PRODUCTION METHOD OF HIGH-VISCOUS OIL BY MEANS OF SIMULTANEOUS PUMPING OF STEAM AND EXTRACTION OF LIQUID FROM SINGLE HORIZONTAL WELL Russian patent published in 2012 - IPC E21B43/24 

FIELD: oil and gas industry.

SUBSTANCE: method involves installation of casing string, cementing of annular space above horizontal section in which perforation is made in end part and at the beginning of horizontal section, lowering of tubing string with installation of packer between perforated sections, steam pumping to formation and liquid extraction from formation. Prior to tubing string lowering to the well there lowered is protective string to horizontal section, into which there lowered is tubing string with pump arranged in lower part of productive string and allowing to perform the steam pumping to formation through it. First, steam is pumped to formation through the space between productive string and tubing string, as well as via tubing string through pump. Total volume of pumped steam is 5-7 t/m of total length of perforated sections. After that, pumping is continued via the space between productive string and tubing string. Liquid is extracted by means of a pump via tubing string.

EFFECT: reducing material and power consumptions; increasing well flow rate.

1 dwg