is increased by 0.2 mm-1 mm every time the male thread rotates one circle towards the big end direction, and the tooth width of the female thread is reduced by 0.2 mm-1 mm every time the female thread rotates one circle towards the big end direction.
As a further aspect of the present invention, the cross-sectional shapes of the male thread and the female thread are rectangular threads, and one section of the threads is cut, wherein the male thread and the female thread are in a gradually-changed tooth form and are meshed with each other;
in the section of the thread that is cut out,dpthe tooth width of the male thread corresponding to the meshing position,dbthe tooth width of the female thread corresponding to the meshing position,dois the tooth socket gap between the front female thread and the rear female thread,dfor the thread pitch, then:
db+do=d ；
male thread in the direction of precessiondpGradually becomes smaller; female threaddbGradually increasing the thread pitchdFor constant value, the female thread corresponds todoThe size of the magnetic field is gradually reduced,
as the thread is progressively screwed indpAnddbrotating to the corresponding position causes:
db+dp=d；
namely, it isdp=doAt the moment, the male and female threads are jointed, and the threads cannot be screwed in continuously due to the wedge effect formed by the gradually-changed tooth forms of the male and female threads, so that the male and female threads reach an ideal screwing position and are prevented from being screwed;
on the male and female threads respectivelyTaking a proper position point to enable the point to correspond to the tooth width of the male and female threadsdp、dbSatisfies the following conditions:
db+dp=d；
the point is at a distance of the length of the end face of the shoulder of the male threadLpThe point is away from the end face of the female thread by the lengthLbSo thatLpIs greater thanLbSetting up
Δd=Lp-Lb；
In the actual process of screwing the pipe, whether the pipe is screwed in place is judged by observing the clearance between the shoulder end surface of the male thread and the end surface of the female thread after screwing, and when the pipe is screwed out, the clearance between the male end surface and the female end surface is less than or equal toΔdIndicating that the pipe is screwed in place; otherwise, the judgment pipe is not screwed in place.
Compared with the prior art, the utility model has the following advantages: the utility model develops a novel threaded joint, and the control of the pipe screwing position in the screwing process is realized by adopting a special thread structure form. By adopting the structure mode, the over-screwing problem of the existing API threaded joint can be avoided; meanwhile, the problems that a conventional special threaded joint needs special torque equipment to be buckled and is complex to operate can be solved.
Drawings
FIG. 1 is a cross-sectional view of a thread of the present invention (where a is a trapezoidal thread, b is a rectangular thread, and c is an inverted trapezoidal thread).
FIG. 2 is a schematic view of the threaded engagement of the present invention.
FIG. 3 is a schematic view of the threaded engagement of the present invention.
Detailed Description
The utility model is explained in further detail below with reference to the figures and the specific embodiments.
A threaded joint based on position control comprises a male thread and a female thread, wherein the cross sections of the male thread and the female thread are trapezoidal threads, rectangular threads or reversed trapezoidal threads; in the thread structure, the tooth top is parallel to the tooth bottom, the included angle between the tooth side and the tooth top or the tooth bottom is more than or equal to 80 degrees, and the thread taper is 1: 8-1: 14, the height of the thread tooth is 1.0 mm-1.6 mm, and the thread pitch is 6 mm/tooth-8 mm/tooth. The cross sections of the male thread and the female thread are gradually changed along the thread spiral direction, the tooth height is unchanged, the tooth width of the male thread is gradually increased, the tooth width of the female thread is gradually reduced, the tooth width change rate of the male thread and the tooth width change rate of the female thread are the same and are 0.2 mm/tooth-1.0 mm/tooth, namely the tooth width of each rotation circle of the male thread in the direction of the big end is increased by 0.2 mm-1 mm, and the tooth width of each rotation circle of the female thread in the direction of the big end is reduced by 0.2 mm-1 mm.
