METHOD FOR DEVELOPMENT OF HIGH-VISCOSITY OIL DEPOSIT WITH WATER-SATURATED ZONES Russian patent published in 2020 - IPC E21B43/24 E21B7/04 E21B33/138 E21B47/06 E21B49/00 

FIELD: oil, gas and coke-chemical industries.

SUBSTANCE: invention relates to the oil-producing industry. Method of developing a reservoir of high-viscosity oil with water-saturated zones includes the construction of horizontal production and higher injection wells with the installation of casing strings with filter parts in the corresponding horizontal sections, heating the reservoir by injection into both wells of a hot working agent with a specific weight below the specific gravity of the reservoir water, conducting studies to determine water-saturated zones adjacent to the production well, after that in casing adjacent to water-saturated zones of this well, these zones are covered with water-insulating compound destructing at external action, with subsequent process exposure, pumping of displacement agent into injection well and withdrawal of product from production well. Waterproofing composition used is heat-resistant gel composition, and displacing agent - steam with temperature of not less than 180 °C. Determination of water-saturated zones is carried out in the production well by geophysical studies in two stages, the first of which is electric and/or radioactive - before the beginning of steam injection, and second thermometric - after the formation is heated before production begins. Upon detection of water-saturated zones, opened by horizontal shaft of production well on the side of wellhead, and determination of extreme upper and lower boundaries of these zones before pumping and forcing into the porous space of the productive formation water-insulating composition closer to the bottom not less than 15 m relative to the lower boundary of the water-saturated zone, a blind drilled packer is installed. Then, closer to the mouth at least 15 m relative to the upper boundary of the water-saturated zone on the tubing string, a passable detachable packer is lowered and installed with an outlet into the inter-packer space by at least 3 meters from the detachable packer. Pumping of water-insulating compound is carried out along the tubing string at pressure not exceeding the pressure of hydraulic fracturing of the formation. After the process exposure, the detachable packer is removed together with the tubing string, and the blind packer is drilled together with water-proof composition left in the well shaft. After that, in the production well, the pump running in the tubing is placed below the depth of the water-insulating composition pumping interval by at least 50 m. After that, injection well is started for steam pumping, and producer - for product extraction.

EFFECT: technical result is high-quality insulation of water-saturated zones of formation, concentration of depression created by pump in production well, in oil sections of horizontal shaft, creation of local hydrodynamic connection between horizontal production and located above injection wells in zone of toe and expansion along bores of wells with simultaneous reduction of material costs in operation.

1 cl, 3 dwg, 1 ex