DEVICE FOR DEVELOPMENT OF DEPOSIT OF HIGH-VISCOSITY OIL OR BITUMEN Russian patent published in 2013 - IPC E21B43/24 

FIELD: oil and gas industry.

SUBSTANCE: device for development of an oil or bitumen high-viscosity deposit involves (within a deposit) a two-head well with a horizontal section cased with a production string with a filter on both ends, and an additional shaft fixed with an additional production string with a filter, a pump for extraction of the well product, which is lowered on a process pipe string through the first head of the well, and a process pipe string for injection of heat carrier, which is lowered through the second head of the well. The filter in the additional production string of the additional horizontal shaft is arranged under the filter of the production string of horizontal section of the two-head well at the distance excluding the heat carrier breakthrough. In the production string, on the side of the additional horizontal shaft before the filter there installed is a blind packer, and the pump is arranged in the two-head well on the side of the first head interconnected with the additional horizontal section. On the side of the second head, two process pipe strings with packers on the end are lowered and arranged concentrically; the packers are set in a non-perforated section of the filter of the production string at the boundary of the deposit zones differing with permeabilities by two and more times. The filter of the production string is separated with packers of the process pipe strings into zones with high and low permeabilities. On the second head of the two-head well, each process pipe string is equipped with a pair of valves connected with injection lines with a steam generator plant and a pumping unit. The injection line connected to the process pipe string supplying the heat carrier to the high-permeability zone is equipped with a nozzle.

EFFECT: extension of the deposit development till breakthrough of heat carrier at the pump inlet, uniform pumping of heat carrier throughout the filter length depending on the deposit permeability and pressure of intake capacity of the pumping zones, increase in extraction efficiency of heated high-viscosity oil or bitumen, and isolation of the deposit section at heat carrier breakthrough.

1 dwg