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Protector for threaded joint for pipe

A protection device and pipe thread technology, which is applied in pipeline protection, pipe/pipe joint/fitting, drill pipe, etc., can solve the problems of users' quality anxiety

Active Publication Date: 2014-07-23
NIPPON STEEL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0028] In addition, since the part where the solid lubricating coating or solid anti-corrosion coating is peeled off to expose the billet and the part where the sound coating remains, the peeling of the coating is very conspicuous after the protective device is removed. , which makes users feel uneasy about the quality

Method used

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  • Protector for threaded joint for pipe
  • Protector for threaded joint for pipe
  • Protector for threaded joint for pipe

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Embodiment Construction

[0068] Hereinafter, the present invention will be described based on preferred embodiments of the present invention with reference to the drawings.

[0069] The protective device for threaded pipe joints of the present invention can be applied to figure 1 The illustrated coupling-type pipe thread joint can also be applied to an integral pipe thread joint in which one end of a steel pipe is a pin and the other end is a box. As a typical structure, the threaded joint of the coupling type uses the outer peripheral surface of the end of the steel pipe as a pin, and the inner peripheral surface of the coupling as a box, but the inner peripheral surface of the end of the steel pipe can also be made into a Female buckle, the outer peripheral surface of the coupling is made into a male buckle.

[0070] In addition, in the following description, the present invention will be described with respect to a protector mounted on a special threaded joint that has an unthreaded metal contact ...

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Abstract

A protector which prevents damage to a solid lubricating coating on a threaded portion of a threaded joint when the protector is mounted on a pin or a box of a threaded joint for pipes in which at least one of the pin or the box is lubricated with a solid lubricating coating comprises a tubular member having a threaded portion on its inner or outer peripheral surface which threadingly engages with at least a portion and preferably 3-5 complete threads of the threaded portion provided on the pin or the box to be protected. The thread height H1 of the threaded portion of the protector and the thread height H2 of the complete thread of the pin or the box on which the protector is mounted satisfy H1 > H2, and the difference between H1 and H2 [= H1 - H2] is larger than the maximum coating thickness at the thread crest of the solid lubricating coating which covers the threaded portion of the pin or the box.

Description

technical field [0001] The present invention relates to a protection device for protecting a pipe threaded joint, especially a pipe threaded joint for connecting oil country tubular good (OCTG) until the pipe threaded joint is used. The protection device of the present invention is used to protect a threaded joint of pipe lubricated with a solid lubricating film in advance without applying a viscous liquid lubricant to the threaded joint on site before connecting oil well pipes. Background technique [0002] Oil well pipes such as oil pipes and casing pipes used to exploit crude oil and gas oil are connected by pipe threaded joints. Typical pipe threaded joints used to join oil well tubulars adopt a pin-box configuration. The male buckle is a joint element with an external thread, and the female buckle is a joint element with an internal thread. As a typical structure, a pin is formed at the end of a steel pipe serving as an oil well pipe, and a box is formed on the inner ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L57/00
CPCF16L57/005E21B17/006
Inventor 山本泰弘永作重夫大卫·W·克莱姆
Owner NIPPON STEEL CORP
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