Abstract
Conventional rod pumping has been the dominant petroleum recovery technology for nearly a century. As key components of the rod pumping system, tubing and sucker rod coupling are often prematurely scrapped due to “rod/tubing eccentric wear”. To improve the service life of sucker rod coupling and tubing, a Cr7C3 and CrxSy reinforced γ-(Ni, Fe) matrix composite coating was designed by JMatPro simulation and the coating was prepared by plasma transferred arc (PTA) cladding technique. The coating has a refined microstructure composed of Cr7C3 carbide, amorphous sulfide CrxSy and γ solid solution. Primary Cr7C3 fine blocks with volume fraction up to 54% are uniformly dispersed in the coating giving the coating high hardness and good wear resistance. The in-situ synthesized CrxSy phases are dispersed in the γ matrix in the form of fine spherical particles, which endows CrxSy phases strong interfacial bonding, and allows the CrxSy particles to be stripped layer-by-layer, thereby providing continuous lubrication. The coating exhibits excellent wear resistance and low and stable friction coefficient, and is expected to serve as a protective coating for sucker rod coupling to simultaneously improve the service life of sucker rod coupling and tubing.
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