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Evaluation of gas hydrate deposits has imposed a large number of explorations. This has involved the design of new drilling and logging tools. In this paper are presented the results of the analysis of the fluid flow in the coring HRC used for logging works for offshore gas hydrate. The analysis showed the correlation between pressure losses in the flow system with pressure loss on the hydraulic motor. Has been carried out and a numerical analysis with bay-pas FLOTRAN area. The results confirmed the analytical method of the analysis of the fluid flow.