Method of cementing within a gas or oil well
AssigneeBaker Hughes Incorporated
InventorsEnrique Lopez, Dean P. Olson, Wayman Hunter
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Abstract
A cement mix for cementing the well casing within a wellbore which contains a synergistic blend of an alkali metasilicate and/or alkali silicate, aluminum silicate and either silica fume or micro silica quartz along with a Portland cement. The cement mix, when combined with mix water, may render a cementitious slurry having a density less than or equal to 11.5 pounds per gallon (ppg); the amount of mix water in the cementitious slurry being between from about 200 to about 560 percent by weight of cement (BWOC). The compressive strength of such cementitious slurries, when cured, is in excess of 100 psi, more typically in excess of 200 psi, after 72 hours at 130° F.
Claims31
A method of cementing within a gas or oil well penetrating a subterranean formation, the method comprising the steps of:
- pumping into the well a cementitious slurry comprising water and a cement mix, wherein the cement mix comprises:
- (a) a hydraulically-active cementitious material;
- (b) between from about 0.1 to about 8 weight percent, by weight of cementitious material (BWOC), of an alkali metasilicate and/or alkali silicate;
- (c) between from about 2 to about 10 percent BWOC of calcined kaolin or metakaolin;
- and
- (d) between from about 0.5 to about 55 percent BWOC of silica fume or micro silica quartz;
- and
- allowing the cementitious slurry to set.
A method of cementing within a gas or oil well penetrating a subterranean formation, the method comprising the steps of:
- pumping into the well a cementitious slurry comprising water and a cement mix, wherein the cement mix comprises:
- (a) a Class H Portland cement;
- (b) between from about 0.1 to about 8 weight percent, by weight of cementitious material (BWOC), of an alkali metasilicate and/or alkali silicate;
- (c) between from about 2 to about 10 percent BWOC of calcined kaolin or metakaolin;
- and
- (d) between from about 0.5 to about 55 percent BWOC of silica fume;
- and
- allowing the cementitious slurry to set.
A method of cementing within a gas or oil well penetrating a subterranean formation, the method comprising the steps of:
- pumping into the well a cementitious slurry comprising water and a cement mix, wherein the cement mix comprises:
- (a) a Class C Portland cement;
- (b) between from about 0.1 to about 8 weight percent, by weight of cementitious material (BWOC), of an alkali metasilicate and/or alkali silicate;
- (c) between from about 2 to about 10 percent BWOC of calcined kaolin or metakaolin;
- and
- (d) between from about 0.5 to about 55 percent BWOC of micro silica quartz;
- and
- allowing the cementitious slurry to set.
Dependencies are inferred from the claim text.