Main Drilling Fluid Types in the Chinese Market (II)
7) Gypsum drilling fluid Basic components: gypsum, SMC, SMP, SMT, FCLS, etc. Features: By use of the common ion effect, add gypsum to inhibit the gypsum dissolution in formation. 8) MMH drilling fluid Basic components: bentonite, mixed metal hydroxides (MMH), filtrate reducer and viscosity reducer Features: MMH can provide a unique rheological property and owns the strong ability of inhibiting the formation hydration dispersion; meanwhile, use filtrate reducer, which does not destroy MMH-clay complex structure, to control filtrate loss. 9) Potassium-silicon-based drilling fluid Basic components: KPAM, silicon stabilizer, silicon thinner, GKHm, SMP, and sulfonated asphalt products Features: use silicon to stabilize shale and reduce the water wettability of formation, with a strong inhibitiv
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