Plug release indication method
US5967231A · kind A · utility
20Cited by
22References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 31, 1997 |
| Grant date | Oct 19, 1999 |
| Priority date | — |
| Expiry date | Oct 31, 2017 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/09
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method of indicating the release of a plug, such as a cementing plug for an oil or gas well, includes releasing a plug from a retained position in a tube system, and in response to releasing the plug, opening an electrical circuit to which the plug was connected in the retained position. The method also includes generating, in response to opening the electrical circuit, a plug release indicator signal. The indicator signal can be generated in response to, for example, a low frequency electromagnetic signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.