Duplex-metal coupling

A bimetal and alloy technology, applied in drilling equipment, earthwork drilling, drill pipe, etc., can solve the problems of fluid corrosion in oil well pipe couplings, affecting the performance of couplings, stress failure, etc., to ensure corrosion resistance , Improving the anti-corrosion performance and the effect of preventing corrosion

Pending Publication Date: 2020-08-04
SHANGHAI TIAN YANG STEEL TUBE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the above technical problems, the present invention provides a bimetallic coupling, which adopts a bimetallic composite structure, and a layer of alloy layer is surfacing on the surface of th

Method used

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Embodiment

[0022] combine figure 2 with image 3 , the present invention is a bimetallic coupling used as a connecting piece between oil well pipes 3 . The present invention includes a coupling body 1 . The coupling body 1 can be made of carbon steel or nickel-based alloy, preferably nickel-based alloy. The coupling body 1 is in the form of a hollow sleeve structure, and connection interfaces are arranged symmetrically at both ends of the coupling body 1 . The connecting interface is used for mating connection with the oil well pipe 3 . The connection interface converges gradually toward the middle of the coupling body 1 along the axial direction, forming a trumpet-shaped opening structure; an internal thread 4 is provided on the inner wall of the connection interface. An alloy composite layer 2 is clad on the inner wall of the coupling body 1 by overlay welding. The alloy composite layer 2 is located between the two connection interfaces and has a ring-shaped boss structure. The ...

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Abstract

The invention discloses a duplex-metal coupling. The duplex-metal coupling comprises a coupling body. The coupling body is of a hollow pipe sleeve structure. Connectors are arranged at the two ends ofthe coupling body respectively and symmetrically. Each connector gradually narrows axially in the direction of the middle of the coupling body to be of a horn-shaped open structure. Internal threadsare formed in the inner wall of each connector. An alloy composite layer is arranged on the inner wall of the coupling body in a bead weld composition manner. The alloy composite layer is located between the two connectors and is of a circular boss structure. According to the duplex-metal coupling, on the basis of a mono-metal coupling, the alloy composite layer is formed in the bead weld composition manner with an Inconel 625 alloy material, corrosion caused to the coupling body by fluid in a pipeline can be effectively prevented, and the corrosion resistance is improved; and furthermore, modification can be carried out on a coupling in the prior art, the modification cost is low, the application range is broad, connection is solid and reliable, and the durability is good.

Description

technical field [0001] The invention relates to the field of composite pipes, in particular to a bimetal coupling. Background technique [0002] With the rapid development of my country's economy, the demand for petroleum energy is also soaring. However, the environment for oil exploitation is getting worse, the depth of oil reserves is deep, and the formation temperature is high, which makes the development conditions very harsh, and ultimately seriously affects the economic development of our country. The quality of the tubing is a powerful guarantee for the smooth exploitation of oil. Couplings are intermediate connectors used to connect two oil well pipes. The threaded connection between the oil well pipe and the coupling is the key link to ensure the normal operation of the oil well pipe. Tubing is the key technical equipment in the production process of oil and gas fields. Statistics show that 80% of the failure accidents of tubing and casing occur in threaded joint...

Claims

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Application Information

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IPC IPC(8): E21B17/02
CPCE21B17/02
Inventor 何建忠
Owner SHANGHAI TIAN YANG STEEL TUBE
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