FIELD: oil and gas well drilling and overhaul repair, particularly to remove tubing and drilling strings, packers and other equipment stuck in cased wells.
SUBSTANCE: hydraulic jack connected to fishing string of tubing or drilling pipes to be lowered in well comprises hydraulic power cylinders, hydraulic anchor, shaft including facetted rod in nipple having mating profile and connected to the body. Discharge valve is installed over power cylinders so that the valve may cooperate with upper shaft end. Upper shaft end is provided with telescopic pusher. The shaft is hollow along the full shaft length. Facetted rod is connected to sub having seat for check valve ball receiving and flushing pipe. Discharge valve is made as spring-loaded piston with sealing collar. Telescopic pusher consists of guiding bush and sliding collet.
EFFECT: increased efficiency and reliability.
2 cl, 4 dwg
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