致密油藏分段多簇压裂水平井压力动态分析及产能评价

发布时间：2018-11-28 16:45

【摘要】：致密油藏具有低孔、特低渗、孔隙结构复杂,存在启动压力梯度的特点,使得其开采难度较大,但随着中高孔渗为代表的优质储集层在油气资源中所占比例逐渐减少,油气勘探开发的重心由常规油气资源逐步转向致密油气藏等非常规油气资源。分段多簇压裂工艺是开发致密储层的关键技术,在我国长庆油田延长组致密油藏开发中取得较好的开发效果。理论研究与矿场实践表明,分段多簇压裂工艺能够形成复杂的地下缝网系统,获得更高的储层有效改造体积,有效改善储层渗流能力,实现油气增产的目的。目前对于分段多簇压裂水平井的理论研究较少,尤其是对其压力动态变化以及各个地层参数、裂缝参数对水平井产能的影响。本文在对分段多簇压裂水平井的主要流动阶段划分基础上,研究分段多簇压裂水平井的渗流模式,构建相应的数学模型,并用有限元方法进行了求解,系统研究了各参数对水平井压力动态变化的影响。结合国内外致密油藏的开发经验,运用数值模拟技术深入研究分段多簇压裂水平井产能变化规律,分析不同的裂缝半长、裂缝导流能力、裂缝密度、裂缝形态等参数对产能的影响,提出了合理的参数范围。在此基础上,对分段多簇压裂水平井的联合注采井网的样式、井排距离以及与裂缝形态的匹配程度进行了优化研究,研究结果为致密油藏的高效开发提供了理论指导和决策依据。
[Abstract]:The tight reservoir has the characteristics of low porosity, low permeability, complex pore structure and the characteristic of starting pressure gradient, which makes its exploitation difficult, but the proportion of high quality reservoir represented by medium and high porosity in oil and gas resources decreases gradually. The center of gravity of oil and gas exploration and development has gradually shifted from conventional oil and gas resources to unconventional oil and gas resources such as tight oil and gas reservoirs. Piecewise and multi-cluster fracturing technology is the key technology to develop dense reservoir, and good development effect has been obtained in the development of dense reservoir in Yanchang formation of Changqing Oilfield in China. Theoretical research and field practice show that segmented multi-cluster fracturing technology can form a complex underground fracture network system, obtain higher effective reservoir volume, effectively improve reservoir percolation capacity, and achieve the purpose of increasing oil and gas production. At present, there are few theoretical studies on segmented multi-cluster fracturing horizontal wells, especially on the pressure dynamic changes and the effects of fracture parameters on productivity of horizontal wells. On the basis of dividing the main flow stages of segmented multi-cluster fracturing horizontal wells, the percolation model of segmented multi-cluster fracturing horizontal wells is studied in this paper, and the corresponding mathematical model is constructed and solved by finite element method. The influence of various parameters on the pressure performance of horizontal well is studied systematically. Combined with the development experience of dense reservoirs at home and abroad, the productivity change law of horizontal wells with segmented multi-cluster fracturing is studied by numerical simulation technology, and different fracture half-length, fracture conductivity and fracture density are analyzed. The influence of fracture shape and other parameters on productivity is proposed, and a reasonable range of parameters is proposed. On this basis, the pattern of combined injection-production well pattern, well row distance and matching degree with fracture form of multi-cluster fracturing horizontal wells are optimized. The results provide theoretical guidance and decision-making basis for high-efficiency development of dense reservoirs.
【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】：TE357;TE328

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