METHOD OF INCREASING OIL RECOVERY FROM FORMATION Russian patent published in 2002 - IPC

FIELD: oil production with use of heat, mainly, from reservoirs with heavy, bitumen oil, in complex with drilling of horizontal wells. SUBSTANCE: method includes installation of perforated casing string into horizontal well, cementing of casing-borehole annulus up to horizontal borehole; installation of tubing string into perforated casing string up to its horizontal part; installation into tubing string of the second tubing string up to end of casing string horizontal part; supply of gas to well through annular space between casing string and the first tubing string; supply of heat carrier through the second tubing string to end part of casing string; withdrawal of well product through annular space between the first and second tubing strings up to attaining of preset injectivity. After provision of required injectivity, withdrawal of products from given well is discontinued. Annular space between the first and second tubing strings is filled with gas. Products are withdrawal from neighboring producing wells. EFFECT: provision of preset injectivity of heat carrier with reduced losses of its energy. 2 dwg