EP2564013A2 - Tringlerie de tube de forage ou de transport - Google Patents

Tringlerie de tube de forage ou de transport

Info

Publication number
EP2564013A2
EP2564013A2 EP11721422A EP11721422A EP2564013A2 EP 2564013 A2 EP2564013 A2 EP 2564013A2 EP 11721422 A EP11721422 A EP 11721422A EP 11721422 A EP11721422 A EP 11721422A EP 2564013 A2 EP2564013 A2 EP 2564013A2
Authority
EP
European Patent Office
Prior art keywords
drilling
linkage
outer tube
tube
data transmission
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Withdrawn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
EP11721422A
Other languages
German (de)
English (en)
Inventor
Josef Grotendorst
Gesine DREIER
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.)
GEOXTEC GmbH
Original Assignee
GEOXTEC 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
Application filed by GEOXTEC GmbH filed Critical GEOXTEC GmbH
Publication of EP2564013A2 publication Critical patent/EP2564013A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK 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
    • E21B17/0285—Electrical or electro-magnetic connections characterised by electrically insulating elements
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK 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
    • E21B17/003—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings with electrically conducting or insulating means
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B27/00—Containers for collecting or depositing substances in boreholes or wells, e.g. bailers, baskets or buckets for collecting mud or sand; Drill bits with means for collecting substances, e.g. valve drill bits
    • E21B27/02—Dump bailers, i.e. containers for depositing substances, e.g. cement or acids
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E21B47/01—Devices for supporting measuring instruments on drill bits, pipes, rods or wirelines; Protecting measuring instruments in boreholes against heat, shock, pressure or the like
    • E21B47/013—Devices specially adapted for supporting measuring instruments on drill bits
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E21B47/01—Devices for supporting measuring instruments on drill bits, pipes, rods or wirelines; Protecting measuring instruments in boreholes against heat, shock, pressure or the like
    • E21B47/017—Protecting measuring instruments
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L25/00—Constructive types of pipe joints not provided for in groups F16L13/00 - F16L23/00 ; Details of pipe joints not otherwise provided for, e.g. electrically conducting or insulating means
    • F16L25/01—Constructive types of pipe joints not provided for in groups F16L13/00 - F16L23/00 ; Details of pipe joints not otherwise provided for, e.g. electrically conducting or insulating means specially adapted for realising electrical conduction between the two pipe ends of the joint or between parts thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
    • F16L9/147—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups comprising only layers of metal and plastics with or without reinforcement

