WO1990014497A2 - Process and device for transmitting data signals and/or control signals in a pipe train - Google Patents

Process and device for transmitting data signals and/or control signals in a pipe train Download PDF

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Publication number
WO1990014497A2
WO1990014497A2 PCT/EP1990/000837 EP9000837W WO9014497A2 WO 1990014497 A2 WO1990014497 A2 WO 1990014497A2 EP 9000837 W EP9000837 W EP 9000837W WO 9014497 A2 WO9014497 A2 WO 9014497A2
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WO
Grant status
Application
Patent type
Prior art keywords
unit
characterized
signals
control signals
receiver
Prior art date
Application number
PCT/EP1990/000837
Other languages
German (de)
French (fr)
Other versions
WO1990014497A3 (en )
Inventor
Rainer JÜRGENS
Volker KRÜGER
Joachim Oppelt
Dagobert Feld
Martin Schleemann
Original Assignee
Eastman Christensen Gmbh
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

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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00Survey of boreholes or wells
    • E21B47/12Means 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
    • E21B47/14Means 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
    • E21B47/18Means 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
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods ; Cables; Casings; Tubings
    • E21B17/02Couplings; joints
    • E21B17/028Electrical or electro-magnetic connections
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00Survey of boreholes or wells
    • E21B47/12Means 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
    • E21B47/122Means 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
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00Adaptations of transformers or inductances for specific applications or functions
    • H01F38/14Inductive couplings
    • H01F2038/143Inductive couplings for signals

Abstract

Process and device for transmitting data signals and/or control signals in a pipe train (1) during operation of a drilling implement, in particular process and device for transmitting data signals and/or control signals from the borehole to the surface. Data in the form of data signals and/or control signals are retransmitted between a data processing unit and/or control unit and a processor (10) via a transmission section between a transmitter unit (8, 11, 18, 30) and a receiver unit (9, 14, 20, 31). In order in particular to transmit local or remote data to the processor while taking account of the operating conditions prevailing in the pipe train, the data signals and/or control signals are transmitted via the transmission section between the transmitter and receiver units or via one or more alternating magnetic fields, or the data received by the transmitter unit (8, 11, 18, 30) are retransmitted to the receiver unit (9, 14, 20, 31) via the transmission section in the form of audio signals. In devices according to the invention, the transmission section includes magnetically inductive couplers (18, 20), or an audio sensor (8, 11, 30) and an audio receiver (9, 14, 31).

Description

Method and apparatus for transmission of information and / or control signals in a drill string

The invention relates to methods and devices for transmission of information and / or control signals in a drill string during operation of a drilling device, in particular to methods and devices for Über¬ transmission of information and / or control signals from the wellbore to the earth surface, wherein data between a data acquisition and / or control equipment unit and a processor as an information and / or control signals on a transmission path from a transmitter unit to a receiver unit v / pus be passed.

In known methods and devices of this kind, the devices for the information data acquisition, and the processor for converting the data into a sequence of electrical signals Steuer¬ in the same housing or in separate use, immediately adjacent the housing inserts ver¬ agrees that z. B. mit¬ each other are electrically coupled by plug connections. but such an arrangement is only suitable for equipment for the collection of such data can not or do not occur very selectively localized auf¬ as __. B. for inclination, azimuth, temperature or pressure applies. Devices are further known from DE-PS 34 28 931, in which determined information and control data signals transmitted as pressure pulses from a transmitter on the Spulungsflussigkeit of the drilling device to a receiver unit and passed on from there to the processor v / ground. This over- tragungsart convinced for many applications, however, for certain data transmission requirements, for example for transmitting data from a stationary. Find A drill string to a rotating drill string only with increased effort application. This also applies to the Datentübertragung in greater depths at __. B. tung drill the RICH. The arrangement possibility of pressure pulse sensors within the drill string is also limited due to the wear anfälliykeit such devices.

