专利名称：Composition of base fluid and polymeric
dispersing agent-absorbed polymer-coatedcolloidal particles
发明人：Andrew J Bradbury,Christopher A.
Sawdon,Sonny Clary,William M Reid,TomHeinz
申请号：US11015124申请日：20041217公开号：US07727939B2公开日：20100601
摘要：A method of controlling the pressure of a casing annulus in a subterranean wellthat includes injecting into the casing annulus a composition including a base fluid and apolymer coated colloidal solid material. The polymer coated colloidal solid materialincludes: a solid particle having an weight average particle diameter (d) of less than twomicrons, and a polymeric dispersing agent coated onto the surface of the solid particleduring the cominution (i.e. grinding) process utilized to make the colloidal particles. Thepolymeric dispersing agent may be a water soluble polymer having a molecular weight ofat least 2000 Daltons. The solid particulate material may be selected from materialshaving of specific gravity of at least 2.68 and preferably the solid particulate material maybe selected from barium sulfate (barite), calcium carbonate, dolomite, ilmenite, hematite,olivine, siderite, strontium sulfate, combinations and mixtures of these and other similarsolids that should be apparent to one of skill in the art.
申请人：Andrew J Bradbury,Christopher A. Sawdon,Sonny Clary,William M Reid,Tom
Heinz
地址：Banchovy GB,Biscovey GB,Independence LA US,Tomball TX US,Katy TX US
国籍：GB,GB,US,US,US
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