METHOD FOR DEVELOPMENT OF HIGH-VISCOSITY OIL OR BITUMEN FIELD USING VERTICAL WELLS Russian patent published in 2020 - IPC E21B43/24 E21B7/04 E21B47/04 E21B47/06 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil-producing industry. Method for development of high-viscosity oil or bitumen field includes construction steam of horizontal production and injection wells located one above the other, as well as vertical observation wells, pumping of heat carrier through injection wells with heating of productive formation and creation of steam chamber, product extraction due to steam-gravity drainage through production wells and control over steam chamber condition, adjustment of steam chamber current size by changing volumes of heat carrier pumping to injection wells and extraction of liquid from production wells with volume control of steam chamber. Prior to construction of horizontal production and injection wells, vertical evaluation wells are drilled to delineate oil-saturated deposit and estimate potential of industrial development of deposit. Based on results of geophysical analysis and core analysis of vertical evaluation wells, structural maps of oil-saturated thicknesses over the deposit are constructed, then vertical evaluation wells are eliminated. After pumping of heat carrier through horizontal injection wells with heating of productive formation and creation of steam chamber, thermo-barometric measurements are carried out by means of geophysical investigations, thermograms are taken along the boreholes of horizontal production wells by means of fiber-optic cable, horizontal production and injection wells are brought to constant mode. Temperature monitoring is periodically performed in vertical observation wells by geophysical investigations. Vertical observation wells are detected with temperature increase in the shaft at not less than 10 % of the initial reservoir temperature and not more than 60 °C, tests are carried out to determine influx and composition of liquid by compression. That is followed by performing the liquid level recovery curve. Allocate vertical observation wells, which is obtained when compressing fluid influx is not less than 0.4 m³, the liquid level restoration occurs in well for 48 hours and net pay thickness is not less than 5 m. Selected vertical observation wells are arranged and started to be used for fluid extraction.

EFFECT: increased coverage of formation by impact, additional oil production due to operation of undrained sections of oil-saturated formation with simultaneous reduction of specific costs.

1 cl, 1 ex