EP0399987A1 - Device and method for signal transmission in drill stems - Google Patents

Device and method for signal transmission in drill stems Download PDF

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Publication number
EP0399987A1
EP0399987A1 EP90870079A EP90870079A EP0399987A1 EP 0399987 A1 EP0399987 A1 EP 0399987A1 EP 90870079 A EP90870079 A EP 90870079A EP 90870079 A EP90870079 A EP 90870079A EP 0399987 A1 EP0399987 A1 EP 0399987A1
Authority
EP
European Patent Office
Prior art keywords
pipe
loops
pipes
loop
induction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP90870079A
Other languages
German (de)
French (fr)
Inventor
Heinz Prof. Dipl.-Ing. Wellhausen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMET-HOLE NV
Original Assignee
SMET-HOLE NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SMET-HOLE NV filed Critical SMET-HOLE NV
Publication of EP0399987A1 publication Critical patent/EP0399987A1/en
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
    • E21B47/14—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves
    • E21B47/18—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves through the well fluid, e.g. mud pressure pulse telemetry
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/028—Electrical or electro-magnetic connections
    • E21B17/0283—Electrical or electro-magnetic connections characterised by the coupling being contactless, e.g. inductive
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
    • E21B47/13—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling by electromagnetic energy, e.g. radio frequency
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/14—Inductive couplings
    • H01F2038/143—Inductive couplings for signals

Definitions

  • the invention pertains to a device and method for signal transmission in drill stems.
  • the aim of the present invention is to increase said transmission speed to a considerable extent.
  • the pipes building the drill stem comprise electrically interconnected induction loops in such a way that loops of two pipes between which the signal has to be transmitted are placed opposite each other. Said loops are coupled by a contactless transformer coupling.
  • the signal is transformed and further transferred over two induction loops located opposite each other in the transmission area of two pipes.
  • the transmission can be achieved with a single winding.
  • the electrical connecton of the loops on a pipe is achieved over a single line or wire and over the pipe itself.
  • the electrical resistance can be increased by providing the pipes with a suitable design in the transmission area, with the help of grooves or slots, and in such a way that the magnetic properties of the pipes are not affected. Losses can be avoided to a large extent by using a magnetic material such as ferrite, which is placed around the two opposite loops in such a way that it conducts the essential magnetic flow.
  • the pipes 4 of the stem are screwed on each other and have adjacent ends lying in the extension of each other.
  • On each of said ends is mounted in a groove 5 on the inside of the pipe 4, an open single-winding loop 1.
  • the two ends lying near each other of said loop 1 at one end of a pipe 4 are electrically connected to the two ends of the loop 1 at the other end of the pipe 4 either by two wires, each of them connecting one end of one loop with one end of the other loop, or preferably, as shown in the right pipe 4 in figure 2 by means of one wire 8 connecting one end of one loop to one end of the other loop, the other ends being connected by the pipe 4 itself which pipe should then of course be electrically conductive.
  • Said wires or wire 8 are located in longitudinal grooves 9 in the inner face of the pipe 4. If the pipe 4 is electrically conductive, the loops and the wire 8 or wires have to be insulated, e.g. by non-conductive plastic material or ferrite 6.
  • the transmission link which is established in this fashion is not dependent upon the direction or the frequency of the signal.
  • the pipes themselves also constitute a conductive loop and thus become a short-circuiting winding.
  • the distance between the loop 1 and the pipe 4 must be greater than the distance between the two conductive loops 1 which are to be inductively coupled together. Embedding the conductive loops 1 in material which is magnetically active but is not electrically conductive, such as e.g. ferrite, has a positive effect.
  • the coupling loops 1 are rotated symmetrically one to another, i.e. the pipes 4 can rotate independently from each other, as long as this does not modify the adjacent relative position of the loops.
  • the pipes 4 are e.g. so positioned that the ends of open loops 1 in the pipes are not lying exactly in front of each other.
  • the transmission frequency is selected in such a way that the deadening is minimal. This will depend upon the actual construction and the material properties. A suitable frequency should be found above 1 kHz, e.g. within the 1 kHz - 100 MHz range.
  • FIG 3 a device for signal transmission is shown similar to the above described device but between two pipes 4 one of which penetrates in the other.
  • the pipes 4 may be mechanically connected in known ways to each other. Such connection does not affect the signal transmission. They can be telescoping pipes. Said transmission is achieved by an open loop 1 in a groove 5 in the inner face of the outmost pipe 4 and an open loop 1 in a groove 5 in the outer face of the innermost pipe 4, in front of the other loop both loops 1 being inductively coupled. Loops 1 are embedded in ferrite or non-conductive plastic material 6 holding loop 1 at a distance from the pipe material.
  • each pipe 4 itself is achieved by an electrical connection between the loop 1 in the pipe and a next loop 1 on the same pipe.
  • the electrical connection comprises two wires connecting to two ends of one loop 1 to the two ends of the other loop 1, or only one wire 8 connecting one end of one loop 1 with one end of the other loop 1, and the electrically conductive pipe 4 itself connecting the other ends of both loops 1.
  • Losses are also decreased by increasing the electrical resistance of the pipes 4 what can be obtained by providing said pipes 4 with a suitable design in the transmission area by means of grooves 7. Said grooves 7 do not affect the magnetic properties of the pipes 4 but make the current way longer so that the court-circuit action is decreased.

Abstract

Device for signal transmission in drill stems consisting of pipes (4), characterized in that the device comprises electrically interconnected induction loops (1) located in such a way that loops (1) of two pipes (4) between which the signal has to be transmitted are placed opposite each other and are coupled with a transformer coupling.

Description

  • The invention pertains to a device and method for signal transmission in drill stems.
  • In ground drillings, it is often necessary to send signals to or from the drill head, either for measuring or for controlling purposes. Currently, this is achieved by modifying the pressure of the drilling fluid, which presents the disadvantage of an extremely limited transmission speed.
  • The aim of the present invention is to increase said transmission speed to a considerable extent.
  • To achieve this goal, the pipes building the drill stem comprise electrically interconnected induction loops in such a way that loops of two pipes between which the signal has to be transmitted are placed opposite each other. Said loops are coupled by a contactless transformer coupling.
  • The signal is transformed and further transferred over two induction loops located opposite each other in the transmission area of two pipes. For frequencies of 1 kHz or above, the transmission can be achieved with a single winding.
  • Preferably the electrical connecton of the loops on a pipe is achieved over a single line or wire and over the pipe itself.
  • In general, as the pipes are mostly electrically conductive and form a short-circuited winding for the induction loop, losses will occur. Said losses can be limited by working with low signal voltages, for which the sender and the receiver are to be adapted by means of transformers.
  • The electrical resistance can be increased by providing the pipes with a suitable design in the transmission area, with the help of grooves or slots, and in such a way that the magnetic properties of the pipes are not affected. Losses can be avoided to a large extent by using a magnetic material such as ferrite, which is placed around the two opposite loops in such a way that it conducts the essential magnetic flow.
  • Other features and advantages of the invention will stand out from the following description of a device and method for signal transmission in drill stems according to the invention. Said description is only given by way of example and does not limit the invention; the reference numerals pertain to the accompanying drawings.
    • Figure 1 is a schematic representation of the electrical principle of the signal transmission according to the invention.
    • Figure 2 respresents schematically a longitudinal section of two pipe ends provided with a device for signal transmission according to the invention.
    • Figure 3 represents schematically a longitudinal section of two coaxial pipe parts provided with a device for signal transmission according to the invention.
    • Figure 4 represents schematically a transversal section of a pipe end provided with a device for signal transmission according the invention with respect to another form of embodiment of the invention.
    • Figure 5 and 6 represent sections according to lines V-V and VI-VI in figure 4.
  • The basic philosophy behind this discovery is the contactless transmission of signals via a transformer coupling through wires which are separated from each other and whose galvanic connection is impossible for construction reasons, as is the case e.g. in drill stems. Two conductive loops, located as close to each other as possible, are coupled inductively. At both ends of the conductive chain 2 which is coupled in this way, the adaptation to the generator or receiver circuit is achieved through transformers 3 as shown schematically in figure 1.