Definitions

  • the invention relates to a tubular element for a drilling or production tubing, comprising an outer tube of electrically conductive material and an electrical conductor passed through the outer tube, which is electrically insulated from the outer tube, wherein the electrical conductor is an inner tube made of electrically conductive material Material is, and wherein the inner tube is arranged concentrically to the outer tube.
  • the invention relates to a drilling or production pipe string.
  • the invention relates to a drilling or conveying device, with a plurality of pipe elements connected to a linkage.
  • a corresponding tube element is known, for example, from DE 38 52 151 T2.
  • the object of the invention is to provide a drilling or production pipe string, which incorporates an electrical power supply of in the linkage,
  • BEST ⁇ TfGUNGSKOPIE electrically operated facilities and allows data transmission between above and below ground.
  • the tube element according to the invention has an outer tube of electrically conductive material. Through the outer tube, an electrical conductor is guided, which is electrically insulated from the outer tube. This electrical conductor is used for electrical power supply of incorporated into the linkage electrically operated devices and / or data transmission between above and below ground via the preferably made of similar pipe elements drilling or production tubing.
  • the electrical conductor is an inner tube of electrically conductive material, wherein the inner tube is arranged concentrically to the outer tube, with an annular gap-shaped cavity between inner tube and outer tube. About inner and outer tube a bipolar energy and / or data transmission is possible. The inner tube is separated from the outer tube via the annular gap-shaped cavity. Over the greater part of the longitudinal extent of the tubular element outer and inner tube form no bond.
  • the mechanical loads to be absorbed by the linkage can thus be borne substantially by the outer tube.
  • the inner tube has no mechanical bearing function.
  • the annular gap-shaped cavity which should be sealed against the environment and against the tube interior, provides for a low electrical wave resistance, which is positive for the data transmission, for example according to the carrier frequency principle, over long distances.
  • the gap width of the annular gap-shaped cavity should be at least 1 mm, preferably at least 5 mm, most preferably at least 1 cm.
  • the inner tube is preferably fixed to the outer tube at least in its opposite end regions. If the individual pipe elements, for example, longer than 3 meters, can between the outer and inner tube However, additional support body may be provided from electrically non-conductive material.
  • the outer pipe can have threaded connections at its ends, via which similar pipe elements can be detachably connected to one another.
  • electrodes can be arranged which produce an electrical contact between the electrical conductors of interconnected similar tube elements.
  • the electrodes are axially spring loaded or axially resilient.
  • the electrodes may be formed, for example, as concentric with the longitudinal central axis of the tubular element ring electrodes.
  • An axially resilient embodiment of an electrode should mean that the electrode can be compressed in the axial direction and automatically returns to its non-compressed rest position.
  • the inner tube should have a coating of electrically insulating material at least on its inner side so that fluid can be passed through the tube interior (for example, water, gas, petroleum, drilling mud).
  • the coating should preferably also protect the inner tube against wear and corrosion.
  • the drilling or conveying device has a plurality of interconnected to a linkage pipe elements according to one of the embodiments described above or any combination thereof. Furthermore, the drilling or conveying device comprises a power supply and / or data transmission device for two-pole energy and / or data transmission via the linkage, wherein an electrical pole is formed by the electrical conductors and the other electrical pole through the outer tubes of the tubular elements.
  • the power supply and / or data transmission device is connected via slip ring contacts with the electrical conductor and the outer tube of at least one of the pipe elements of the linkage.
  • the data transmission device operates according to the carrier frequency method, wherein the electrical lines formed by the electrical conductors and the outer tubes can serve both for energy and for data transmission.
  • the drilling device conveying device has an electrically driven drill bit arranged on the rod end, the drive of which is supplied with electrical energy by the power supply device via the linkage.
  • An alternative advantageous embodiment of the invention provides that the drilling or conveying device has a rod arranged on the end side Richtbohrm adoptedel whose drilling direction is controlled by means of electrical control signals, wherein the control signals are transmitted from the data transmission device via the linkage to the directional drill bit.
  • the directional drill bit can be supplied with electrical energy via the linkage.
  • a separation device which has a release agent container, wherein from the release agent container on a transferable from the data transmission device via the linkage to the separating device, electrical control signal release means in a wellbore is releasable.
  • the release agent which may be, for example, a granulate of suitable grain size, sinks onto the bottom of the borehole.
  • suspended particles which are, for example, components of the mud, descend to the top of the release agent sunk onto the drilling sole, thereby sealing off the annulus above the separator within the wellbore from the annulus below.
  • the energy supply and control of the separating device is preferably carried out via the linkage composed according to the invention.
  • the separating device comprises an activatable by means of a further control signal electromagnet whose magnetic field causes a return of magnetic particle separating agent from the borehole in the release agent container.
  • the drilling or conveying device on a incorporated into the linkage measuring device, which comprises at least one sensor for detecting measurement signals.
