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Coupled 4D Flow-Geomechanics Simulation to Characterize Dynamic Fracture Propagation in Tight Sandstone Reservoirs
Zhiyang Pi1,2, Gang Hui1,3, Youjing Wang4
1State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum (Beijing), Beijing 102249, China.
Dynamic fractures in tight oil reservoirs significantly impact oil recovery by linking with natural fractures, leading to early water breakthrough. Understanding this fracture propagation is key to improving oil production and water control.
Area of Science:
- Petroleum Engineering
- Geomechanics
- Reservoir Engineering
Background:
- Low recovery rates in China's tight oil reservoirs are a significant challenge.
- Intricate dynamic fracture propagation affects remaining oil distribution and production.
Purpose of the Study:
- To investigate the phenomenon of dynamic fracture propagation in tight oil reservoirs.
- To understand the impact of flow-geomechanical coupling on fracture evolution.
- To provide insights for improving oil recovery and water control.
Main Methods:
- Systematic summary of geoengineering integration workflow.
- Development of numerical simulation and geomechanical models using core analysis and rock mechanics data.
- Simulation of dynamic fracture propagation under flow-geomechanical coupling.
Main Results:
- Injection-induced fractures link with natural fractures when injection pressure exceeds formation rupture pressure.
- Natural fractures become effective after long-term water injection, connecting with hydraulic fractures.
- Dynamic fracture propagation is controlled by in situ stress evolution and fluid injection volumes.
Conclusions:
- Dynamic fracture propagation is a critical factor in water breakthrough and low recovery in tight oil reservoirs.
- The study provides a framework for analyzing fracture behavior in these reservoirs.
- Findings have implications for fracture characterization, residual oil production, and water control strategies.
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