摘要
从实验和理论研究2个方面,对近年来国内外泥页岩井壁稳定耦合研究的现状进行了分析。目前,泥页岩井壁稳定耦合研究主要有3种方法:一是通过泥页岩水化实验和吸水实验,用热弹性比拟法研究由于含水量变化引起的水化应力;二是通过压力传递实验,用非平衡热动力法研究化学渗透作用引起岩石内部孔隙压力变化而导致的附加应力;三是通过压力传递与水化实验,用总水势法研究基于膨胀机理和耦合渗透流动而导致的膨胀应力。通过分析认为,泥页岩井壁稳定的研究虽然取得了一定成效,但仍然存在着复杂的问题和不足,还需要进一步深化机理和应用方面的研究。
This paper analyzes the present situation of shale borehole stability coupling in recent years at home and abroad from principal experiment and theory researches. At present, there are mainly three methods for studying the shale wellbore stability coupling. One is the study of hydration stress induced by change of water content using thermoelastieity analog technique through shale hydration test and water absorbing test. Another is the examination of additional stress induced by change of pore pressure based on chemical osmosis using nonequilibrium thermodynamics through pressure transmission test. The third is the exploration of swelling stress induced by swelling mechanism and coupled osmosis flow using total water potential through pressure transmission and hydration test. It has been found that the research of shale borehole stability have acquired some good results. However, because of complexity of the problems, there have been a few defects in existing research results, which needs the further research on mechanism and application.
出处
《断块油气田》
CAS
2012年第4期517-521,共5页
Fault-Block Oil & Gas Field
基金
国家科技重大专项"西部山前复杂地层安全快速钻完井技术"(2008ZX05021-001)
关键词
泥页岩
井壁稳定
耦合
水化
渗透作用
shale
wellbore stability
coupling
hydration
osmosis
