METHOD FOR EFFECTING FACE-ADJACENT WELL AREA Russian patent published in 2005 - IPC

FIELD: oil industry.

SUBSTANCE: method for effecting face-adjacent zone of well, by preferably horizontal, non-overlapped casing string, by pumping buffers of effect mixture and pressing it into bed, first buffer is fed with mixture of dichlorinemethane, cation-active surfactant, while previously on basis of geophysical data productive ranges of bed are determined, into which at least two hydraulic perforators on tubing strings are lowered, through which into buffers a mixture is fed for effecting productive ranges of bed with nozzle jet flow speed 50-150 m/s, into first buffer, in percents of mass, following is fed: dichlorinemethane 30-50, aromatic hydrocarbon in conjunction with aliphatic hydrocarbon in relation (1-1.5):(1.5-1) - 20-60 and additionally spirits, preferably isopropyl or methyl, r ethylene - 10-30. as surfactant special substance is used with concentration 0.1-0.3 percents of mass. Pumping of mixture is performed from calculation of overlapping of productive ranges of bed for following delivery of it into bed with closed behind-pipe space with pressure lower then compactions pressure of casing column. After pressing mixture into bed technological exposure is performed, about 0.5-1.0 hours, and bed decolmatation by mixture is estimated by its acceleration level, and second buffer is separated in two portion, while both portions are fed with spirits-acidic mixture in percent of mass, of: hydrochloric or fluorine-hydrogen acid 0.5-155, isopropyl spirits or methyl spirits or ethylene spirits 10-30 and surfactant, while first portion of second buffer surfactant is fed 0.8-1.0, into second 0.1-0.3, the rest is water, said mixture is pumped with circulation of it in well through tubing column, hydraulic perforators and behind-pipe space, with forming of excessive pressure.

EFFECT: higher efficiency.

2 tbl