It is therefore an object of the present invention to drive a Ver¬ and to provide a device of the type mentioned in which, or with which both localized as to be detected locally deposited also on the processor information based on the features of the present in the drill string operating conditions quickly even are contributing to über¬ example, in directional drilling. This object is achieved with the inventive method of the aforementioned type by the clause in kenn¬ part of claims 1 and 14 features indicated. Devices according to the invention is first characterized by the features indicated in claims 4 and 23 features.

By transferring the or control signals information on the transmission link between the transmitter and receiver unit via magnetically inductive couplers, which can be mutually coupled also preferably, or by acoustic signal transmitters and receivers, expediently as ultrasonic or structure-borne sound transmitters and receivers is first to increase the transmission rate significantly, and, moreover, the transmission of such signals at z. B. directional drilling possible with substantially reduced transmission errors. In addition can take place, a data transmission in critical areas in the rough environment of operating a drill string between the pipes to be connected, in which a gal¬ vanische cable connection for direct connection a significant manufacturing and / or assembly costs would require or, due to the harsh operating conditions during the drilling operation a significant Störanf be feared maturity of the cable connection. An essential part Vor¬ that accompanies directions with the methods of the invention and the Vor¬ is, moreover, also that Infor¬ of information and / or control signals from a z. B. v / hile the drilling operation stationary outer tube can be contactlessly transferred to a rotating inner tube. Eiteren the v / is possible to transmit data signals with minimal effort in two directions, so that it can operate as a transmitter unit easily a receiver unit by z. B. selected frequency ranges are assigned as sender or receiving operation. These filters can ground provided v /. Likewise, this two-fold operation tasks can be realized by suitable Steue circuits.

The signal transmission required for the inductive data transmission and / or Schall¬ Übertragungselementε are known devices that provide einzu¬ only depending on the application to the operating optimized transmission conditions and are to be interpreted. So z. B. suitable as a magnetically inductive couplers both as transmitter and as Empfän¬ gereinheit inductive loop or coil body whose number of turns is to be adapted or diameter to the operating conditions in a suitable manner. As inductive magnetic receiver units also magnetfeld¬ sensitive semiconductor sensors are suitable beyond. Conveniently, the z lie. B. in the mutually facing end regions as the one hand, the transmitter and the other part serving as Empfängerein¬ integrated magnetically inductive couplers oriented freely with each other, whereby these are to be coupled transformer in a structurally simple manner. At both ends of a pipe magnetically inductive couplers as the one hand, the receiver and transmitter on the other hand for a subsequent

Figure imgf000005_0001
Drill pipe, they may galvanically z. B., however, be connected by cable to be provided compounds, in addition also through electrically conductive Bohrrohrwandungsteile each other. Electrically conductive Bohrrohrwandungsteile can outwards or inwards in such a way the tasks of Übertragungs¬ z. B. bobbins be adapted to have a sufficient gap relative to the coil bobbin so as not to affect the alternating magnetic fields because of their electrical conductivity in the transmission result falsifying manner. It is possible, the magnetic signals to be transmitted and also the Schall¬ signals with only one transmitter / receiver unit on a plurality of interconnected pipes to be transmitted. In this case, advantageously for magnetically transferring Sig¬ dimensional frequency to about 100 Hz selected to Wirbelstrom¬ losses and the like. As low as possible. signals at Schall¬ it is based on the anticipated noise such. B. ambient sounds appropriate to frequencies of z. B. to choose 100 KHz. At an air transmission between bobbins as transmitter / Emρfängereinheit (transformato¬ generic coupling) has a. The frequency range between 1 to 20 KHz proved expedient.

For the transmission of sound signals initially the Bohrrohrwandung offers to transmit structure-borne sound signals from a transmitter unit to a receiver unit. the well casing for structure-borne sound transmission, if any furthermore suitable. The Sender¬ and receiver units can be configured as a piezo transducer. For transmitting ultrasonic signals to addition, an air column offers about which can be vohanden example, in the tubular interior of a casing string.

