METHOD FOR FURTHER DEVELOPMENT OF BOTTOM WATER-DRIVE RESERVOIR WITH LOW PRESSURE GAS RESERVES Russian patent published in 2016 - IPC E21B43/20 E21B7/04 

FIELD: gas industry.

SUBSTANCE: invention relates to gas industry and is linked to problem of providing effective further development of floating deposits with residual reserves of low-pressure gas. In particular, invention is required for largest gas deposits in Cenomanian deposits at deposits in North Western Siberia region, residual reserves of low-pressure gas in which is estimated at several trillions of cubic metres. Method comprises continuing development of deposit based on of drilled vertical production wells. Compressing gas for delivery into main gas line and implemented a system of technical and process solutions, in accordance with which is one or more horizontal wells are drilled for extraction of water from intervals below current gas-water contact level -WGC and above its initial level within zone of complex gas preparation installation - UKPG, where coning results in water inflow into producing vertical wells. In peripheral zones, outside zones of drilling UKPG, one or more horizontal injection wells are drilled for water injection into intervals below current WGC mark. Providing displacement slow-moving peripheral low-pressure gas towards production of vertical wells. To maintain gas production level beyond zones of drilling UKPG, one or more horizontal production wells with guide shaft in upper part of producing formation closer to roof are drilled. In continuation of advance of bottom water movement to faces of vertical production wells in high-priority candidate wells for irrigation perforation intervals are reduced by 5-10 m due to cementing of their lower part.

EFFECT: technical result is increased efficiency of method by taking into account features of development of water drive mode during further development of bottom water-drive reservoir with low pressure gas reserves and possibility of action on it.

3 cl, 3 dwg