Abstract

CHAVEZ CHAMORRO, Andrea Paola et al. Theobroma cacao extracts as a clay inhibitor and their impact on polymeric water-based drilling fluid. Perfiles [online]. 2024, vol.1, n.31, pp.40-53. ISSN 2477-9105.  https://doi.org/10.47187/perf.v1i31.272.

The stability of the well depends on the control of clay hydration in the geological formations; the cocoa parts were evaluated as an inhibitory additive in drilling fluids, replacing glycol. an additive in drilling fluids, replacing glycol (a commercial clay inhibitor).

The experimental scientific method was used to evaluate the inhibitory property (linear swelling reference bentonite in fresh water) of the different concentrations of cocoa fruit and glycol, selecting the lowest percentages. Five drilling fluids were formulated at 3 lbm/bbl of slurry. 3.6 and 9 lbm/bbl of cocoa shell and a fluid with 3 lbm/bbl of glycol corresponding to the standard fluid; additionally, chemical tests were determined in the fluid filtration.

The evaluation of drilling fluid formulations with natural inhibitors at 3 lbm/bbl obtained linear swelling of the pulp (41.4%) and shell (56.35%) compared to the commercial inhibitor glycol (45.07%); drilling fluid filtrate that is evaluated through calcium content is 2080 mg/l for pulp.

Cocoa pulp has better inhibitory properties than the cocoa shell and seed, making it work as a clay inhibitor. However, when incorporated into the drilling fluid, the high calcium content interferes with the physical and chemical properties required by the drilling fluid.

Keywords : Inhibitor; drilling fluid; clay hydration; Theobroma cacao L; calcium; linear swelling.

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