PROCEDURE FOR DEVELOPMENT OF HEAVY OIL OR BITUMEN DEPOSIT Russian patent published in 2011 - IPC E21B43/24 

FIELD: oil and gas production.

SUBSTANCE: procedure consists in drilling vertical pressure wells and horizontal producers, in pumping heat carrier through pressure wells, and in withdrawal of production via horizontal producers. A double wellhead horizontal producer is drilled with implementation of one deflector near a bottom of the pay, while a vertical pressure well is drilled positioning bottomhole over a middle part of a horizontal section of the producer at distance avoiding breakthrough of heat carrier. The producer is provisionally divided into several zones with different temperature modes. While pumping heat carrier as far as the pay is being heated and at reaching maximum well product watering, withdrawal is started from a lower, the most heated zone. When temperature of product reaches 80-90 % of breakthrough temperature, withdrawal of product is transferred to zones of lower temperature; zones with high temperature close to breakthrough temperature are insulated with blind packers. If temperature rises in new zones of withdrawal, zones of withdrawal are transferred to colder zones cutting high temperature zones with blind packers. If temperature drops below a required value, zones of withdrawal are transferred to zones of higher temperatures below 70 % of breakthrough temperature.

EFFECT: raised oil production rate.

1 dwg, 1 ex