泥页岩水化导致油气井井壁失稳研究进展

Research progress of shale hydration lead to wellbore instability

寻求泥页岩水化过程中其强度变化的规律是油气井井壁稳定性研究的重要内容之一,目前国内外相关研究根据分析方法,大致可以分为经典动力学法、微观图像分析法和在微观图像分析法基础上发展起来的混沌动力学分析法。而目前的研究几乎都是从经典动力学的决定论观点出发,试图给出泥页岩水化对井壁稳定性影响规律,目前对这一过程仍然有很多机理问题认识并不彻底。由于泥页岩水化影响强度变化的过程表现出明显的混沌动力学系统所具有的特征,所以依据非线性混沌动力学分析理论,建立泥页岩井壁稳定非线性混沌动力学计算模型将是一条分析泥页岩井壁稳定性问题的有效途径。

Seeking its intensity change rule in the process of hydration of the shale is one of the important content of wellbore instability research. The research according to the analysis method can be roughly divided into Classical dynamical method, microscopic image analysis, and chaos dynamic analysis method based on microscopic image analysis method. Now, almost all the research from the classical theory of determinism viewpoint, it tries to give the shale hydration effects on the stability of borehole wall, the understanding of mechanism of this process there are still many problems is not complete. Due to shale hydration process that result in the change of intensity showed obvious features that are characteristic of chaotic dynamics system, so based on the theory of nonlinear chaotic dynamics analysis, mud shale borehole wall stability of nonlinear chaotic dynamics calculation model is set up to be part of a new analysis to the problems of mud shale borehole wall stability.