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

Claim 9:
10. A well cementing method for improving cementing quality of a well, comprising:
controlling the hydration heat of cement slurry to control the degree and rate of hydration heat release from the cement slurry, wherein
the method improves the hydration heat release during formation of cement with curing of cement slurry, improves the binding quality between the cement and the interfaces, and in turn improves the cementing quality at an overlap section of a well;
wherein for well cementing of a well of a pure overlap section, hydration heat is controlled by lowering the degree and rate of hydration heat release from cement slurry; wherein the cement slurry is cement slurry with high strength and low elastic modulus, the additional safety time is 60-300 minutes for thickening of the lead slurry and 30-200 minutes for thickening of the tail slurry;
wherein the high strength occurs when the 7-day strength is greater than 28 MPa, and the low elastic modulus occurs when the elastic modulus is less than 10 GPa.