Practice question from Fundamentals of Dual Porosity Concepts
Explain why a dual permeability model might be more appropriate than dual porosity for modeling a thick oil column with gravity drainage.
Answer
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Explanation
Dual permeability models allow both matrix and fractures to flow directly to wells (parallel flow) rather than assuming matrix only feeds fractures (series flow). This is critical for gravity drainage because oil rises through fractures while water can imbibe into matrix from below. The matrix contributes directly to vertical flow, and proper modeling of phase segregation requires both systems to have independent connections to wells. This approach better captures the physics of gravity-dominated recovery in thick, fractured reservoirs.