Nickel base alloy coating smooth sucker rod with high-toughness clamping section and machining method thereof

Abstract

The invention relates to a nickel base alloy coating smooth sucker rod with a high-toughness clamping section and a machining method thereof. The smooth sucker rod comprises a base material and an alloy coating located on the surface of the base material. The base material is a long and straight round rod, one end of the base material is an upset end, and the other end of the base material is a non-upset end. Starting from the non-upset end, the base material sequentially comprises a first transition section, the clamping section, a second transition section and a rod body. The alloy coating comprises a high-nickel high-toughness composite coating and a nickel base self-fluxing alloy coating. The surfaces of the first transition section, the clamping section and the second transition section of the base material are provided with texture patterns. Through the design of the base material of the smooth sucker rod, by introducing the millimeter-scale texture patterns into the surface of the clamping section of the base material and using the high-toughness nickel base alloy coating on the surface of the base material, the alloy coating smooth sucker rod with excellent toughness, wearresistance and corrosion resistance is provided, and the service life of the smooth sucker rod is remarkably prolonged.

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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