Examination of unconventional phenomena in naturally fractured liquid-rich gas reservoirs: single-block compositional model
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- 作者：B. N. Al Ghamdi ; L. F. Ayala H.
- 关键词：Liquid ; rich gas reservoirs ; Naturally fractured systems ; Condensate blockage ; Capillary pressure ; Diffusion
- 刊名：Journal of Petroleum Exploration and Production Technology
- 出版年：2017
- 出版时间：March 2017
- 年：2017
- 卷：7
- 期：1
- 页码：265-279
- 全文大小：1694KB
- 刊物主题：Geology; Industrial and Production Engineering; Energy Technology; Offshore Engineering; Industrial Chemistry/Chemical Engineering; Monitoring/Environmental Analysis;
- 出版者：Springer Berlin Heidelberg
- ISSN：2190-0566
- 卷排序：7
文摘
During the depletion of liquid-rich gas reservoirs, the gas condenses as the pressure inside the reservoir reduces below the hydrocarbon dew-point pressure, which introduces retrograde condensate. In such conditions, the productivity experiences a reduction in recovery due to the appearance of condensate near the production channels. This work is aimed to provide insight on productivity characteristics of a liquid-rich gas system in unconventional environments and extend the scrutiny on the propagation of condensate while activating capillary forces and diffusion. The impact of capillary pressure on phase behavior was explored using an in-house generated coupled phase behavior model with a capillary pressure equation. The influence of capillary pressure was examined against different sets of composition combinations in different reservoir settings. Capillary force extents were highly dependent on composition combinations and pore throat radiuses. Mixtures with higher volatile concentrations showed the highest capillary forces. The enhancement in condensate propagation, resistance to gas flow, and impact on recovery were explored at 10- and 20-nm pore throat sizes. The investigation suggested that interfacial tensions implied greater influence on the flow behavior in oil-dominated systems than in gas-dominated conditions. Evaluating the flow performance of unconventional phenomena in liquid-rich gas reservoirs was extended to include diffusion while activating capillary forces. The results showed higher domination of diffusion on reservoir performance, which provided additional fluid recovery. Subsequently, the enhanced withdrawal of fluid dismissed the impact of capillary forces on gas flow and the impact of condensate blockage.