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Threaded joint for an oil-well tubing

A technology for threaded joints and oil well pipes, which is applied in the directions of threaded joints, pipes/pipe joints/pipes, drill pipes, etc., and can solve the problems such as the increase of the service life of the connectors and the low service life.

Inactive Publication Date: 2009-06-03
ТЕМЛЮКС ТРАДИНГ ЛИМИТЕД
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] A disadvantage of known joints is their low service life
Therefore, the lifetime increase of the known joints cannot be guaranteed, even if the above-mentioned organizational limitations can be overcome

Method used

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  • Threaded joint for an oil-well tubing
  • Threaded joint for an oil-well tubing
  • Threaded joint for an oil-well tubing

Examples

Experimental program
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Effect test

Embodiment Construction

[0029] The threaded connector of the present invention ( figure 1 ) Includes an externally threaded element 1, such as an oil well pipe or a reducing joint, hereinafter also referred to as a threaded sleeve; and an internally threaded element 2 matching the externally threaded element, such as a joint or a reducing joint, hereinafter also referred to as a joint. The entry section of the joint 2 has a cylindrical counterbore 3. The diameter of the counterbore is slightly larger than the diameter of the unthreaded portion of the threaded nipple 1. The coating 4 applied by the diffusion powder galvanizing method is provided on the threaded part of the joint. The thickness of the coating 4 is generally in the range of 15 to 30 μm, but can also be even thicker-up to 50 μm. A corrosion-resistant phosphate coating with a thickness of several microns is applied on the galvanized coating. The threaded surface of the nipple 1 is not coated, or a standard corrosive phosphate coating with a ...

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PUM

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Abstract

The invention relates to conical threaded tubing joints,used substantially in drilling engineering, and includes two variants of threaded joints for an oil-well tubing. In the first variant, the threaded joint comprises a threaded element (1) provided with an external conical thread and a threaded element (2), which has an internal thread and the threaded part of which is provided with a coating (4) applied by means of a thermodiffusion powder galvanising method. The conical thread is embodied in the form of a vee-thread and the threaded element having the internal thread is provided with an input cylindrical recess (3), the length of which is increased by the tightness increment value which is formed by the coating and calculated according the formula DeltaA=kDelta<min> to kDelta<max>, wherein k is an empirical factor equal to 70 and Delta<min> and Delta<max> are the minimum and maximum thicknesses of the coating, respectively. Said invention makes it possible to provide a correct standard tightness in the threaded joint, the coupling of which is provided with a coating applied by the thermodiffusion powder galvanising method.

Description

Technical field [0001] The present invention relates to tapered threaded connections mainly used in drilling equipment, and more particularly to threaded connection components of oil well pipes or drilling pipes in consumed oil or gas wells. Background technique [0002] The terms and expressions used below are explained as follows. [0003] "Connector or pipe connector" is a detachable component that includes externally threaded elements, such as pipes or reducers of standard materials, sometimes called "union nipples"; and internally threaded elements, such as joints Or reducing joints, hereinafter referred to as "joints". [0004] "Axial screw tightness" or "tightness" is the value measured by the distance between the plane passing through the end of the thread tail on the nozzle and the plane of the joint surface (GOST 633-80). If the threaded end is outside the joint, the tightness is positive, if the threaded end coincides with the joint surface, the tightness is zero, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/08F16L15/00
CPCF16L15/001E21B17/042
Inventor A·V·格蒂曼S·C·斯捷潘诺娃Y·A·特里福诺夫
Owner ТЕМЛЮКС ТРАДИНГ ЛИМИТЕД