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Tubular connection with self-locking threading used in the oil industry

A technology of threaded connectors and connectors, applied in the direction of threaded connections, pipes/pipe joints/pipes, drill pipes, etc., can solve the problems of thread self-locking position fluctuation and weakening of thread self-locking characteristics.

Active Publication Date: 2011-11-23
VALLOUREC OIL & GAS FRANCE SAS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, the self-locking feature of the thread is weakened, which means that the self-locking position of the thread becomes fluctuating considering the machining imprecision

Method used

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  • Tubular connection with self-locking threading used in the oil industry
  • Tubular connection with self-locking threading used in the oil industry
  • Tubular connection with self-locking threading used in the oil industry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0040] figure 1 The prior art threaded tubular connection shown in comprises a tubular element provided with a male end 1 and a tubular element provided with a female end 2, and each tubular element is provided with a corresponding tapered threaded area 3a, 4a , the threaded areas 3a, 4a fit together to connect to each other by a make-up of the two elements. The threaded areas 3a, 4a are of the known "self-locking" type (ie the axial width of the threads and / or the spacing between the threads varies gradually) so that a gradual axial tightening occurs during snap-in until final locking Location.

[0041] Figure 7 The "self-locking" feature of the threaded area is shown in more detail. The term "self-locking threaded region" refers to a threaded region comprising the features described in detail below. Like the female threads (or teeth) 42, the male threads (or teeth) 32 have a constant lead, but their width decreases in the direction of their respective end surfaces 7, 8 ...

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PUM

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Abstract

The invention concerns a threaded connection comprising a first and a second tubular component, each being provided with a respective male (1) and female (2) end, the male end (1) comprising, on its external peripheral surface, at least one threaded zone (3) and finishing in a terminal surface (7) which is orientated radially with respect to the axis (10) of the connection, the female end (2) comprising, on its internal peripheral surface, at least one threaded zone (4) and finishing in a terminal surface (8) which is orientated radially with respect to the axis (10) of the connection, the male threaded zone (3) having a first portion in which the width of the teeth, CWTp, increases from a value CWTpmin corresponding to the width of the tooth which is closest to the terminal surface (7) of the male end (1); to a value CWTpmax corresponding to the width of the tooth which is furthest from said terminal surface (7), while the width of the teeth CWTb of the female threaded zone (4) decreases from a value CWTbmax corresponding to the width of the tooth which is furthest from the terminal surface (8) of the female end (2) to a value CWTbmin corresponding to the width of the tooth whichis closest to said terminal surface (8), such that the threaded zones (3, 4) cooperate in accordance with self-locking make-up, characterized in that:CWTpmin / CWTbmax = 0.2 and CWTbmin / CWTpmax = CWTpmin / CWTbmax

Description

technical field [0001] The invention relates to a threaded connection with a self-locking thread comprising first and second tubular parts, one provided with a tubular male end and the other provided with a tubular female end, each provided with a threaded region , the threaded areas are capable of fitting into a locked position in a self-locking tightening manner when one is snapped into the other. Background technique [0002] In a known manner, conventionally connected by snap-fitting, the pipe will constitute the casing or tubing string in the case of operating hydrocarbon wells. Typically, such tubes comprise an end provided with a male threaded area and an end provided with a female threaded area, each end to be assembled by snap-fitting with a corresponding end of the other part, the assembly defining a connector . The tubing string thus formed may be rotated when drilling has been performed horizontally to allow said tubing string to advance towards the bottom of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L15/06E21B17/042
CPCF16L15/06F16L15/001E21B17/042
Inventor P·马丁E·韦尔热
Owner VALLOUREC OIL & GAS FRANCE SAS