Laboratory investigation of combination of alkali/surfactant/polymer technology for Daqing EOR
- Inst. of Petroleum Exploration and Development, Daqing (China)
Alkali/surfactant/polymer (ASP) formulas were developed for the Daqing oil field, Peoples Republic of China, with two surfactants from the US (Petrostep B-100 and a blend of TRS-18 and TRS-40) and one Chinese surfactant (PS-D{sub 2}). Each ASP solution gave interfacial tension (IFT) values in the range of 1 {times} 10{sup {minus}3} mN/m. Rheologic studies with polyacrylamide polymers indicate that solution viscosity decreases with alkali addition, as does the pseudoplasticity of the solution. Addition of surfactant to the alkali/polymer solution increases the solution viscosity with no slope change in the viscosity-vs.-shear-rate plot. Incremental oil recovery was higher than that with waterflood; 20% original oil in place (OOIP) for 0.2-PV ASP injection and 33% OOIP for 0.3-PV ASP injection in Daqing core. Surfactant and alkali retention were both < 1 mg/g sand. The positive results of this laboratory study provided a fluid formula for a pilot ASP flood in the Daqing oil field.
- OSTI ID:
- 87564
- Journal Information:
- SPE Reservoir Engineering, Vol. 10, Issue 3; Other Information: PBD: Aug 1995
- Country of Publication:
- United States
- Language:
- English
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