摘要
与常规油气藏不同,致密气藏的束缚水饱和度通常不再是一个定值,而是表现为压力的函数。为合理表征束缚水饱和度应力敏感性,并探究其对产水压裂气井动态特征的影响,建立了束缚水饱和度应力敏感条件下的相渗模型,并在此基础上构建致密气藏气-水两相渗流模型,进而探讨了束缚水饱和度应力敏感对相渗曲线、压力响应特征、产量特征等关键指标的影响。研究表明,束缚水饱和度应力敏感会导致压力导数双对数曲线后期向下偏移,同时会对气井稳产时间、水气比等生产指标造成显著的影响。因此,在致密气藏产水压裂气井动态反演、产能预测、合理开发方案制定等过程中,应充分考虑束缚水饱和度应力敏感。
Different from conventional reservoirs,the irreducible water saturation of tight gas reservoirs is not a fixed value,but a function of pressure.In order to reasonably characterize the stress sensitivity of irreducible water saturation and investigate its influence on the dynamic characteristics of fractured gas wells,a relative permeability model under irreducible water saturation stress-sensitivity condition is established.On this basis,a two-phase seepage model is built,and then the influence of irreducible water saturation stress-sensitivity is discussed.The results show that the stress-sensitivity of irreducible water saturation would lead to the change of the log-log plot for pressure derivative as well as the production performances.Therefore,during the dynamic inversion,production forecast and development plan formulation process of fractured water producinggas wells in tight reservoirs,the stress sensitivity of irreducible water saturation should be fully considered.
作者
窦祥骥
林恺
何岩峰
王相
刘成
赵虹宇
DOU Xiangji;LIN Kai;HE Yanfeng;WANG Xiang;LIU Cheng;ZHAO Hongyu(School of Petroleum Engineering,Changzhou University,Changzhou 213016,China;GuDong Production Technology Research Institute,Shengli Oilfield Branch of Sinopec,Dongying 257000,China)
出处
《常州大学学报（自然科学版）》
CAS
2018年第5期75-80,共6页
Journal of Changzhou University：Natural Science Edition
基金
江苏省高等学校自然科学研究项目(17KJB440001)
常州大学校启动基金项目(ZMF16020039)
关键词
致密气藏
产水压裂气井
束缚水饱和度
应力敏感
动态特征
tight gas reservoir
fractured water producing gas well
irreducible water saturation
stress sensitivity
dynamic characteristics
