Analysis of Steam/Solvent-Coinjection Processes by Use of Dynamic Gridding
- Chris Carpenter (JPT Technology Editor)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- March 2015
- Document Type
- Journal Paper
- 128 - 132
- 2015. Society of Petroleum Engineers
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- 41 since 2007
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This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 169075, “A Methodological Analysis of the Mechanisms Associated With Steam/Solvent-Coinjection Processes by Use of Dynamic Gridding,” by A. Perez-Perez, M. Mujica, and I. Bogdanov, CHLOE, and J. Hy-Billiot, Total, prepared for the 2014 SPE Improved Oil Recovery Symposium, Tulsa, 12–16 April. The paper has not been peer reviewed.
Hybrid steam/solvent processes have gained importance as a thermal-recovery process for heavy oils in recent years. Among the identified physical mechanisms that play a role during these processes are heat-transfer phenomena, gravity drainage and viscous flow, solvent mass transfer, and mass-diffusion/-dispersion phenomena. In this paper, a study of sensitivity to grid size is described. Ideally, this work will provide some insight into methodological aspects to be considered when hybrid steam/ solvent processes are modeled.
Recent studies concerning the size of the liquid-solvent-rich zone where molecular diffusion and dispersion occur have implied that a detailed representation of the solvent/steam- chamber edge is necessary in the numerical model. To represent this front appropriately, the authors propose application of fine-grid models to represent the steam/ solvent condensation zone and, in parallel, activation of the adaptive-mesh refinement (AMR) option for amalgamating the internal and external portions of the steam chamber zone. It is expected that, with this simulation strategy, a detailed representation of the front will be caught by a fine model, while a coarse model will be sufficient to represent the heat-transfer phenomenon that dominates in the noncritical zone. For a discussion of the amalgamation process, please see the complete paper.
Synthetic Reservoir Model. A synthetic reservoir representing a generic formation of Athabasca oil sands (western Canada) is used in this work. The reservoir consists of a pay zone rich in oil. The pay zone is 45.5 m in length (x-direction) and 50 m in thickness (z-direction).
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