Flexible durable cement
According to at least one embodiment of the present description, a cement slurry includes 50% to 90% BWOC of a cement precursor material based on a total weight of the cement slurry; and from 10% to 50% BWOC of a flexible additive based on the total weight of the cement slurry. The flexible additive includes hydrophilic polyolefin fibers or 2,6-di-tert-butyl-p-cresol.
1. A wellbore cementing system comprising:
a tubular positioned in a wellbore such that an annulus is formed between a geological formation and the tubular; and
a cement structure positioned in at least a portion of the annulus, where
the cement structure comprises from 10% to 50% by weight of cement of a flexible additive based on the total weight of the cement structure, and
where the flexible additive comprises 2,6-di-tert-butyl-p-cresol.
2. The wellbore cementing system of claim 1 , where the flexible additive consists essentially of 2,6-di-tert-butyl-p-cresol.
3. The wellbore cementing system of claim 1 , where the flexible additive has a density from 1000 kg/m 3 to 1700 kg/m 3 .
4. The wellbore cementing system of claim 1 , where the flexible additive has a specific gravity from 2.0 to 3.0.
5. The wellbore cementing system of claim 1 , where the cement structure comprises from 10% to 30% by weight of cement of the flexible additive based on the total weight of the cement structure.
6. The wellbore cementing system of claim 1 , where the cement structure has a Young's modulus 10 days after curing from 0.90×10 6 psi to 1.20×10 6 psi.
7. The wellbore cementing system of claim 1 , where the cement structure has a Young's modulus 20 days after curing from 0.90×10 6 psi to 1.20×10 6 psi.
8. The wellbore cementing system of claim 1 , where the cement structure has a Young's modulus 30 days after curing from 0.90×10 6 psi to 1.20×10 6 psi.
9. The wellbore cementing system of claim 1 , where the cement structure has a Poisson's ratio 10 days after curing from 0.120 psi to 0.140 psi.
10. The wellbore cementing system of claim 1 , where the cement structure has a Poisson's ratio 20 days after curing from 0.110 psi to 0.130 psi.
11. The wellbore cementing system of claim 1 , where the cement structure has a Poisson's ratio 30 days after curing from 0.190 psi to 0.210 psi.