摘要
为了研究致密气藏的应力敏感特征,同时评价其对致密气藏气井单井产能的影响,利用定围压变流压的方法进行了含束缚水致密气藏岩心的室内应力敏感性测试实验。结果表明:随着开采过程中岩心内孔隙流体压力的降低,岩心的孔隙度和渗透率均不断下降。随着孔隙度的降低,孔隙度应力敏感性也逐渐减弱;随着渗透率的降低,渗透率应力敏感性也逐渐减弱;致密气藏岩心的渗透率的应力敏感性要强于其孔隙度的应力敏感性。在实验基础上建立了考虑致密气藏岩心渗透率和孔隙度应力敏感性的气井产能方程,并进行了实例验证。
In order to study the stress sensitivity characteristics of tight gas reservoir and evaluate the influence of the stress sensitivity on the productivity of gas well,the stress sensitivity test of tight gas reservoir cores containing irreducible water is carried out under constant confining pressure and variable flowing pressure. The experimental results indicate that the permeability and the porosity of the cores decrease with the decreasing of flowing pressure. The stress sensitivity of the porosity and the permeability of tight gas reservoir decreases with the decreasing of the porosity and the permeability. Meanwhile,the stress sensitivity of the permeability is stronger than that of the porosity. A new productivity equation of a gas well in tight gas reservoir in which the stress sensitivity of the porosity and the permeability is considered is established on the basis of the experiment. The correction of the productivity equation is verified by a case.
出处
《西安石油大学学报（自然科学版）》
CAS
北大核心
2014年第3期63-67,9,共5页
Journal of Xi’an Shiyou University（Natural Science Edition）
基金
国家自然科学基金项目"超深层油气藏岩石垂向分布规律及渗流特征研究"(编号:50874114)部分成果
关键词
致密气藏
应力敏感性
孔隙度
渗透率
产能方程
tight gas reservoir
stress sensitivity
porosity
permeability
gas well productivity equation
