摘要: A commercial scale micellar-polymer project was conducted in the Robinson Sand of the M-1 project in southwestern Illinois. The project utilized a crude oil sulfonate surfactant system to flood the reservoir which, at the time of ... 展开 A commercial scale micellar-polymer project was conducted in the Robinson Sand of the M-1 project in southwestern Illinois. The project utilized a crude oil sulfonate surfactant system to flood the reservoir which, at the time of the project, was in an advanced stage of waterflood depletion. Injected fluids consisted of a 0.10 pore volume crude oil sulfonate slug, a 1.05 pore volume graded mobility slug using Dow Pusher 700, and a drive water slug to depletion. Micellar injection started in 1977. By December, 1986, overall operations in the 2.5-acre pattern area were uneconomical while polymer injection was continuing in the 5.0-acre pattern area. Depletion of the 5.0-acre pattern area is forecast for 1991 or sooner. Ultimate oil recovery is estimated at 1,397,000 barrels with cumulative oil recovery at December, 1986, of 1,299,000 barrels. Although the crude oil sulfonate system successfully mobilized and produced waterflood residual oil, the project was not economic because of both lower than anticipated recovery and higher than expected operating costs. The lower than anticipated recovery is attributed to poor volumetric sweep efficiency and salinity/hardness effects. 7 refs., 54 figs., 25 tabs. (ERA citation 14:012568) 收起