Duplex-metal coupling

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...

AI Technical Summary

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 the single metal coupling, which solves the problem that the oil well pipe coupling is easily corroded by the fluid in the pipeline. Corrosion failure and stress failure occur, which affect the performance of couplings

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