Method of drilling a subterranean well with crosslinked polyacrylic acid
US8623790B2 · kind B2 · utility
1Cited by
38References
30Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 21, 2010 |
| Grant date | Jan 7, 2014 |
| Priority date | — |
| Expiry date | Jan 11, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/24
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method of drilling a gas or oil well consists of use of a water-based drilling fluids containing high molecular weight crosslinked polyacrylic acid as viscosifying agent. The drilling fluid may further contain a lubricant, weighting agent and/or a wetting agent as well as a synthetic silicate or smectite clay. The aqueous based drilling fluid exhibits a coefficient of friction which is substantially close to the coefficient of friction of oil based drilling muds. The drilling fluid exhibits stability at well temperatures in excess of 150° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.