Water based wellbore fluids
US6884760B1 · kind B1 · utility
53Cited by
18References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 13, 2000 |
| Grant date | Apr 26, 2005 |
| Priority date | — |
| Expiry date | Mar 18, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S507/901
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The invention relates to water based wellbore fluids used during a hydrocarbon recovery process, such as drilling, fracturing, gravel packing and wellbore workover. According to the present invention, said wellbore fluid comprises a fluid loss additive and a bridging material that are hydrophobic in nature, hydrophobically modified or oil wettable. The wellbore fluid generates an active filter cake that once formed, is impermeable to an aqueous phase, thus reducing fluid loss and ensuring reduced damage to the formation, yet simultaneously is permeable to the back flow of hydrocarbons during a hydrocarbon recovery process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.