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Contents of the issue
E.O. Paton Electric Welding Institute, NASU. 11 Bozhenko Str., 03680, Kiev, Ukraine. E-mail: email@example.com
Abstract Peculiarities of defects in worn steel drill bit developing in service at gas well drilling are considered, damage at anomalous wear of water course moving element is described; methods to prepare the worn section for its reconditioning by welding and protective coating deposition are tried out. Special attention is given to analysis of microstructure and chemical inhomogeneity of joint line of steel 40Kh + protective wear-resistant coating, stainless steel 08Kh18N10T + protective wear-resistant coating, stainless steel 08Kh18N10T + steel 40Kh + protective wear-resistant coating; deposited layer microhardness is determined. It is shown that deposition of wear-resistant coating by surfacing provides effective protection from erosive and abrasive wear of bits at drilling of medium and hard rock. Proceeding from the derived data, technology of reconditioning the water course moving element of this drill bit was developed. The drill bit has successfully passed trials at drilling of gas and oil wells in soft, medium-hard and hard rocks in the company «Representative Office USEIS SA» in Poltava region. 2 Ref., 3 Tables, 5 Figures.
Keywords: drill bits, superhard materials, protective coating, surfacing, wear resistance, welding, microhardness, strength, reconditioning of working elements
References 1. Khorunov, V.F., Stefaniv, B.E., Sabadash, O.M. et al. (2012) Peculiarities of wear and criteria of repairability of drill bits with diamond-hard-alloy cutters. The Paton Welding J., 10, 39-43.
2. Khorunov, V.F., Stefaniv, B.E., Sabadash, O.M. et al. (2012) Peculiarities of technologies for repair of drill bits with diamond-hard alloy cutters. In: Problems of resource and service safety of structures, constructions and machines, 488-493. Kiev: PWI.