Composition and method for recovering lost circulation and sealing earth boreholes and cavities
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United States of America Patent
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Aug 22, 2000
Grant Date -
N/A
app pub date -
Feb 5, 1998
filing date -
Feb 5, 1998
priority date (Note) -
Expired
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Abstract
Granular sodium bentonite particles in the size range of 8 mesh to 20 mesh, preferably in the size range of 8 mesh to 14 mesh, are coated with a solution of a copolymer of polyacrylamide and polyacrylate (PHPA) in a liquid emulsion form, including mineral oil as a carrier fluid, in proportions of 67% and 33%, by weight, respectively. The coated particles are mixed with water in proportions of 17-30 gallons, preferably 28 gallons, of water to each 50 pounds of coated particles to form a slurry, which is then pumped into an earth borehole to seal, gout or plug the borehole.
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