4.5 Article

Preparation and Swelling Inhibition of Mixed Metal Hydroxide to Bentonite Clay

Journal

MINERALS
Volume 12, Issue 4, Pages -

Publisher

MDPI
DOI: 10.3390/min12040459

Keywords

mixed metal hydroxide; bentonite clay; swelling; inhibitors; montmorillonite; drilling fluid

Funding

  1. Open Fund of Shaanxi Key Laboratory of Carbon Dioxide Storage and Enhanced Oil Recovery [YJSYZX20SKF0008]
  2. Key Scientific Research Program of Shaanxi Provincial Department of Education [21JY035]
  3. Youth Innovation Team of Shaanxi University
  4. Slovak Research and Development Agency [APVV-18-0075]
  5. Slovak Grant Agency VEGA [2/0166/21]

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In this study, a mixed metal hydroxide (MMH) was prepared and its inhibitory effect on clay swelling and high-temperature resistance in water-based drilling fluid were evaluated.
In this paper, mixed metal hydroxide (MMH) was prepared via MgCl2 and AlCl3 by the co-precipitation method and characterized by XRD, TGA laser and particle size analysis. The inhibitory effect of MMH on the swelling of clay was evaluated by linear expansion, mud ball, laser particle size analysis, X-ray diffraction analysis and TGA. The linear expansion experiment showed that MMH with a ratio of Mg:Al = 3:1 displayed a strong inhibitory effect on bentonite expansion when 0.3% MMH was added to the drilling fluid, demonstrating better inhibition than 4.0% KCl. Within 48 h, only a few cracks were visible on the mud ball surface in the 0.3% MMH suspension, which indicates that MMH can inhibit wet bentonite for deep hydration. X-ray diffraction and particle size analyses of bentonite were conducted before and after MMH was added to illustrate the inhibition. MMH also displayed high temperature resistance in water-based drilling fluid as a shear strength-improving agent, and its dynamic plastic ratio and shear force were stable after aging at 200 degrees C for 16 h.

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