VeraVis Viscosifier and Fluid Loss Additive | Schlumberger

VeraVis

Branched synthetic polymer viscosifier and fluid loss additive

VeraVis branched synthetic polymer viscosifier and fluid loss additive is the primary viscosifier for the VeraTherm high-temperature water-based drilling fluid. It also provides fluid loss control and helps produce a thin, ultralow-permeability filtercake. This additive is designed to provide optimal drilling and has the ability to perform extended-logging operations in wells with bottomhole temperature exceeding 300 degF [149 degC].

Unlike most conventional synthetic polymers, VeraVis additive exhibits an excellent rheological profile with elevated low-end readings (6 rpm, 3 rpm, and low-shear-rate viscosity) that are essential for optimal hole cleaning in directional drilling and coiled tubing applications.

The additive is compatible with most oilfield brines, including sodium chloride, sodium bromide, calcium chloride, calcium bromide, zinc bromide, and formate blends. However, as brines approach saturation, functionality may be impacted; pilot test for higher-salinity brine requirements.

Because VeraVis additive acts as the sole brine viscosifier and primary fluid-loss control additive, it is typically applied at concentrations between 5 and 12 lbm/bbl [14.26 to 34.24 kg/m3]. Concentrations will vary depending on the base brine, salinity, and application. Pilot testing and proper design procedures should be used to determine the optimal formulation.

Typical Physical Properties
Physical appearance Powder
Color White
Specific gravity 1.26 to 1.27 sg

Limitations

Efficiency may be compromised as base brine approaches saturation. A pilot test is required. This additive requires the use of shale inhibitor and proper solids control equipment to minimize the effect of reactive solids.

Toxicity and handling

Bioassay information is available on request. Handle as an industrial chemical, wearing protective equipment and observing the precautions described in the safety data sheet.

Packaging and storage

VeraVis additive is packaged in 22-lbm [10-kg] bags. Store in a dry, well-ventilated area. Keep container closed. Keep away from heat, sparks, and flames. Store away from incompatibles. Follow safe warehousing practices regarding palletizing, banding, shrink-wrapping, and stacking.

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