WO1980000727A1 - Ameliorations se rapportant a la transmission d'energie electrique dans des puits de fluide - Google Patents

Ameliorations se rapportant a la transmission d'energie electrique dans des puits de fluide Download PDF

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Publication number
WO1980000727A1
WO1980000727A1 PCT/GB1979/000158 GB7900158W WO8000727A1 WO 1980000727 A1 WO1980000727 A1 WO 1980000727A1 GB 7900158 W GB7900158 W GB 7900158W WO 8000727 A1 WO8000727 A1 WO 8000727A1
Authority
WO
WIPO (PCT)
Prior art keywords
casing
electrically
borehole
tube
section
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.)
Ceased
Application number
PCT/GB1979/000158
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English (en)
Inventor
S Horchler
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.)
UK Secretary of State for Energy
Original Assignee
UK Secretary of State for Energy
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 UK Secretary of State for Energy filed Critical UK Secretary of State for Energy
Publication of WO1980000727A1 publication Critical patent/WO1980000727A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • 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
    • 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

Definitions

  • This invention relates to the passage of electrical power along the tubing string of a borehole which has particular reference to the downhole monitoring of some parameter (e.g. pressure, temperature or fluid velocity) relevant to the pro ⁇ duction of a borehold for a fluid well or the extraction of fluid (e.g. oil or gas) from such a borehole after its produc ⁇ tion.
  • the invention also extends to a borehole per se adapted for such passage of electrical power.
  • the invention relates to a method of transmitting electrical power along a borehole comprising a electrically-conducting string located within an electrically-
  • an electrical sensor producing an electrical output related to a parameter sensed down the hole has its output connected between the lower end of said section 5and the lower tube and the output from the sensor is monitored at the wellhead by connections between the upper end of said section and an upper part of the casing.
  • the sensor can be of a kind powered by a low voltage dc a this can be fed down the said section from the wellhead or gen 0ated in situ using a turbine generator (powered by mud, oil or gas).
  • the insulating centralisers are employed to prevent short circuiting between the said section and the surrounding casing and insulating tube centralisers are preferred which are 5 clamped at intervals around the tubing string and bear on the internal surface of the casing. Crude oil or diesel oil can be located in the annular volume between the tubing string and the casing.
  • the invention finds particular utility in a downhole pressure monitoring system (using a pressure-sensing oscil ⁇ lator unit whose output frequency is related to the subsis- ting pressure), but the method of the invention can be used for example for measuring temperature, electrical conductivity, radioactivity, flow velocity, the presence of specified chemi ⁇ cals and indeed any useful parameter for which a suitable sensor can be found.
  • a con ⁇ ducting paste e.g. incorporating a silver or graphite pow ⁇ der
  • the invention also embraces the special equipment needed to isolate a major section of the tubing string from its ends and from the casing and thus extends to the isolating subs, an insulating collar for the tubing string and an insulating coupling for the DHSV control line.
  • a borehole comprising an electrically conducting casing de ⁇ fining the outer extremity of the borehole, and an electrically conducting tubing string extending substantially concentri ⁇ cally through the casing between upper and lower regions there- of,.
  • the tubing string has a central section which is electrically isolated from the said upper and lower regions by a pair of subs and from the surrounding casing by a plurality of spaced-apart electrically insulating centralisers, each sub comprising first and second aligned tube lengths, each of which lengths terminates at its axially outer end in a screw-threaded section and at its axially inner end in an annular face which confronts the annular face of the other tube length, a first electrically insulating ring dis ⁇ posed between said annular faces to space the tube lengths apart and a locking collar having a shoulder confronting a shoulder on said first tube length and a screw-threaded por ⁇ tion engaged in threads on the second tube length, a second electrically insulating ring to space the shoulders apart and an insulating sleeve to space the locking collar from the first tube length, the locking collar being tightened on the second tube length to compress the two insulating rings and rigidly clamp the tube lengths together,
  • each sub is constructed to withstand a tension applied between the tapered threaded sections of the outer ends of the tube lengths of at least 180000 Kgs.
  • the locking collar includes a cable terminal 15to ensure low ohmic contact to the second tube length.
  • the interior of the tube lengths are coated with electrically insulating material to increase the length of any shorting path available between opposite ends of the sub through the medium of the liquid flowing through the 20tube lengths in use of the sub.
  • Each insulating centraliser can be a ring of electricall insulating material (e.g. PTFE or fibre-reinforced resin) clamped around the outside of the tubing string by metallic ring -shackles which include narrow bearings for engaging the 5casing over localised regions spaced-apart around the periphe of the inner wall of the casing.
  • electricall insulating material e.g. PTFE or fibre-reinforced resin
  • the isolator need only provide an electrical break while main ⁇ taining a seal capable of withstanding the operating pressure 0of the valve and a variety of simple connections are available for this.
  • Figure 1 is a schematic representation of a borehole in accordance with the invention and adapted for downhole moni ⁇ toring in accordance with the method of the invention
  • Figure 3 is an end view of the sub shown in Figure 2
