Optimization Method of Three-Dimensional Equilibrium Displacement in Thin Interbed Reservoirs.

Area of Science:

• Petroleum Engineering
• Reservoir Engineering
• Computational Modeling

Background:

• Thin interbed reservoirs suffer from poor water flooding efficiency due to uneven injection and production.
• Non-equilibrium flow leads to premature water breakthrough and increased water cut.

Purpose of the Study:

• To develop an intelligent model for optimizing water flooding in thin interbed reservoirs.
• To address the limitations of conventional methods in managing water channeling and improving sweep efficiency.

Main Methods:

• Development of a three-dimensional intelligent equilibrium displacement model (3D-IEDM).
• Utilized a water-injection splitting model and material balance principle for rate determination and saturation calculation.
• Employed an improved particle swarm optimization algorithm to minimize water saturation variance and optimize calculations.

Main Results:

• The 3D-IEDM optimized the vertical water injection profile, improving sweep efficiency in thin interbed reservoirs.
• Achieved a 6.45% increase in initial productivity and a 15% improvement in water injection utilization factor.
• Demonstrated a computation time approximately 14 times faster than conventional simulator-based methods.

Conclusions:

• The 3D-IEDM provides an effective quantitative scheme for optimizing water flooding in thin interbed reservoirs.
• The model significantly enhances oil recovery and injection efficiency while reducing computational time.
• Intelligent optimization of water flooding is crucial for maximizing resource utilization in challenging reservoir conditions.