串珠状缝洞型碳酸盐岩储层压力变化特征研究

发布时间：2018-05-23 15:00

本文选题：串珠状缝洞型碳酸盐岩 + 数学模型　；参考：《西南石油大学学报(自然科学版)》2017年01期

【摘要】：目前的缝洞型碳酸盐岩储层模型建立主要以多重介质、渗流、管流或渗管流结合等理论为基础,但是当储层内具有大尺度溶洞时,多重介质、渗流理论不能准确表征宏观缝洞储集体。当储层内具有大开度裂缝时,其内部流体流动特征与平板流特征更为接近。因此,需要建立以裂缝平板流与宏观非均质性理论为基础的储层模型。根据气体物质守恒方程与流体力学方程,推导了更接近于真实大型裂缝中气体流动特征的平板流动模型,建立了串珠状缝洞型碳酸盐岩气藏储层的宏观非均质数学模型,并通过数值方法求解出该模型定产量生产时井底压力与各溶洞压力数据。绘制出了溶洞压力导数半对数曲线和井底压力双对数曲线。压力导数双对数曲线可以分为4段:井筒储集反应段、裂缝反应阶段、溶洞反应阶段和边界反应阶段。随后,分别研究了各类缝洞参数对压力导数双对数曲线形态特征的影响。研究表明,不同的缝洞参数会影响压力导数双对数曲线上相应阶段的形态特征。
[Abstract]:The current model of fractured and cavernous carbonate reservoir is mainly based on the theories of multiple media, percolation, pipe flow or seepage pipe flow, but when there are large scale caverns in the reservoir, there are multiple media. The percolation theory can not accurately characterize the macroscopic fracture and cavern reservoir. When there are large opening fractures in the reservoir, the characteristics of fluid flow in the reservoir are closer to those of the flat flow. Therefore, a reservoir model based on the theory of fractured plate flow and macroscopic heterogeneity is needed. Based on the gas material conservation equation and fluid dynamics equation, a plate flow model is derived, which is closer to the characteristics of gas flow in real large fractures, and a macroscopic heterogeneous mathematical model is established for the reservoir of series beaded fractures and cavernous carbonate reservoirs. The data of bottom hole pressure and cavern pressure are obtained by numerical method. The semi-logarithmic curve of the pressure derivative and the double logarithmic curve of the bottom hole pressure are plotted. The double logarithmic curve of pressure derivative can be divided into four sections: wellbore reservoir reaction stage, fracture reaction stage, cavern reaction stage and boundary reaction stage. Then, the influence of various fracture and cavity parameters on the shape of double logarithmic curve of pressure derivative is studied. The results show that different fracture and cavity parameters will affect the morphological characteristics of the corresponding phase on the double logarithmic curve of pressure derivative.
【作者单位】：中国石油塔里木油田公司勘探开发研究院;"油气藏地质及开发工程"国家重点实验室·西南石油大学;
【基金】：中国石油塔里木油田局级项目(041013100041)
【分类号】：TE31

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