缝洞型油藏井钻遇大尺度部分充填溶洞数学模型

发布时间：2018-04-28 09:31

本文选题：缝洞型油藏 + 大尺度溶洞　；参考：《地球科学》2017年08期

【摘要】：缝洞型油藏不同介质间流体窜流的研究对于大尺度溶洞中原油是否能够得到有效开发具有重大意义.基于缝洞型油藏大尺度溶洞充填特征,建立了井钻遇大尺度部分充填溶洞数学模型,采用Laplace变换和Stehfest数值反演,分别得到了基岩-溶洞未充填区域窜流量、溶洞充填区域-溶洞未充填区域窜流量和大尺度溶洞无因次流量,并分析了不同参数对窜流特征曲线的影响.研究结果表明:流体窜流过程可划分为4个流动阶段,流动前期和中前期主要为基质中流体向溶洞未充填部分窜流;流动中后期和后期主要为溶洞充填物流体向溶洞未充填部分窜流.在流动前期,基质和未充填溶洞间流体交换对部分充填溶洞流量贡献较大;而流动后期,溶洞充填物和未充填溶洞间流体交换对部分充填溶洞流量贡献较大.重力会导致溶洞充填物-溶洞未充填部分窜流量减小,而基质-溶洞未充填部分窜流不受到重力影响.溶洞充填程度、溶洞未充填部分和基质系统能量等因素对窜流特征曲线具有重大的影响.研究方法和结果对合理分析缝洞型油藏大尺度溶洞流动特征具有一定的指导意义.
[Abstract]:The study of fluid channeling between different media is of great significance for the effective development of crude oil in large scale caverns. Based on the characteristics of large scale cavern filling in fractured and cavernous reservoirs, a mathematical model of large scale partially filled caverns in borehole drilling is established. By using Laplace transform and Stehfest numerical inversion, the channeling flow in unfilled area of bedrock and cavern is obtained, respectively. The channeling flow rate and the dimensionless flow rate of large scale caverns in cavern filling area-cavern unfilled area are analyzed, and the influence of different parameters on the characteristic curve of channeling is analyzed. The results show that the fluid channeling process can be divided into four stages. In the middle and late stages of flow, the main flow is the flow of cavern filling material flow to the unfilled part of the cave. In the early stage of flow, fluid exchange between matrix and unfilled cavern contributes to the flow of partially filled caverns, but at the late stage of flow, fluid exchange between cavern and unfilled cavern contributes greatly to the flow of partially filled cavern. Gravity will lead to the decrease of channeling flow between the cavern filling and the unfilled part of the cavern, while the unfilled part of the matrix cavern will not be affected by gravity. The cavern filling degree, the unfilled part of the cave and the energy of matrix system have great influence on the characteristic curve of channeling flow. The research methods and results have certain guiding significance for the reasonable analysis of the flow characteristics of large scale caverns in fractured and cavernous reservoirs.
【作者单位】：北京大学工程科学与新兴技术高精尖创新中心;北京大学工学院;
【基金】：国家科技重大专项(No.2016ZX05014004-006) 中国博士后科学基金项目(No.2017M610706)
【分类号】：TE21

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