Acid dissolvable cements and methods of using the same
First Claim
Patent Images
1. A method for controlling the volume change of a cement composition in a desired location comprising the steps of:
- forming a cement composition, which upon curing is rapidly dissolved in acid, said composition consisting essentially of;
water;
a metal halide or sulfate consisting essentially of at least one of magnesium, aluminum or zinc halides or sulfates and mixtures thereof;
a metal oxide consisting essentially of at least one of magnesium, aluminum or zinc oxides or mixtures thereof; and
a metal carbonate in an effective amount to control volume change of said cement composition consisting essentially of at least one of calcium or barium carbonate or mixtures thereof;
introducing said cement composition into said location to be cemented; and
allowing said cement composition to cure into a solid mass in said location.
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Abstract
Cement compositions which upon curing have high compressive strengths and are rapidly dissolved in acids are provided comprised of water, a metal halide or sulfate selected from the group consisting of magnesium, aluminum and zinc halides and sulfates, a metal oxide selected from the group consisting of magnesium, aluminum and zinc oxides and a metal carbonate selected from the group consisting of calcium and barium carbonates. Methods of using the cement compositions are also provided.
75 Citations
67 Claims
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1. A method for controlling the volume change of a cement composition in a desired location comprising the steps of:
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forming a cement composition, which upon curing is rapidly dissolved in acid, said composition consisting essentially of; water; a metal halide or sulfate consisting essentially of at least one of magnesium, aluminum or zinc halides or sulfates and mixtures thereof; a metal oxide consisting essentially of at least one of magnesium, aluminum or zinc oxides or mixtures thereof; and a metal carbonate in an effective amount to control volume change of said cement composition consisting essentially of at least one of calcium or barium carbonate or mixtures thereof; introducing said cement composition into said location to be cemented; and allowing said cement composition to cure into a solid mass in said location. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of placing an apparatus having fluid flow passages formed therein in a well bore and temporarily preventing fluids from entering said fluid flow passages during and after placement comprising the steps of;
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sealing said fluid flow passages in said apparatus prior to the placement thereof in said well bore with a cured acid dissolvable cement composition comprising; water; a metal halide or sulfate comprising at least one of magnesium, aluminum or zinc halides or sulfates and mixtures thereof; a metal oxide comprising at least one of magnesium, aluminum or zinc oxides or mixtures thereof; and a metal carbonate comprising at least one of calcium or barium carbonate or mixtures thereof; and placing said apparatus in said well bore at a desired location. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A method of placing an apparatus having fluid flow passages formed therein in a well bore and temporarily preventing fluids contained in said well from entering said fluid flow passages during and after placement of said apparatus comprising the steps of:
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sealing said fluid flow passages in said apparatus prior to the placement thereof with a cured, acid dissolvable cement composition consisting essentially of;
water;a metal halide or sulfate consisting essentially of at least one of magnesium, aluninum or zinc halides or sulfates and mixtures thereof present in an amount of about 15-40% by weight of said composition; and a metal oxide consisting essentially of at least one of magnesium, aluminum or zinc oxides or mixtures thereof present in an amount of about 15-60% by weight of said composition; and a metal carbonate consisting essentially of at least one of calcium or barium carbonate or mixtures thereof in an amount of about 10-60% by weight of said composition, whereby the amount of said calcium or barium carbonate or mixtures thereof used controls the change in volume of said cement composition during curing; and placing said apparatus in said well bore at a desired location therein. - View Dependent Claims (29, 30, 31)
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32. In a method of gravel packing a perforated screen placed in a well bore adjacent to a subterranean formation wherein a carrier liquid having gravel suspended therein is flowed along the outside of said screen to deposit said gravel around said screen, the method characterized by:
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temporarily sealing at least a portion of the perforations in said screen with an acid dissolvable, cured cement composition prior to placing said screen in said well bore, said composition consisting essentially of; water; a metal halide or sulfate selected from the group consisting essentially of magnesium, aluminum and zinc halides, sulfates and mixtures thereof; and a metal oxide selected from the group consisting essentially of magnesium, aluminum and zinc oxides and mixtures thereof; a metal carbonate selected from the group consisting essentially of calcium and barium carbonates and mixtures thereof, whereby the amount of said calcium or barium carbonate or mixtures thereof used controls the change in volume of said cement composition during curing; and packing gravel around said screen while said screen is sealed with said cement composition. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
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51. In a method of forming a fire resistant composition in a mold containing:
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water; a metal halide or sulfate comprising at least one of magnesium, aluminum or zinc halides or sulfates and mixtures thereof; and a metal oxide comprising at least one of magnesium, aluminum or zinc oxides or mixtures thereof; the method characterized by varying the expansion or contraction and fire resistance of said composition by controlling in said composition the quantity of a metal carbonate comprising at least one of calcium carbonate, barium carbonate or mixtures thereof; and
the method characterized by controlling the viscosity and mold release of said composition by varying in said composition the quantity of a hydratable polysaccharide comprising at least one of a hydratable cellulose derivative, a hydratable glactomannan gum and derivatives thereof;
a hydratable glucomannan gum, and mixtures thereof. - View Dependent Claims (52, 53, 54, 55, 56, 57, 58, 59)
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60. In a method of forming a solid cement mass containing:
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water; a metal halide or sulfate comprising at least one magnesium, aluminum or zinc halides or sulfates and mixtures thereof; and a metal oxide comprising at least one of magnesium aluminum or zinc oxides or mixtures thereof; the method characterized by varying the expansion or contaction of said solid cement mass by controlling in said cement mass the quantity of a metal carbonate comprising at least one of calcium carbonate, barium carbonate or mixtures thereof. - View Dependent Claims (61, 62, 63, 64, 65, 66, 67)
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Specification