A large number of polymers is available worldwide under many different trade names. The base products are normally Cellulose (CMC, carbocel etc.) or Starch (flocgel, stabilose). These polymers affect both the fluid loss and the viscosity of the mud. LV (low viscosity) versions are generally designed to lower the fluid loss without major effects on viscosity. HV (high viscosity) versions have a major effect on the viscosity (PV) and generally reduce the fluid loss as well. HV polymers should be used only when high viscosity is required.

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