Water based completion and displacement fluid and method of use
US8105989B2 · kind B2 · utility
10Cited by
24References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 20, 2006 |
| Grant date | Jan 31, 2012 |
| Priority date | — |
| Expiry date | Nov 4, 2028 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B37/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method of cleaning a wellbore prior to the production of oil or gas is disclosed, wherein the wellbore has been drilled with an invert emulsion drilling mud that forms an invert emulsion filter cake. The method may include the steps of circulating a breaker fluid into the wellbore, where the breaker fluid includes an aqueous fluid, a water soluble polar organic solvent, a hydrolysable ester of a carboxylic acid, and a weighting age, and where the hydrolysable ester is selected so that upon hydrolysis an organic acid is released and the invert emulsion of the filter cake breaks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.