  • Figure is a sectional view of the- insulating coupling in the wellhead of Figure 1 in the control line of the DHSV
  • Figure 5 is an end view of a tube centraliser used in the well of Figure 1, and
  • Figure 6 is a sectional view of the centraliser of Figure 5 taken on the line VI-VI.
  • Figure 1 represents schematically a production oil well, the casing being indicated at 1, the tubing string at 2, the wellhead tubing hanger at 3 and the downhole packer at 4.
  • a DHSV is located near the upper end of the string 2 and the control line for this is shown at 5.
  • the casing 1 would have a diameter of about 25 cms and the string 2 a diameter of around 11cms.
  • the dotted region of Figure 1 could be several thousands of metres in length.
  • 10 represents a known type of pressure- sensitive oscillator (e.g.
  • a Hewlett-Packard HP 2 ⁇ ll8 which generates an ac output (pulsed) when fed with a low voltage dc input, the frequency of the ac output being related to the pressure to which the oscillator is subjected.
  • the oscillator could measure pressures between 70 to 850 bars and over that range the output would range between 500 Hertz and 15000 Hertz.
  • the oscillator 10 is to be used for continually monitoring the pressure in the oil in the vicinity of the packer 4, so that there is a need to supply it with a low voltage dc current (e.g.
  • the isolating subs 11 can each have the form shown in Figures 2 and 3, the sub being oriented so that the arrow X points upwards if the sub is used at the wellhead and so it points downwards if the sub is used at the downhole end of the string 2. It is convenient to use a similar design of su at each end of the isolated section of the string, although the strength requirement of the lower sub is much less than that of the upper sub.
  • the sub comprises a first tube length 14 and a second tube length 15 which are locked together by a locking collar l ⁇ .
  • the outer ends of the lengths 14 and 15 are provided with conven ⁇ tional tapered threads 17 (only shown for the first tube length) to enable the sub to be joined into the string by normal oilwell techniques.
  • the confronting annular faces 14a and 15a of the tube lengths are spaced apart by a first in ⁇ sulating ring 18 located in recesses formed in the faces 14a and 15a.
  • Annular seals 18a e.g. Wills rings
  • the locking collar l ⁇ is threaded to the length 15 at 19 and has a shoulder 20 which compresses a second insulating ring 21 against a shoulder 22 of the first length 14.
  • An insulating sleeve 23 ensures that the locking collar l ⁇ does not make any electrical contact wit the tube length 13-
  • the locking collar is tightened in place by means of four radial grooves 24 (see Figure 3) and carries an annular bushing 25 of electrically insulating material to space it from the casing 1 (shown by chain lines in Figure 2).
  • the electrical connection (A in Figure 1) to the isolated section of the string (of which length 15 is a part) is made via the cable 26 shown in Figure 2.
  • Grooves 27 in the bushing 25 allow the control line 5 to pass within the casing to the DHSV.
  • the lower sub 11 is inverted with respect to the upper sub and thus serves to electrically isolate the central part of the string 2 from the lowermost part which is in electrical contact with the packer 4, and, via the packer 4, with the casing 1.
  • Figure 7 shows one way of mounting the sensor 10.
  • a recess 30 can be formed in the wall of the tube length 14 and the cable 26 can connect directly to one input terminal and one output terminal of the sensor 10.
  • the connection 31 shown in Figure 7 allows the cable 26 to.pass into the re- cess 30 in a pressure-tight manner without making electrical contact with the tube length 14.
  • the casing of the sensor 10 is electrically connected to the tube length 14 (via the clamping rings 32) and this electrically connects the other input terminal and the other output terminal to the bottom end of the string 2, and via the packer 4, to the casing 1.
  • the annular cen ⁇ tralisers shown in Figures 5 and 6 are employed.
  • One pipe of the string 2 is shown at 40 in Figures 5 and 6 and this is spaced from the casing 1 by a metal ring shackle 4l clamped around an insulating sleeve 42.
  • Both the sleeve 42 ' and the shackle 41 are in two parts for easy application around a pipe as the string is being formed at the wellhead.
  • the shackle is provided with four equally spaced ears 4la, which bear on the casing 1 to centralise the string 2 and prevent electrical contact between the two.
  • the annular volume 43 is filled with an electrically insulating liquid (e.g. diesel oil) during use to ensure that a high ohmic resistance is maintained between the string and the casing, during operation of the monitoring method of the invention.
  • an electrically insulating liquid e.g. diesel oil
  • any pockets of water in the annular volume would drama ⁇ tically reduce the ohmic resistance (particularly if they were saline and bridged across between the string and the casing) it may be desirable to include an emulsifying agent in the o to ensure that any water present is held as a water-in-oil emulsion.
  • FIG. 4 shows the insulating coupling 13 in the contro line - From the drawing it can be seen that the insulating rings 13a and 13b prevent electrical connection between the inlet pipe and the remainder of the coupling.
  • the " ac pulses appearing between points "A" and "B" at the wellhead can be taken off by conventional connections and leads to suitable monitoring equipment either in the vic nity of the wellhead (e.g. on an offshore platform) or tele ⁇ metered to a remote location.
  • suitable monitoring equipment either in the vic nity of the wellhead (e.g. on an offshore platform) or tele ⁇ metered to a remote location.
  • the equipment used for the pr cessing of the information received from the sensor 10 can b conventional and apart from mentioning the possible need of an amplifying stage across the points "A", "B” (the output signals can be seriously attenuated in their passage to the wellhead) will not be further commented on here.
  • the provision of the insulated section in the tubing string enables electrical power to be fed to downhole equipment from the wellhead and this represen a further advantage in practice.

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geophysics (AREA)
  • Remote Sensing (AREA)
  • Mechanical Engineering (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Earth Drilling (AREA)
  • Housings And Mounting Of Transformers (AREA)

Abstract

Methode et appareil de transmission de l'energie electrique le long d'un alesage d'un puit de petrole ou de gaz en cours de perforation ou en production. L'invention s'applique particulierement au controle en profondeur dans le trou, un capteur electrique (10) pour le parametre particulier envoyant ses signaux de sortie a A' B' et via, respectivement, une section centrale isolee du cordon du tube (2) et de l'enveloppe (1) ces signaux etant retires en A, B pour un controle ou surveillance approprie. Un sous-isolant (11) pour l'isolation electrique de la section centrale du cordon est decrit.
PCT/GB1979/000158 1978-09-29 1979-09-28 Ameliorations se rapportant a la transmission d'energie electrique dans des puits de fluide Ceased WO1980000727A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7838597 1978-09-29
GB7838597 1978-09-29

Publications (1)

Publication Number Publication Date
WO1980000727A1 true WO1980000727A1 (fr) 1980-04-17

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ID=10499979

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1979/000158 Ceased WO1980000727A1 (fr) 1978-09-29 1979-09-28 Ameliorations se rapportant a la transmission d'energie electrique dans des puits de fluide

Country Status (3)

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EP (1) EP0020416A1 (fr)
GB (1) GB2055131B (fr)
WO (1) WO1980000727A1 (fr)

