碳酸盐岩裂缝液固两相耦合机理研究

发布时间：2018-06-06 11:23

本文选题：碳酸盐岩 + 液固两相　；参考：《西南石油大学》2016年硕士论文

【摘要】：近年来在新探明的复杂裂缝性油气储层在总的油气资源探明储量的比例不断增加,但由于裂缝性储层普遍埋藏深,钻井过程中安全密度窗口窄、井筒压力波动大,经常面临溢漏同存、井控风险大等问题。本文基于裂缝特征参数,测量与数字重构裂缝三维空间,并开展裂缝动态变形规律研究是前述问题和进一步开展相关工程技术研究的基础。本次论文综合利用精细面形测量、三维空间重构、多物理场有限元与离散元并行耦合模拟与理论方法,对单裂缝空间精细测量、建模并数学重构,开展裂缝动态闭合仿真模拟,研究取得了如下认识：(1)利用Shining 3D非接触式高精度测量系统,研究了天然裂缝表面的三维面形特征、裂缝的主要面形参数,重构裂缝表面及空间三维模型；(2)开展有限元模拟接触变形的塑性流动区域和应力分布规律；通过逆向工程建模及仿真模拟相结合的方法研究裂缝动态闭合过程中应力应变规律,研究验证了裂缝闭合三个阶段的应力分布、速度场、压力场的变化规律；(3)基于真实裂缝空间渗流的影响因素,仿真模拟真实裂缝粗糙度和裂缝宽度对渗流的影响,得出真实裂缝内流场分布。(4)采用离散元与有限元软件并行耦合运算方法,研究了裂缝空间在波动压力条件下,裂缝内固相颗粒运移沉降的一般规律,为揭示实际钻井工况压力动态变化下的裂缝空间动态变形时液-固耦合特征、随钻储层分析、储层保护及随钻堵漏等多个领域的深入研究提供理论依据。
[Abstract]:In recent years, the proportion of proven reserves in the total oil and gas resources of the newly proved complex fractured oil and gas reservoirs has been increasing, but due to the deep burial of the fractured reservoirs and the narrow safe density window during drilling, the wellbore pressure fluctuates greatly. Often faced with leakage co-storage, well control risk and other problems. In this paper, based on the characteristic parameters of fractures, the measurement and digital reconstruction of the three-dimensional space of fractures and the study of the dynamic deformation law of fractures are the basis of the above-mentioned problems and the further research of related engineering techniques. This paper synthetically uses fine plane shape measurement, three-dimensional space reconstruction, multi-physical field finite element and discrete element parallel coupling simulation and theory method, fine measurement of single crack space, modeling and mathematical reconstruction, and carries out simulation of crack dynamic closure. Using Shining 3D non-contact high precision measurement system, the 3D surface shape characteristics of natural cracks and the main surface parameters of cracks are studied. The plastic flow region and stress distribution of contact deformation are simulated by finite element method, and the stress-strain law in the process of crack dynamic closure is studied by the method of reverse engineering modeling and simulation. The study verifies the stress distribution, velocity field and variation rule of pressure field in the three stages of fracture closure. Based on the influencing factors of seepage flow in real fracture space, the influence of true crack roughness and crack width on seepage flow is simulated. It is obtained that the distribution of flow field in real fractures is a parallel coupling method of discrete element and finite element software, and the general law of solid particle migration and settlement in crack space under fluctuating pressure is studied. In order to reveal the liquid-solid coupling characteristics of fracture spatial dynamic deformation under actual drilling conditions, the theoretical basis is provided for the further study of reservoir analysis while drilling, reservoir protection and leakage plugging while drilling and so on.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TE21

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