  • As shown in figure 2, the pipes 4 of the stem are screwed on each other and have adjacent ends lying in the extension of each other. On each of said ends is mounted in a groove 5 on the inside of the pipe 4, an open single-winding loop 1. The two ends lying near each other of said loop 1 at one end of a pipe 4 are electrically connected to the two ends of the loop 1 at the other end of the pipe 4 either by two wires, each of them connecting one end of one loop with one end of the other loop, or preferably, as shown in the right pipe 4 in figure 2 by means of one wire 8 connecting one end of one loop to one end of the other loop, the other ends being connected by the pipe 4 itself which pipe should then of course be electrically conductive. Said wires or wire 8 are located in longitudinal grooves 9 in the inner face of the pipe 4. If the pipe 4 is electrically conductive, the loops and the wire 8 or wires have to be insulated, e.g. by non-conductive plastic material or ferrite 6.
  • In principle, the transmission link which is established in this fashion is not dependent upon the direction or the frequency of the signal. However, as the material of the pipes is normally electrically conductive, the pipes themselves also constitute a conductive loop and thus become a short-circuiting winding. In order to avoid this and/or to reduce the deadening caused by this phenomenon, the distance between the loop 1 and the pipe 4 must be greater than the distance between the two conductive loops 1 which are to be inductively coupled together. Embedding the conductive loops 1 in material which is magnetically active but is not electrically conductive, such as e.g. ferrite, has a positive effect.
  • For the inductive transmission, it is irrelevant that the coupling loops 1 are rotated symmetrically one to another, i.e. the pipes 4 can rotate independently from each other, as long as this does not modify the adjacent relative position of the loops.
  • In figure 2 the pipes 4 are e.g. so positioned that the ends of open loops 1 in the pipes are not lying exactly in front of each other.
  • The transmission frequency is selected in such a way that the deadening is minimal. This will depend upon the actual construction and the material properties. A suitable frequency should be found above 1 kHz, e.g. within the 1 kHz - 100 MHz range.
  • In figure 3 a device for signal transmission is shown similar to the above described device but between two pipes 4 one of which penetrates in the other.
  • The pipes 4 may be mechanically connected in known ways to each other. Such connection does not affect the signal transmission. They can be telescoping pipes. Said transmission is achieved by an open loop 1 in a groove 5 in the inner face of the outmost pipe 4 and an open loop 1 in a groove 5 in the outer face of the innermost pipe 4, in front of the other loop both loops 1 being inductively coupled. Loops 1 are embedded in ferrite or non-conductive plastic material 6 holding loop 1 at a distance from the pipe material.
  • The signal transmission in each pipe 4 itself is achieved by an electrical connection between the loop 1 in the pipe and a next loop 1 on the same pipe.
  • The electrical connection comprises two wires connecting to two ends of one loop 1 to the two ends of the other loop 1, or only one wire 8 connecting one end of one loop 1 with one end of the other loop 1, and the electrically conductive pipe 4 itself connecting the other ends of both loops 1.
  • As far as the pipes 4 are from electrically conductive material, losses will occur as the pipes form a short circuit winding. Said losses can be limited by working with low signal voltages. The sender and receiver are therefor connected by means of suited tranformers 3 to the conductive chain 2. The losses are also avoided to a large extend by the above mentioned magnetic material 6 such as ferrite.
  • Losses are also decreased by increasing the electrical resistance of the pipes 4 what can be obtained by providing said pipes 4 with a suitable design in the transmission area by means of grooves 7. Said grooves 7 do not affect the magnetic properties of the pipes 4 but make the current way longer so that the court-circuit action is decreased.
  • It should be remarked that said magnetic properties are not essential. At high frequencies, such properties even have a deadening effect.

