METHOD OF OIL DEPOSIT DEVELOPMENT Russian patent published in 2009 - IPC E21B43/24 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil and gas industry, particularly to development of oil deposits, notably for methods of development of viscous oil or bitumen at simultaneous-separate operation of producing and pressure horizontal boreholes of wells under thermal-steam formation treatment. According to the method horizontal well is bored and two horizontal boreholes are arranged in one vertical plane; viscous oil or bitumen are replaced by pumped heat carrier. In accordance with the invention extent of pay section of the formation in the deposit area is specified. Horizontal boreholes are arranged in the interval of the most permeable interlayer not less, than 6 m above the bottom of the viscous oil or bitumen formation, or water-bitumen contact and with distance between bottoms of holes not exceeding 5 m. Openings of the kickoff of horizontal boreholes are placed in an oil-saturated formation at the distance of 8-10 m one from another. Horizontal boreholes are bored along the ascending trajectory and are directed to the dome part of the deposit. Bottom of each borehole is set above the kickoff opening; then two pump-compressor pipes with centralisers are lowered. Pumping of a heat carrier is performed in cycles or continuously via the upper horizontal borehole maintaining pressure at the bottom near hydrostatic. Also withdrawal of viscous oil or bitumen is constantly carried out via the lower horizontal borehole.

EFFECT: increased yield owing to stable and continuous heat effect, increased efficiency of heat carrier, increased coverage by withdrawing deposits of viscous oil and bitumen as per area and profile also due to reduction of associated produced water and to reduction of condensate ratio in volume of withdrawn production.

1 ex, 1 dwg