Spotting fluid for differential sticking
US6435276B1 · kind B1 · utility
19Cited by
7References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 10, 2001 |
| Grant date | Aug 20, 2002 |
| Priority date | — |
| Expiry date | Jan 10, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S507/94
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A new composition for a spotting fluid and a method of using such spotting fluid for freeing differential stuck pipe in a subterranean well drilling operation is disclosed. The composition comprises an invert water-in-oil emulsion comprising iso-butyl oleate as its external phase and glycerin as the internal phase. In an alternative embodiment, calcium chloride and water may be substituted for glycerin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.