Polymer-Free Fluid for Gravel Packing and Mudcake Cleanup

The Choice for Simultaneous Gravel Packing and Filtercake Cleanup

ClearPAC gravel-packing fluids are water-base systems composed of a viscoelastic surfactant (VES) and a brine. Low friction pressure and compatibility with enzyme and chelating agents make ClearPAC MS surfactant the choice for simultaneous gravel packing and filtercake cleanup. With complete viscosity breakdown on contact with most crude oils and no damaging polymeric residues, ClearPAC MS surfactant has high retained permeability characteristics.

ClearPAC MS fluid is ideal for gravel packing long horizontal intervals with the Alternate Path® technique. The fluid system overcomes density and temperature limitations, incorporates a chelating agent, and is compatible with potassium chloride, sodium bromide, and sodium chloride. The temperature limit depends upon brine type and density, and this surfactant can be formulated at densities to 11.6 ppg [1.39 sg] with a temperature stability approaching 250 degF [121 degC]. Compatible with chelating agent solutions U106, U820, and U821, ClearPAC MS surfactant can be used with enzyme breaker J503. The fluids can be either batch mixed or continuously mixed.

ClearPAC MS fluids require surfactant J559 for gelling and chelating agent U820 for cogelling. Incorporating chelating agent solution into the gravel carrier allows simultaneous gravel packing and cake cleanup where removal of calcium carbonate bridging-weighting agents is required. In openhole completions drilled with either water-base reservoir drilling fluids or a reversible synthetic or oil-base reservoir drilling fluid such as the FAZEPRO™ system, ClearPAC MS fluids are ideal.

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