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Threaded joint for an oil-well tubing

A technology for threaded connectors and oil well pipes, applied in threaded connections, pipes/pipe joints/pipe fittings, drill pipes, etc., can solve the problems of unguaranteed increase in the service life of connectors, low service life, etc.

Inactive Publication Date: 2012-06-27
TEMLUX TRADING LTD
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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] Threaded connector of the present invention ( figure 1 ) includes an externally threaded element 1, such as an oil well pipe or a reducer, hereinafter also referred to as a nipple; and an internally threaded element 2 matching the externally threaded element, such as a joint or a reducer, hereinafter also referred to as a joint. The entry section of the connection 2 has a cylindrical counterbore 3 . The diameter of the counterbore is slightly larger than the diameter of the unthreaded part of the nipple 1 . A coating 4 applied by a diffusion powder galvanizing method is provided on the threaded portion 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 a few microns is applied over the galvanized coating. The threaded surface of the nipple 1 is either uncoated or a standard aggressive phosphate coating of 2 to 3 μm thickness is app...

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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=kdeltamin to kdeltamax, wherein k is an empirical factor equal to 70 and deltamin and deltamax 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] This invention relates to tapered threaded connections primarily for use in drilling equipment, and more particularly to threaded connection assemblies for oil well tubing or drilling tubing in spent oil or gas wells. Background technique [0002] The terms and expressions used below are explained as follows. [0003] A "connector or pipe connection" is a detachable assembly consisting of an externally threaded element, such as a pipe or reducer of standard material, sometimes called a "union nipple"; and an internally threaded element, such as a nipple Or reducing joints, hereinafter referred to as "joints". [0004] "Axial thread tightness" or "tightness" is a value measured by the distance between the plane passing through the end of the threaded end on the nipple and the plane of the joint face (GOST 633-80). Tightness is positive if the threaded end is outside the fitting, zero if the threaded end coincides with the fitting face, and negative if...

Claims

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Application Information

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Patent Type & Authority Patents(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 TEMLUX TRADING LTD
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