具有大裂缝的异常高压气藏产水规律研究

发布时间：2018-09-05 14:50

【摘要】：异常高压气藏中一般存在大尺度裂缝和高渗夹层,它们构成了边底水的快速流动通道,导致气井出现大量产水的现象。建立起能够准确反映裂缝水窜过程的数值模型、分析储层与生产因素对产水规律的影响、总结归纳出气井产水特征,对这类气藏地层水的控制、开发方案的优化调整具有重要的实际意义。主要完成的工作和取得的认识如下:(1)分析了异常高压气藏的裂缝分布特征,并总结了有水气藏的水侵模式以及产水规律影响因素;(2)针对目的层内存在大尺度断层、裂缝且分布不连续的特点,分析了双重介质、离散裂缝、局部加密、等效渗流特征四种大裂缝描述方法的优势与不足,并在此基础上分别建立了均质储层模型和双重介质、局部加密、等效渗流特征数值模型,从描述裂缝水窜现象的准确性、计算成本等角度,优选出等效渗流特征方法作为大裂缝模拟方法,建立数值模拟模型以研究具有大裂缝的异常高压气藏的产水机理。(3)建立了具有大裂缝的异常高压气藏数值模拟单井模型,分析了水体大小、纵向大裂缝距原始气水界面的距离、纵向大裂缝距井水平距离、基质与裂缝渗透率比值和应力敏感等储层因素以及单井配产、射孔位置等生产因素对气井产水规律的影响。(4)根据克拉2气藏实际地质资料,建立了细化的能描述大裂缝与高渗条带的单井模型。通过生产测试数据的历史拟合,分析了气田纵向与横向上来水方向和水侵程度;模拟水侵形成水封气的过程,并在所得模型的基础上研究了不同控水治水措施的实施效果与对产水规律的影响。
[Abstract]:There are generally large scale fractures and high permeability interlayers in abnormal high pressure gas reservoirs, which constitute a rapid flow channel of edge and bottom water, resulting in a large amount of water production in gas wells. A numerical model which can accurately reflect the process of fracture water channeling is established, the influence of reservoir and production factors on water production law is analyzed, the characteristics of water production in gas wells are summarized, and the control of formation water in this kind of gas reservoir is summarized. The optimization and adjustment of the development scheme is of great practical significance. The main works and understandings obtained are as follows: (1) the distribution characteristics of fractures in abnormal high pressure gas reservoirs are analyzed, and the water invasion patterns of water-bearing gas reservoirs and the influencing factors of water production are summarized. (2) aiming at the existence of large-scale faults in the target layer, In this paper, the advantages and disadvantages of four methods for describing large fractures, such as double medium, discrete fracture, local infill, equivalent seepage characteristic, are analyzed, and the homogeneous reservoir model and dual medium are established on the basis of the characteristics of fracture and discontinuous distribution. Based on the numerical model of local infill and equivalent seepage characteristics, the equivalent seepage characteristic method is selected as the simulation method of large fracture from the angles of accuracy and calculation cost of describing the phenomenon of fracture water channeling. A numerical simulation model is established to study the water production mechanism of abnormal high pressure gas reservoirs with large fractures. (3) the single well model of abnormal high pressure gas reservoirs with large fractures is established, and the size of water body and the distance between longitudinal large fractures and the original gas-water interface are analyzed. The effects of reservoir factors such as horizontal distance from longitudinal large fractures to wells, the ratio of matrix to fracture permeability, stress sensitivity, single well production and perforation location on the water production law of gas wells. (4) according to the actual geological data of Kela 2 gas reservoir. A single well model which can describe large fracture and high permeability strip is established. Through the historical fitting of production test data, the direction and degree of water invasion in longitudinal and transverse gas fields are analyzed, and the process of forming water seal by water invasion is simulated. On the basis of the model, the effect of different water control measures and its influence on water production were studied.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE37

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