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低渗透储层岩性致密、渗流阻力大、压力传导能力差,地层压力的下降会对渗透率造成伤害而影响油气井产能。目前,一般通过室内物理模拟实验评价渗透率应力敏感性。从实验条件、渗透率基值以及岩石固有属性等方面对应力敏感性评价结果的影响因素进行了深入剖析。结果表明,流动介质、含水饱和度、加压方式和渗透率基值等是影响应力敏感性实验结果的外因,渗透率、粘土矿物含量和孔隙类型是影响应力敏感性实验结果的内因。为了保证应力敏感性评价结果的正确性,在进行物理模拟实验的同时,还应结合评价区块的实际情况,选择合理的实验条件、渗透率基值以及有代表性的岩心。
Low-permeability reservoirs are characterized by tight lithology, large seepage resistance and poor pressure-conducting ability. The decrease of formation pressure will affect the permeability and affect the productivity of oil and gas wells. Currently, permeability stress sensitivity is generally evaluated by in-house physical simulation experiments. Influencing factors of stress sensitivity evaluation results are analyzed in terms of experimental conditions, permeability base value and inherent properties of rock. The results show that the exogenous factors, permeability, clay mineral content and pore type that affect the result of stress sensitivity are the internal factors that affect the experimental results of stress sensitivity. The flow medium, water saturation, pressurization method and permeability are the base values. In order to ensure the correctness of stress sensitivity evaluation results, physical simulation experiments should be carried out. At the same time, reasonable experimental conditions, permeability base values and representative cores should be selected in combination with the actual situation of evaluation blocks.