METHOD FOR EXTRACTING AN OIL DEPOSIT WITH LOW PENETRABILITY TERRIGENOUS COLLECTOR Russian patent published in 2007 - IPC E21B43/20 

FIELD: oil industry, possible use during extraction of oil deposits with low penetrability terrigenous collector.

SUBSTANCE: during extraction of oil deposit with low penetrability terrigenous collector, working agent is forced in through force wells, oil is extracted through product wells, force well is periodically stopped, well is transferred to product mode and oil is extracted, well is stopped, transferred to force mode and working agent is forced in. After transfer of well to force mode, working agent is forced in with increasing forcing pressure until formation pickup decreased down to 10-20 m³/day. During stopping of well, technological exposure is performed until face pressure lowers down to its stabilization and watering cones fade in face-adjacent well zone and oil accumulates in well shaft. After transfer of well to product mode, oil is extracted until practically absolute water saturation of oil - up to 99,0-99,9% and decrease of face and formation pressures in well-adjacent zone, ensuring acceleration of formation of 50-60 m³/day during forcing of working agent.

EFFECT: increased oil recovery of oil deposit with low penetrability terrigenous collector.

2 cl, 1 ex