Claims (8)

1.- Device for signal transmission in drill stems consisting of pipes (4), characterized in that the device comprises electrically interconnected induction loops (1) located in such a way that loops (1) of two pipes (4) between which the signal has to be transmitted are placed opposite each other and are coupled with a transformer coupling.
2.- A device according to claim 1 characterized in that the electrical connection (4, 8) of the loops (1) on the pipe (4) is achieved over a single line (8) and the pipe (4) itself.
3.- Device according to any one of claims 1 and 2, characterized in that the electrical conductivity of the pipe (1) is reduced without affecting its magnetic properties. as a result of an appropriate design, e.g. by means of slots or grooves (7).
4.- Device according to any one of claims 1 to 3, characterized in that the immediate surroundings of the induction loops (1) are lined with a magnetically active material (6) with low electrical conductivity and that the magnetic flow of two loops (1) located opposite each other is conducted through it.
5.- Device according to any one of claims 1 to 4, characterized in that it comprises transformers (3) for adapting to the signal source and to the receivers.
6.- Device according to any one of claims 1 to 5, characterized in that an induction loop (1) consists of a single winding only.
7.- Device according to any one of claims 1 to 6, characterized in that the pipes (4) are mounted end to end and each pipe (4) comprises an induction loop (1) on both ends.
8.- Device according to any one of claims 1 to 6, characterized in that one pipe (4) penetrates the other and in a transmission area, the outermost pipe (4) comprises an induction loop (1) at its inner side while the innermost pipe (4) comprises an induction loop (1) at its outer side. in front of the first mentioned loop (1).
EP90870079A 1989-05-23 1990-05-22 Device and method for signal transmission in drill stems Withdrawn EP0399987A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3916704 1989-05-23
DE3916704A DE3916704A1 (en) 1989-05-23 1989-05-23 SIGNAL TRANSMISSION IN DRILL RODS

Publications (1)

Publication Number Publication Date
EP0399987A1 true EP0399987A1 (en) 1990-11-28

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Family Applications (2)

Application Number Title Priority Date Filing Date
EP90870079A Withdrawn EP0399987A1 (en) 1989-05-23 1990-05-22 Device and method for signal transmission in drill stems
EP90908523A Expired - Lifetime EP0426820B1 (en) 1989-05-23 1990-05-23 Process and device for transmitting data signals and/or control signals in a pipe train

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP90908523A Expired - Lifetime EP0426820B1 (en) 1989-05-23 1990-05-23 Process and device for transmitting data signals and/or control signals in a pipe train

Country Status (3)

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EP (2) EP0399987A1 (en)
DE (1) DE3916704A1 (en)
WO (1) WO1990014497A2 (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2757718A1 (en) * 1996-12-23 1998-06-26 Setmat Transmission device for communication between delivery tanker vehicle and fixed tank
FR2829889A1 (en) * 2001-09-20 2003-03-21 Setmat Loop antennas molded into joints of flexible pipe, e.g. for monitoring fluid flow from tanker, comprise air-cored coils placed at end of pipe within metallic couplings
EP1305547A1 (en) * 2000-07-19 2003-05-02 Novatek Engineering Inc. Data transmission system for a string of downhole components
WO2003042499A1 (en) * 2001-11-12 2003-05-22 Abb Research Ltd. A device and a method for electrical coupling
US6670880B1 (en) 2000-07-19 2003-12-30 Novatek Engineering, Inc. Downhole data transmission system
US6830467B2 (en) 2003-01-31 2004-12-14 Intelliserv, Inc. Electrical transmission line diametrical retainer
US7019665B2 (en) 2003-09-02 2006-03-28 Intelliserv, Inc. Polished downhole transducer having improved signal coupling
US7040415B2 (en) 2003-10-22 2006-05-09 Schlumberger Technology Corporation Downhole telemetry system and method
US7163065B2 (en) 2002-12-06 2007-01-16 Shell Oil Company Combined telemetry system and method
US7852232B2 (en) 2003-02-04 2010-12-14 Intelliserv, Inc. Downhole tool adapted for telemetry
DE102010047568A1 (en) 2010-04-12 2011-12-15 Peter Jantz Device for transmitting information about drill pipe
US8727035B2 (en) 2010-08-05 2014-05-20 Schlumberger Technology Corporation System and method for managing temperature in a wellbore