Both the magnetically inductive couplers and Schall¬ sensors or receivers having transmission links can be coupled with a further transmission link ge respectively, the z. Example, from DE-PS 34 28 931 having known transmission elements as the transmitter and receiver units such. B. pressure pulse transmitter. Here, the pressure pulses can about the further transmission path forming

Lavage fluid of the drilling apparatus is transferred to the receiver unit Druckpuls¬ that TION in known VJeise with the processor for processing the received Informa¬ or control signals is connected. To further illustrate the invention, the drawing and the following description is in the subclaims referred. In the drawing, each showing a schematic broken-off cross-sectional view:

1 shows a first embodiment of a device according to the invention with ultrasound transmission.

Fig. 2 nalübertragung a further embodiment of the device according to the invention in a drill string for directional drilling having a hand Körperschallsig¬ nalübertragung and subsequent Druckpulssig¬;

Fig. 3 shows another embodiment of a Vorrich¬ processing according to the invention with Körperschallsignal- transmission;

4 shows a further embodiment of the device according to the invention with a hand electromagnetic inductive signal transmission from a Andruck¬ force sensor and on the other hand Druckpulsdatenüber¬ transmission for Andruckkraftsignale and for egg gungs- and direction data signals of a v / Eiteren sensor.

Fig. 5 shows a further embodiment of the device according to the invention with pressure pulse signal transmission of tilt and Richtungsmeßdatensignale to the processor and with the pitch and Körperschallsignalüber¬ Richtungsmeßdaten transmission to a directional drilling tool, and

i'ia-f'ϊ i _ __l ____> £ _! Fig. 6 shows an embodiment of another verbun¬ which is coupled to a transformer Spulen¬ inner tubes of a drill string of a device Bohr¬ bodies as magnetic coupling elements to transfer the magnetic data.

The drilling equipment illustrated in the drawing with Vor¬ devices of the invention each comprise a 3. 1 as a whole designated drill string with an inner channel 2 and a the drill stem 1 surrounding annular space In the embodiment of FIG. 1 is air at 4 Druck¬ in the inner channel 2 inserted, which passes on its way to the bottom hole a drilling turbine, not shown in detail and exits through nozzles of a turbine of the Bohr¬ driven rotary drill bit 5 in the bore hole and through the drill string 1 surrounding annular space 3 returns to the earth's surface. 6

Above the drill bit 5 is a Richtungs¬ and tilt sensor 7, which is connected to an ultrasonic transmitter 8 in the inner channel. 2 The ultrasound signals to an ultrasound receiver 9, which is electrically connected to the processor 10 via the air column in the internal channel 2, passes it to the processor for further processing or evaluation.

In the embodiment of the device according to FIG. 2 the drill string 1 is used for directional drilling. The drill string 1 has in turn an inner channel 2 and a the Bohr¬ strand 1 surrounding annular space 3. During operation of the drilling flushing liquid is here pumped through the inner channel 2 downward by an unillustrated pump, which is not shown on their way to the bottom hole a drives drilling turbine and exits through nozzles of the drill bit driven by the drilling turbine 5 in the borehole and the drillstring by the umge¬ reproduced annular space 3 returns to the earth's surface. Here, a sensor for tilt and Richtungsmeßdaten turn is arranged above the drill bit 7, which is connected to the body sound sensor. 11 Between the pERSonal perschallsender 11 supporting drill pipe and the underground drilling motor 12 with rinsing drive is a joint piece 13 is provided. Between the engine 12 and the receiver 14 carrying the Körperschall¬ drill pipe is another joint piece

13. The Neigungs¬ and Richtungsmeßdaten determined by the sensor 17 are passed through structure-borne noise from the sensor 11 to the receiver fourteenth Above the receiver

14, a pressure pulse transmitter 15 is located a known type, of the signals received by the receiver 14 via a wei¬ tere transmission link, which is formed by the Spulungsflussigkeit in the inner tube 2, the pressure pulse receiver

16 forwards. These are values ​​after conversion into electrical signals in the processor 10 degrees.

