DEVICE FOR DEVELOPMENT OF RESERVOIRS IN WELL Russian patent published in 2011 - IPC E21B33/12 

FIELD: oil and gas production.

SUBSTANCE: device for development of reservoirs in well consists of main and additional packers spaced with hollow borehole with radial channels shut off by means of bush with seat for fall ball. The main packer consists of a collar installed between an upper support and a lower conic support and of a through case with a shaped slot below the lower support. An axial travelling ring with a pin, centralisers and bowl slip sockets is arranged on the through case. The additional packer made of an upper stop with a cylinder bush, of a lower stop and of additional collar set on the cylinder bush between the stops. The lower stop is rigidly attached to an upper part of the borehole, while the upper stop is equipped with an anchor and is connected to a pipe string. The fall ball is made in form of a fixed gate element. The bush with the seat corresponds to a hollow cylinder. The upper stop is sectional and consists of the anchor, of the support case with internal cylinder recess and interacting with an additional elastic collar, and of the cylinder bush rigidly connected with the pipe string through a process branch made with radial channels and inserted into the support case of the upper stop. The anchor is assembled of cone sectors with an internal recess; the sectors are connected with the support case and can travel radially. The hollow case is pressed upwards and can perform restricted travels downwards relative to the cylinder bush with die heads spring loaded inwards. The circular recess for the spring ring and upper and lower circular lugs with conic faces are made on external surface of the cylinder bush. The upper circular lug interacts with the die heads. The lower one is positioned in internal recesses of the sectors of the cone. Also, on internal surface of the support cone between the cylinder recess and the cone sectors there is made a circular restriction located below the circular recess of the cylinder bush and interacting with the spring ring. The circular restriction has upper and lower faces. The lower one allows the spring ring passing through the circular restriction of the support case downwards only after packing the elastic collars in the well, while the upper one - upwards before packing with permissible force. The radial channels of the process branch are shut off with a cartridge fixed by means of a destructible screw and equipped for an additional gate element with the process seat, through diametre of which is bigger, than diametre of the fixed shut off element for the bush seat.

EFFECT: successive development of three reservoirs in well at one round-trip operation and at one packer seating at combination with reliable fixation of anchor on internal walls of casing string regardless from reagents pumping pressure in any volumes and of any viscosity.

8 dwg