WELL COMPLETION AND OPERATION METHOD FOR UNDERGROUND GAS STORAGE IN WATER-BEARING FORMATION WITH INHOMOGENEOUS LITHOLOGIC STRUCTURE Russian patent published in 2014 - IPC B65G5/00 

FIELD: oil and gas industry.

SUBSTANCE: method includes alternating gas injection and extraction to/from the well and during their alternation one part of the reservoir bed is isolated while the other is penetrated. According to the invention at the well construction stage the production string with a cement-inflatable packer is run in to the well and cemented; at that the packer divides the borehole annulus in the reservoir bed area into two conditional parts. The production string is perforated in both parts above and below the cement-inflatable packer. Thereafter a tubing string with a tubing-casing packer equipped with a circulation valve is run in so that when the tubing string is set to the production string the above circulation valve is placed below the cement-inflatable packer and above the tubing-casing packer between the perforated sections of the production string. Then the space between the production and tubing strings are filled with immiscible portions of the packer fluid. During further operation of the well injection of gas to the reservoir bed is made through the tubing string and lower perforation interval with temporary isolation of the upper perforation interval by one of the packer fluid portions while gas extraction is made through the upper perforation interval and tubular annulus with temporary isolation of the lower perforation interval by the other portion of the packer fluid.

EFFECT: increased efficiency of the method.

2 dwg