ClearPAC Polymer-Free Viscoelastic Surfactant (VES) Gravel-Pack Fluids

Overview Library

Avoid formation damage and improve gravel-pack efficiency

ClearPAC polymer-free gravel-pack fluids are water-based fluids prepared by adding a viscoelastic surfactant to a completion brine; both monovalent and divalent brines with a wide range of densities can be used. Viscosity develops rapidly and is not prone to shear degradation. 

Achieve operational flexibility

With their tolerance to oil-based fluid contamination, ClearPAC fluids provide efficient gravel packing in wells drilled with oil-based or water-based mud. They are suitable for both batch and continuous mixing. 

A range of formulations enables you to optimize results for your application:

  • ClearPAC XD polymer-free VES gravel-pack fluid
  • ClearPAC HT polymer-free VES high-temperature gravel-pack fluid
  • ClearPAC DS polymer-free VES gravel-pack and mudcake-cleanup fluid.

Reduce surfactant concentration and friction pressure

The fluids provide superior gravel suspension performance and shear recovery at lower surfactant concentrations compared with other VES fluids. They also exhibit low friction pressure during pumping compared with polymer-based fluids, making them ideal for gravel packing long horizontal intervals with Alternate Path screens.

Eliminate breaker requirement for viscosity reduction

Unlike crosslinked-polymer-based fluids, ClearPAC fluids exhibit viscosity reduction on contact with crude oils or on dilution with brine. No breaker is required to reduce viscosity after the gravel-pack operation is complete.

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Temperature and Final Fluid Density Ranges for ClearPAC Fluids

ClearPAC polymer-free viscoelastic surfactant (VES) gravel-pack fluids
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Record Gravel-Pack Interval Saves a North Sea Operator USD 60 Million

The North Sea job established a new record for the world’s longest openhole gravel pack—4,347 ft from TD to casing shoe—using Alternate Path technology.
Integrated approach enables successful packing of 4,347 ft of open hole in a challenging environment with low fracture pressure, eliminating the need for a second well. Read case study