Schlumberger

ClearFRAC HighPerm Polymer-Free Fracturing Fluid

Overview Library

Increases recovery in reservoirs with permeabilities higher than 10 mD

ClearFRAC HiPerm polymer-free fracturing fluid has been specially developed to maximize production and increase recovery in reservoirs with permeabilities higher than 10 mD and temperatures to 121 degC [250 degF]. This innovative viscoelastic surfactant (VES) system significantly enhances fracturing efficiency because it has a low friction pressure and excellent proppant-carrying capacity. It leaves the proppant pack undamaged, generates greater effective conductivity than polymer fluids do, and simplifies wellsite logistics because it is easy to mix and pump.

High retained conductivity

The polymer-free ClearFRAC HiPerm system can achieve tip screenout (TSO) and enable fracture width inflation to optimize fracture geometry. Retained conductivity is high, resulting in high flow rates, reduced drawdown, and less fines migration and emulsion formation during flowback.

Efficient proppant transport

The viscoelastic rheological behavior of the ClearFRAC HiPerm system enables it to suspend and transport proppant efficiently, even at lower than normal viscosities. That allows viscosity to be altered for better control of fracture geometry without compromising proppant transport.

Stimulation of producing intervals close to water zones

The system’s VES leakoff control minimizes the risk of a premature screenout, enabling access to high-permeability producing intervals in proximity to water zones.

Low friction pressure for stimulation through coiled tubing

The low friction pressure, relative to polymer systems, of the ClearFRAC HiPerm system improves CoilFRAC stimulation through coiled tubing (CT) by allowing higher pump rates at maximum treating pressure, or lower treating pressures at a given pump rate.

Immediate viscosity reduction following treatment

Viscosity of the ClearFRAC HiPerm system is reduced immediately when release (closure) disrupts the micelle structure. The reduction is triggered by dilution with formation brines, contact with the prepad and hydrocarbons, or addition of a chemical breaker. The breaker, which is designed to be run in the proppant-laden stages of the treatment, is easy to meter through the dry additive feeders of a POD programmable optimum density blender.

Unimpaired production

The ClearFRAC HiPerm system has no polymers to damage the proppant pack or obstruct microscreens. As a result, production is unimpaired.

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