UNI-VIS-byopolymer is used for drilling in non-cohesive soil (sand, gravel, etc.) for the purpose of increasing rheological characteristics (carrying capacity, gel strength). On high complexity job sites preferably to use it in combination with UNI-PAC;

UNI-VIS is a dispersible, non-clarified, high-molecular­ weight biopolymer used for increasing viscosity in water-base base drilling fluid systems.

Small quantities provide viscosity and weight material suspension for all water-base mud systems. Uni-Vos biopolymer has the unique ability to produce a fluid that is highly shear-thinning and thixotropic.

Typical Physical Properties

Physical appearance ……………………………….Cream-to-tan powder

Specific gravity………………………………………………………………..1.5

Bulk density…………………………………………..50 lb/ft3 (800 kg/m3)


The primary function of Uni-Vis biopolymer is to increase viscosity for cuttings transport and suspension. It performs effectively in all water-based fluids, ranging from highly weighted to low-solids systems. This includes freshwater, seawater, salt and heavy-brine fluid systems.

The amount of Uni-Vis required depends upon the desired viscosity. Normal concentrations range from 0.25 to 2 lb/bbl (0.71 to 5.7 kg/m3) for most mud systems. Special fluids and difficult hole-cleaning conditions can require higher concentrations of, up to 41b/bbl (11.4 kg/m3).

The addition of salt, antioxidant and thermal stabilizers improve temperature stability in fluids from 250 to >280° F (121 to >138° C). Specially formulated systems have been used at temperatures of 400° F (204° C). Uni-Vis is subject to bacterial degradation, and treatments with a biocide is recommended to prevent fermentation.


  • Highly effective viscosifier; with minimal treatments producing significant results
  • Shear-thinning rheological profile for improved hydraulics
  • Minimum frictional pressure losses for additional hydraulic horsepower at the bit and low, high shear-rate viscosity for maximum penetration rates
  • iscous laminar flow in the annulus for improved wellbore stability with maximum hole-cleaning and suspension capacity
  • Mixes easily


  • Trivalent ions such as chromium and iron can cause biopolymer precipitation and loss of viscosity or crosslinking
  • Intolerant of high-pH or high-calcium-ion conditions
  • Uni-Vis systems should be pretreated with either sodium bicarbonate or SAPP and citric acid prior to drilling cement
  • Subject to bacterial degradation, a biocide should be used to prevent fermentation
  • The slightly anionic nature of Uni-Vis biopolymer requires special mixing procedures when combined with cationic materials

Toxicity and Handling
Bioassay information is available upon request. Handle as an industrial chemical, wearing protective equipment and observing the precautions described in the Material Safety Data Sheet (MSDS).

Store at room temperature in a dry, well-ventilated area. Keep in original container. Keep container closed. Store away from incompatible

Universal HDD believes the specifications on this web ste to be correct at the time of publishing. However, specifications, standard equipment, options and dimensions are subject to change without notice. Some equipment may be unavailable when your machine is built. Please ask your adviser for list concerning current availability of standard and optional equipment and tooling, and verify that your machine will include the equipment you ordered. Machines in this brochure are shown with optional equipment. While Universal HDD makes diligent efforts to provide accurate information in this brochure, there is no guarantee or warranty of accuracy. This brochure shall not be used or relied upon as substitute for information that is available from your Universal HDD center. Further information can be obtained from your authorized Universal HDD dealer or www.unihdd.com.