  • the sensor is connected to the electrical conduction poles of the linkage in such a way that the measurement signals are transferable via the linkage to the data transmission device.
  • the sensor is a seismic sensor.
  • any type of measuring sensor system with associated electronics in the interior of the measuring device.
  • the sensors and electronic components can be mounted, for example, on a suitable mounting plate, which is kept at rest by means of a controllable, hydraulic damper system.
  • the sensors may be quality and / or quantity sensors used to monitor the mud and the well annulus.
  • the data obtained can be transmitted via the drill string according to the invention in millisecond to day.
  • pressure-resistant viewing window for optical measuring sensors can be installed in the housing of the measuring device (replaceable) pressure-resistant viewing window for optical measuring sensors can be installed.
  • a standardized module is suitable, which has in its interior a capsule for installation of any sensors or other devices.
  • the passage for the drilling fluid or for the raw material to be conveyed can be diverted outwards in the entrance area of the module into an annular gap-shaped channel between the capsule outer wall and the inner wall of the module housing.
  • the capsule can be sufficiently large in this way be dimensioned to install any components without restricting the drilling or conveying functionality of the drilling or production tubing.
  • the flushing or the medium to be conveyed is directed back inside, in the inner tube of the linkage.
  • the capsule is connected to the operation of the components installed therein with the electrical conduction poles of the drill string.
  • the module can be used with appropriate gauges to continuously perform quality and quantity measurements in the well annulus and inside the drilling or production string.
  • the measured data and the control signals can be transmitted bidirectionally between above and below ground via the linkage.
  • the capsule of the module should be provided on the outside with a thermally insulating and anti-wear and corrosion protective coating. Due to the high temperatures in the wellbore should be integrated into the capsule, a cooling unit that generates a suitable for the operation of the built-in capsule electrical and electronic components temperature.
  • the cooling unit can be operated electrically, wherein the power supply and control according to the invention takes place via the linkage. It is important that the module behaves electrically like the rest of the linkage.
  • the two poles of energy and / or data transmission are looped through from the input to the output of the module and the characteristic impedance is identical to that of the rest of the linkage.
  • one or more modules can be incorporated anywhere in the drill string.
  • the standardized module is preferably connectable via the threaded connections of the tubular elements with the tubular elements, as is also possible between adjacent tubular elements.
  • the linkage according to the invention can be advantageously used for a delivery line for the promotion of water, gas or oil.
  • the possibility of integration of measuring sensors in the linkage and the data transmission to the surface can be used to advantage to record seismic data.
  • a suitable seismic sensor acceleration sensor, geophone
  • the invention further proposes the use of the drilling or conveying linkage according to one of the embodiments described above or any combination thereof for deep drilling or flat drilling.
  • deep drilling is meant drilling in one direction, the vertical component of which is greater than the horizontal component, while flat drilling is understood to mean drilling in one direction, the horizontal component of which is greater than the vertical component.
  • FIG. 1 shows a longitudinal section through an exemplary embodiment of the pipe element according to the invention
  • FIG. 2 shows a detail of a connection of two pipe elements according to FIG. 1 in longitudinal section
  • Figure 3 a longitudinal section through another
  • Figure 4 a longitudinal section through another
  • Figure 5 a longitudinal section through another
  • Figure 6 a perspective view of a
  • Embodiment for the electrodes of the pipe elements according to the invention Embodiment for the electrodes of the pipe elements according to the invention.
  • FIG. 1 shows a longitudinal section through an exemplary embodiment of the pipe element 1 according to the invention.
  • the pipe element 1 has an outer pipe 2 of electrically conductive material.
  • an elec- trischer conductor in the form of a concentric with the outer tube 2 arranged inner tube 3 made of electrically conductive material.
  • an annular gap-shaped cavity 4 is arranged between the outer tube 2 and the inner tube 3.
  • the inner tube 3 is fixed to the outer tube 2 in its opposite end regions via bushings 5 and 6.
  • the outer tube 2 has threaded connections 7 and 8 at its ends, via which the tube element 1 can be detachably connected to similarly formed tube elements 1.
  • electrodes 9 and 10 are arranged, which produce an electrical contact between the electrical conductors of interconnected, similarly formed tubular elements 1.
  • the electrodes 9 and 10 are formed as concentric to the longitudinal central axis A of the tubular element 1 ring electrodes. At least one of the two electrodes 9 and 10 is axially spring loaded.
  • the inner tube 3 has on its inside a non-illustrated temperature-resistant coating of electrically insulating material such as plastic. Also between the sockets 5 and 6 and the outer tube 2, a temperature-resistant (> 350 ° C) coating of electrically insulating material is arranged.
  • the arranged between the sockets 5 and 6 and the outer tube 2 of a tubular element 1 coating of electrically insulating material extends over the entire inner side of the outer tube 2.
  • the sockets 5 and 6 may be shrunk at the opposite ends of the inner tube 3.
  • the bushes 5 and 6 are on its inside and the inner tube 3 is uncoated on its outer side, so that they form an electrical unit after shrinking onto the inner tube 3. Since the inner tube 3 is fixed to the outer tube 2 only in the region of the bushings 5 and 6, it is ensured that all external forces (torques, tension, thrust, shear) are absorbed by the outer tube 2.
  • annularly formed Teflon gasket 1 Arranged on the bushing 5 is an annularly formed Teflon gasket 1 which engages with the connection of the tubular element 1 with further identically designed tubular elements 1 in an annular recess 12 on the bushing 6 of a further tubular element 1.
