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OwnerRaymond J. Tibbles, Mehmet Parlar +6inventors
InventorsRaymond J. Tibbles, Mehmet Parlar, Frank F. Chang, Diankui Fu, Jonathan Mark Davison, Elizabeth W.A. Morris, Antje M. Wierenga, Palathinkara S. Vinod
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The Invention relates to novel fluids and techniques to optimize/enhance the production of hydrocarbon from subterranean formations (e.g., “completion fluids”), in particular, fluids and techniques are disclosed and claimed which remove wellbore damage and near-wellbore damage in the form of coating formed from drilling and production-related operations (“filtercake”); the techniques can be applied either by themselves or in conjunction with other completion operations, such as gravel packing; preferred embodiments are chelating agent and enzyme systems in a viscoelastic surfactant (VES) matrix.
A well completion fluid for breaking filtercake having substantial calcite and starch content, said fluid comprising a chelating agent and an enzyme, wherein said chelating agent is present in a quantity effective to promote the dissolution of calcium carbonate and said enzyme is suitable for dissolving starch.
Dependencies are inferred from the claim text.