STRAIGHT-FLOW DOWNHOLE CUT-OFF VALVE Russian patent published in 2015 - IPC E21B34/14 

FIELD: oil and gas industry.

SUBSTANCE: cut-off valve includes the following component fixed on a tubing string: a housing with a seat, a valve unit consisting of a hinged flap with a pressure spring, a fixing device consisting of a collet clamp, a movable branch pipe and a return spring. In the upper part of the housing there is a conical neck, and control of closing of the flap is performed by means of a collet clamp lowered by means of a wireline operation, which has clamping teeth on spring brackets, with that, the above clamping teeth are engaged with a groove on the movable tube, as well as diverting projections interacting with the conical neck on the housing. Besides, the housing of the cut-off valve is provided with a branch pipe located below the hinged flap and provided with side holes to receive liquid and with a through holder for a bottomhole apparatus.

EFFECT: improving efficiency of a valve allowing shutdown of the well in operation by shutting off the lower end of the tubing string for the purpose of recording of a pressure recovery curve by independent removed bottomhole apparatus.

5 dwg