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This paper reports the results of study of the influence of gas content in working fluid on the dynamics of hydraulic drive of equipment for oil and gas well development. A mathematical model of the hydraulic drive obtained in the Cauchy form is proposed. The dependence of piston speed, pressure in the piston chamber of the hydraulic cylinder, and pressure in the rod chamber of the hydraulic drive on time at 0 and 8% undissolved gas content in the fluid is established.

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