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

An elastic sealing thread structure

An elastic sealing and threading technology, applied in drilling equipment, earth-moving drilling, drill pipe, etc., can solve the problems of high price and difficult processing of special threaded joints.

Active Publication Date: 2017-08-01
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Special threaded joints generally have processing difficulties and high prices

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
  • An elastic sealing thread structure
  • An elastic sealing thread structure
  • An elastic sealing thread structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The connection thread structure is J55 steel grade oil pipe with an outer diameter of 73.02mm and coupling 1, the wall thickness is 5.51mm, and the thread is API partial trapezoidal thread. The inner thread of coupling 1 is API partial trapezoidal thread, and there are three sealing grooves 8 starting from 10mm from both sides of the center line of coupling 1, with a distance of 2mm and a diameter of 1mm arc-shaped grooves.

[0022] The threaded end face of the oil well pipe 2 at the factory end is provided with the main seal groove 4-1 at the factory end, with a width of 1 mm and a depth of 2 mm. There are three auxiliary seal grooves 5-1 at the factory end starting from a distance of 10 mm from the end face, with a distance of 2 mm and a width of 1 mm. The depth is 1mm; the threaded end surface of the oil well pipe 3 at the field end is provided with the main sealing groove 4-2 at the field end, which is a two-stage tapered structure, the width of the end face is 1mm, ...

Embodiment 2

[0026] The connection thread structure is N80 steel grade oil pipe with an outer diameter of 244.48mm and coupling 1, the wall thickness is 8.94mm, and the thread is API round thread. The inner thread of coupling 1 is API round thread, and there are three sealing grooves starting at 15mm from both sides of the center line of coupling 1, with a distance of 5mm and a diameter of 2mm arc-shaped grooves.

[0027] The threaded end face of the oil well pipe 2 at the factory end is provided with the main seal groove 4-1 at the factory end, with a width of 2 mm and a depth of 3 mm. There are three auxiliary seal grooves 5-1 at the factory end starting from a distance of 15 mm from the end face, with a distance of 3 mm and a width of 3 mm. 2mm, 2mm deep; the threaded end surface of the oil well pipe 3 at the field end is provided with the main sealing groove 4-2 at the field end, which is a two-stage tapered structure, the end face is 1mm wide, the first stage taper is 5 degrees, and th...

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 relates to an elastic sealing screwed joint, in particular to an elastic sealing screwed structure. The elastic sealing screwed structure comprises a factory end oil well pipe and a site end oil well pipe which are connected through a coupling. Sealing grooves are formed in the positions, 5-150 mm away from the two sides of the center line, of the coupling. A main sealing groove is formed in the end face of the factory end oil well pipe. The width of the main sealing groove is 1-5 mm, the depth of the main sealing groove is 1-10 mm, and a main sealing ring is arranged in the main sealing groove. A main sealing groove is formed in the end face of the site end oil well pipe and is of a two-stage tapered structure, and the width of the end face of the main sealing groove is 1-5 mm. The first stage of taper is 1-10 degrees, and the length is 1-10 mm. The second stage of taper is 10-60 degrees, and the length is 1-10 mm. By the adoption of the elastic sealing screwed structure, processing difficulty is lowered, and cost is reduced.

Description

technical field [0001] The invention relates to an elastic sealing threaded joint. Background technique [0002] In the development of oil and gas fields, the investment in casing and tubing accounts for a large proportion. Therefore, it is particularly important to choose tubing and tubing reasonably. The difference between oil and casing is mainly the difference in thread form. It can be said that the selection of oil and casing is actually the choice of thread connection type. At present, there are two types of thread types used in oil and gas fields at home and abroad: one is API thread, which is manufactured according to the American Petroleum Institute (API) standard; API thread has poor gas sealing performance. Unable to meet the needs of gas well development. The other type is non-API thread, also known as special thread or premium thread (Premium Connections). Aiming at the shortcomings of API joints, special threaded joints, with its unique structural design and...

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 Patents(China)
IPC IPC(8): E21B17/042
Inventor 张永强刘立刘杰尹志福朱世东王珂南蓓蓓封子艳何飞张淑侠
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP