多分支井产能评价研究

发布时间：2018-07-23 15:41

【摘要】：多分支井被认为是石油工业的革命性技术,在油气藏开发中有着重要的影响力。在特定的条件下,与常规水平井相比,多分支井可以有效增加与储层的接触面积,提高单井的生产能力,而对于多分支井的产能评价研究则是多分支井技术的前沿课题。对于空间多分支井,首先将Furui提出的箱形油藏中水平井渗流模型应用于气藏之中,并引入Babu等人提出的部分打开表皮因子,得到气藏中任意长度水平井的渗流模型,然后充分考虑了多分支井各部分的流动压降,最后通过建立气藏渗流与井筒流动的耦合模型对空间多分支井的产能进行研究,主要在耦合模型中引入了Ding Zhu等提出的微元段的部分打开表皮因子计算方法。以二分支井为例,计算得到分支井总产量及各分支的产量,分析了分支井筒之间的干扰情况。对于各分支位于同一平面且完全对称分布的多分支井,主要采用拟三维求解思想、保角变化、镜像反映原理及势的叠加原理等方法,重新考虑了各向异性的影响,对其产能公式进行研究,并对产能影响因素进行了分析。此外,对于常见的各分支位于同一平面但不完全对称的二分支和四分支水平井,本文根据基本渗流理论对其产能公式进行研究,并对影响产能的部分因素进行分析。对于鱼骨型分支井,将其渗流过程划分为外部渗流区和局部渗流区,采用保角变换和等值渗流阻力法,本文综合考虑各向异性和非达西流效应的影响,推导了鱼骨型分支井产能解析方程。
[Abstract]:Multi branch wells are considered as a revolutionary technology in the petroleum industry and have important influence in the development of oil and gas reservoirs. Under specific conditions, compared with conventional horizontal wells, multi branch wells can effectively increase the contact area with the reservoir and improve the production capacity of a single well. The study of productivity evaluation for multi branch wells is a multi branch well technology. For space multi branch wells, first of all, the horizontal well seepage model in the box type reservoir proposed by Furui is applied to the gas reservoir, and the skin factor proposed by Babu et al. Is introduced to get the seepage model of any length horizontal well in the gas reservoir, and then the flow pressure drop of each part of the multi branch well is fully considered. Finally, the flow pressure drop is taken into account. The coupling model of gas reservoir seepage and wellbore flow is established to study the productivity of space multi branch wells. In the coupling model, the calculation method of partial opening epidermal factors is introduced in the microelement segment proposed by Ding Zhu. A two branch well is taken as an example to calculate the total output of the branch well and the output of each branch, and analyze the branch wellbore. Interference conditions. For multi branch wells in the same plane and fully symmetrical distribution, the methods of quasi three dimensional solution, conformal change, mirror reflection principle and the superposition principle of potential are used to reconsider the influence of anisotropy, research on its productivity formula, and analyze the influencing factors of productivity. Two branches and four branch horizontal wells which are common in the same plane but not fully symmetrical are studied in this paper, and some factors affecting productivity are analyzed according to the basic percolation theory. For the fish bone type branch well, the percolation process is divided into external percolation zone and local percolation zone, and angle preserving change is adopted. In this paper, the equation of deliverability of fishbone multilateral wells is derived by considering the effect of anisotropy and non Darcy flow.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE328

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