SHARIFOV'S PACKER SYSTEM FOR ISOLATION OF NON-WORK PERFORATION RANGE OR UNTIGHT HOLE SECTION Russian patent published in 2010 - IPC E21B33/12 E21B43/00 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to the device for isolation of untight hole section or non-work perforation range. The packer system comprises two packers lowered in the well on a pipe string; each packer is provided with a body, packing cuffs, a hydraulic anchor thereabove, and an anchoring unit thereunder in the form of a cone and a ram holder with rams, and a stopper fixing a position of the packers. From the top of the upper packer, there is a breaker connector of the pipe string. The upper hydraulic packer provided with a double anchor is lowered higher, while the lower, provided with a single anchor is lower than the untight section or non-work perforation range. Under or between the packers, there is shear bottom valve or a landing nipple for a demountable return valve, either one or several borehole chambers with demountable elements. Below the upper packer or its packing cuffs, there is a packer removing and circulating unit with a sliding mechanical bushing. Between the packers, there can be slip joint provided. The packer system can be additionally equipped with two duplicating mechanical support packers; one of packers is mounted from above the upper packer, and the other one from below the upper hydraulic packer. Between two upper and lower packers, there can be upper and lower hydraulic channels respectively.

EFFECT: invention provides increased reliability, efficiency and tightness of the packer systems.

4 cl, 5 dwg