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The aim is to analyze pressure behavior in heavy oil reservoirs considering viscosity and pressure-dependent properties during testing.

June 11, 2026Open Access

Pressure Analysis of Heavy Oil Reservoirs under High Viscosity and Pressure-Dependent Properties during Drawdown and Buildup Tests

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This review presents an analytical framework for pressure transient data in heavy oil reservoirs, highlighting implications for field development.

The aim is to analyze pressure behavior in heavy oil reservoirs considering viscosity and pressure-dependent properties during testing.
Synthesized recent work on pressure transient analysis and fluid-property nonlinearity.
Proposed a practical workflow for data screening and model selection.
Emphasized the importance of integrating PVT data, geomechanics, and rate history.
High viscosity delays radial-flow stabilization and increases wellbore-storage dominance.
Pressure-dependent properties significantly affect mobility and superposition during drawdown and buildup tests.
A coupled fluid-rock-flow analysis approach enhances the reliability of pressure interpretation.

Akpadu* et al. (2026) studied this question.

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This review presents an analytical framework for pressure transient data in heavy oil reservoirs, highlighting implications for field development.