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塔里木盆地和田河气田奥陶系底水气藏为裂缝性碳酸盐岩气藏,地质研究表明,该气藏水侵的主要方式为水锥型。为了分析该气藏底水上升规律,给开发方案设计提供科学依据,决定利用单井剖面模型对水锥机理进行研究。在分析其主要地质特征的基础上建立了单井剖面模型,采用数值模拟技术研究不同水体大小、不同有效厚度、不同射开厚度、不同非渗透层、不同地层渗透率、不同生产压差以及水平井技术对底水锥进的影响。结果发现,水体大小等因素都对底水锥进产生不同程度的影响,水平井则可以把“底水锥进”演变为“底水推进”。通过机理研究基本搞清了气藏底水运动规律,得出了防止和控制底水上升的措施。据此,建议气藏开发时采用水平井技术,气井部署在储层有效厚度大、平面渗透率较高、垂向渗透率较低的区域,射孔时应有一定的避射厚度,生产时要注意控制生产压差。
The Ordovician bottom water gas reservoir in the Hetianhe gas field of Tarim Basin is a fractured carbonate gas reservoir. Geological studies show that the main mode of water intrusion in this reservoir is the water conical type. In order to analyze the rising law of bottom water in this reservoir, it provides a scientific basis for the design of development plan and decides to use the single well section model to study the water cone mechanism. Based on the analysis of its main geological features, a single well profile model was established. Numerical simulation was used to study the effects of different water body sizes, different effective thicknesses, different shotcrete thicknesses, different non-permeable layers, different formation permeability, different production pressures and water Impact of Hirai Technology on Bottom Water Coning. The results show that water body size and other factors have varying degrees of impact on the bottom water coning, horizontal wells can be “bottom water coning” evolved into “bottom water advance.” The mechanism of bottom water movement in gas reservoirs was basically ascertained through the mechanism study, and the measures to prevent and control the rise of bottom water were obtained. Therefore, it is suggested that horizontal wells should be used in the development of gas reservoirs. The gas wells should be deployed in areas with large reservoir effective thickness, high plane permeability and low vertical permeability. When the wells are perforated, there should be a certain thickness to avoid shooting during production Pay attention to control the production pressure.