Patent ID: 11939520
Assignee: SAUDI ARABIAN OIL COMPANY
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A corrosion inhibiting cement composition for reducing corrosion of wellbore casings, the corrosion inhibiting cement composition comprising:
30 wt.% cement precursor based on the total weight of the corrosion inhibiting cement composition, where the cement precursor is API Class G cement;
40 percent by weight of cement (BWOC) silica flour;
150 percent BWOC of the weighting agent;
3 percent BWOC expansion additive;
0.2 percent BWOC defoamer;
9 percent BWOC latex;
1.4 percent BWOC latex stabilizer;
2.6 percent BWOC cement retarder; and
0.9 percent BWOC amine corrosion inhibitor, where the amine corrosion inhibitor comprises a polyethylene polyamine, where the polyethylene polyamine comprises hexaethyleneheptamine (HEHA), one or more polyethylene polyamines having molecular weights greater than a molecular weight of hexaethyleneheptamine, or both; and
the balance water, where the corrosion inhibiting cement composition comprises from 5 weight percent to 70 weight percent water based on the total weight of the cement composition;
where the corrosion inhibiting cement composition has a thickening time of from 0.5 hours to 6 hours.