The embodiment of Fig. 3 with respect to the short-range data-structure-borne sound signal transmission constructed analogously to the embodiment according to Fig. 2. Here, ledig¬ Lich from the sensor 7 z. B. Andrucksignale of the drill bit 5 is determined and, in turn, routed through structure-borne sound signal transmitter 11 nger to the body sound signal receiver 14 wherein, if necessary for greater lengths of the drill string Zwischen¬. Amplifiers are provided. The nger from the structure-borne sound receiver 14 received signals v / ground after conversion into electrical signals in turn in the processor 10 for further processing.

In the embodiment of Fig. 4 above the drill bit 5 of the drill string 1, a first sensor

17 is arranged for determining Andruckkraftsignalen. This is galvanically connected to a bobbin 18th The bobbin 18 is transmitter to the magnetic inductive transmission of the received signals to a transformato¬ driven with the coil 18 via the open air gap 19 gekop¬-coupled coil body 20, which therefore represents the receiver of this magnetic inductive transmission link so that the data transmission without contact rotating of the parts 5, 17 and the body 18 carrying the coil Außen¬ pipe 21 of the drill string 1 to the non-rotating Bohr¬ rohrwandungsteile 22 and carried to the subsequent drilling motor 23rd the signals of the sensor 17 by galvanic coupling via a cable connection 24 to be forwarded to a tilt and Ric eungs- sensor 25 through the downhole motor 23rd The measured data generated in the two sensor units 17 and 25 are then column jointly by the pressure pulse transmitter unit via the Spulungsflüssigkeits- in the channel 2 of the drill string in known manner forwarded to the pressure pulse receiver 16 and from there via a cable connection to the processor, after conversion into electrical signals.

In the embodiment of FIG. 5 is a Neigungs¬ and direction sensor is both a pressure pulse transmitter 27 for transmitting the pitch and Richtungsmeßsignale to the pressure pulse receiver 28 and forwarded to Umwand¬ lung into electrical signals to the processor 10 is connected as well as via a cable connection 29 with a structure-borne sound transmitter 30 gungs- for short-distance data transmission to a structure-borne sound receiver 31 above and below the Nei¬ and direction data sensor, there are several non-magnetic drill collars 32 to the tilt and direction data determination using magnet-sensitive sensors can not be influenced. The structure-borne noise transmitted from the pitch and direction sensor 26 to the Körperschall¬ receiver 31, control signals are passed over a cable connection 33 to the directional drilling tool 34 so that when deviations occur between a vorge given direction or inclination and the detected from the sensor 26 values ​​control movements to be carried out until the deviation has been reduced within a predeterminable tolerance range.

In addition to the aforementioned devices can transmission equipment Übertra¬ and sensors in general, both wei¬ tere electronic components for signal processing as well as batteries or generators driven by the drilling fluid or rotating drill string may be required for generating electrical energy, but which are known per se and in the respective suitable manner can be provided.

In FIG. 6, the Änordnungsmöglichkeit of a magnetically inductive transmitter / receiver unit is illustrated at opposite end portions of the inner tubes of a drill string in a truncated cross-sectional view of an embodiment anhand-. Here, the two ineinanderzuschrauben each other to be coupled to the inner tubes 35 and 36 in known manner. The inside in the graphic representation of the end of the tubular member 36 carries at its end edges of the bobbin 20 (in accordance with the Aus¬ exemplary implementation of FIG. 4), whereas in a recess

37 of the inner tube part 35 of the coil body is located 18th Between the bobbins 18 and 20 is a free air space

38 present, so that the two coil formers 18 and 20 by transformer coupling. The bobbins 18 and 20 each to the wall regions of the Rohr¬ wall part 35 a sufficient lateral distance, so that higkeitseigen¬ due to the electrical conductivity properties of the Rohrwandungsmaterials the Übertragungsergeb¬ nit not be falsified. The coil former 18 serves as a magnetic inductive transmitter via the cable

39 data signals received. From the fungie¬ as a receiver in power coil bobbin 20, the magnetically inductive über¬ signals transmitted via the cable connection 40 to a higher-level control or nach¬ transmitter or receiver part are weiter¬ forward.