Referring to fig. 2, the cross-sectional shapes of the male thread and the female thread are rectangular threads, and a section of the threads is cut, wherein the male thread and the female thread are in a gradually-changed tooth form and are meshed with each other;
in the section of the thread that is cut out,dpthe tooth width of the male thread corresponding to the meshing position,dbthe tooth width of the female thread corresponding to the meshing position,dois the tooth socket gap between the front female thread and the rear female thread,dfor the thread pitch, then:
db+do=d ；
male thread in the direction of precessiondpGradually becomes smaller; female threaddbGradually increasing the thread pitchdFor constant value, the female thread corresponds todoThe size of the magnetic field is gradually reduced,
as the thread is progressively screwed indpAnddbrotating to the corresponding position causes:
db+dp=d；
namely, it isdp=doAt the moment, the male and female threads are jointed, and the threads cannot be screwed in continuously due to the wedge effect formed by the gradually-changed tooth forms of the male and female threads, so that the male and female threads reach an ideal screwing position and are prevented from being screwed;
respectively taking appropriate position points on the male and female threads to enable the point to correspond to the tooth width of the male and female threadsdp、dbSatisfies the following conditions:
db+dp=d；
the point is at a distance of the length of the end face of the shoulder of the male threadLpThe point is away from the end face of the female thread by the lengthLbSo thatLpIs greater thanLbSetting up
Δd=Lp-Lb；
In the actual process of screwing the pipe, whether the pipe is screwed in place is judged by observing the clearance between the shoulder end surface of the male thread and the end surface of the female thread after screwing, and when the pipe is screwed out, the clearance between the male end surface and the female end surface is smaller than that of the female end surfaceIs equal toΔdIndicating that the pipe is screwed in place; otherwise, the judgment pipe is not screwed in place.
The concrete case is as follows: the specification of 101.6mm multiplied by 7.8mm is selected, and the inverted trapezoidal thread is designed and used. The tooth top is parallel to the tooth bottom, and the included angle between the tooth side and the tooth top or the tooth bottom is 84.5 degrees. The thread taper is 1: 2, the height of the thread tooth is 1.475mm, and the thread pitch is 7mm per tooth. The tooth width change rate of the male and female threads is 0.3 mm/tooth, namely, the tooth width of the male thread increases by 0.3mm every turn towards the large end, and the tooth width of the female thread decreases by 0.3mm every turn towards the large end.
Selecting a point on the thread such that: (ii) a
db=dp=3.5mm；
The requirement of screw thread fit for screwing the pipe is met.
According to the relationship of the thread structure, surveying and mappingLp=37.3mm，Lb=37 mm. ThenΔd=0.3mm。
And observing the clearance between the shoulder end surface of the male thread and the end surface of the female thread after screwing in the actual pipe screwing process to judge whether the pipe is screwed in place. If the clearance between the male end surface and the female end surface is less than or equal to 0.3mm after the pipe is twisted, the pipe is twisted in place; otherwise, the judgment pipe is not screwed in place.
The foregoing is a preferred embodiment of the present invention, and it will be apparent to those skilled in the art that variations, modifications, substitutions and alterations can be made in the embodiment without departing from the principles and spirit of the utility model.
Claims (2)
1. A threaded joint based on position control is characterized by comprising a male thread and a female thread, wherein the cross sections of the male thread and the female thread are trapezoidal threads, rectangular threads or reversed trapezoidal threads; in the thread structure, the tooth top is parallel to the tooth bottom, the included angle between the tooth side and the tooth top or the tooth bottom is more than or equal to 80 degrees, and the thread taper is 1: 8-1: 14, the height of the thread tooth is 1.0 mm-1.6 mm, and the thread pitch is 6 mm/tooth-8 mm/tooth.
2. A threaded joint based on position control according to claim 1,
the cross sections of the male thread and the female thread are gradually changed along the thread spiral direction, the tooth height is unchanged, the tooth width of the male thread is gradually increased, the tooth width of the female thread is gradually reduced, the tooth width change rate of the male thread and the tooth width change rate of the female thread are the same and are 0.2 mm/tooth-1.0 mm/tooth, namely the tooth width of each rotation circle of the male thread in the direction of the big end is increased by 0.2 mm-1 mm, and the tooth width of each rotation circle of the female thread in the direction of the big end is reduced by 0.2 mm-1 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121742580.3U CN215408508U (en) | 2021-07-29 | 2021-07-29 | Screwed joint based on position control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121742580.3U CN215408508U (en) | 2021-07-29 | 2021-07-29 | Screwed joint based on position control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215408508U true CN215408508U (en) | 2022-01-04 |
Family
ID=79654036
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121742580.3U Active CN215408508U (en) | 2021-07-29 | 2021-07-29 | Screwed joint based on position control |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215408508U (en) |
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2021
- 2021-07-29 CN CN202121742580.3U patent/CN215408508U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A threaded joint based on position control Effective date of registration: 20221118 Granted publication date: 20220104 Pledgee: Xi'an innovation financing Company limited by guarantee Pledgor: XI'AN COMPWELL ENERGY TECHNOLOGY Co.,Ltd. Registration number: Y2022610000765 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |