Borehole instability mechanism and Countermeasures Part-II

2. Indoor test Way of fabric formation characteristics, physical and chemical properties and wellbore stability
A. Analysis Method of Formation fabric characteristics
a. Visual inspection; b. IR spectroscopy, differential thermal analysis, etc; c. SEM; d sheet analysis.
B. Strata physical and chemical properties
a. Density; b. Cation exchange capacity; c. content of soluble salts; d. adsorption isotherm experiments; e. surface area;
C. Indoor test way of borehole instability
a. Dispersion of mud shale evaluation test; b. Hydration performance test; c. Expanding performance test; d. Dielectric constant; e. Shale stability index; f. Triaxial stress test system; g. DSC downhole simulation device; h. Engineered high temperature and high pressure loss tester
3. Analysis of borehole instability
Essence of borehole instability is mechanical instability. When the wellbore stress suffered more than its own strength, will occurs wellbore instability. The reasons are complex, it can be summarized into three main aspects of mechanical factors, physical factors and chemical engineering technology measures.

To be continued...

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