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0070668A1 (fr) * 1981-07-17 1983-01-26 Angus Fire Armour Limited Tuyau flexible et méthode pour attacher un article allongé, en particulier un câble, sur le tuyau flexible
US4839644A (en) * 1987-06-10 1989-06-13 Schlumberger Technology Corp. System and method for communicating signals in a cased borehole having tubing
EP0339825A1 (fr) * 1988-04-29 1989-11-02 Utilx Corporation Dispositif de transmission d'informations dans un puits de forage
EP0721053A1 (fr) * 1995-01-03 1996-07-10 Shell Internationale Researchmaatschappij B.V. Système de fond de puits pour la transmission de l'électricité
WO2000046479A1 (fr) * 1999-02-01 2000-08-10 Shell Internationale Research Maatschappij B.V. Puits multilateral et systeme de transmission electrique
WO2001055554A1 (fr) * 2000-01-24 2001-08-02 Shell Internationale Research Maatschappij B.V. Systeme de telemetrie bidirectionnel sans fil de fond
WO2001065066A1 (fr) * 2000-03-02 2001-09-07 Shell Internationale Research Maatschappij B.V. Tubage de revetement de puits utilisant la communication sans fil
WO2002004781A1 (fr) * 2000-06-30 2002-01-17 Brunel Oilfield Services (Uk) Limited Centreur non conducteur
US6715550B2 (en) 2000-01-24 2004-04-06 Shell Oil Company Controllable gas-lift well and valve
US6817412B2 (en) * 2000-01-24 2004-11-16 Shell Oil Company Method and apparatus for the optimal predistortion of an electromagnetic signal in a downhole communication system
US6840317B2 (en) 2000-03-02 2005-01-11 Shell Oil Company Wireless downwhole measurement and control for optimizing gas lift well and field performance
US6840316B2 (en) 2000-01-24 2005-01-11 Shell Oil Company Tracker injection in a production well
US6851481B2 (en) 2000-03-02 2005-02-08 Shell Oil Company Electro-hydraulically pressurized downhole valve actuator and method of use
US6868040B2 (en) 2000-03-02 2005-03-15 Shell Oil Company Wireless power and communications cross-bar switch
US6981553B2 (en) 2000-01-24 2006-01-03 Shell Oil Company Controlled downhole chemical injection
US7055592B2 (en) 2000-01-24 2006-06-06 Shell Oil Company Toroidal choke inductor for wireless communication and control
US7075454B2 (en) 2000-03-02 2006-07-11 Shell Oil Company Power generation using batteries with reconfigurable discharge
US7073594B2 (en) 2000-03-02 2006-07-11 Shell Oil Company Wireless downhole well interval inflow and injection control
US7114561B2 (en) 2000-01-24 2006-10-03 Shell Oil Company Wireless communication using well casing
US7147059B2 (en) 2000-03-02 2006-12-12 Shell Oil Company Use of downhole high pressure gas in a gas-lift well and associated methods
US7170424B2 (en) 2000-03-02 2007-01-30 Shell Oil Company Oil well casting electrical power pick-off points
US7259688B2 (en) 2000-01-24 2007-08-21 Shell Oil Company Wireless reservoir production control
US7322410B2 (en) 2001-03-02 2008-01-29 Shell Oil Company Controllable production well packer
WO2015047875A1 (fr) * 2013-09-18 2015-04-02 Chevron U.S.A. Inc. Vanne de sécurité de subsurface à alimentation électrique et à commande de surface
US9267334B2 (en) 2014-05-22 2016-02-23 Chevron U.S.A. Inc. Isolator sub
US9316063B2 (en) 2012-11-29 2016-04-19 Chevron U.S.A. Inc. Transmitting power within a wellbore
US9670739B2 (en) 2012-11-29 2017-06-06 Chevron U.S.A. Inc. Transmitting power to gas lift valve assemblies in a wellbore
CN107503741A (zh) * 2017-09-11 2017-12-22 中国矿业大学 一种用于煤矿井下采空区温度探测的随钻测温钻具

