高低压双气层合采产气特征

多层合采问题已经做过大量的研究工作，但采用的方法通常是数值模拟、试井分析等，为了更真实地认识“一井多层”低渗气藏（气层物性特征相近，初始压力不同）多层合采时的产气特征，引入了物理模拟技术，结合气藏实际，采用气藏天然岩心，建立了高低压双气层无窜流物理模型（简称“并联”模型），实验模拟气藏定容衰竭开采方式，研究了不同初始压力双气层合采时单层产气、压力变化规律，单层产量贡献特征，气层采收率，配产、高低压气层初始压差对生产的影响等方面，取得了一定的认识。采用物理模拟技术研究多层合采产气特征尚属新的尝试，拓展了该领域的研究方法和思路，研究成果对制定类似气藏的合理开发技术策略提供参考依据。

Gas producing property of commingled production for high-low pressure double gas reservoir

A lot of work has been done on the research of multilayer commingled production but the common methods are numerical simulation and well testing analysis. In order to know the gas producing property of low permeability gas reservoir characterized by “one well with multilayer” truly (the physical property is similar while the initial pressure is different) when multilayer commingled production, the physical simulation technology was introduced and high low pressure double layer physical model without inter flow between layers (parallel connection model in short), combining with the actual gas reservoir and adopting natural core of gas reservoir, was established. The experiment, simulating the depletion drive development with constant volume, studied the influence of gas production of a single layer when double layers commingled production under different initial pressures, the changing rule of pressure, gas production contribution of a single layer, gas recovery efficiency, prorating production and initial pressure difference of high low gas reservoir on production. It is a new move to study gas producing property of commingled production, which broadens the ideas on research method and provides references for the reasonable development of such similar gas reservoirs.