METHOD OF HIGH-VISCOSITY OIL DEVELOPMENT Russian patent published in 2011 - IPC E21B43/243 

FIELD: oil and gas production.

SUBSTANCE: method involves horizontal and vertical producer construction at a bottomhole of a horizontal oxidiser injector, burning initiation through the vertical well and production selection through the horizontal well. From both sides from the centre of the horizontal portion, a vertical evaluation well is drilled; thereafter in the vertical well arranged in the centre of the horizontal hole of the horizontal producer, burning is initiated, and products are selected from the horizontal well. The other evaluation wells are transformed into producers with monitoring a flame front by the selected products; if observing temperature fall with viscosity higher than an accepted value, the evaluation well is transformed into the injector of a burning initiator - an oxidiser. After burning initiation, it is blocked before burning completion. After product temperature fall in this well to a sufficient value for product selection, this evaluation well is transformed into the producer. If observing temperature rise more than maximum profitability, the evaluation well is transformed into the injector of a flame-resistant agent - water, steam, nitrogen.

EFFECT: higher oil recovery by wider formation coverage by an exposure agent due to consecutive formation processing with maintenance of high permeability.

1 dwg