  • the gap width of the annular gap-shaped cavity 4 is designed such that a small electrical characteristic impedance is formed, which is optimal for data transmission via the tubular element 1 according to the carrier frequency principle over long distances.
  • the annular gap-shaped cavity 4 is filled with air and sealed from the environment and against the tube interior.
  • the configuration shown in Figure 1 allows a two-pole transmission of AC or DC voltages in the range of 1-1000 volts and a bidirectional data transmission with up to 1000 kbit / s.
  • FIG. 2 shows a section of a longitudinal section of a connection of two tubular elements 1, which are designed in accordance with the tubular element 1 shown in FIG.
  • the outer tubes 2 of the tubular elements 1 are detachably connected to one another via the threaded connections 7 and 8.
  • an electrical contact via the electrodes 9 and 10 is made.
  • the ring-shaped Teflon seal 11 engages in the annular recess 12 on the socket 6 a.
  • the drilling or conveying device has a power supply and / or data transmission device, not shown, which is connected via slip ring contacts (not shown) to the inner tube 3 and the outer tube 2 of at least one of the tube elements 1 of the linkage.
  • the data transmission device operates according to the carrier frequency method.
  • FIG. 3 shows a further embodiment of the pipe element 1 according to the invention in longitudinal section.
  • This embodiment differs from that shown in Figures 1 and 2 on the one hand by the configuration of its end portions and on the other hand in that the inner tube 3 is closed by a flap 14 when it is in its closed position shown.
  • the flap 14 In this closed position, the flap 14 cooperates with an annular seal 15, which is arranged on a shoulder of the inner tube 3.
  • the flap 14 is pivotally mounted about the axis S on the inner tube 3 and preferably acted upon in the direction of its closed position with force, whereby the flap 14 without external force influences of a their open positions is forced into the closed position.
  • This embodiment of the tubular element 1 makes it possible to connect a further tubular element 1 of the same design, which is to be connected to the extension of the linkage with the end of the tubular element 1 or to the socket 6 shown on the right, with the tube element 1 shown without impurities in Connecting region between the tubular elements 1 are present.
  • This is preferably done by a method for connecting pipe elements 1 of a drilling or production tubing, after the first 6, a compressed air connection is not shown connected to the compressed air in the inner tube 3 and thus in the inner tube 3 befindliches fluid to the left to behind the flap 14 is displaceable. After completion of the application of compressed air, the flap 14 moves into the closed position shown, so that left of the flap 14 existing fluid can not push past the flap 14 to the right.
  • the compressed air used for this purpose is used at the same time for purifying the entire connection area in the area of the bushing 6.
  • another tube element 1 of a similar design can now be connected to the bushing 6 of the tubular element 1. Due to the fact that no fluid and no more impurities are present in the area of the bush 6 after the application of compressed air, an ideal connection between the interconnected tubular elements 1 can be produced.
  • the embodiment of the tubular element 1 shown in FIG. 3 can be integrated into the linkage 13 at any suitable location. Also, a plurality of such pipe elements 1 can be integrated into the linkage 13. In any case, via the tube element 1 shown in FIG. 3, as well as in the exemplary embodiment shown in FIGS.
  • FIG. 4 shows a longitudinal section through a further embodiment of the pipe element according to the invention 1.
  • the end portions of this pipe element 1 correspond to those of the pipe element 1 of Figure 3.
  • Difference from the tube elements 1 shown in the preceding figures, that on the outer tube 2 of the tubular element 1 via three annular contacts 16 a Slip ring contact with an energy supply and / or data transmission device, not shown, of a pipe or conveyor device equipped with the pipe element 1 can be produced.
  • FIG. 5 shows a longitudinal section through a further exemplary embodiment of the tube element 1 according to the invention.
  • the tube element 1 of FIG. 5 differs from those of the preceding figures in particular in that the inner tube 3 of the tube element 1 is connected to a capsule 17.
  • a drilling fluid flowing through the pipe element 1 from the right flows around the capsule 17 according to the arrows shown in FIG. 5 and is guided into the inner pipe 3 after the capsule 17.
  • sensors can be installed, which can be used for example to monitor the drilling fluid or the Bohrlochringraums.
  • the outside of the capsule 17 is provided with a thermally insulating and against wear and corrosion protective coating. To protect possibly present in the capsule 17 sensors or other electronic components against the high temperatures in the borehole, a not shown cooling unit can be installed in the capsule 17.
  • Both the cooling unit and the other electronic components in the capsule 17 can be supplied with energy via the linkage according to the invention.
  • data obtained in the capsule 17 can be transmitted to the surface overnight.
  • both the capsule 17 and the outer tube 2 have viewing windows 18.
  • a closing flap 19 is pivotably mounted about the axis B on the inner tube 3 of the tubular element 1.
  • the inner tube 3 can be closed.
  • the closing flap 19 is coupled to an electric drive 20, whose activation also takes place via the drill string.
  • FIG. 6 again shows in perspective the electrodes 9 and 10 shown in FIGS. 1 to 5.
  • the electrodes 9 are approximately helical formed openings 21, so that the electrode 9 is axially resilient and is slightly compressed in a proper joining of tubular elements 1 along the longitudinal axis A, whereby a very good electrical contact between the electrodes 9 and 10 is produced.
  • the drill pipe according to the invention can be used with any conventional drilling rig.
  • control commands are transmitted from the above-ground control station of the drilling rig via the drill pipe to underground facilities of the drill string. These are also supplied via the drill pipe with electrical energy.

