Apparatus for preventing differential sticking in wells
US4427080A · kind A · utility
9Cited by
9References
33Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 11, 1980 |
| Grant date | Jan 24, 1984 |
| Priority date | — |
| Expiry date | Dec 11, 2000 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/16
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A porous layer is placed on the outside of various well implements. The layer allows movement of liquid toward sites of localized low pressure and therefore prevents differential pressure stickage of the well implements on the borehole wall.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.