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Composite pipe threaded joint

A technology of threaded joints and composite pipes, which is used in drill pipes, casings, drilling equipment, etc., can solve the problem that the sealing performance cannot meet the needs of use, and achieve the effect of preventing corrosion failure and high sealing performance.

Inactive Publication Date: 2020-11-24
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because oil is usually buried at a depth of more than 5,000 meters, the highly corrosive fluid in the pipe has a high pressure, and the joint is under a lot of combined forces such as tension, compression, internal pressure, external pressure, bending and torsion. Ordinary sealing performance at joints cannot meet the needs of use

Method used

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  • Composite pipe threaded joint
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Embodiment Construction

[0021] Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0022] Such as Figure 1~5 As shown, the composite pipe threaded joint of the present invention includes a pipe body joint with external threads and a collar joint 5 with internal threads. The pipe body joint includes a pipe body 1 and an inner liner 2 fixed on the inner wall of the pipe body . The pipe body 1 is made of carbon steel, and the lining 2 is made of corrosion-resistant alloy. The purpose of adopting the composite pipe is to reduce the material cost of the pipe, the thickness of the inner lining 2 is 0.5-3 mm, and the pipe body 1 and the inner lining 2 are fixedly connected into one body.

[0023] The pipe body joint has a first threaded section 3, a first transition section 41, a first outer sealing surface section 42, a first shoulder 43 and a first inner sealing surface section 44 arranged in sequence; The second threaded secti...

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Abstract

The invention discloses a composite pipe threaded joint. The composite pipe threaded joint comprises a pipe body joint with an external thread and a coupling joint with an internal thread, and the pipe body joint comprises a pipe body and a lining fixed to the inner wall of the pipe body; the pipe body joint is provided with a first threaded section, a first transition section, a first outer sealing surface section, a first circular bead and a first inner sealing surface section which are sequentially arranged; the coupling joint is provided with a second threaded section, a second transitionsection, a second outer sealing surface section, a second circular bead and a second inner sealing surface section which are sequentially arranged and correspondingly correspond to the first threadedsection, the first transition section, the first outer sealing surface section, the first outer sealing surface section, the first circular bead and the first inner sealing surface section; and the second outer sealing surface section, the second circular bead and the second inner sealing surface section define a groove capable of accommodating the end part of the pipe body joint. The composite pipe threaded joint has the high sealing performance.

Description

technical field [0001] The invention relates to a threaded joint, in particular to a composite pipe threaded joint. Background technique [0002] Some oil reservoir blocks at home and abroad contain highly corrosive components such as high concentrations of H2S, CO2 and Cl ions. Under such high corrosion conditions, ordinary carbon steel pipes are prone to cause problems such as stress corrosion cracking and corrosion perforation, so they cannot To meet the needs of use. According to the requirements of ISO 13680 and ISO 15156 standards, researchers have developed high-alloy pipes that can be used in this well environment. Chemical film to obtain general corrosion resistance and localized corrosion resistance. However, due to the high proportion of alloying elements contained in this alloy material, the material cost remains high, which is more than several dozen times that of ordinary carbon steel pipes. [0003] The pipes (oil pipes and casings) used in the oil and gas ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/02E21B17/08
CPCE21B17/02E21B17/08
Inventor 詹先觉张春霞余夫
Owner BAOSHAN IRON & STEEL CO LTD
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