FIELD: oil-and-gas industry.
SUBSTANCE: invention relates to device and method allowing the bench estimation in drilling. The proposed device arranged in wellbore, nearby the subsurface bench, comprises the casing, casing fluid inlet, fluid pump communicating with the said casing fluid inlet and incorporating the first piston fitted in the pumping chamber to suck in and discharge fluid when acted upon by tubing pressure.
EFFECT: device and method higher reliability and efficiency, space saving in river drill pipes.
18 cl, 10 dwg
