FIELD: oil and gas production industry. SUBSTANCE: this is used when high axial forces are needed in well bore. Hydraulic ram has two or more successively interconnected power units, each of them is made up of cylinder, piston with sealing gland of rod. Piston of each power unit is connected with rod with possibility of radial displacement. Rod sealing gland can be radially displaced relative to hydraulic cylinder body. Provided over perimeter of piston is space filled with anticorrosive lubricant which is in contact with inner surface of hydraulic cylinder and which is hydraulically connected with high-pressure zone. EFFECT: high efficiency. 1 dwg
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