底水油藏水平井产能评价与优化设计研究

发布时间：2018-08-22 20:19

【摘要】：水平井技术用于底水油藏开发,能够缓解底水上升现象。除了常规的全井段裸眼、射孔等完井方式,在此基础上为了进一步缓解底水脊进问题,又出现了分段、变密度射孔等几种完井方式,可以通过对水平井出水层段进行有效的封堵以及合理调整底水入流剖面,从而延长有效生产时间。本文以不同完井方式下相关参数的优化设计为目的,进行水平井的产能评价、脊进规律等方面的研究,为实际生产过程中的方案的优化设计提供可靠的理论依据。首先,分析了不同完井方式下水平井近井流动规律,利用势函数理论,建立油藏渗流与井筒沿程压降耦合模型。模型考虑了油藏流体向水平井筒以及射孔孔眼中的渗流,可以进行裸眼或射孔完井方式下全井段及分段生产时稳态产能评价。离散后的模型在给定水平井井底流压或产量的条件下进行迭代了求解,可用于水平井稳态时的产能评价及地层压力的求取。其次,在所建立的模型基础上进行了产能敏感性研究,得到水平井布井方位、储层各向异、孔密等各类参数以及水平井打开程度、分段模式等完井方式对水平井产能的影响,完成相关参数初步优化。最后,考虑到底水突破对水平井有效生产时间的影响,利用所建立的耦合模型,并将底水上升过程考虑成垂向上的活塞式水驱油过程,建立底水脊进模型。模型求解可计算出水平井底水突破时间,以及底水脊进动态变化规律,进而分析了不同完井方式下各类完井参数对底水上升规律的影响。结合产能分析的结果,以无水采油量为目标函数完成了综合优化设计。本文的研究成果可以进行全井段、分段裸眼完井以及全井段均匀密度、变密度、分段射孔完井方式下水平井的产能评价,并可以指导实际生产中相关参数的优化设计。
[Abstract]:Horizontal well technology used in bottom water reservoir development can alleviate bottom water rise. In addition to conventional completion methods such as open hole and perforation in the whole well section, in order to further alleviate the problem of bottom water ridge entry, several completion methods, such as piecewise perforation and variable density perforation, have emerged. The effective production time can be prolonged by effectively plugging the effluent layer of horizontal well and adjusting the bottom water inflow profile reasonably. For the purpose of optimizing design of related parameters under different completion modes, this paper studies the productivity evaluation and ridge advance law of horizontal wells, which provides a reliable theoretical basis for the optimization design of practical projects in production process. Firstly, the near-well flow law of horizontal wells under different completion modes is analyzed, and the coupling model of reservoir percolation and wellbore pressure drop is established by using the potential function theory. The model considers the percolation of reservoir fluid to horizontal wellbore and perforated hole, and can be used to evaluate the steady-state productivity of the whole well section and the segmented production under the open hole or perforation completion mode. The discrete model is solved iteratively under the condition of the bottom flow pressure or production rate of horizontal well, which can be used to evaluate the productivity of horizontal well in steady state and to calculate the formation pressure. Secondly, on the basis of the established model, the productivity sensitivity is studied, and the effects of various parameters, such as horizontal well layout orientation, reservoir orientation, pore density, horizontal well opening degree and segmental completion mode, on horizontal well productivity are obtained. Complete the initial optimization of related parameters. Finally, considering the effect of water breakthrough on the effective production time of horizontal well, the coupling model is established, and the bottom water rising process is considered as a vertical piston water flooding process, and a bottom water ridge model is established. The model solution can calculate the breakthrough time of horizontal well bottom water and the dynamic change of bottom water ridge, and then analyze the influence of various completion parameters on bottom water rising law under different completion modes. Combined with the result of productivity analysis, the comprehensive optimization design was completed with the objective function of waterless oil recovery. The research results of this paper can be used to evaluate the productivity of horizontal wells in the whole well section, segmental open hole completion, uniform density, variable density, and piecewise perforation completion, and can guide the optimization design of relevant parameters in actual production.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE328;TE349

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