METHOD OF DEVELOPMENT OF STRATIFIED OIL DEPOSIT WITH HIGH-VISCOSITY OIL Russian patent published in 2015 - IPC E21B43/24 

FIELD: oil and gas industry.

SUBSTANCE: method of development of stratified oil deposits with high-viscosity oil includes the deposit drilling according to row pattern with vertical production and injection wells, uncapping by wells of all oil saturated interstratified layers, use of the equipment for simultaneous and separate production and injection - ORD/Z, working agent injection into injection wells and withdrawal of production from production wells. The deposit with maximum quantity of oil saturated interstratified layers as ten is selected, at the external boundary of the deposit the injection wells are drilled, within internal border - production wells, and in intermediate - the wells fitted with ORD/Z. In the wells with ORD/Z the injection is performed by the interstratified layer that is met first at passing the deposit in the direction from boundary towards its centre, and the production - for all rest. Wells are drilled with the spacing interval between wellbores from 150 m to 300 m. The working agent after putting of the well into operation for injection is the gas heated in the wellhead up to the temperature 400°C maximum which is injected at the flow rate from 50 up to 500 m³/day per well and within the time until according to preliminary hydrodynamic modelling the thermal front passes the distance no less than 0.3 of the distance to the next production well. Then the content of share of water in the injected working agent without heating is increased linearly up to 100% within 5-30 days and then this water is injected. At decrease of formation pressure in the zone of withdrawal of production wells during the development by more than 20% from the initial one the withdrawal of liquid and water injection are adjusted so that the formation pressure to be within 80-120% of the initial one.

EFFECT: oil deposit recovery increase.

2 ex, 2 dwg