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• W2003078957 abstract "Abstract Fluid viscosity reduction is an important gauge of polymer degradation, and, although viscosity reduction does indicate that polymer degradation has occurred, reduced viscosity does not necessarily indicate that the proppant pack and the formation are undamaged. Polymer fragments which are broken from the gelled fluid no longer contribute significantly to fluid viscosity but may contribute to proppant pack and/or formation permeability damage, i.e. fragments may be stuck in pores and pore throats. Carbohydrate analysis of post-fracturing flowback fluids yields valuable information regarding the abundance of mobile polymer fragments which are recovered subsequent to fracture stimulation. Gel breaker efficiency is characterized based upon the size distribution of generated polymeric fragments from both linear and cross-linked guar based fracturing fluids. Previous studies have demonstrated that a correlation exists between formation rock permeability and the degree of damage resulting from residual polymer fragment deposition -the greater the formation rock permeability, the greater the degree of damage to the formation. In this study, results of core flow and fracture conductivity testing are presented in an effort to correlate clean up effectiveness to original rock and proppant pack permeability. Degraded and cross-linked low, near neutral, and high pH frac fluids were tested. In general, a greater percentage of regained permeability was noted for more severely (i.e. permeable) damaged rocks. Proppant pack studies showed a similar effect. Rocks tested in this study exhibited permeabilities from 3 md to over 2 darcies. Conductivity proppant pack baseline ranges were 250 to 500 darcies. Data yield a semiquantitative model of the extent of formation permeability and conductivity damage and clean up that can be expected based upon the original rock permeability. Laboratory carbohydrate content data are compared with fracture flowback data, and field case histories, as applicable, are discussed." @default.
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• W2003078957 date "1999-03-28" @default.
• W2003078957 modified "2023-09-25" @default.
• W2003078957 title "Relationship Between Polymeric Fragment Damage and Damage Removal and the Original Rock and Proppant Pack Permeability" @default.
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• W2003078957 doi "https://doi.org/10.2118/52128-ms" @default.
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