METHOD FOR DEVELOPING PAIRED HORIZONTAL WELLS PRODUCING HIGH-VISCOSITY OIL Russian patent published in 2022 - IPC E21B43/24 

FIELD: oil industry.

SUBSTANCE: invention relates to the oil industry and can be used in the development of paired horizontal wells producing high-viscosity oil. The claimed method for the development of paired horizontal wells producing high-viscosity oil consists in the fact that before the construction of horizontal wells, the productive formation is drilled with a square grid of vertical appraisal wells with a distance between wells of 200 m in plan. Core sampling and geophysical studies of appraisal vertical wells are carried out, then a unified geological model of the productive formation of the deposit is built. Further, data are obtained on the distribution of permeability coefficients, net-to-gross ratio, clay content, thicknesses of the productive formation. When sampling the product, the temperature of the produced product is controlled on the wellhead mass meter and the oil flow rate is controlled by periodic sampling from a horizontal production well. When the temperature of the produced product is less than 30°C for three months and when the temperature of the produced product drops by 10°C or more per month for three months in a row, and a injection wells to obtain the distribution of coefficients of permeability, net-to-gross ratio, clay content of the formation along horizontal wells. At the same time, the cell size of the detailed geological model is chosen 10 times less compared to the unified geological model, then the pumping equipment is raised and one or two tubing strings are lowered with the end or ends at the beginning and at the end of the horizontal wellbore in the zone or zones with the highest value coefficients of permeability and net-to-gross ratio and the lowest value of the coefficient of clay content. Next, steam injection into horizontal production and injection wells is resumed in a volume exceeding the previous volume of injected steam by 25%. Then the horizontal production and injection wells are stopped for soaking for thermocapillary impregnation and cooling of the horizontal production wellbore. In a horizontal production well, thermobarometric measurements are carried out, the results of which reveal a zone with a maximum temperature, in this zone a pump is installed on the tubing string, equipped at the intake with temperature and pressure sensors, and a fiber optic cable is installed along the entire length of the horizontal wellbore. Next, the steam injection is resumed through the horizontal injection well in the same daily volume, and the product is withdrawn by the pump with the removal of a thermogram along the horizontal production wellbore by means of a fiber optic cable and the temperature is measured at the pump intake and on the wellhead mass meter to control the process of uniform heating of the horizontal production well. When taking products, the temperature of the produced product is controlled on the wellhead mass meter and the oil flow rate by periodic sampling from a horizontal production well, at a temperature of the produced product less than 30°C for three months and with a decrease in the temperature of the produced product by 10°C or more per month for three months in a row, and a simultaneous drop in oil production, pumping equipment is raised and one or two tubing strings are lowered with the end or ends at the beginning and at the end of the horizontal wellbore of the production well, without changing the location area. Further, the operations of injecting into horizontal production and injection wells a volume of steam that exceeds the previous injected volume by 25%, and determining the temperature of the produced product and oil flow rate are repeated, the development is continued until the volume of injected steam is reached, which exceeds the initial injected volume by 200%.

EFFECT: increasing the efficiency of developing high-viscosity oil by creating a high-quality thermohydrodynamic connection between paired horizontal wells located in different geological, physical and lithological conditions in a productive reservoir, involving previously non-drained sections of an oil-saturated reservoir in the development and increasing the final oil recovery factor in the extraction zone of a pair of wells.

1 cl, 2 dwg