Inventors:
Mona Ezzelarab - Lund, SE
Carl Aften - Marietta GA, US
Carolina Andersson - Ängelholm, SE
Cecilia Johansson - Helsinborg, SE
Richard Lalama - Canton GA, US
Geoffrey Monteith - Midland GA, US
Lars-Inge Olsson - Ekeby, SE
Ajse Sandqvist - Helsingborg, SE
Frank Schinkel - Hamburg, DE
Markus Svensson - Malmö, SE
Walter Watson - Kennesaw GA, US
Caroline Wegner - Bjuv, SE
Assignee:
Kemira Kemi AB - Helsinborg
Kemira Chemicals, Inc. - Kennesaw GA
International Classification:
E21B 21/00
E21B 43/00
E21B 43/26
C09K 8/68
C09K 8/60
C09K 8/74
C09K 8/504
B05D 7/00
B32B 5/16
US Classification:
507277, 507211, 507219, 507225, 507230, 507269, 507271, 507276, 1663051, 1663081, 1663083, 427213, 428403, 428404
Abstract:
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.