DEVICE FOR RESERVOIR TREATMENT AND COLLECTING RESERVOIR PROPERTIES RETENTION Russian patent published in 2007 - IPC E21B43/02 E21B33/12 

FIELD: oil and gas production industry, particularly means to isolate reservoirs inside well during reservoir treatment and operation.

SUBSTANCE: device comprises stem with valve installed in lower stem part. Slide valve is inserted in through channel of the stem in air-tight manner. The slide valve is provided with seat for ball receiving. Packer is located in upper stem part. The packer is made as upper and lower self-sealing collars oriented in different directions and fixedly secured to the stem. Annular recess is made in stem below the packer. The annular recess is limited with upper and lower cones arranged from recess top and bottom accordingly. Cup is installed between upper and lower cones so that the cup may perform axial and rotational movement. Cup is provided with finger fixedly arranged in the cup. Upper and lower slips are arranged from cup top and bottom. The slips have corresponding upper and lower centrators spring-loaded against the cup. Upper and lower slips may cooperate with upper and lower cones correspondingly. Outer stem surface has two short slots and one long slot located between the short ones. The slots are adapted to cooperate with finger and serially communicated with each other through figured slots. One figured slot connects bottom of short longitudinal slot, which is formed as transport one, with center of long longitudinal slot, which is made as working one. Another figured slot links long longitudinal slot bottom to center of short longitudinal one arranged in center of long longitudinal slot and is created as removable part. Stem interior has cylindrical recess with pin and spring-loaded bush arranged in the recess. The spring-loaded bush has alternating short and long axial grooves for pin receiving. The grooves are connected with each other so as bush reciprocates with respect to the stem pin serially passes in short and long axial grooves. Slide valve has fishing head arranged over the seat and provided with radial channels. Slide valve bottom is sealed and provided with springing ring and removable thrust, which may cooperate with cylindrical stem recess. Slide valve has rigid thrust located under the removable thrust and cooperating with bush from above. Stem top is connected with pipe string by means of shear member. Pipe stem additionally has case closing the packer from top thereof. Valve is made as a number of radial slide valve orifices located below rigid thrust and adapted to be closed with seat below cylindrical recess in transport position.

EFFECT: extended range of technical capabilities and simplified technology of device usage.

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