METHOD FOR DEVELOPING STEAM HORIZONTAL WELLS GIVING HIGH VISCOSITY OIL Russian patent published in 2018 - IPC E21B43/24 E21B47/00 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil industry and can be used in the development of a reservoir of high viscosity and bitumen oil. Method for developing paired horizontal wells producing high viscosity oil includes the construction of a horizontal production well and an injection well located above and parallel to the production well, creating a permeable zone between the wells by injecting water vapor into both wells. After the creation of the permeable zone, steam is supplied only to the horizontal injection well, and production is taken from the producing horizontal well. In the horizontal wellbore of the injection well, geophysical studies are conducted to determine the oil saturation along the horizontal trunk. After that, two columns of tubing are placed in the injection well. In this case, the end of a column of smaller diameter is located at the beginning of the horizontal barrel, and the end of a column of a larger diameter is in the zone with oil saturation of more than 60 %. For injection of steam in the production well, one or two tubing columns are placed with the end or ends horizontally displaced with respect to the ends of the tubing of the injection well by at least 10 m. In both wells a volume of steam is injected, determined by the given mathematical expression. After the completion of the injection of the calculated volume, the pair of wells is stopped for an endurance for thermocapillary impregnation and cooling of the wellbore, in which thermobarometric measurements are carried out by means of geophysical studies. Based on the results of which, in the horizontal wellbore of the producing well, transitional zones with a temperature between larger and smaller heating are identified. Among the identified zones, a zone is defined with a change in the angle of recruitment of curvature not more than 2 degrees by 10 m, in which the fiber optic cable and the electric centrifugal pump (ECP), descending on the tubing, equipped with temperature and pressure sensors, are placed on the tubing. Injection of steam through the injection well is resumed, and the selection of the ECP products is carried out with the removal of the thermogram along the wellbore through the fiber optic cable and the temperature measurement at the ECP receiver to control the process of uniform heating of the producing well. Moreover, when the temperature of the liquid is lowered below the maximum permissible pump inlet, the injection of steam through the injection well is increased, and when the temperature at the inlet of the ECP is increased, the injection of steam through the injection well is reduced and / or the ESP is transferred to the periodic mode of operation. After stabilizing the temperature at the input of the ECP, equal to the maximum permissible by the operating conditions, the pump is switched to a constant mode of operation.

EFFECT: reduction of energy costs through the use of single-well wells, elimination of uneven heating and vapor breakthrough into the production well due to the use of heating control and increase in operational reliability due to the use of submersible ECPs.

3 cl, 3 dwg