DEVELOPMENT METHOD OF HIGH-VISCOSITY OIL DEPOSIT USING WELLS WITH INCLINED SECTIONS Russian patent published in 2012 - IPC E21B43/24 

FIELD: oil and gas industry.

SUBSTANCE: development method of high-viscosity oil deposit using wells with inclined sections involves well drilling, arrangement of tubing string in each well, pumping of heat carrier, heating of productive formation with creation of steam chamber by pumping of heat carrier spread to upper part of productive formation with increase in steam chamber dimensions, reduction of viscosity of high-viscosity oil, extraction of products from the well via tubing string and monitoring of process parameters of productive formation and well during product extraction, periodic determination of mineral content of incidentally extracted water, analysis of effect of the mineral content change of incidentally extracted water on uniform heating of steam chamber, and considering the change of mineral content of incidentally extracted water, implementation of uniform heating of steam chamber by controlling the heat carrier pumping mode or well product extraction mode till stable mineral content value of extracted water is achieved. At least two wells with inclined sections are drilled in productive formation; at that, inclined sections of wells are drilled in two vertical planes located at the distance of 1-2 metres from each other and opposite each other with approximation of sections to middle points of each section and with their further withdrawal. Each inclined section is divided into two productive formation opening intervals by installing the packer lowered to the well as a part of tubing string, and ends of tubing strings are located on ends of inclined sections; at that, each tubing string is equipped with extracting pump of heated viscous oil. Heat carrier is periodically pumped to upper productive formation opening intervals, and product is constantly extracted from lower productive formation opening intervals.

EFFECT: increasing the coverage area of deposit heating, increasing the extraction volume of heated high-viscosity oil due to gradual increase of total volume of steam chamber during development; reduction of material and financial costs.

2 dwg