METHOD OF COMPLETION AND DEVELOPMENT OF STEAM HORIZONTAL WELLS PRODUCING HIGH-VISCOSITY OIL Russian patent published in 2019 - IPC E21B43/24 E21B43/26 E21B7/04 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil-producing industry. Method for completion and development of steam horizontal wells producing high-viscosity oil includes construction of horizontal production well and injection well located above and parallel to production well, creation of permeable zone between wells due to delivery of heat carrier to both wells. After creating the permeable zone, steam is supplied only to the injection well, and production is selected from the production well. Horizontal production well during construction is equipped with fiber-optic cable with temperature sensors, and for creation of permeable zone to productive formation through both wells heat carrier is supplied with temperature of not less than 90 °C, but not higher than evaporation temperature in formation conditions, and pressure, which enables hydraulic fracturing of formation, but not higher than pressure of formation reservoir cover rupture, for 1 to 3 days. Then, steam is injected for injection of at least 4 t per running meter of horizontal wellbore of each well with further stopping for thermocapillary impregnation. At that, in the horizontal wellbore of the production well there performed are geophysical studies for detection of transition zones between larger and smaller heating, in which zone with change of angle of set of curvature of not more than 2 degrees per 10 m is selected for arrangement of the pump input lowered on the tubing string and equipped with pressure and temperature sensors at the inlet. Pumping of steam through injection well is resumed, and product extraction is performed by pump with thermogram removal along production well shaft and temperature measurement at pump intake. When the liquid temperature drops below the maximum permissible value at the pump inlet steam injection through the injector is increased. As the temperature increases at the pump inlet, steam injection through injection well is reduced and/or the pump is switched to periodic operation mode. After temperature stabilization at the level of maximum permissible pump is changed to normal operation mode.

EFFECT: faster development of wells, elimination of uneven heating and steam breakthrough to production well, higher reliability of operation, reduced power and material costs.

1 cl, 3 dwg, 1 ex