HIGH VISCOUS OIL PRODUCTION METHOD Russian patent published in 1995 - IPC

FIELD: oil deposits development. SUBSTANCE: method provides for drilling in oil devilment site center of vertical pumping-in boreholes, along which horizontal production boreholes are located. along horizontal hole they drill vertical production boreholes, from which a part of boreholes is located near horizontal hole and even up to crossing it. The rest are spaced from horizontal hole by 3 20 meters, measuring from the boreholes bottoms. Steam is pumped in inject vertical boreholes and vertical production boreholes. Simultaneously oil is extracted from production oils. After steam penetrates vertical production boreholes steam pumping-in is stopped and oil extraction is continued. Boreholes after steam pumping-in is stopped and pressure at their wellheads is decreased are also used to extract oil. The boreholes produce oil, that flows to horizontal holes. In case temperature and boreholes oil production rate dropped the next cycle of steam pumping-in is exercised. After temperature in production boreholes bottom zone stabilized at 60 80 C periodical steam pumping-in boreholes is stopped and the borehole are further used for oil production. EFFECT: increased oil production. 1 dwg