储层条件下的应力敏感性研究  

Study on stress sensitivity under reservoir conditions

作　　者：邓航 田巍[2] DENG Hang;TIAN Wei(Petroleum Exploration and Production Research Institute,SINOPEC,Beijing 100083,China;Exploration and Development Research Institute,Zhongyuan Oilfield Company,SINOPEC,Puyang 457001,China)

机构地区：[1]中国石化石油勘探开发研究院,北京100083 [2]中国石化中原油田勘探开发研究院,河南濮阳457001

出　　处：《断块油气田》2023年第6期933-939,共7页Fault-Block Oil & Gas Field

基　　金：河南省博士后基金资助项目“深层高压低渗油藏CO_(2)驱注气能力变化及调整对策”(2018120)。

摘　　要：针对当前低渗储层应力敏感性评价参考价值低的问题,文中采用实验与数值分析相结合的手段,提出了基于室内实验的储层应力敏感性评价方法。研究表明:将岩石应力敏感性与储层应力敏感性两者结合来分析更为科学合理;渗透率较低的岩石应力敏感性曲线呈现“假”两段式特征,虽然渗透率伤害80%以上发生在第1阶段,但结合储层应力敏感性曲线可证实2个阶段均处于拟塑性形变阶段,2个阶段被压缩的裂缝和孔道尺度不同,改变了应力敏感性曲线第2阶段均为弹性形变的认识,证实了实际储层开采初期天然微裂缝仍处于张开状态,在天然微裂缝完全闭合后进入弹性形变阶段;渗透率较低的储层应力敏感性两段式曲线可分为拟塑性形变和弹性形变2个阶段,渗透率伤害主要发生在第1阶段。该研究为储层应力敏感性评价提供了科学方法,也为深入开展储层评价及产能建设提供了重要技术支撑。In view of the low reference value of the current stress sensitivity evaluation of low permeability reservoir,the method of reservoir stress sensitivity evaluation based on laboratory experiment is proposed by combining experiment and numerical analysis.The results show that it is more scientific and reasonable to combine rock stress sensitivity and reservoir stress sensitivity.The stress sensitivity curve of rock with low permeability presents a"false"two-stage feature.Although more than 80%of the permeability damage occurs in the first stage,combined with the reservoir stress sensitivity curve,it can be confirmed that the two stages are both in pseudo-plastic deformation stage,and the scale of fractures and pores compressed in the two stages is different.This understanding has been refreshed that the second stage of the stress sensitivity curve shows elastic deformation,and confirmed that the natural micro-fractures are still in the open state in the initial development stage of actual reservoir,and enter the elastic deformation stage after the natural micro-fractures are completely closed.The two-stage stress sensitivity curve of low permeability reservoir can be divided into two stages,pseudo-plastic deformation and elastic deformation,and the permeability damage mainly occurs in the former stage.This study provides a scientific method for reservoir stress sensitivity evaluation,and also provides important technical support for further reservoir evaluation and production capacity construction.

关 键 词：岩石应力敏感性 储层应力敏感性 净应力 “假”两段式曲线 渗透率保持率 

分 类 号：TE312[石油与天然气工程—油气田开发工程]