METHOD FOR DEVELOPING SUPERVISCOUS OIL DEPOSITS Russian patent published in 2023 - IPC E21B43/24 

FIELD: oil industry.

SUBSTANCE: development of high-viscosity oil or bitumen deposits under thermal exposure to horizontal wells. The method for developing a super-viscous oil deposit includes the construction of appraisal vertical wells on a square grid with a distance between wells of 200 m in plan, sampling of cores and geophysical studies of appraisal vertical wells, building a unified geological model of the productive formation based on the obtained data and obtaining data on the distribution of porosity and permeability coefficients and oil-saturated thicknesses. Next, a structural map of the oil-saturated thicknesses of the productive formation is constructed, the contour of the productive formation is identified along an isopach of 10 m, horizontal pairs of production and injection wells located above each other are designed and built with a mutually perpendicular arrangement of a pair of horizontal production and injection wells. The coolant is pumped through injection wells with heating of the productive formation and creating a steam chamber, and the production is taken through steam-gravity drainage through production wells and the condition of the steam chamber is monitored. The development of super-viscous oil deposits is carried out by regulating the current size of the steam chamber by changing the volume of coolant injection into injection wells and withdrawing fluid from production wells while controlling the volume of the steam chamber. When designing, the distance from the bottom of production wells to the bore of a perpendicular production well is selected depending on the average porosity of the productive part of the formation. When the production well bottom is located at a distance of 50-75 m from the perpendicular wellbore, initial heating is carried out by pumping steam in a volume of 50 tons/day for 70 days, followed by thermocapillary impregnation for 30 days, and when the production well bottom is located at a distance of 76-100 m from the perpendicular wellbore, initial heating is carried out by pumping steam in a volume of 80 tons/day for 50 days, followed by thermocapillary impregnation for 15 days. After that, steam injection into injection wells is resumed and products are taken from production wells, monitoring the state of the withdrawn fluid and regulating the rate of liquid withdrawal and coolant injection based on temperature and water cut data.

EFFECT: increased efficiency of development of superviscous oil deposits.

1 cl, 2 dwg