Method of freeing a hollow tubular member
US4448250A · kind A · utility
10Cited by
20References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 22, 1983 |
| Grant date | May 15, 1984 |
| Priority date | — |
| Expiry date | Apr 22, 2003 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/103
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A hollow tubular member, such as a drill string member (15, 16), stuck by differential pressure against the side wall of a wellbore (10), is released by measuring (21) the temperature distribution around the circumference of the member, determining from this measurement the side which is stuck (17), and then perforating (22) the member at the stuck side to flow fluid into the formation and equalize the pressure behind the stuck portion of the member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.