EP0047704A2
Expired / Lapsed
EP
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Well logging fiber optic communication system
Assignee: SLB NV
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Filing: 1981-09-08
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Granted: —
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Expires: 2001-09-08
Abstract
Abstract To facilitate use of logging cables with fiber optic signal conductors, the optic source and detector at the surface are mounted on the winch drum. Electrical signals communicate between the control/processing unit and the optic source and detector on the winch drum.
Inventors
- 👤 Russel P. Wharton
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 23:36
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/24; G02B6/36; G02B6/3604; G02B6/44; G02B6/4439; H; H04; H04B; H04B10/00; H04B10/25
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
145 words
A well logging method for measuring characteristics of earth formations in a borehole, characterized by: a) supporting a well logging cable containing fiber optic means on a rotatable winch drum for lowering and raising the cable into and out of the borehole in response to rotation of the winch drum; b) launching modulated light signals representative of characteristics of the earth formations into the end of the fiber optic means opposite the drum; c) receiving the modulated light signals from the fiber optic means in a transducer mounted on the drum and converting them on the drum into electrical signals representative of the earth formation measurements; and d) transmitting the electrical signals from the drum to a receiver mounted outside the drum to convey the information carried by the modulated light signals out of the rotatable winch drum without the use of optical slip rings.
Claim 2
Dependent Claim
145 words
A well logging method for measuring characteristics of earth formations in a borehole, characterized by: a) supporting a well logging cable containing fiber optic means on a rotatable winch drum for lowering and raising the cable into and out of the borehole in response to rotation of the winch drum; b) launching modulated light signals representative of characteristics of the earth formations into the end of the fiber optic means opposite the drum; c) receiving the modulated light signals from the fiber optic means in a transducer mounted on the drum and converting them on the drum into electrical signals representative of the earth formation measurements; and d) transmitting the electrical signals from the drum to a receiver mounted outside the drum to convey the information carried by the modulated light signals out of the rotatable winch drum without the use of optical slip rings.
Claim 3
Dependent Claim
20 words
The method of claim 1 characterized in that said transmitting step comprises transmitting the electrical signals through electrical slip rings.
Claim 4
Dependent Claim
39 words
The method of claim 1 or 2 further characterized by converting other electrical signals into light signals on the drum and launching the light signals into the fiber optic means for transmission to the end thereof opposite the drum.
Claim 5
Dependent Claim
55 words
The method of claim 3 characterized in that said transmitting step includes transmitting the electrical signals through said electrical slip rings between the drum and a transceiver mounted outside the drum to convey the information carried by the light signals into and out of the rotatable winch drum without the use of optical slip rings.
Claim 6
Dependent Claim
126 words
A winch unit for use in measuring characteristics of earth formations in a borehole, characterized by: a) a rotatable winch drum for supporting a fiber optic containing communication cable; b) electro-optical transducer means mounted on said drum for rotation therewith; c) coupling means on said transducer means for coupling with at least one optical fiber in such a communication cable when would on said drum; d) said transducer means including means for receiving modulated optical signals from such an optical fiber and converting them into electrical signals; e) and means for transmitting said electrical signals from said transducer means out of said drum to convey the information carried by such modulated light signals out of said rotatable winch drum without the use of optical slip rings.
Claim 7
Dependent Claim
126 words
A winch unit for use in measuring characteristics of earth formations in a borehole, characterized by: a) a rotatable winch drum for supporting a fiber optic containing communication cable; b) electro-optical transducer means mounted on said drum for rotation therewith; c) coupling means on said transducer means for coupling with at least one optical fiber in such a communication cable when would on said drum; d) said transducer means including means for receiving modulated optical signals from such an optical fiber and converting them into electrical signals; e) and means for transmitting said electrical signals from said transducer means out of said drum to convey the information carried by such modulated light signals out of said rotatable winch drum without the use of optical slip rings.
Claim 8
Dependent Claim
115 words
Apparatus of claim 5 for use as a well logging system for measuring characteristics of earth formations in a borehole, further characterized by: a tool including a sonde connected to one end of said cable; means in said tool for measuring characteristics of earth formations in the borehole, converting the measurements into modulated light signals, and launching said modulated light signals into said fiber optic means in said cable; a receiver mounted outside said drum; and in that said transmitting means transmits said electrical signals from said transducer means to said receiver for conveying the information carried by said modulated light signals out of said rotatable winch drum without the use of optical slip rings.
Claim 9
Dependent Claim
20 words
Apparatus of claim 5 or 6 characterized in that said means for transmitting said electrical signals comprises electrical slip rings.
Claim 10
Dependent Claim
49 words
Apparatus of claim 6 or 7 characterized in that said receiver further comprises a transceiver and said transducer means further comprises means for converting other electrical signals into modulated light signals and launching the light signals into said fiber optic means in said cable for transmission to said tool.
Claim 11
Dependent Claim
18 words
Apparatus of any one of claims 5-8 characterized in that said transducer means is mounted within said drum.
References Cited (Backward Citations)
No citation records indexed.
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