Landscapes

  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geophysics (AREA)
  • Remote Sensing (AREA)
  • Earth Drilling (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

L'invention concerne un élément tubulaire (1) pour une tringlerie (13) de tube de forage ou de transport, ledit élément tubulaire comportant un tube extérieur (2) constitué d'un matériau électroconducteur et un conducteur électrique guidé à travers le tube extérieur (2) et isolé électriquement par rapport au tube extérieur (2), le conducteur électrique étant un tube intérieur (3) constitué d'un matériau électroconducteur qui est agencé de manière concentrique par rapport au tube extérieur (2). L'invention vise à mettre au point une tringlerie (13) de tube de forage ou de transport permettant une alimentation en énergie électrique des dispositifs actionnés électriquement et intégrés dans la tringlerie (13) et/ou une transmission de données entre les opérations au jour et sous terre. A cet effet, une cavité (4) en forme de fente annulaire est agencée entre le tube intérieur (3) et le tube extérieur (2).
EP11721422A 2010-04-26 2011-04-26 Tringlerie de tube de forage ou de transport Withdrawn EP2564013A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010018383A DE102010018383A1 (de) 2010-04-26 2010-04-26 Bohr- oder Förderrohrgestänge
PCT/EP2011/002078 WO2011134636A2 (fr) 2010-04-26 2011-04-26 Tringlerie de tube de forage ou de transport

Publications (1)

Publication Number Publication Date
EP2564013A2 true EP2564013A2 (fr) 2013-03-06

Family

ID=44626604

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11721422A Withdrawn EP2564013A2 (fr) 2010-04-26 2011-04-26 Tringlerie de tube de forage ou de transport

Country Status (3)

Country Link
EP (1) EP2564013A2 (fr)
DE (1) DE102010018383A1 (fr)
WO (1) WO2011134636A2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT512604B1 (de) * 2012-03-01 2019-05-15 Think And Vision Gmbh Gestängerohr
CN112878924B (zh) * 2021-01-27 2024-04-02 南通洪源地质工程材料有限公司 一种大直径无缝钻管及其加工工艺
CN113027356A (zh) * 2021-03-30 2021-06-25 中原工学院 一种井下开采随钻测量无线传输钻杆及其应用

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8714754D0 (en) 1987-06-24 1987-07-29 Framo Dev Ltd Electrical conductor arrangements
DE4002795C1 (fr) * 1990-01-31 1991-05-23 Eastman Christensen Co., Salt Lake City, Utah, Us
CA2494871C (fr) * 2002-10-23 2011-09-27 Varco I/P, Inc. Tige de forage a passage electrique applique interieurement
US7084782B2 (en) * 2002-12-23 2006-08-01 Halliburton Energy Services, Inc. Drill string telemetry system and method
US7605715B2 (en) * 2006-07-10 2009-10-20 Schlumberger Technology Corporation Electromagnetic wellbore telemetry system for tubular strings

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2011134636A2 *

Also Published As

Publication number Publication date
WO2011134636A3 (fr) 2013-01-10
WO2011134636A2 (fr) 2011-11-03
DE102010018383A1 (de) 2011-10-27

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