E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
31/23
E21B 33/138 (2006.01) C09K 8/24 (2006.01) C09K 8/502 (2006.01) C09K 8/516 (2006.01)
Patent
CA 1241828
ABSTRACT A shear thickening composition which comprises a water-in-oil emulsion having dispersed in the continuous, oily phase thereof, hydratable, water-expandable clay, wherein said oily phase has an amine, preferably polyamine derivative surfactant dissolved therein and the dispersed aqueous phase comprises an aqueous solution of a polyacrylamide and polycarboxylic acid, preferably polyacrylic acid. In the instance wherein the dispersed aqueous phase includes the polyacrylic acid, the pH of the phase is preferably not more than 4.5, but where the polycarboxylic acid is present, the pH is preferably acidic or less than 7. These compositions are useful as well control fluids and may be used in deep wells. A process for plugging porous earth formations is also disclosed wherein these compositions are pumped down a well bore to the site of the formation desired to be plugged and subjecting the shear-thickening fluid to high shear which forms a paste to plug the formation.
434862
Calcavecchio Peter
Drake Evelyn N.
Borden Ladner Gervais Llp
Exxon Research And Engineering Company
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