A study of the resistance of sucker rods to fatigue failure
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The article presents the results of laboratory tests on the fatigue of samples made from full-scale sucker rods of 15H2GMF steel in various corrosive environments. For comparison, similar tests were carried out on corrosion fatigue of samples made from fullscale sucker rods of steels 20N2M, 15H2NMF and 15N3MA. The limited endurance limit of the tested rods of 15H2GMF steel in formation water is 22 lower than that of 20N2M steel and 13 lower than that of 15H2NMF steel, and in an environment simulating the action of H2S it is 34 lower than that of 20N2M steel and 32 lower than that of steel 15H2NMF. The results were obtained using a complex surface method of strengthening sucker rods, which was developed in the laboratory of the Department of Oil and Gas Machines and Equipment of the Ivano-Frankivsk National Technical University of Oil and Gas and tested at the NGVU “Dolynanaftogaz”.