Patent ID: 11926787
Assignee: PETROCHINA COMPANY LIMITED
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  E  Y | IPC C  E

Claim 8:
9. The well cementing method according to claim 1, wherein
for well cementing with single setting cement slurry, controlling of hydration heat is achieved by lowering the degree and rate of hydration heat release from the cement slurry; wherein the cement slurry is cement slurry with high strength and low elastic modulus, and its additional safety time for thickening is 60-300 minutes;
for well cementing with multi-setting cement slurry comprising a lead slurry, an intermediate slurry and a tail slurry, wherein for the lead slurry, controlling of hydration heat is achieved by lowering the degree and rate of hydration heat release from the slurry, wherein the lead slurry is cement slurry with high strength and low elastic modulus, and its additional safety time for thickening is 60-300 minutes; wherein for the intermediate slurry, controlling of hydration heat is achieved by increasing the degree and rate of hydration heat release from the slurry, wherein the intermediate slurry is cement slurry with high strength, and its additional safety time for thickening is 60-200 minutes; and wherein for the tail slurry, controlling of hydration heat is achieved by increasing the degree and rate of hydration heat release from the slurry, wherein the tail slurry is cement slurry with high strength, and its additional safety time for thickening is 30-60 minutes.