【摘要】 针对延安气田气井单层产气量普遍较低、储层非均质性较强、多层合采易造成层间干扰和倒灌现象等难题，运用长岩心并联物理模拟实验模拟了致密气藏定容衰竭开发过程，并且系统研究了渗透率级差、配产、接替时机以及控制储量等因素对多层合采气井产气特征和采收率的影响规律。结果表明：渗透率级差越大、配产越高、接替时机越晚，低渗层产量贡献率和采收率越低；由于延安气田各层原始地层压力差异较小，接替时机越晚，层间压差越大，倒灌现象越严重，开发效果越差；气层控制储量增大，产量贡献率会明显提升。该研究成果对致密气藏制定合理开发方式和开发技术政策能够提供重要理论依据。更多还原

【Abstract】 In Yan’an Gas Field, there are serious problems such as generally low single-layer gas production, strong reservoir heterogeneity, interlayer interference and backflow phenomenon caused by multilayer commingled production. In order to solve these problems, long-core parallel physical simulation experiments were conducted to simulate volumetric depletion development process in tight gas reservoirs, and systematically investigate the effects of permeability contrast, production rate, succession timing, and controlled reserves on gas production characteristics and gas recovery of multilayer commingled production wells. The results indicate that the production contribution and gas recovery in low-permeability layers decrease with the increase of permeability contrast, production rate and succession timing. As initial pressure differences between multilayers in Yan’an gas field are relatively small, the delayed succession timing results in larger interlayer pressure differentials and more serious backflow phenomenon, and thus poorer development performance. Production contribution rate of reservoir layers is significantly improved with the increase of controlled reserves. These results provide significant theoretical guidance for formulating rational development strategies and technical policies in tight gas reservoirs.更多还原