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US 8,501,670 B2Granted
Well treatment fluid compositions and methods of use that include a delayed release percarbonate formulation
AssigneeKemira Chemicals, Inc.
InventorsCarolina Hanna Matilda Andersson, Mona Ezzelarab, Cecilla Eva Maria Johansson, Carl Wilhelm Aften, Walter Philip Watson, Richard Anthony Lalama, Geoffrey Allen Monteith, Frank Schinkel
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Abstract
A well treatment fluid and method of use includes water, at least one hydratable polymer, an optional crosslinking agent, and a delayed release percarbonate formulation effective to reduce initial viscosity of the fluid after a period of time. Also disclosed are processes for fracturing a subterranean formation.
Claims11
A process for fracturing a subterranean formation comprising:
- injecting under pressure an aqueous hydraulic fluid having a first viscosity into a well bore, wherein the aqueous hydraulic fluid comprises water;
- at least one hydratable polymer;
- and sodium percarbonate granules having a delayed release coating of an inorganic material;
- forming fractures in the subterranean formation with the hydraulic fluid at the first viscosity and dissolving the delayed release coating to expose the sodium percarbonate to the water after a period of time;
- reacting the sodium percarbonate with the at least one hydratable polymer to decrease the first viscosity to a second viscosity;
- and
- recovering at least a portion of the hydraulic fluid having the second viscosity.
4 more elements
Dependencies are inferred from the claim text.