METHOD FOR THERMAL MINE DEVELOPMENT OF HIGHLY-VISCOUS OIL FIELD BY WITH BRANCHED WELLS Russian patent published in 2006 - IPC E21B43/24 

FIELD: oil industry, particularly enhanced recovery methods for obtaining hydrocarbons with the use of heat.

SUBSTANCE: method involves forming mine gallery in oil field zone at oil reservoir bottom or under the bottom; frilling surface injection wells along the zone; drilling gently sloping and/or horizontal branched steam-distribution wells from mine gallery, wherein main bores of branched steam-distribution wells cross surface injection wells or extend through area of injection well influence and side branches thereof provide high coverage of reservoir zones remote from mine gallery with heat applied thereto; boring underground gently sloping and/or horizontal branched producing wells between branched steam-distribution ones; injecting steam in oil reservoir through surface injection wells; distributing steam through oil reservoir with the use of underground branched steam-distribution wells; producing oil through underground producing wells. In periods characterized by absence of stream breakthrough into branched steam-distribution wells the wells are used as producing ones. Heads of branched steam-distribution and producing wells are cased with heat-insulated casing pipes.

EFFECT: decreased time of oil field or oil field zone development along with thermal conditions retention in mine gallery.

1 ex, 1 dwg