HRP Oil-Fluids Liquid Viscosifier | SLB


Oil-fluids liquid viscosifier

Schlumberger Oilfield Services

HRP viscosifier provides elevated yield point and gel strengths with minimal increase in plastic viscosity for all MEGADRIL, VERSA, and NOVA drilling fluid systems.

It is frequently used to increase the hole-cleaning capacity for sweeps in directional or horizontal wells and for gelling freshly prepared muds being transported to the well. HRP viscosifier is a versatile additive that works in conjunction with organophilic clay and can be used to minimize the amount of clay in a particular formulation. Time and shear or chemical treatments can be used to later thin a fluid treated with HRP viscosifier. The product increases low-shear-rate viscosity [LSRV] to improve shear thinning and thixotropic characteristics.

Typical Physical Properties  
Physical appearance Straw-colored liquid
Specific gravity 1.01
Flash point >200 degF [93 degC] (Pensky–Martens closed cup)
Pour point 40 degF [4 degC]


HRP viscosifier can be utilized to provide suspension in freshly prepared fluids under conditions where insufficient shear and temperature at the mixing plant do not allow the other viscosifiers in the formulation to yield. It will provide a satisfactory yield point and gel structure to support weight material with a minimal concentration of organophilic clay such as VG-69 clay. This prevents excessive amounts of organophilic clay from being used which could lead to undesirable high viscosities once the mud is displaced into the well.

The recommended treatment for the initial makeup of new fluids is 1 to 4 lbm/bbl [2.85 to 11.4 kg/m3] of HRP viscosifier in combination with 4 to 12 lbm/ bbl [11.4 to 34.2 kg/m3] of organophilic clay, depending on the desired rheology. HRP viscosifier works with organophilic clay to develop viscosity. This viscosity will diminish with high shear and time, so treatments will be needed on a regular basis.

HRP viscosifier may be used in existing systems to provide increased yield point and gel strengths for improved hole cleaning and weight material suspension. For treatments to an existing fluid, 0.25 to 2 lbm/bbl [0.71 to 5.7 kg/m3] of HRP viscosifier is recommended to increase yield point and gel strength. It can be used for viscous sweeps or for spacer fluids where thickened oil mud is needed to separate two fluids during a displacement. The recommended concentration for sweeps and thickened oil mud spacers is 0.25 to 1 lbm/bbl [0.71 to 2.85 kg/m3].


  • Functions in all nonaqueous drilling fluid 
  • Enhances the performance of organophilic clay under initial, low-temperature mixing conditions resulting in improved yield point and gel structure
  • Quickly develops increased gel structures providing a thixotropic fluid
  • Does not viscosify the liquid phase but performs by maximizing the thixotropy of fluids which contain organophilic clay
  • Versatile gelling agent which can be reversed [thinned] with chemical treatments or with shear and time
  • Reduces high-temperature, high-pressure fluid loss and improves emulsion stability
  • Reduced effectiveness at temperatures >200 degF [93 degC]


  • Should not be added to an oil-based mud unless the system contains organophilic clay or oil-wet active drill solids

Toxicity and handling

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

Packaging and storage

HRP viscosifier is packaged in 5-galUS [18.9-L] cans and 55-galUS [208-L] drums. 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.