Study on Numerical Simulation and Development Strategies of the Keshen 5 Fractured Water-bearing Gas Reservoir in the Tarim Basin
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摘要: 克深5 气藏是一个裂缝性异常高压特低渗层状边水干气气藏, 由于裂缝发育, 气藏在开发之后快速见水, 开展水侵数值模拟及开发对策研究是该气藏提高采收率的关键, 为了更好描述储层特征, 采用嵌入式离散裂缝模型进行数值模拟, 针对裂缝性气藏历史拟合难度大的问题, 采用敏感性分析-生产动态拟合相结合、手工调整-自动调整相结合的思路开展拟合工作, 充分结合气藏实际水侵动态, 通过调整大裂缝, 基质与裂缝网格属性场等关键参数, 最终实现了全区历史拟合符合率为91%, 单井历史拟合符合率为86%。基于历史拟合结果及开发主控因素分析, 综合考虑不同采气速度、排水方式、排水规模、新井挖潜等因素, 设计12套提采方案, 预测模拟15 年结果优选出气藏排水采气方案为: 气藏配产105 万m3/天, 边部老井克深505、502、503 井排水, 克深5-5 井堵水, 鞍部部署一口水平井, 克深5-3 井北部部署一口定向井, 最终采出程度为23.7%。Abstract: The Keshen 5 gas reservoir is a fractured, abnormally high-pressure, ultra-low permeability, layered-edge water dry-gas reservoir. Due to the development of fractures, the gas reservoir quickly waters out after development. Thus, performing numerical simulations of water invasion and research on development strategies is the key to improving the recovery rate of the gas reservoir. To describe the reservoir characteristics more thoroughly, an embedded discrete fracture model was used for numerical simulation. In response to the difficulty of historical fitting for fractured gas reservoirs, a combination of sensitivity analysis, production dynamic fitting, and manual and automatic adjustment was adopted to perform the fitting work. The actual water invasion performance of the gas reservoir was fully combined, and attribute fields of key parameters, such as large fractures, matrix, and fracture grid, were adjusted. Finally, the historical fitting conformity rate of the entire area was 91%, and the historical fitting conformity rate of a single well was 86%. Based on the historical fitting results and an analysis of development control factors and taking into account factors such as different gas production rates, drainage methods, drainage scales, and new well potential excavation, 12 sets of extraction plans were designed. The prediction simulation results for 15 years showed that the optimal drainage and gas production plan for the gas reservoir were as follows: The gas reservoir production allocation is 1.05 million cubic meters per day; the old wells at the edge, KeS505, 502, and 503, are used for drainage; KeS5-5 is blocked; and a horizontal well is deployed in the saddle. A directional well is deployed north of KeS5-3, and the final recovery rate is 23.7%.
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