PROCEDURE FOR DEVELOPMENT OF HIGH VISCOUS AND HEAVY OIL DEPOSIT BY THERMAL TREATMENT Russian patent published in 2011 - IPC E21B43/24 

FIELD: oil and gas production.

SUBSTANCE: procedure for development of high viscous and heavy oil deposit by thermal treatment consists in drilling horizontal pressure wells and producers, in pumping heat carrier into pressure wells and in withdrawal of high viscous and heavy oil from producers. Horizontal producers are drilled from two sides in the direction to a horizontal pressure well in the same interval and further; offshoots parallel to the horizontal pressure well and at step of 50-400 m from it are drilled from horizontal, differently directed sections. Secondary opening in the pressure well is performed on two sections positioned opposite to differently directed boreholes of the producer. If product - high viscous and heavy oil of one of the producers - is watered above allowed level, withdrawal from it is stopped and there are made analysis of production of each offshoots of this well separately, successively cutting them starting from the nearest one to the pressure well and withdrawing product for analysis. The most watered offshoot is treated with backfilling composition to exclude water intake from it where upon the producer is put into operation under a normal mode.

EFFECT: extended range of heat treatment of deposit and reduced watering.

3 dwg