Nickel-based alloy-coated oil-suction polished rod with high-toughness clamping section and processing method thereof

Abstract

The invention relates to a nickel-based alloy-coated oil-suction polished rod with a high-toughness clamping section and its processing technology. The oil-suction polished rod includes a base material and an alloy coating on the surface of the base material, and the base material is A long straight round rod, one end is an upset end, the other end is an unupset end, starting from the unupset end, the base material sequentially includes a first transition section, a clamping section, a second transition section and a rod body; The alloy coating includes a high-nickel tough composite coating and a nickel-based self-fluxing alloy coating; the surfaces of the first transition section, the clamping section and the second transition section of the substrate have textured patterns. Through the design of the base material structure of the polished rod, a millimeter-level texture pattern structure is introduced on the surface of the base material of the clamping section, and a high-toughness nickel-based alloy coating is applied on the surface to provide an alloy with excellent toughness, wear resistance and corrosion resistance The service life of the oil-coated polished rod is significantly improved.

Description

technical field [0001] The invention relates to petroleum equipment, in particular to a nickel-based alloy coated oil pumping polished rod. Background technique [0002] The oil pumping polished rod is one of the most critical components in oil field artificial lift production. Once the polished rod breaks, it will cause the oil well to stop production and carry out workover operations, resulting in huge economic losses. [0003] Wear, corrosion, and fracture are the three main causes of failure in polished rods. There have been many successful ways to solve wear and corrosion. For example, the nickel-based alloy coating spray-welded polished rod specified in the API 11B and SY / T 5029 standards has solved the wear and corrosion of the polished rod very well, and has become an oil field application. The widest range of polished rods. However, there is a big problem in the fracture of polished rods. Due to the superposition of severe bending alternating stress and tension al...

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Problems solved by technology

[0004] The existing alloy-coated polished rods have been improved in many aspects, such as adjusting the composition of the NiCrBSi self-fluxing alloy coating, and using polished rod base materials with better toughness and fatigue resistance, but the improvement in the service life of polished rods Limited, it is still difficult to effectively solve the fracture of polished rods

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