OIL PRODUCTION METHOD, AND VALVE DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2012 - IPC E21B43/00 E21B34/10 

FIELD: oil and gas industry.

SUBSTANCE: method involves lowering to the well on tubing string of the layout containing bottom-hole pump, valve device, shank with filter or without it, killing liquid pumping by means of bottom-hole pump through the shank, valve device to tubing string with further displacement to well head. Valve device has the possibility of cutting-off the shank when working fluid containing inhibitors is supplied to it from ground pump station, with simultaneous opening in it of hydraulic valves for oil supply from annular space and working fluid with inhibitors to bottom-hole pump inlet. Valve device includes housing with central and side channels made in it, at least two holes connecting the channels, and at least one hole connecting the side channel to annular space, as well as gate valve in the form of on/off plunger and limit stop of on/off plunger. Plunger has the possibility of connecting the annular space to central channel.

EFFECT: possibility of cutting-off the shank and supply of inhibitors immediately to bottom-hole pump inlet.

7 cl, 4 dwg