Unlock instant, AI-driven research and patent intelligence for your innovation.

Thick surface sleeve screwed joint structure with thin-wall of large external diameter

A threaded joint, large outer diameter technology, applied in casing, drill pipe, drilling equipment and other directions, can solve the problems of low thread strength, easy to yield and other problems, and achieve the effect of reasonable design

Active Publication Date: 2018-11-13
TIANJIN STEEL PIPE MFG CO LTD
View PDF12 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the full thread length of the male end is too long, it will cause the end face of the male end to be too narrow. When the make-up is screwed, the rigidity of the end face of the male end is too small, and it is easy to yield when it meets the female shoulder. However, if the complete thread of the male end is too short , resulting in too low thread engagement strength

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Thick surface sleeve screwed joint structure with thin-wall of large external diameter
  • Thick surface sleeve screwed joint structure with thin-wall of large external diameter
  • Thick surface sleeve screwed joint structure with thin-wall of large external diameter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Specification outer diameter D = 339.72mm, wall thickness t = 9.65mm surface casing.

[0036] The thread form is partial trapezoidal thread, the angle of load side is 3 degrees, the angle of lead-in side is 20 degrees, and the tooth height of male thread is H p =2.1mm, female thread tooth height H b =2.3mm, pitch p=8.46mm, thread taper k=1:10, thread diameter E7=339.72-2.1=337.62mm, M=10mm calculated according to formula (1):

[0037] 41.0≤L 7 ≤72.0mm

[0038] According to the formula (2):

[0039] L 7 ≥34.04mm

[0040] L 7 In the range of 41.0mm ~ 72.0mm can meet the design requirements, so choose L 7 = 58.0mm.

Embodiment 2

[0042] As an example, the outer diameter D=406.4mm and the wall thickness t=11.13mm are used as an example.

[0043] The thread form is a hook thread, the load side angle is -4 degrees, the lead-in side angle is 20 degrees, and the tooth height of the male thread is H p =2.2mm, female thread tooth height H b =2.3mm, pitch p=8.46mm, thread taper k=1:9, thread diameter E7=406.4-2.2=404.2mm, M=10mm calculated according to formula (1):

[0044] 38.0≤L 7 ≤91.0mm

[0045] According to the formula (2):

[0046] L 7 ≥38.68mm

[0047] L 7 In the range of 38.68mm ~ 91.0mm can meet the design requirements, so choose L 7 = 65.0mm.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a thick sleeve screwed joint structure with thin-wall of a large external diameter. The thick sleeve screwed joint structure comprises a male end portion processed on a pipe end and a female end portion processed on a box coupling. The male end is provided with a male screw thread, and the female end comprises a female screw thread with taper, a clearance groove and a circular bead. The thick sleeve screwed joint structure is characterized in that after the male screw thread is connected with the female screw thread in a wringing mode, the end surface of the male end abuts against the circular bead of the female end, and the length of the complete screw thread of the male end L7 simultaneously meets the pipe wall thickness range of non-deforming at the pipe end surface and guarantees the connection intensity of screw thread is no less than the yield intensity of a pipe body. The thick sleeve screwed joint structure has the beneficial effects that according to athick surface sleeve with thin-wall of the large external diameter, a complete design method of the length of the screw thread is provided, and on the premise of sufficient connection intensity ensured, the length of the screw thread can be reasonably designed.

Description

technical field [0001] The invention relates to a casing thread connection structure in the field of petroleum industry, in particular to a surface casing thread connection structure with large outer diameter and thin wall thickness. Background technique [0002] The surface casing is the outermost casing in the casing program of oil and gas wells. After the well is drilled, it is drilled to the bedrock below the surface soil layer, or drilled to a certain depth, and then lowered into the surface casing. The surface casing generally has a specification of 339.72mm to 609.6mm. Its main functions are as follows: ①Isolate the upper aquifer to prevent surface water and surface groundwater from seeping into the wellbore; ②Protect the wellhead and reinforce the well wall of the surface soil layer; If you will encounter high-pressure oil and gas layers when you go down, install a blowout preventer on the surface casing to prevent blowout. All the gaps between the surface casing an...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/08
CPCE21B17/08
Inventor 梅丽孙宇杨永昌董清史彬黄永智闫龙陈涛郭强谢冠男柳玉伟吕春莉陈玉鹏
Owner TIANJIN STEEL PIPE MFG CO LTD