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压裂水平井是有效开发低渗致密气藏和页岩气藏的主要手段,压裂水平井产能是决定非常规气藏开发成败的关键技术指标。但目前能够经济、快速地获得低渗致密气藏压裂水平井产能的方法很少。基于此,采用理想模型与数值模拟相结合的方式,得出了一种能快速评价低渗致密气藏压裂水平井产能的新方法。根据我国低渗透致密气藏的地质特点,建立了单井数值模拟模型。设计了8组16次正交试验,并对其进行了修正等时试井数值模拟。模拟结果表明,储层渗透率和储层有效厚度是影响气井产能的2个主要因素,并建立了不同裂缝条数的压裂水平井的二项式产能方程系数A和B与地层系数的经验关系。通过实例验证,该方法具有计算简单、适用性强、结果可靠的特点,能够节省大量时间和成本,适合现场快速评价应用。
Fractured horizontal wells are the main means for effectively developing low permeability tight gas reservoirs and shale gas reservoirs. Fracturing horizontal well productivity is the key technical index that determines the success of unconventional gas reservoirs. However, few methods are available to obtain the productivity of fractured horizontal wells in low-permeability and tight gas reservoirs economically and rapidly. Based on this, a new method to quickly evaluate the productivity of fractured horizontal wells in low permeability and tight gas reservoirs is obtained by a combination of ideal model and numerical simulation. According to the geological characteristics of low permeability and tight gas reservoirs in China, a single well numerical simulation model is established. Eight groups of 16 orthogonal experiments were designed, and the numerical simulation of isochronal well test was carried out. The simulation results show that the reservoir permeability and reservoir effective thickness are the two main factors that affect the productivity of gas wells. The binomial productivity equation coefficients A and B and the formation coefficient of fractured horizontal wells with different number of fractures are established relationship. Through the example verification, the method has the characteristics of simple calculation, strong applicability and reliable result, which can save a lot of time and cost, and is suitable for rapid field application evaluation.