Wireless communication system for monitoring of subsea well casing annuli
US10267139B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 6, 2016 |
| Grant date | Apr 23, 2019 |
| Priority date | — |
| Expiry date | Aug 6, 2036 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/13
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method for monitoring a condition in at least one of a plurality of casing annuli in a subsea hydrocarbon production system having a wellhead housing mounted at the upper end of a well bore and a number of concentric well casings extending from the wellhead housing through the well bore, including an innermost casing through which a hydrocarbon fluid is produced. The plurality of casing annuli are defined between successive ones of the wellhead housing and the well casings. The method involves sensing at least a first condition at a first location in a first casing annulus, generating a first data signal at the first location which is indicative of the first condition, transmitting the first data signal from the first location to a second location either outside the wellhead housing or inside the innermost casing, receiving the first data signal at the second location; and transmitting the first data signal from the second location to a remote location at which the first condition may be monitored. The first data signal is transmitted from the first location to the second location using near-field magnetic induction (NFM) communications signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.