Water based compositions for sealing subterranean zones and methods
First Claim
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1. A composition for sealing a subterranean zone to prevent the uncontrolled flow of fluids into or from the zone consisting essentially of:
- water present in an amount in the range of from about 6% to about 50% by weight of said composition;
an aqueous rubber latex present in an amount in the range of from about 33% to about 67% by weight of said composition;
an organophillic clay present in an amount in the range of from about 13% to about 22% by weight of said composition;
sodium carbonate present in an amount in the range of from about 2.7% to about 4.4% by weight of said composition; and
a biopolymer present in an amount in the range of from about 0.1% to about 0.2% by weight of said composition.
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Abstract
The present invention provides water based compositions and methods of using the compositions for sealing subterranean zones. The compositions are basically comprised of water, an aqueous rubber latex, an organophillic clay and sodium carbonate.
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Citations
27 Claims
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1. A composition for sealing a subterranean zone to prevent the uncontrolled flow of fluids into or from the zone consisting essentially of:
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water present in an amount in the range of from about 6% to about 50% by weight of said composition;
an aqueous rubber latex present in an amount in the range of from about 33% to about 67% by weight of said composition;
an organophillic clay present in an amount in the range of from about 13% to about 22% by weight of said composition;
sodium carbonate present in an amount in the range of from about 2.7% to about 4.4% by weight of said composition; and
a biopolymer present in an amount in the range of from about 0.1% to about 0.2% by weight of said composition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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4. The composition of claim 1 wherein said organophillic clay is an alkyl quaternary ammonium bentonite clay.
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5. The composition of claim 1 which includes a dispersing agent present in an amount in the range of from about 0.35% to about 0.55% by weight of said composition.
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6. The composition of claim 5 wherein said dispersing agent is the condensation reaction product of acetone, formaldehyde and sodium sulfite.
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7. The composition of claim 1 wherein said biopolymer is welan gum.
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8. The composition of claim 1 which includes a defoaming agent present in an amount in the range of from about 0.4% to about 1.8% by weight of said composition.
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9. The composition of claim 8 wherein said defoaming agent is comprised of polydimethylsiloxane.
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10. The composition of claim 1 which includes one or more components selected from the group of latex stabilizers, dispersing agents, defoaming agents, foaming agents, emulsion breakers, fillers and rubber vulcanizing agents.
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11. A composition for sealing a subterranean zone to prevent the uncontrolled flow of fluids into or from the zone consisting essentially of:
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water present in an amount in the range of from about 30% to about 42% by weight of said composition;
an aqueous styrene/butadiene latex present in an amount in the range of from about 39% to about 47% by weight of said composition;
an alkyl quaternary ammonium bentonite clay present in an amount in the range of from about 16% to about 19% by weight of said composition;
sodium carbonate present in an amount in the range of from about 3.3% to about 3.7% by weight of said composition; and
welan gum present in an amount in the range of from about 0.1% to about 0.2% by weight of said composition. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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19. The composition of claim 11 which includes one or more components selected from the group of latex stabilizers, dispersing agents, defoaming agents, foaming agents, emulsion breakers, fillers and rubber vulcanizing agents.
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20. A method of sealing a subterranean zone to prevent the uncontrolled flow of fluids into or from the zone comprising the steps of:
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preparing a subterranean zone sealing composition consisting essentially of water, an aqueous rubber latex, an organophillic clay and sodium carbonate; and
introducing said sealing composition into said zone. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
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Specification