摘要
泥页岩井壁失稳的化学与力学耦合作用是井壁稳定性研究中较为关注的问题。笔者对近年来国内外在这方面的研究现状进行了分析研究 ,将其理论与研究方法大致分为以下 4类进行了详细的讨论 :泥页岩内水的传输机理 ;总吸附水相关法 ;等效孔隙压力法 ;总水势的增量弹性理论。通过分析认为 ,在钻井液—页岩体系中 ,水和离子在水力压差和活度差的作用下进入 (流出 )页岩 ,从而影响井眼附近应力分布和页岩物性。这种影响可以粗略地通过渗透压或含水量的方式定量计入井壁稳定性力学分析中。然而 ,虽然泥页岩水化的力学与化学耦合研究已经开始 ,但由于问题的高度复杂性 ,已有的研究成果相互之间并不一致 ,而且每种理论和方法都有明显的缺陷 ,尚需更为逼近真实的理论基础和进一步深化的机理研究。参
Shale stability coupling with mechanics and chemistry is a focus of attention in the field of borehole wall stability study. After reviewing this issue′s studies at home and abroad, four kinds of research method and theory are classified which are: mechanism of water transmitting in shale; theory of total adsorption water; theory of equivalent pore pressure; and incremental elastic theory based on total aqueous potential. Through comprehensive analysis, it is found that: In the fluid-shale system, water and ions flow into or out of shale, changing the shale properties and stress distribution around wellbore. This change can be quantitatively analyzed by the methods above. On the other hand, because of extremely complication of the problem, those methods and theories do not agree on some basic points, each of them has their own disadvantages. More realizable and realistic theory and more deep mechanism research are required in order to understand shale hydration from coupling viewpoint of mechanics and chemicals.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2003年第1期109-111,共3页
Petroleum Exploration and Development
