Kemira Chemicals, Inc.

Kemira Kemi Ab

Frank Schinkel

Carl Wilhelm Aften

Geoffrey Allen Monteith

Mona Ezzelarab

Walter Philip Watson

Richard Anthony Lalama

Cecilla Eva Maria Johansson

Ajse Sandqvist

Carolina Hanna Matilda Anderson

Carolina Hanna Matilda Andersson

Carolina Andersson

Cecilia Johansson

Lars-Inge Olsson

Markus Svensson

Caroline Wegner

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.

Well treatment fluid compositions and methods of use that include a delayed release percarbonate formulation

The invention provides a process for the production of a granule of a coated oxidizing compound which granule has good delayed release properties, said process comprising a) providing cores of an oxidizing compound produced by fluidized bed spray granulation, b) spraying on the oxidizing compound cores an aqueous solution of metal sili-cate in a fluidized bed, said aqueous solution comprising at least 15% by weight metal silicate, and c) drying to form a metal silicate coating layer on the oxidizing compound core, provided that the amount of metal silicate coating layer is at least 8%, preferably at least 10% by weight based on the total weight of the granule. The invention also provides such granule and well treatment fluids including such granule, and processes for use.

Process for the production of a granule of a coated oxidizing compound such granule and uses of the granule

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Hamburg, Germany

Frank Schinkel