低渗透储集层应力敏感性评价方法  

Stress Sensitivity Evaluation Methods of Low Permeability Reservoir

作　　者：徐立坤[1] 窦宏恩[1] 宋志同 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油西部钻探试油公司,新疆克拉玛依834000

出　　处：《地质科技情报》2015年第1期107-111,共5页Geological Science and Technology Information

基　　金：国家科技重大专项"我国油气田开发理论技术发展及潜力预测"(2011ZX05043-002)

摘　　要：低渗透储集层在开采过程中,随着流体的采出而使地层有效应力升高,从而导致储集层岩石发生变形,渗透率随之发生变化,呈现出应力敏感的特征。国内外许多学者对于这一问题进行了研究,但就低渗透储层是否存在强的应力敏感性这一问题还没有达成共识。针对这一问题,对应力敏感性评价标准SY/T 5358-2002给出的实验流程和评价准则以及目前现有的各种评价方法进行了分析,并提出了切合实际油田开发的实验流程和评价方法,在此基础上测定了安塞油田的应力敏感性,测定其应力敏感性为中等或中等偏强。The stress sensitivity of permeability is an important factor to evaluate the dynamic productivity of a reservoir. The lack of practicality of the stress sensitivity evaluation standard SY/T 5358-2002 makes it hard to determine the degree of the stress sensitivity of the low-permeability reservoir. In this paper, the experimental procedures and the evaluation methods of the SY/T 5358-2002 are analyzed first and a new method is provided. Specifically, for the experimental procedures, the Blot coefficient needs to be consid- ered for the conventional confining-changing measurement. And the starting point should be in-situ reser- voir pressure rather than 20 MPa as the SY/T 5358-2002 stated. Also, it is rational to set the ending point as half of the original pressure rather than 2.5 MPa. For the evaluation criteria, the change of the produc- tivity is considered to determine the critical value which can help to distinguish the degree of the stress sen- sitivity. According to this new method, the cores from Ansai Oilfield are tested and determined to be the moderate stress sensitivity.

关 键 词：低渗透 应力敏感性 实验 评价准则 

分 类 号：TE122.24[石油与天然气工程—油气勘探]