Electromagnetic detector apparatus and method for oil or gas well, and circuit-bearing displaceable object to be detected therein
US6597175B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 7, 1999 |
| Grant date | Jul 22, 2003 |
| Priority date | — |
| Expiry date | Sep 7, 2019 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/138
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An object to be displaced in an oil or gas well includes a body that is movable through a conduit of an oil or gas well and an electrical circuit that is connected to the body. The electrical circuit can include an active or passive radio frequency identification tag, at least the passive type of which is responsive to an externally generated alternating current electromagnetic signal such that the electrical circuit transmits a responsive signal for reception outside the object as the object moves through the conduit. A detector apparatus for an oil or gas well generally comprises: a body movable through a conduit of an oil or gas well; an electrical circuit connected to the body, the electrical circuit for transmitting an electromagnetic signal for reception away from the body as the body moves through the conduit; and a receiver disposed relative to the conduit and the body to receive the electromagnetic signal from the electrical circuit. The apparatus can further comprise a transmitter disposed relative to the conduit and the body to transmit into the conduit an alternating current electromagnetic signal, wherein the electrical circuit transmits its electromagnetic signal in r…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.