Use of high ratio aqueous alkali silicates in drilling fluids
US9212304B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 20, 2012 |
| Grant date | Dec 15, 2015 |
| Priority date | — |
| Expiry date | Oct 10, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/05
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An improved drilling and completion fluid can be used in subterranean drilling for oil and gas. Sodium silicate and potassium silicate-based drilling fluids are commonly used drilling fluids with the notable attributes of exceptional shale stabilization characteristics coupled with exceptional environmental performance Environmental and wellbore stabilization characteristics are improved by using high ratio aqueous silicates wherein ratio is defined as the molar ratio of SiO2:Me2O, where Me is an alkali and is most commonly sodium or potassium (i.e. Na2O and K2O). For high ratio aqueous alkali silicates, the molar ratio of SiO2:Me2O can range from just over 4.0 to about 12.0.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.