DEVICE FOR WET STRATUM DEVELOPMENT Russian patent published in 2015 - IPC E21B43/12 E21B34/12 

FIELD: oil and gas industry.

SUBSTANCE: device includes a pipe string lowered into well and packer with flow shutdown element installed in it; the element is made in form of a hollow case having orifices positioned above the packing element of the packer and interconnected with over-the-packer space. Inside the hollow body there is a pipe concentric to its axis and fixed rigidly to the pipe string from top and to the piston from bellow. The pipe with piston is axially movable in relation to the hollow body from the flow shutdown. The piston is made hollow and plugged from below. At that the piston is complete with the upper and lower rows of feedthrough openings. Moreover in the hollow case of the packer packing element there is a lower row of openings interconnected to over-the-packer space in the well. At that from the top at inner surface of the hollow case there is a closed cam slot shaped as successively alternating middle, short and long longitudinal grooves, which are interconnected in the upper part. At that in the closed cam slot of the hollow case there is a movable guide pin fixed rigidly in the piston above its upper row of feedthrough openings. When the guide pin is located in the middle longitudinal groove of the closed cam slot space below and above the packer in the well is interconnected with inner space of the pipe by the respective openings of the upper row in the case and upper row of openings in the piston and also by the respective openings of the lower row in the case and lower row of openings in the piston. When the guide pin is located in the short longitudinal groove of the closed cam slot space above the packer in the well is interconnected with inner space of the pipe by the upper row of openings in the case and lower row of openings in the piston. At that space below the packer is shut down by the piston hermetically. When the guide pin is located in the long longitudinal groove of the closed cam slot space below the packer in the well is interconnected with inner space of the pipe by the lower row of openings in the case and upper row of openings in the piston. At that space above the packer is shut down by the piston hermetically.

EFFECT: more reliable operation of the device.

4 dwg