Methods of cementing and lassenite-containing cement compositions
Cement compositions and methods of making the same are provided. The composition comprises cement or lime, water and Lassenite, a pozzolanic strength retrogression inhibitor.
1. A method of cementing in a subterranean formation, comprising:
introducing a cement composition into a subterranean formation; and
allowing the cement composition to cure and develop compressive strength;
wherein the cement composition consists essentially of:
cement;
an aqueous fluid present in an amount from about 20% to about 80% by weight of the cement;
a pozzolan present in an amount from about 10% to about 40% by weight of the cement; and
a modifying additive selected from the group consisting of lime, weighting additives, and dispersants; and
wherein the pozzolan comprises a crystalline porous aluminosilicate and is a strength retrogression inhibitor; and
wherein the compressive strength of the cement composition is at least 50 psi three hours after curing at 190° F. and the compressive strength of the cement composition measured at 72 hours is greater than the compressive strength of the cement composition measured at 24 hours.
2. The method according to claim 1 , wherein the cement is selected from the group consisting of Portland cements, gypsum cements, high alumina content cements, slag cements, high magnesia content cements, shale cements, acid/base cements, fly ash cements, zeolite cement systems, kiln dust cement systems, microfine cements, metakaolin, and combinations thereof.
3. The method according to claim 1 , wherein the aqueous fluid is water selected from the group consisting of fresh water, brackish water, saltwater, and any combination thereof.
4. The method according to claim 3 , wherein the cement composition comprises water in an amount selected from about 28% to about 60% by weight of the cement, and from about 36% to about 66% by weight of the cement.
5. The method according to claim 1 , wherein the pozzolan comprises silicon dioxide (SiO 2 ) and aluminum oxide (Al 2 O 3 ).
6. The method according to claim 5 , wherein the silicon dioxide (SiO 2 ) and aluminum oxide (Al 2 O 3 ), comprise at least 80% by weight of the total oxide content of the pozzolan.
7. The method according to claim 5 , wherein the silicon dioxide (SiO 2 ) comprises from about 65% to about 75% by weight of the total oxide content of the pozzolan; and wherein the aluminum oxide (Al 2 O 3 ) comprises from about 10% to about 15% by weight of the total oxide content of the pozzolan.
8. The method according to claim 1 , wherein the cement composition develops a compressive strength of from about 3200 psi to about 3500 psi at about 24 hours after curing at 190° F.
9. The method according to claim 1 , wherein the cement composition develops compressive strength and the compressive strength increases by a factor of from about 5% to about 10% from about 24 hours to about 72 hours after cure.
10. A method of cementing in a subterranean formation, comprising:
introducing a cementitious composition into a subterranean formation, the cementitious composition consisting essentially of:
a crystalline porous aluminosilicate pozzolan comprising silicon dioxide (SiO 2 ) and aluminum oxide (Al 2 O 3 ), wherein silicon dioxide (SiO 2 ) and aluminum oxide (Al 2 O 3 ) are at least 80% by weight of the total oxide content of the pozzolan;
a calcium source present in an amount from about 15% to about 40% by weight of the pozzolan; and
an aqueous fluid; and
allowing the cementitious composition to cure and develop compressive strength;
wherein the pozzolan is a strength retrogression inhibitor; and
wherein the compressive strength of the cement composition measured at 72 hours is greater than the compressive strength of the cement composition measured at 24 hours.
11. The method according to claim 10 , wherein the silicon dioxide (SiO 2 ) comprises from about 65% to about 75% by weight of the total oxide content of the pozzolan; and wherein the aluminum oxide (Al 2 O 3 ) comprises from about 10% to about 15% by weight of the total oxide content of the pozzolan.
12. The method according to claim 10 , wherein the calcium source comprises lime and wherein the cementitious composition comprises lime in an amount of from about 15% to about 40% by weight of the pozzolan.
13. The method according to claim 10 , wherein the aqueous fluid is water selected from the group consisting of fresh water, brackish water, saltwater, and any combination thereof.
14. The method according to claim 10 , wherein the cementitious composition develops a compressive strength of from about 500 psi to about 700 psi at about 24 hours after curing at 180° F.