The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 01, 2010
Filed:
Dec. 17, 2004
Composition of base fluid and polymeric dispersing agent-absorbed polymer-coated colloidal particles
Andrew J Bradbury, Banchovy, GB;
Christopher A. Sawdon, Biscovey, GB;
Sonny Clary, Independence, LA (US);
William M Reid, Tomball, TX (US);
Tom Heinz, Katy, TX (US);
Andrew J Bradbury, Banchovy, GB;
Christopher A. Sawdon, Biscovey, GB;
Sonny Clary, Independence, LA (US);
William M Reid, Tomball, TX (US);
Tom Heinz, Katy, TX (US);
M-I L.L.C., Houston, TX (US);
Abstract
A method of controlling the pressure of a casing annulus in a subterranean well that includes injecting into the casing annulus a composition including a base fluid and a polymer coated colloidal solid material. The polymer coated colloidal solid material includes: a solid particle having an weight average particle diameter (d) of less than two microns, and a polymeric dispersing agent coated onto the surface of the solid particle during the cominution (i.e. grinding) process utilized to make the colloidal particles. The polymeric dispersing agent may be a water soluble polymer having a molecular weight of at least 2000 Daltons. The solid particulate material may be selected from materials having of specific gravity of at least 2.68 and preferably the solid particulate material may be selected from barium sulfate (barite), calcium carbonate, dolomite, ilmenite, hematite, olivine, siderite, strontium sulfate, combinations and mixtures of these and other similar solids that should be apparent to one of skill in the art.