METHOD FOR DEVELOPMENT OF HIGH-VISCOSITY OIL DEPOSIT WITH WATER-SATURATED ZONES Russian patent published in 2019 - IPC E21B43/24 E21B7/04 E21B33/138 

FIELD: oil and gas industry.

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, Formation is heated by pumping to both wells of hot working agent with specific weight below specific gravity of formation water, conducting investigations for determination of water-saturated zones adjacent to production well. After that, in the casing adjoining the water-saturated zones of this well, these zones are covered with water-proof composition destructing at external action, with subsequent process exposure, pumping of displacement agent into the injection well and product extraction from the 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 a production well by geophysical studies in two stages, the first of which is electric and / or radioactive – before the beginning of steam injection, and the second thermometric – after the formation is heated before the beginning of production. Upon detection of water-saturated zones, opened by horizontal shaft of production well on the side of wellhead, and determining extreme upper and lower boundaries of said zones before pumping and pumping into pore space of productive formation water-insulating composition closer to the bottom not less than 15 m relative to lower boundary of 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 (TS), the through 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 performed along tubing string at pressure not exceeding formation hydro-opening pressure. 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 there placed is a pump lowered on the tubing string below the depth of the water-insulating composition pumping interval for at least 50 m, after which the injection well is started for steam injection, and the production well is started for the product extraction.

EFFECT: expansion of functional capabilities due to stability of water-insulating composition at high temperatures of not less than 180 °C, high-quality insulation of water-saturated zones of the formation, reduced material costs.

1 cl, 3 dwg, 1 ex