METHOD FOR IMPROVEMENT OF HYDRODYNAMIC CONNECTION OF WELL WITH PRODUCTIVE FORMATION Russian patent published in 2012 - IPC E21B43/26 

FIELD: oil and gas industry.

SUBSTANCE: method involves acid fracturing of formation by means of packer mounting above roof of perforated productive formation, pumping of hydraulic fracture liquid to underpacker zone, creation of hydraulic fracture pressure in underpacker zone and forcing-through of hydraulic fracture liquid to crack appeared. After acid fracturing of formation, repeated acid fracturing of formation is performed in two stages. At the first stage crack appeared due to acid fracturing of formation is strengthened by pumping of hydraulic fracture liquid with proppant in quantity enough for measurement of horizontal stresses in carbonate formation and provision of normal direction of the second crack appeared during the second stage of acid fracturing of formation in relation to the first crack. After the first stage of repeated hydraulic fracturing of formation, well is checked for drain through nozzles in increasing sequence of their diameters. At the first stage of hydraulic fracturing of formation jell is used as hydraulic fracturing liquid, at the second stage - acid composition.

EFFECT: simplifying the method and reducing labour intensity, improving efficiency of carbonate formation development due to enlargement of zone of productive formation drainage due to creation of two directed cracks.

1 ex, 2 dwg