Alkaline-Surfactant-Polymer (ASP) Flooding System
Alkaline-Surfactant-Polymer (ASP) flooding is a combined EOR chemical system that synergizes alkali (sodium carbonate or sodium hydroxide), surfactant, and polymer to maximize oil displacement and sweep efficiency in mature waterflooded reservoirs. The alkali reacts with crude oil acidic components to generate in-situ surfactants, reducing the required dosage of injected surfactant by 30–50%. Widely deployed in major Chinese oilfields (Daqing, Shengli) with incremental recovery of 15–20% OOIP.
Technical Specifications
| alkali component | Na₂CO₃ or NaOH (0.8–1.5 wt%) |
| polymer component | HPAM (1200–1800 ppm) |
| IFT of system (mN/m) | ≤10⁻² |
| surfactant component | Petroleum sulfonate or betaine-based |
| viscosity of ASP slug (mPa·s) | 10–30 |
Applications
- Mature waterflood reservoir EOR
- High-acid-number crude oil ASP flooding
- Large-scale pattern flooding in sandstone reservoirs
- Combined EOR with polymer for mobility control
- Daqing and Shengli oilfield type formations
Key Features
- In-situ surfactant generation by alkali reduces surfactant dosage
- Synergistic EOR — IFT reduction + mobility control + wettability alteration
- Field-proven in Daqing and Shengli oilfields with 15–20% OOIP recovery
- Customizable for specific crude oil acid number and reservoir salinity
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