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Publication number Priority date Publication date Assignee Title
DE3916704A1 (en) * 1989-05-23 1989-12-14 Wellhausen Heinz SIGNAL TRANSMISSION IN DRILL RODS
US5160925C1 (en) * 1991-04-17 2001-03-06 Halliburton Co Short hop communication link for downhole mwd system
JP2766747B2 (en) * 1991-10-25 1998-06-18 株式会社三井造船昭島研究所 Underground information collection device
CA2127921A1 (en) * 1993-07-26 1995-01-27 Wallace Meyer Method and apparatus for electric/acoustic telemetry
GB2341754B (en) 1998-09-19 2002-07-03 Cryoton Drill string telemetry
US6347292B1 (en) 1999-02-17 2002-02-12 Den-Con Electronics, Inc. Oilfield equipment identification method and apparatus
US6866306B2 (en) 2001-03-23 2005-03-15 Schlumberger Technology Corporation Low-loss inductive couplers for use in wired pipe strings
US6641434B2 (en) 2001-06-14 2003-11-04 Schlumberger Technology Corporation Wired pipe joint with current-loop inductive couplers
US7096961B2 (en) 2003-04-29 2006-08-29 Schlumberger Technology Corporation Method and apparatus for performing diagnostics in a wellbore operation
US6950034B2 (en) 2003-08-29 2005-09-27 Schlumberger Technology Corporation Method and apparatus for performing diagnostics on a downhole communication system
US7413021B2 (en) 2005-03-31 2008-08-19 Schlumberger Technology Corporation Method and conduit for transmitting signals
JP2009503306A (en) 2005-08-04 2009-01-29 シュルンベルジェ ホールディングス リミテッド Interface for well telemetry system and interface method
US7913773B2 (en) 2005-08-04 2011-03-29 Schlumberger Technology Corporation Bidirectional drill string telemetry for measuring and drilling control
US7777644B2 (en) 2005-12-12 2010-08-17 InatelliServ, LLC Method and conduit for transmitting signals
US8857510B2 (en) 2009-04-03 2014-10-14 Schlumberger Technology Corporation System and method for determining movement of a drilling component in a wellbore
US9063250B2 (en) 2009-08-18 2015-06-23 Schlumberger Technology Corporation Interference testing while drilling
US8851175B2 (en) 2009-10-20 2014-10-07 Schlumberger Technology Corporation Instrumented disconnecting tubular joint
US8192213B2 (en) 2009-10-23 2012-06-05 Intelliserv, Llc Electrical conduction across interconnected tubulars
US8362915B2 (en) 2009-10-30 2013-01-29 Intelliserv, Llc System and method for determining stretch or compression of a drill string
WO2015192226A1 (en) 2014-06-18 2015-12-23 Evolution Engineering Inc. Measuring while drilling systems, method and apparatus

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2379800A (en) * 1941-09-11 1945-07-03 Texas Co Signal transmission system
US2414719A (en) * 1942-04-25 1947-01-21 Stanolind Oil & Gas Co Transmission system
FR2165074A5 (en) * 1971-12-16 1973-08-03 Drogo Pierre
US4605268A (en) * 1982-11-08 1986-08-12 Nl Industries, Inc. Transformer cable connector
WO1988001096A1 (en) * 1986-08-07 1988-02-11 Contrology Products Limited Rotary signal coupler
DE3916704A1 (en) * 1989-05-23 1989-12-14 Wellhausen Heinz SIGNAL TRANSMISSION IN DRILL RODS

