论文部分内容阅读
异常高压气藏具有变形介质特征,在衰竭式开采过程中有效应力不断压缩岩石骨架,使得孔隙度与渗透率不断降低,表现出应力敏感性特征,从而影响气藏的开发效果。为科学高效开发气藏,本文在前人研究成果的基础上,建立了异常高压应力敏感性气藏开发动态预测模型,以此研究应力敏感性气井产能与开发动态变化规律。研究及实例计算结果表明,应力敏感性气井产能与井底流压较非应力敏感性气井下降快,前者生产压差大、稳产期短,废弃时地层压力较后者高,采收率相对较低。通过本文研究能够确定合理生产压差及采气速度,其研究成果能有效指导类似气藏高效开发。
The abnormally high pressure gas reservoirs have the characteristics of deformation media and effectively compress the rock skeleton during the depletion mining process, resulting in the decrease of porosity and permeability, showing the characteristics of stress sensitivity and thus affecting the development effect of gas reservoirs. In order to develop gas reservoir efficiently and scientifically, based on the previous research results, this paper established a dynamic prediction model for the development of abnormally high pressure stress sensitive gas reservoirs to study the productivity and development of stress-sensitive gas wells. The results of the study and examples show that the stress-sensitive gas well productivity and the bottom hole flow pressure drop faster than the non-stress-sensitive gas wells. The former has large production pressure difference and short stable production period, and the formation pressure is higher than the latter when abandoned, and the recovery rate is relatively low . Through this study, we can determine the reasonable production pressure difference and gas production rate, and the research results can effectively guide the similar gas reservoirs to develop effectively.