'5 -ΛTT

Claims

claims
1. A method of transmitting Informations¬ and / or control signals to a drill string (1) during operation of a drilling device, in particular to methods for transmission of information and / or control signals from the wellbore to the earth surface, wherein data between a data processing and / or Steuergeräte¬ unit and a processor (10) as an information and / or control signals on a transmission link from a Sen¬ dereinheit (18) to a receiver unit (20) are passed, characterized in that the Informations¬ and / or control signals the transmission path between the transmitter and receiver units (18,20) are transmitted via one or more magnetic (s) alternating field (s).
2. The method according to claim 1, characterized gekennz ichnet that the information and / or control signals between a transmitter and a receiver unit (18,20) by the transmitter and the receiver unit penetrating alternating magnetic field (transformer coupling) are transmitted.
3. The method of claim 1 or 2, characterized gekenn¬ characterized in that the from the receiver unit (20) of the transmission link Uber¬ received information and / or Steuer¬ signals to a transmitter unit (15) a further over-
ERSÄT S ATT transmission link will be passed and the transmitter unit (15) of the further transmission path, the received Sig¬ dimensional as pressure pulse signals to the receiver ngereinheit (16) of the further transmission path v / facilities are.
4. Apparatus for transferring Informations¬ and / or control signals in a drill string (1) during the operation of a drill bit (5) comprising Bohr¬ device, in particular for the transmission of Informations¬ and / or control signals from the wellbore to the earth surface, with at least one of the drill string (1) providable Steu¬ ergeräte- and / or data acquisition unit and a Prozes¬ sor (10), wherein the information and / or control signals between processor (10) and ECU and data detection unit on a transmission link by a Sen¬ dereinheit forwarded to a receiver unit v / er¬ to, characterized in that the transmission link for the transmission of information and / or control signals between the transmitter and receiver unit in¬ magnetically inductive couplers (18,20) comprises.
5. Device according to claim 4, characterized in that the magnetically inductive couplers (18,20) Signal¬ associated amplifier.
6. Device according to claim 4 or 5, characterized gekenn¬ characterized in that mutually associated magnetically inductive couplers (18,20) on the one hand to a stationary wall portion of drill pipe and the other wall portion are providable to a rotatable drill pipe.
7. Device according to one of claims 4 to 6, characterized in that magnetically inductive couplers (18,20) and facing each other in the end regions of tubes (35,36) of the drill string (1) arranged bobbin and / or magnetic field sensitive semiconductor sensors are formed.
8. Apparatus according to claim 7, characterized in that the in the end regions of the tubes (35,36) of the drill pipe string arranged magnetically inductive couplers (18,20)
ErSSAT i ATT are mutually facing and mutually coupled free.
9. Device according to one of claims 4 to 8, characterized in that in opposite end portions of a pipe of the drill string (1) provided magnetic inductive coupler galvanically by a cable connection (39,40) and / or electrically conductive Rohrwandungsteile are connected to one another.
10. Apparatus according to claim 9, characterized in that magnetically inductive couplers (18,20) opposite angren¬ collapsing electrically conductive Rohrwandungsteilen are providable with a distance.
is 11. The device according to one of claims 4 to 10, da¬ by that the magnetically inductive couplers (18,20) comprising an own transmission link transmitter unit (15) and its own receiver unit (16) um¬ summary v / urther transmission link associated ,
12. The apparatus according to claim 11, characterized in that the transmitter unit (15) of the further transmission path with the transferred from the first transmission path information and / or control signals can be acted upon.
13. The apparatus of claim 11 or 12, characterized gekenn¬ characterized in that the further transmission path acted upon by one of the further transmitter unit (15) with pressure pulses striking lavage fluid of the drilling device is formed.
