METHOD FOR DEVELOPING A LOW-PERMEABILITY RESERVOIR OF AN OIL DEPOSIT Russian patent published in 2022 - IPC E21B43/20 

FIELD: oil fields development.

SUBSTANCE: invention relates to the field of development of oil fields of complex geological structure with heterogeneous, including low-permeability reservoirs and improves the efficiency of oil production from productive deposits with hard-to-recover oil reserves. The method includes separating a low-permeability reservoir with the characteristics of reservoir oil with a gas content of at least 20 m³/t, a saturation pressure of at least 80% of the initial reservoir pressure, an oil viscosity of not more than 30 MPa*s; of the corresponding series of the design grid of production wells. The correction factor Fcor is determined for each circular zone, starting from the outermost circular zone towards the top of the oil deposit structure. In this case, the correction factor Fcor of the most remote circular zone from the arch of the reservoir structure is equal to one, then the minimum bottom hole pressure is calculated for production wells located in each circular zone. After comparing the absolute marks of the formation roof between adjacent production wells, if they do not match and the arch of the deposit structure is shifted relative to the design one, the location of the circular zones is corrected with the redistribution of the design production wells over the circular zones, the correction factor Fcor and the minimum bottom hole pressure Ph for each circular zone are corrected, production wells are commissioned into operation with drawdowns in the bottom hole zone reaching the calculated minimum bottom hole pressures Ph. Further, during the operation period, simultaneously once a year in each circular zone, the reservoir pressure is measured in production wells located along a straight line passing through the arch of the deposit and the bottom of the production well located in the most remote circular zone, at reservoir pressure greater than or equal to saturation pressure in the production well located in the outermost circular zone, the production wells are operated in the same set mode, and at reservoir pressure below the saturation pressure in the production well located in the outermost circular zone, all production wells located in the outermost circular zone are removed from operation, at the same time, the correction factor Fcor is equated to the unit of the circular zone next in distance from the arch of the structure of the oil deposit and the correction factors of the remaining circular zones and the minimum bottom hole pressures are recalculated.

EFFECT: improving the efficiency of development and maintaining high rates of oil reserves recovery in low-permeability reservoirs.

1 cl, 1 dwg