Composition for use in sealing a porous subterranean formation, and methods of making and using
First Claim
1. A composition for use in sealing a porous subterranean formation comprising a mixture of effective amounts of water swellable clay and a water-insoluble, water-absorbent, water-swellable polymer, both having an external coating consisting of an effective amount of a material capable of retarding the rate of penetration of water through the coating.
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Accused Products
Abstract
A composition for sealing porous subterranean formations comprises a mixture of a water-swellable clay and a water insoluble, water absorbent, water-swellable polymer, wherein the mixture is coated with a material that is resistant to penetration by water. The water penetration resistant material helps the delay the onset of swelling of the clay and polymer until it reaches the formations intended for sealing. Mixing the clay with the water-swellable polymer prior to coating assists in coating of the water-swellable polymer with the water penetration resistant material. The coated mixture can be suspended in an aqueous liquid, and then pumped into a subterranean cavity to seal porous formations therein.
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Citations
32 Claims
- 1. A composition for use in sealing a porous subterranean formation comprising a mixture of effective amounts of water swellable clay and a water-insoluble, water-absorbent, water-swellable polymer, both having an external coating consisting of an effective amount of a material capable of retarding the rate of penetration of water through the coating.
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11. A method of making a coated mixture for use in sealing a porous subterranean formation comprising:
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a) forming a dry mixture of an effective amount of a particulate water swellable clay with an effective amount of a particulate water insoluble, water absorbent, water swellable polymer; and
b) coating the clay and water-swellable polymer particles with an effective amount of a material capable of retarding the rate of water penetration through the coating to form the coated mixture. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 29, 30, 31, 32)
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Specification