METHOD FOR EXTRACTING MULTI-BED OIL DEPOSIT Russian patent published in 2006 - IPC E21B43/00 

FIELD: oil industry, possible use for extracting oil deposit represented by collectors with varying penetrability.

SUBSTANCE: in accordance to method, vertical and side shafts of wells are driven into beds, product is extracted through product wells and working agent is forced through force wells. At early extraction stage deposit is drilled with vertical shafts. Complex of geophysical research is realized therein. On basis of materials of geophysical research and sampling oil-saturated and water-saturated formations are determined. Their capacity-filtration properties are determined. On basis of resulting data geological model of deposit is built. In cross-section of wells, low penetrability formations are selected with penetrability 3-10 times lower than penetrability of more productive part of cross-section with extraction via side shaft of reserves localized therein. In at least one product well vertical borehole of well is set with inert liquid and drill mud and packed above the perforation interval. From vertical borehole in accordance to inclined direction method side borehole is drilled with deviation from vertical line no more than for 100 meters. In side shaft low penetrability formations are opened up and side borehole is completed using intensifying technologies. Side shaft is choked with inert liquid and filled with drill mud. Vertical well borehole is unpacked. Mud is replaced with water and compressed, causing influx from both boreholes.

EFFECT: increased oil recovery, increased current oil extraction, less time needed for extracting deposit resource.

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