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Titanium alloy drill rod

A titanium alloy, drill pipe technology, applied in drill pipe, drill pipe, drilling equipment and other directions, can solve the problems of low joint fatigue performance, high repair rate, poor anti-galling ability of threads, etc., to achieve high fatigue performance, increase Contact area and effect of improving fatigue life

Pending Publication Date: 2022-03-08
SHANGHAI HILONG DRILL PIPE MATERIALS INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the patent of the present invention is to provide a titanium alloy drill pipe connection method, which mainly solves the above technical problems such as poor anti-sticking ability of the thread, high repair rate, and low fatigue performance of the joint when the above-mentioned drill pipe joint is subjected to a large composite load.

Method used

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  • Titanium alloy drill rod
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  • Titanium alloy drill rod

Examples

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Embodiment 1

[0033] Such as Figure 4-Figure 6As shown, a titanium alloy drill pipe includes a drill alloy drill pipe body 1, an internally threaded joint 2 and an externally threaded joint 3 at both ends of the titanium alloy drill pipe body, and the internally threaded joint 2 consists of a welding diameter area 21, a hanging Card area 22, tongs area 23 and internal thread area 24, wherein internal thread area 24 includes internal thread outer end surface 241, tapered internal thread segment 242, internal thread internal end surface 243; Area 31, elevator area 32, tongs area 33 and external thread area 34, wherein the external thread area 34 includes an external thread outer end surface 341, a tapered external thread segment 342 and an external thread internal end surface 343; the internal thread The region 24 is processed with a tapered coarse pitch wedge-shaped dovetail internal thread B, and the external thread region 34 is processed with a tapered coarse pitch wedge-shaped dovetail e...

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Abstract

The invention discloses a titanium alloy drill rod which comprises a titanium alloy drill rod pipe body, an internal thread connector and an external thread connector, wherein the internal thread connector and the external thread connector are arranged at the two ends of the titanium alloy drill rod pipe body. The internal thread connector and the external thread connector at the two ends of the titanium alloy drill rod pipe body are special buckle threads, and the special buckle internal thread connector and the special buckle external thread connector are both tapered coarse-tooth wedge-shaped dovetail threads. The invention provides a high-fatigue-resistance service-life connector which is simple in screwing-on operation, excellent in thread gluing resistance and low in repair rate, and the connection safety and the sealing performance are not affected by combined loads. The problems that an existing titanium alloy drill rod connecting thread is poor in tension resistance, compression resistance and bending resistance, and particularly is prone to thread gluing, high in repair rate, poor in fatigue resistance and the like at a high dog leg degree are solved.

Description

technical field [0001] The invention relates to the technical field of oil drill pipe joints connected by oil well pipe threads, in particular to a titanium alloy drill pipe. Background technique [0002] The oil drill pipes are connected by joints to form a drill string up to several thousand meters. The working conditions of the drill string are very harsh, and the stress situation is very complicated, and the joint is the weakest link in it. The existing titanium alloy drill pipes are designed and delivered according to API5DP and Spec 7-2. [0003] Commonly used drill pipe joints are attached figure 1 As shown, the internal thread 7 is composed of an external shoulder surface 70 and an internal thread portion 71 , and the external thread 8 is composed of an external shoulder surface 80 and an external thread portion 81 . [0004] Commonly used drill pipe joint threads are attached figure 2 As shown, the internal thread part 71 is composed of thread guiding surface R...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/042E21B17/00
CPCE21B17/042E21B17/00
Inventor 鲁喜宁谢孝文欧阳志英舒志强
Owner SHANGHAI HILONG DRILL PIPE MATERIALS INST
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