METHOD OF OIL AND GAS CONDENSATE FIELD DEVELOPMENT Russian patent published in 2012 - IPC E21B43/24 

FIELD: gas and oil production.

SUBSTANCE: method of oil and gas condensate field development involves well drilling in viscous oil bed with horizontal wellbores, heat carrier injection, and viscous oil extraction. Viscous oil bed id reamed with additional wells with horizontal wellbores. A part of horizontal wellbores in all wells is positioned in a plane by 0.5-1 m higher than oil and gas interface (OGF) and used as injection wells. The other part is made in a plane by 0.5-1 m lower than water and oil interface and used as production wells. Length of horizontal wellbores lies within 50-1000 m, and distance between horizontal wellbores lies within 100-500 m. Bed water is produced in water intake well of the field and used to prepare heat carrier which is injected into the bed first as reheated steam in volume sufficient to form condensed bed water layer of 1.5-2.5 m depth above OGF, then as polymer solution in bed water heated to 90 - 95°C. Heated polymer solution is injected into the bed in volume sufficient to heat viscous oil to the temperature where oil viscosity falls to 1/3 of initial value of bed oil viscosity or less. Viscous oil production is performed in production wells with injection of heater polymer solution running. Supply of heated polymer solution is stopped when polymer solution layer in the OGF reaches 15% of the bed zone volume through which it is injected into the bed.

EFFECT: increased efficiency of viscous oil production due to extended area and section coverage of oil-saturated bed area.

3 dwg, 1 ex