DEVELOPMENT METHOD OF DEPOSIT OF HIGH-VISCOSITY AND HEAVY CRUDE OIL WITH THERMAL IMPACT Russian patent published in 2012 - IPC E21B43/24 

FIELD: oil and gas industry.

SUBSTANCE: in development method of deposit of high-viscosity and heavy crude oil with thermal impact, which involves drilling of rows of vertical production and injection wells, construction of wells with horizontal sections, pumping of heat carrier to injection wells and extraction of product from production wells, rows of wells are drilled according to five-point pattern. Horizontal sections are drilled from the wells located in corners of the pattern around central vertical well located in the middle in the direction towards the nearest corners so that horizontal sections of the wells located in the nearest corners of the pattern are located near each other at the distance of 5-10 m, and covered longwise through 30-50 m. Horizontal sections of wells are located in the following way: one - above horizontal section of the well located in one nearest corner of the pattern, and the other one - under horizontal section of the well located in the other nearest corner of the pattern. Horizontal sections of the wells located in opposite corners from central well are drilled on one and the same level. Horizontal sections of wells, which are located below, and central well is used as injection one, and horizontal well sections located above - as production ones. After the formation is warmed up to 60-70°C through 50-60 m from horizontal injection sections, which is determined by the control of temperature of the product extracted from central well from time to time, wells with horizontal sections, which are located around this central well, are changed over to production wells.

EFFECT: enlarging the coverage area of thermal impact on high-viscosity and heavy crude oil deposit; increasing the volumes of extraction of warmed-up high-viscosity and heavy crude oil from the deposit owing to changing over all horizontal sections to extraction of warmed-up high-viscosity oil from the deposit.

3 dwg