裂缝性油藏注CO₂物质平衡方程的建立与应用

丁景辰

Ding Jingchen

中国石油大学（北京）教育部石油工程重点实验室，北京 102249

MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, China

注气开发，特别是注CO2开发，已经成为提高油藏采收率的重要手段之一。以往这种开发方式主要应用于常规油藏中，目前也开始逐渐应用于裂缝性油藏的开采。裂缝性油藏中的注气过程与非裂缝性油藏有很大区别，文中在常规油藏物质平衡的基础上，考虑注入气在裂缝和基质孔隙双重介质中的渗流和CO2的溶解，建立了裂缝性油藏的注气开采模型，进而建立了裂缝性油藏注CO2物质平衡方程。实例验证表明，本文所建物质平衡方程可以准确地拟合注CO2开发的裂缝性油藏的基质和裂缝储量，并为注CO2开发裂缝性油藏的方案编制提供有效依据。

Gas injection, especially CO2 injection, has been one of the most important ways to enhance oil recovery. This kind of development method was mainly applied in conventional reservoirs in the past. But it has now been more and more applied in fractured reservoirs. Gas injection process in fractured reservoirs is quite different from that in non￣fractured reservoirs. In this paper, on the basis of the material balance calculating method of conventional reservoirs, the gas flow and the dissolution of CO2 in fracture and matrix pore dual￣media reservoirs have been taken into account to establish a CO2 injection model in fractured reservoirs, and the material balance equation of CO2 injection in fractured reservoirs has been established as well. Finally, the results of the example validations indicate that the material balance equation established in this paper can accurately fit with the reserves of fracture and matrix systems in CO2 injection fractured reservoirs. The material balance equation can provide basis for compiling CO2 injection scheme.

10.6056/dkyqt201402017