掘削液・マッド添加剤

High-specific-gravity (~4.2) inert weighting agent that raises mud density to balance formation pressure and prevent influx/blowouts; the core mud weight-up material. (source on demand)

Sodium montmorillonite clay that hydrates and swells to build suspension viscosity and lay down a low-permeability filter cake that limits fluid loss into the formation

Anionic cellulose polymer that reduces API filtration/fluid loss and supplies viscosity in water-based muds without heavy solids loading

K+ ions exchange into swelling-clay interlayers to suppress shale hydration and stabilize the wellbore in reactive formations. (source on demand)

Microbial polysaccharide that gives strong shear-thinning, low-end rheology for cuttings suspension and hole cleaning in low-solids and brine muds. (source on demand)

Densifies the brine phase and provides divalent-ion inhibition that helps stabilize cuttings and reactive clays in calcium-based mud systems

Genuine drilling/completion fluid additive: guar derivative viscosifier and fluid-loss reducer that builds shear-thinning rheology for cuttings suspension in water-based muds and completion/workover fluids, alongside xanthan/CMC. CAS correct.

Strong genuine fit: AMPS-based polymer is a standard high-temperature filtration/fluid-loss control additive in WBM, thermally stable where cellulosics (CMC/PAC) and starch degrade. CAS matches poly(2-acrylamido-2-methylpropanesulfonic acid); description accurate.