Method of cementing a well in geological zones containing swelling clays or mud residues containing clays
US6390197B1 · kind B1 · utility
32Cited by
16References
24Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 18, 2000 |
| Grant date | May 21, 2002 |
| Priority date | — |
| Expiry date | May 18, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S507/928
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Methods of treating wells for cementing operations and for improving placement of cement in wells containing water swelling clays include treatment of the well with a fluid containing clay precipitating agents capable of coagulating clays in the well. The coagulating fluid can contain quaternary ammonium salts, aqueous salts of potassium or cesium, or silicates as the clay coagulating agent. The coagulating fluids can be applied to convert soft mud cake into hard mud cake prior to placement of cement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.