METHOD FOR HYDRAULIC RESERVOIR FRACTURING INSIDE GAS WELL Russian patent published in 2007 - IPC E21B43/26 

FIELD: oil and gas well industry, particularly to stimulate hydrocarbon influx in gas and gas-condensate wells.

SUBSTANCE: method involves killing well; remanifolding well head; removing production tubing from well and lowering flow string provided with high-pressure packer in well; remanifolding well head; setting packer; performing hydraulic fracturing of reservoir and developing well. Before hydraulic reservoir fracturing flow sting with high-pressure packer is additionally provided with circulation valve and underground equipment necessary for further well operation after hydraulic fracturing termination. Cylindrical nipple for hermetical production tree T-member isolation from working strings thereof is arranged inside production tree. Here cylindrical nipple is fastened between upper flange of buffer gate and production tree T-member buffer or is screwed into upper hanger thread of flow string of production tree cap. Hydraulic reservoir fracturing is carried out in presence of production tree installed at well head and calculated to working pressure of well exploitation. After hydraulic fracturing termination flow string with high-pressure packer, circulation packer and other underground equipment necessary for well exploitation is left in well for total next well exploitation time period. Cylindrical nipple is removed from production tree T-member. Well is developed by circulation valve opening due to technological well liquid substitution for light-weight liquid.

EFFECT: decreased time of assembly works before and after hydraulic reservoir fracturing, decreased time of well inaction.

3 cl, 1 dwg