METHOD OF HIGH-VISCOSITY OIL DEVELOPMENT Russian patent published in 2012 - IPC E21B43/24 

FIELD: gas and oil production.

SUBSTANCE: method of high viscous oil deposit development involves construction of double-mouth horizontal production well and vertical well near horizontal well bottomhole. Additionally two rows of vertical evaluation wells at each of two sides of horizontal production well in a grid pattern with 40-50 m pitch and half-pitch horizontal shift and one evaluation well near mouth of double-mouth horizontal well are made. Then double-mouth horizontal well is divided into 60-100 m sections with injection wells positioned in their middle at one or two sides in 20-30 m from the wellbore of horizontal production well. Combustion is initiated from injection wells, and product is extracted from double-mouth horizontal well. The rest of evaluation wells are converted into production wells together with the well near bottomhole, monitoring combustion front by products extracted from evaluation wells. If temperature falls below permissible viscosity point, evaluation wells of closer row are converted into injection wells for combustion initiation. After burning initiation, it is blocked before burning completion. After product temperature fall in these wells to a sufficient level for bed product extraction, the evaluation wells are converted into production wells.

EFFECT: increased degree of high viscous oil extraction.

1 dwg