PROCESS OF OIL RESERVOIR DEVELOPMENT Russian patent published in 2008 - IPC E21B43/16 

FIELD: mining.

SUBSTANCE: process involves drilling of production and injection wells, injection of gas and water into injection wells and hydrocarbon recovery from production wells. At the first stage oil and gas mix is recovered from the central and marginal injection wells due to the stratum energy at bottom hole pressure close to saturation pressure but not reaching it, till the current stratum pressure exceeds saturation pressure by 5.0-10.0 MPa. Then gas in pumped into injection wells at the pressure exceeding saturation pressure by 10.0-15.0 MPa. Oil and gas are recovered from production wells at bottom hole pressure not less than saturation pressure, until gas factor gain exceeds original gas factor by 2-3 times but not more than 1000 m per ton of recovered oil. Next stage involves multiple injection of gas and water into each injection well by turns. At that, in each injection period gas and water volume is injected in reservoir conditions at the general volume ratio related to the minimal correlation of physical properties of oil and displacement agent. Each transit from gas to water injection is made together with the gas factor gain not more than by 1000 m³ per ton of recovered oil, and each transit from water to gas injection is made together with gas factor reaching original value or its vicinity. At the final stage water is injected until gas rim disappears and water content in the production well recovery reaches 0.9 and more, depending on the well profitability.

EFFECT: reservoir development in several stages.

2 cl, 3 tbl, 1 dwg