Detachable apparatus for preventing differential pressure sticking in wells
US4602690A · kind A · utility
14Cited by
8References
24Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 17, 1983 |
| Grant date | Jul 29, 1986 |
| Priority date | — |
| Expiry date | Mar 17, 2003 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B31/035
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A removable 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.