The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 04, 2006
Filed:
Jan. 02, 2002
Steven Martin Hudson, Sturminster Newton, GB;
Daniel Joinson, Carterton, GB;
Steven Martin Hudson, Sturminster Newton, GB;
Daniel Joinson, Carterton, GB;
Expro North Sea Limited, Reading, GB;
Abstract
Data transmission in pipeline systems A first set of apparatus is arranged for transmitting data from a point in a cased section of a wellto a remote location. The apparatus may be used as a relay stationto increase operational depth. Signals are applied to and received from the stringat the relay stationand a selected length of the stringis provided with insulating spacer meanson either side of the relay station to ensure that the stringand casingare effectively isolated for a selected minimum distance. This enables potential differences to be both applied to and detected from the string, thus allowing data transmission and reception. A second set of apparatus is arranged for transmitting from an internal unitinside a cased section of the wellto the immediate surrounding area outside the casing. The internal unitinjects current into the string. A toroidwhich surrounds the casingis provided to pick up signals. Spaced connections between the stringand casingare provided by conductive packers. A mismatch in the current flowing in the stringand casingis generated so that a non-zero flux is seen by the toroid and hence a signal can be received.