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Product Role in Mature Waterfloods
In mature oilfields, long-term waterflooding often leads to channeling, early water breakthrough, and high water cuts. This HPAM polymer converts a standard waterflood into a polymer-flood style operation, improving the water–oil mobility ratio, stabilizing the displacement front, and reducing bypassed oil.
Key Benefits
- Improves mobility ratio by thickening injection water at low polymer dosage.
- Reduces channeling through high-permeability streaks and fractures.
- Enhances sweep efficiency in mature and heterogeneous reservoirs.
- Extends useful life of existing waterflood infrastructure.
- Offers a scalable, field-proven chemical upgrade to conventional operations.
Typical Application Scenarios
Depleted waterfloods with high WOR, where marginal oil zones remain under-swept.
Strong contrast in permeability, requiring mobility control for better vertical conformance.
Fields with existing water injection facilities seeking low-CAPEX incremental recovery.
Technical Characteristics
The polymer is supplied as a free-flowing granular powder with high molecular weight and designed ionic character to suit common injection waters.
| Parameter | Typical Range |
|---|---|
| Appearance | Off-white granular powder |
| Molecular Weight | 5–22 million (grade dependent) |
| Ionic Type | Anionic HPAM (other types available) |
| Solid Content | ≥ 89% |
| Residual Monomer | ≤ 0.05% |
| Particle Size | 20–100 mesh |
| Working Concentration | 0.05% – 0.5% w/w |
| pH (1% solution) | Approx. 6 – 8 |
| Packaging | 25 kg bags / 750 kg jumbo bags |
Design & Implementation
Successful mobility control requires integration of geological, reservoir, and surface-facility understanding. Typical engineering workflow includes:
- Screening candidate patterns and wells based on water cut and remaining oil saturation.
- Performing core floods and rheology tests with formation water.
- Defining slug size, polymer concentration, and injection strategy.
- Planning phased rollout: pilot pattern → extension → field-wide deployment.
Solution Preparation & Injection
HPAM must be hydrated under controlled shear to unlock full viscosity and avoid polymer damage.
Typical Working Concentration
For waterflood mobility control, solutions are commonly prepared between 0.05% and 0.3% by weight, adjusted according to reservoir permeability, salinity, and target viscosity.
Field Monitoring Guidelines
- Track injection pressure trends and pattern injectivity.
- Monitor water cut, WOR, and oil production response over time.
- Observe produced polymer levels where sampling is available.
- Adjust polymer concentration or slug size based on pilot results.