METHOD OF THERMAL IMPACT AT DEPOSIT OF HIGHLY VISCOUS OIL AND BITUMEN Russian patent published in 2009 - IPC E21B43/24 

FIELD: oil and gas production.

SUBSTANCE: invention is related to development of oil deposits, in particular to methods of thermal impact at deposit containing highly viscous oil. Method includes drilling of horizontal injection wells, drilling of producing horizontal well under each injection well within the limits of the same productive bed for bleeding of highly viscous oil and bitumen, pumping of coolant into horizontal wells. Rows of vertical production wells are drilled for extraction of highly viscous oil and bitumen. Between rows of vertical production wells within the limits of productive bed they drill rows of above mentioned horizontal wells. Highly viscous oil and bitumen are extracted from horizontal productive wells until coolant breaks through into vertical productive wells from horizontal injection wells. Afterwards coolant pumping into horizontal injection wells is stopped, and they are changed over to production wells, and horizontal production wells are changed to injection wells. Further when coolant breaks through from horizontal injection wells that were changed over earlier from production wells into vertical production wells, a reverse change over is done from horizontal injection wells into production wells, and horizontal production wells are changed into injection wells, and so the cycle is repeated until bed is exhausted.

EFFECT: increased thermal coverage of deposit.

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