Cement compositions containing metaphosphate and methods of use
First Claim
1. A method of cementing a treatment zone of a well, the method comprising the steps of:
- (A) forming a slag cement composition comprising;
(i) hydraulic cement consisting of slag cement having a ratio of CaO to SiO2 from about 0.5 to about 2.0;
(ii) a water-soluble metaphosphate in a concentration of at least 2.5% bwoc; and
(iii) water;
wherein the cement composition is substantially free of any alkali hydroxide, alkali carbonate, and alkali citrate; and
(B) introducing the cement composition into the well, wherein the thickening time of the cement composition comprising the water-soluble metaphosphate is less than the thickening time of a similar cement composition without the water-soluble metaphosphate.
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Abstract
In an embodiment, the cement compositions comprise: (i) hydraulic cement, wherein the hydraulic cement has a ratio of CaO to SiO2 in the range of 2.0 to 4.0; and (ii) a water-soluble metaphosphate in a concentration of at least 2.5% bwoc. In another embodiment, the cement compositions comprise: (i) hydraulic cement, wherein the hydraulic cement has a ratio of CaO to SiO2 of less than 2.0; and (ii) a water-soluble metaphosphate; wherein any alkali nitrate is in a concentration of less than 2% bwoc; and wherein any alkali hydroxide, alkali carbonate, or alkali citrate is in a concentration of less than 0.2% bwoc. Methods of cementing in a well comprising forming either of such cement compositions and introducing it into the well are provided.
30 Citations
17 Claims
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1. A method of cementing a treatment zone of a well, the method comprising the steps of:
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(A) forming a slag cement composition comprising; (i) hydraulic cement consisting of slag cement having a ratio of CaO to SiO2 from about 0.5 to about 2.0; (ii) a water-soluble metaphosphate in a concentration of at least 2.5% bwoc; and (iii) water; wherein the cement composition is substantially free of any alkali hydroxide, alkali carbonate, and alkali citrate; and (B) introducing the cement composition into the well, wherein the thickening time of the cement composition comprising the water-soluble metaphosphate is less than the thickening time of a similar cement composition without the water-soluble metaphosphate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of cementing a treatment zone of a well, the method comprising the steps of:
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(A) forming a slag cement composition comprising; (i) hydraulic cement consisting of slag cement having a ratio of CaO to SiO2 from about 0.5 to about 2.0; (ii) a water-soluble metaphosphate in a concentration of at least 2.5% bwoc; (iii) water; and (iv) a retarder consisting of a copolymer of acrylic acid, a lignosulfonate, or any combination thereof; wherein the cement composition is substantially free of any alkali hydroxide, alkali carbonate, and alkali citrate; and (B) introducing the cement composition into the well. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification