Research on efficient numerical simulation method for integration fracking with production in shale oil reservoir...

Area of Science:

• Geosciences
• Petroleum Engineering
• Computational Mechanics

Background:

• Horizontal well hydraulic fracturing is key to shale reservoir productivity.
• Current understanding of fracture network expansion and fluid seepage in situ is limited.
• Accurate simulation of these processes is crucial for optimizing extraction.

Purpose of the Study:

• To develop and validate a dynamic geomechanical (DG) model for simulating hydraulic fracturing in shale reservoirs.
• To analyze fracture network expansion and fluid seepage under field conditions.
• To provide a tool for optimizing hydraulic fracturing design and enhancing reservoir productivity.

Main Methods:

• Development of a DG model integrating unsteady seepage and dilation-recompaction models.
• Construction of the geological model using segmented logging and production data.
• Numerical simulation calibrated with field data for history matching.

Main Results:

• The DG model accurately simulates multi-stage fracturing, reservoir property evolution, and productivity.
• Fracture half-length reached 148 m with 790.5 m³ injection, meeting design specs.
• Reservoir permeability increased significantly, maintaining 46 mD during production.

Conclusions:

• The DG model offers a comprehensive approach to shale reservoir development analysis.
• It accurately captures the dynamic processes of hydraulic fracturing and fluid flow.
• The model provides a foundation for improving productivity and optimizing fracturing strategies.