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2547875A (en) * 1936-10-29 1951-04-03 Schlumberger Well Surv Corp Apparatus for taking physical measurements in boreholes
US3090031A (en) * 1959-09-29 1963-05-14 Texaco Inc Signal transmission system
US3588804A (en) * 1969-06-16 1971-06-28 Globe Universal Sciences Telemetering system for use in boreholes
IN142419B (en) * 1973-08-23 1977-07-02 Sun Oil Co
US4293936A (en) * 1976-12-30 1981-10-06 Sperry-Sun, Inc. Telemetry system
US4314365A (en) * 1980-01-21 1982-02-02 Exxon Production Research Company Acoustic transmitter and method to produce essentially longitudinal, acoustic waves
FR2617901B1 (en) * 1987-07-06 1989-10-27 Alsthom DRILLING METHOD WITH ELECTROMAGNETIC TRANSMISSION OF INFORMATION FROM THE BOTTOM
FR2627649B1 (en) * 1988-02-22 1990-10-26 Inst Francais Du Petrole METHOD AND DEVICE FOR TRANSMITTING INFORMATION BY CABLE AND MUD WAVE

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2379800A (en) * 1941-09-11 1945-07-03 Texas Co Signal transmission system
US2414719A (en) * 1942-04-25 1947-01-21 Stanolind Oil & Gas Co Transmission system
FR2165074A5 (en) * 1971-12-16 1973-08-03 Drogo Pierre
US4605268A (en) * 1982-11-08 1986-08-12 Nl Industries, Inc. Transformer cable connector
WO1988001096A1 (en) * 1986-08-07 1988-02-11 Contrology Products Limited Rotary signal coupler
DE3916704A1 (en) * 1989-05-23 1989-12-14 Wellhausen Heinz SIGNAL TRANSMISSION IN DRILL RODS

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2757718A1 (en) * 1996-12-23 1998-06-26 Setmat Transmission device for communication between delivery tanker vehicle and fixed tank
EP1305547A1 (en) * 2000-07-19 2003-05-02 Novatek Engineering Inc. Data transmission system for a string of downhole components
US6670880B1 (en) 2000-07-19 2003-12-30 Novatek Engineering, Inc. Downhole data transmission system
US6717501B2 (en) 2000-07-19 2004-04-06 Novatek Engineering, Inc. Downhole data transmission system
EP1305547A4 (en) * 2000-07-19 2005-04-06 Novatek Engineering Inc Data transmission system for a string of downhole components
FR2829889A1 (en) * 2001-09-20 2003-03-21 Setmat Loop antennas molded into joints of flexible pipe, e.g. for monitoring fluid flow from tanker, comprise air-cored coils placed at end of pipe within metallic couplings
US7083452B2 (en) 2001-11-12 2006-08-01 Vetco Gray Controls Limited Device and a method for electrical coupling
WO2003042499A1 (en) * 2001-11-12 2003-05-22 Abb Research Ltd. A device and a method for electrical coupling
US7565936B2 (en) 2002-12-06 2009-07-28 Shell Oil Company Combined telemetry system and method
US7163065B2 (en) 2002-12-06 2007-01-16 Shell Oil Company Combined telemetry system and method
US6830467B2 (en) 2003-01-31 2004-12-14 Intelliserv, Inc. Electrical transmission line diametrical retainer
US7852232B2 (en) 2003-02-04 2010-12-14 Intelliserv, Inc. Downhole tool adapted for telemetry
US7019665B2 (en) 2003-09-02 2006-03-28 Intelliserv, Inc. Polished downhole transducer having improved signal coupling
US7040415B2 (en) 2003-10-22 2006-05-09 Schlumberger Technology Corporation Downhole telemetry system and method
DE102010047568A1 (en) 2010-04-12 2011-12-15 Peter Jantz Device for transmitting information about drill pipe
US8727035B2 (en) 2010-08-05 2014-05-20 Schlumberger Technology Corporation System and method for managing temperature in a wellbore

Also Published As

Publication number Publication date
EP0426820A1 (en) 1991-05-15
DE3916704A1 (en) 1989-12-14
WO1990014497A2 (en) 1990-11-29
WO1990014497A3 (en) 1991-01-10
EP0426820B1 (en) 1996-01-17

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