METHOD FOR DEVELOPING HIGH-VISCOSITY OR BITUMINOUS OIL DEPOSITS USING PAIRED HORIZONTAL WELLS Russian patent published in 2022 - IPC E21B43/24 

FIELD: oil industry.

SUBSTANCE: invention relates to a method for developing a high-viscosity or bituminous oil deposit using paired horizontal wells. A productive formation is drilled with a triangular grid of appraisal vertical wells with a distance between wells of 200 m in plan. Core sampling and geophysical studies of appraisal wells are carried out. Get a geological model of the reservoir. According to the model, data on the distributions of the permeability coefficients and the compartmentation of the productive formation are obtained. The construction of horizontal production and injection wells is carried out. Two strings of tubing of different diameters are lowered into the injection well. The ends of the tubing are placed in different intervals of the horizontal wellbore. One or two tubing strings are lowered into the production well. Steam is pumped into the injection and production wells. Wells are stopped for holding. Geophysical surveys are carried out in a production well. Transitional zones with temperature between greater and lesser heating in the production wellbore are identified. Pumping equipment is installed in the production well. The injection of steam into the injection well is resumed. The selection of products is carried out with the registration of the thermogram of the production wellbore, with the measurement of the temperature at the pump intake and wellhead. When the temperature of the produced product at the wellhead is less than 30°C for three months or when the temperature drops by 10°C or more per month for three months in a row, as well as when the oil productivity drops, a detailed geological model of the reservoir area is obtained. The pumping equipment is raised. One or two tubing strings are lowered with the end or ends in the first and second halves of the production wellbore in the zone or zones with the highest permeability coefficient and the lowest dissection coefficient. Resuming the injection of steam into the production and injection wells in a volume less than 20% of the previous volume. The wells are stopped for holding. In the production well, thermobarometric measurements are carried out, the zone with the maximum temperature is identified. A pump is installed in this zone. Resuming the injection of steam into the injection well in the same volume. When selecting products, the temperature of the produced products at the wellhead is controlled. When the temperature of the produced product at the wellhead is less than 30°C for three months or when the temperature drops by 10°C or more per month for three consecutive months, as well as when the oil productivity drops, the pump is raised. One or two tubing strings are lowered with the end or ends in the first and second halves of the production wellbore, without changing the location area. The operations are repeated, starting with the resumption of steam injection into the wells in a volume less than 20% of the previous volume.

EFFECT: increasing the efficiency of reservoir development, creating a stable thermohydrodynamic connection between paired horizontal wells, directional impact on the productive formation, the possibility of oil production from previously non-drained areas of the oil-saturated formation, increasing the final oil recovery factor.

1 cl, 3 dwg