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Experimental and Numerical Assessment of the Influence of Bottomhole Pressure Drawdown on Terrigenous Reservoir Permeability and Well Productivity

Sergey Popov1, Sergey Chernyshov2,*, Evgeniy Gladkikh2
1 Oil and Gas Research Institute of Russian Academy of Science, Moscow, 119333, Russian
2 Perm National Research Polytechnic University, Perm, 614990, Russian
* Corresponding Author: Sergey Chernyshov. Email:
(This article belongs to this Special Issue: Fluid Dynamics & Materials Processing in the Oil and Gas Industry)

Fluid Dynamics & Materials Processing 2023, 19(3), 619-634. https://doi.org/10.32604/fdmp.2022.021936

Received 31 January 2022; Accepted 03 May 2022; Issue published 29 September 2022

Abstract

During oil and gas fields development, a decrease in reservoir and bottomhole pressure has often a detrimental effect on reservoir properties, especially permeability. This study presents the results of laboratory tests conducted to determine the response of terrigenous reservoir core-sample permeability to changes in the effective stresses and a decrease in the reservoir pressure. The considered samples were exposed for a long time to a constant high effective stress for a more reliable assessment of the viscoplastic deformations. According to these experiments, the decrease of the core samples permeability may reach 21% with a decrease in pressure by 9.5 MPa from the initial reservoir conditions. Numerical simulations have been also conducted. These have been based on the finite element modeling of the near-wellbore zone of the terrigenous reservoir using poroelasticity relations. The simulation results show a limited decrease in reservoir permeability in the near-wellbore zone (by 17%, which can lead to a decrease in the well productivity by 13%).

Graphical Abstract

Experimental and Numerical Assessment of the Influence of Bottomhole Pressure Drawdown on Terrigenous Reservoir Permeability and Well Productivity

Keywords

Terrigenous reservoir; permeability; core sample; reservoir pressure; bottomhole pressure drawdown; effective stress; well productivity

Cite This Article

Popov, S., Chernyshov, S., Gladkikh, E. (2023). Experimental and Numerical Assessment of the Influence of Bottomhole Pressure Drawdown on Terrigenous Reservoir Permeability and Well Productivity. FDMP-Fluid Dynamics & Materials Processing, 19(3), 619–634.



This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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