Experimental Study on the Application of Polymer Agents in Offshore Oil Fields: Optimization Design for Enhanced Oil Recovery
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View abstract on PubMed
Summary
This summary is machine-generated.Discontinuous chemical flooding using multiple agents significantly enhances oil recovery in heterogeneous reservoirs. This method optimizes chemical slug size, injection timing, and combinations for improved sweep efficiency and higher incremental oil recovery.
Area Of Science
- Petroleum Engineering
- Enhanced Oil Recovery
- Reservoir Engineering
Background
- Bohai oilfield exhibits severe heterogeneity and high permeability, resulting in low water flooding recovery efficiency.
- Conventional polymer flooding has limitations in highly heterogeneous reservoirs, necessitating supplementary technologies.
- Enlarging swept volume is crucial for improving oil recovery in such challenging fields.
Purpose Of The Study
- To investigate discontinuous chemical flooding with multiple chemical systems for enhanced oil recovery (EOR).
- To optimize the design of discontinuous chemical flooding, including slug size, combination method, and shift timing.
- To evaluate the effectiveness of discontinuous chemical flooding in improving displacement equilibrium and incremental oil recovery.
Main Methods
- Core flooding experiments and displacement equilibrium degree calculations were employed.
- Three chemical systems were evaluated: polymer gel (PG), hydrophobically associating polymer (polymer A), and conventional polymer (polymer B).
- Parallel core displacement experiments (three-core and five-core) were conducted to validate and optimize the method.
Main Results
- Discontinuous chemical flooding demonstrated a stepwise change in the displacement equilibrium curve.
- Efficiency increased with reservoir heterogeneity and the number of layers.
- Optimal conditions achieved a displacement equilibrium degree of 87.7% and a 24.5% incremental oil recovery compared to continuous flooding.
Conclusions
- Discontinuous chemical flooding is an effective strategy for enhancing oil recovery in heterogeneous reservoirs.
- The method offers significant potential for improved sweep efficiency and oil displacement.
- Optimization of chemical slug design and injection timing is critical for maximizing EOR performance.
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