14. A method for transmission of information and / or control signals to a drill string (1) during operation of a drilling device, in particular to methods for Über¬ transmission of information and / or control signals from the wellbore to the earth surface, wherein data between a data acquisition and / or control equipment unit and a processor (10) as an information and / or control signals on a transmission path from a transmitter unit si _- ";. ~ _ _: "■ _- .. i ~ i ~ ii (8.11, .30) are / pus routed to a receiver unit (9,14,31) v, characterized in that the (to the transmitter unit 8 , 11, 30) given data is forwarded as a sound signals to the Empfän¬ gereinheit (9,14,31) of the transmission link.
15. The method according to claim 14, characterized in that the from the transmitter unit (8) passes received data as ultrasonic signals to the receiver unit (9) weiterge¬ v / ground.
16. The method according to claim 14, characterized in that the from the transmitter unit (11, 30) received Daten¬ signals as structure-borne sound signals to the receiver unit (14,31) to be forwarded.
17. The method according to claim 16, characterized in that the structure-borne sound signals via Bohrrohrstrangteile to the receiver unit (14,31) transmitted v / ground.
18. The method according to claim 15, characterized in that the transmission link is formed by a rinsing fluid of the drilling and the acoustic signals are transmitted via the flushing liquid.
19. The method of claim 14 or 15, gekenn¬ characterized characterized in that the transmission link is formed by a location within the drill string column of air and the sound signals via the air column from the transmitter unit (8) to the receiver unit (9) is transmitted.
20. The method according to any one of claims 14 to 1, by da¬ in that the receiver of the unit (9,14,31) of the transmission link received sound signals to a transmitter unit (15) passed on to a downstream further transmission path and from there to a separate receiver unit (16) of the further transmission path are passed.
21. The method according to claim 20, characterized in that the from the transmitter unit (15) of the further transmission link Ubertra¬ received sound signals are passed on as pressure pulse signals.
22. The method according to claim 21, characterized in that the from the transmitter unit (15) Druckpuls¬ emitted signals are transmitted via the further transmission path forming lavage fluid of the drilling apparatus.
23. An apparatus for transmitting Informations¬ and / or control signals in a Bohrrohrsträng (1) during the operation of a drill bit comprising Bohrgerä¬ tes, particularly for the transmission of Informations¬ and / or control signals from the wellbore to the earth surface, with at least one at drillstring foreseeable Steuer¬ device and / or data acquisition unit and a processor (10), wherein the information and / or control signals between processor (10) and ECU and data detection unit on a transmission link from a Sender¬ unit (8,11 , 31) (to a receiver unit are forwarded 9,14,30) v / ei¬, characterized in that the drill string is provided on data acquisition and / or control equipment unit is a acoustic sensor (8,11,30) and a sound receiver (9,14 are assigned 31).
24. The device according to claim 23, characterized in that between the transmitter unit (8,11,31) and the Empfänger¬ unit (9,14,30) signal amplifiers are provided.
25. The device according to any one of claims 23 or 24, characterized in that attached to Bohrrohrinnenwandungsteilen converter as a sound signal transmitter and signal receiver piezo sound.
EE3AT2 & LATT
PCT/EP1990/000837 1989-05-23 1990-05-23 Process and device for transmitting data signals and/or control signals in a pipe train WO1990014497A3 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19893916704 DE3916704A1 (en) 1989-05-23 1989-05-23 Signaluebertragung in drill pipes
DEP3916704.6 1989-05-23

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19900908523 EP0426820B1 (en) 1989-05-23 1990-05-23 Process and device for transmitting data signals and/or control signals in a pipe train

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WO1990014497A3 true WO1990014497A3 (en) 1991-01-10

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US8727035B2 (en) 2010-08-05 2014-05-20 Schlumberger Technology Corporation System and method for managing temperature in a wellbore
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
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Also Published As

Publication number Publication date Type
EP0426820A1 (en) 1991-05-15 application
EP0426820B1 (en) 1996-01-17 grant
DE3916704A1 (en) 1989-12-14 application
EP0399987A1 (en) 1990-11-28 application
WO1990014497A3 (en) 1991-01-10 application

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