Sorel cement with a hydrophobic modifier
A variety of methods, systems, and compositions are disclosed, including, in one embodiment, a cement composition comprising an alkaline earth metal oxide, a soluble salt, a water-proofing agent comprising a divalent cation carbonate coated with fatty acid, and water. In other embodiments, the cement composition is introduced and allowed to set in a subterranean formation.
1 . A cement composition comprising:
an alkaline earth metal oxide;
a soluble salt;
a water-proofing agent comprising a divalent cation carbonate coated with fatty acid;
at least one viscosifier selected from a group consisting of xanthan, diutan, hydroxy propyl guar, carboxy methyl hydroxy propyl guar, and any combinations thereof; and
water, wherein the alkaline earth metal oxide and the soluble salt form a settable cement composition.
2 . The cement composition of claim 1 , wherein the divalent cation carbonate comprises at least one divalent cation carbonate selected from a group consisting of calcium carbonate, magnesium carbonate, strontium carbonate, zinc carbonate, and any combination thereof.
3 . The cement composition of claim 1 , wherein the divalent cation carbonate comprises calcium carbonate.
4 . The cement composition of claim 1 , wherein the fatty acid comprises at least one fatty acid selected from a group consisting of butyric acid, caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid, behenic acid, lignoceric acid, cerotic acid, and any combination thereof.
5 . The cement composition of claim 1 , wherein the fatty acid comprises stearic acid.
6 . The cement composition of claim 1 , wherein the divalent cation carbonate coated with fatty acid comprises calcium carbonate coated with stearic acid.
7 . The cement composition of claim 1 , further comprising modified clay.
8 . The cement composition of claim 1 , wherein the alkaline earth metal oxide comprises magnesium oxide and the soluble salt comprises magnesium chloride.
9 . The cement composition of claim 1 , wherein the alkaline earth metal oxide is present in an amount of about 10% to about 50% by weight of the cement composition, wherein the soluble salt is present in an amount of about 10% to about 50% by weight of the cement composition, wherein the alkaline earth metal oxide is magnesium oxide, and wherein the soluble salt is magnesium chloride.
10 . The cement composition of claim 1 , wherein the cement composition has a metal oxide to soluble salt ratio of about 1:3 to about 3:1.
11 . The cement composition of claim 1 , wherein the cement composition has a metal oxide to soluble salt ratio of about 1:2 to about 2:1.
12 . A method comprising:
introducing a cement composition comprising:
an alkaline earth metal oxide;
a soluble salt;
a water-proofing agent comprising a divalent cation carbonate coated with fatty acid;
at least one viscosifier selected from a group consisting of xanthan, diutan, hydroxy propyl guar, carboxy methyl hydroxy propyl guar, and any combinations thereof; and
water; and
allowing the cement composition to set in a subterranean formation, wherein the alkaline earth metal oxide and the soluble salt form a settable cement composition.
13 . The method of claim 12 , wherein the cement composition is introduced into a lost circulation zone in the subterranean formation and is allowed to set to seal the lost circulation zone.
14 . The method of claim 12 , wherein the cement composition is introduced into a water-producing zone in the subterranean formation and is allowed to seal the water-producing zone.
15 . The method of claim 12 , wherein the cement composition sets to seal off one or more subterranean zones.
16 . The method of claim 12 , wherein the divalent cation carbonate comprises at least one divalent cation carbonate selected from a group consisting of calcium carbonate, magnesium carbonate, strontium carbonate, zinc carbonate, and any combination thereof.
17 . The method of claim 12 , wherein the divalent cation carbonate comprises calcium carbonate.
18 . The method of claim 12 , wherein the fatty acid comprises at least one fatty acid selected from a group consisting of butyric acid, caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid, behenic acid, lignoceric acid, cerotic acid, and any combination thereof.
19 . The method of claim 12 , wherein the fatty acid comprises stearic acid.
20 . The method of claim 12 , wherein the divalent cation carbonate coated with fatty acid comprises calcium carbonate coated with stearic acid.