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composition, system for monitoring hydrocarbon reservoir, and methods for tracing fluid flow from a hydrocarbon reservoir and for providing controlled slow release of an oilfield chemical to a hydrocarbon well or reservoir
composition, system for monitoring hydrocarbon reservoir, and methods for tracing fluid flow from a hydrocarbon reservoir and for providing controlled slow release of an oilfield chemical to a hydrocarbon well or reservoir
Compositions containing a mixture of microcapsules (1, 10, 11, 13, 14, 15) and a bulk polymer, wherein the microcapsules have an oilfield chemical contained within the microcapsules, are described. Microcapsules may be present in a variety of configurations. The microcapsules contain a core (2, 12) or a microarray (7) containing the chemicals from the oilfield. the core or microarray may be surrounded by one or more polymeric shells (3), where each shell contains at least one polymer that affects the release of the oilfield chemical from the composition. The compositions provide for the sustained release of an oilfield chemical to fluid in an oilfield reservoir over long periods of time. Methods for making the compositions and articles containing the compositions are described. Methods for tracing fluid movement in a hydrocarbon reservoir using the compositions, and methods for providing for sustained release of chemicals from the oilfield are also described.
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