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Screw joint for steel pipe

A technology for threaded joints and steel pipes, which is applied in threaded connections, pipes/pipe joints/fittings, drill pipes, etc., can solve problems such as prone to sticking, and achieve the effect of excellent sticking resistance

Inactive Publication Date: 2012-09-12
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the initial stage of fastening when the threaded portions of the pin and box are not yet engaged, unnecessary contact force is generated on the thread slope due to the difference in pitch between the pin and box, and sticking tends to occur instead. Knot

Method used

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  • Screw joint for steel pipe
  • Screw joint for steel pipe
  • Screw joint for steel pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0084] The following examples are examples for illustrating the present invention and are not intended to limit the present invention. In order to verify the effect of the present invention, the local contact pressure of the threaded thread at the end of the box constituting the threaded joint for steel pipes was evaluated by numerical simulation using the finite element method.

[0085] The threaded joints for steel pipes used in the test are API round threaded joints in the coupling mode for oil well pipes of API specifications 9-5 / 8 inches 47#N80. Simulation analysis was carried out for two states: the state where the threaded joint is tightened to the predetermined fastening position (Vanish Point) and the state where two additional screws are screwed in from the predetermined fastening position.

[0086] Representative specifications of the pipe main body constituting the pin and the coupling main body constituting the box are shown below.

[0087] Tube body

[0088] ...

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PUM

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Abstract

A screw joint for a steel pipe, having improved galling resistance, wherein the screw joint comprises: a pin which is provided with a male thread section having a triangular screw thread; and a box which is provided with a female thread section having a triangular screw thread and engaging with the male thread section, and also with a threadless sleeve section provided to the tip of the box, and wherein the screw joint satisfies the requirements of the standard for round screw joints set forth by the American Petroleum Institute. The threadless sleeve section of the box is reduced in length or eliminated so that the length of the threadless sleeve section in the axis direction of the box is less than or equal to 1 / 2 (including zero) the value defined in the standard. A swoosh section may be provided to the box end and / or the shape of the box which is defined in the standard may be changed so that the bevel angle at the end of the female thread section is within the range of +-15 DEG of the slope angle of the female thread.

Description

technical field [0001] The present invention relates to a steel pipe used for connecting gaseous or liquid underground resources such as crude oil, natural gas, methane hydrate, groundwater, and hot springs buried in the ground (a typical example is an oil well pipe) Threaded joints for steel pipes. More specifically, the present invention relates to improvements in threaded joints for steel pipes, particularly round thread joints specified by American Petroleum Institutes (American Petroleum Institutes, API) standards. Background technique [0002] Steel pipes used in the development of underground resources such as oil well pipes are usually connected by threaded joints. Such threaded joints generally adopt a pin-box structure consisting of a pin with an externally threaded portion and a box with an internally threaded portion threadedly engaged with the externally threaded portion. As a typical structure, the pin is formed on the outer surfaces of both ends of the steel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L15/04
CPCF16L15/001E21B17/042
Inventor 杉野正明永作重夫
Owner NIPPON STEEL CORP
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