Earth boring – well treating – and oil field chemistry – Earth boring – Contains inorganic component other than water or clay
Reexamination Certificate
2004-12-17
2008-11-11
Metzmaier, Daniel S (Department: 1796)
Earth boring, well treating, and oil field chemistry
Earth boring
Contains inorganic component other than water or clay
C507S100000, C507S200000, C507S269000, C507S906000, C507S128000, C507S135000, C507S138000, C507S235000, C507S259000, C507S265000, C166S277000, C166S141000, C166S179000
Reexamination Certificate
active
07449431
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 (d50) of less than two microns, and a polymeric dispersing agent coated onto the surface of the solid particle during the comminution (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.
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Bradbury Andrew J
Clary Sonny
Heinz Tom
Reid William M
Sawdon Christopher A.
M-I L.L.C.
Metzmaier Daniel S
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