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* Cited by examiner, † Cited by third party
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DE19920799A1 (de) 1999-05-06 2000-11-16 Basf Coatings Ag Thermisch und mit aktinischer Strahlung härtbarer Beschichtungsstoff und seine Verwendung
EP2338510A1 (fr) 2002-07-19 2011-06-29 Novartis Pharma AG Compositions de vaccin contenant des analyses d'antigène bêta1-6 amyloïde
BRPI0922561A2 (pt) 2008-12-09 2020-08-11 Pfizer Vaccines Llc vacina de peptídeo de ch3 da ige.
WO2011027257A2 (fr) 2009-09-03 2011-03-10 Pfizer Vaccines Llc Vaccin pcsk9

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US1985229A (en) * 1929-12-27 1934-12-25 Sullivan Machinery Co Drilling apparatus
US2000716A (en) * 1934-04-07 1935-05-07 Geophysical Service Inc Insulated electrical connection
US2400170A (en) * 1942-08-29 1946-05-14 Stanolind Oil & Gas Co Time cycle telemetering
US2667626A (en) * 1950-01-23 1954-01-26 Bendix Aviat Corp Telemetering system for wells
US2690934A (en) * 1950-08-28 1954-10-05 Samuel M Holcombe Insulated sucker rod and tubing to prevent electrolysis and corrosion
US2925251A (en) * 1954-03-05 1960-02-16 Jan J Arps Earth well borehole drilling and logging system
US2941784A (en) * 1955-07-05 1960-06-21 Atlantic Refining Co Logging while drilling
GB1065834A (en) * 1964-01-15 1967-04-19 Vni I Pk I Kompleksnoi Avtom N Device for transmitting signals
US3866678A (en) * 1973-03-15 1975-02-18 Texas Dynamatics Apparatus for employing a portion of an electrically conductive fluid flowing in a pipeline as an electrical conductor
US3963075A (en) * 1975-03-27 1976-06-15 Evans Orde R Centralizer for elastomer coated blast joint
US4066995A (en) * 1975-01-12 1978-01-03 Sperry Rand Corporation Acoustic isolation for a telemetry system on a drill string

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1985229A (en) * 1929-12-27 1934-12-25 Sullivan Machinery Co Drilling apparatus
US2000716A (en) * 1934-04-07 1935-05-07 Geophysical Service Inc Insulated electrical connection
US2400170A (en) * 1942-08-29 1946-05-14 Stanolind Oil & Gas Co Time cycle telemetering
US2667626A (en) * 1950-01-23 1954-01-26 Bendix Aviat Corp Telemetering system for wells
US2690934A (en) * 1950-08-28 1954-10-05 Samuel M Holcombe Insulated sucker rod and tubing to prevent electrolysis and corrosion
US2925251A (en) * 1954-03-05 1960-02-16 Jan J Arps Earth well borehole drilling and logging system
US2941784A (en) * 1955-07-05 1960-06-21 Atlantic Refining Co Logging while drilling
GB1065834A (en) * 1964-01-15 1967-04-19 Vni I Pk I Kompleksnoi Avtom N Device for transmitting signals
US3866678A (en) * 1973-03-15 1975-02-18 Texas Dynamatics Apparatus for employing a portion of an electrically conductive fluid flowing in a pipeline as an electrical conductor
US4066995A (en) * 1975-01-12 1978-01-03 Sperry Rand Corporation Acoustic isolation for a telemetry system on a drill string
US3963075A (en) * 1975-03-27 1976-06-15 Evans Orde R Centralizer for elastomer coated blast joint

Cited By (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4470433A (en) * 1981-07-17 1984-09-11 Vipond Stanley N Hose
EP0070668A1 (fr) * 1981-07-17 1983-01-26 Angus Fire Armour Limited Tuyau flexible et méthode pour attacher un article allongé, en particulier un câble, sur le tuyau flexible
US4839644A (en) * 1987-06-10 1989-06-13 Schlumberger Technology Corp. System and method for communicating signals in a cased borehole having tubing
EP0295178A3 (fr) * 1987-06-10 1992-01-08 Schlumberger Limited Dispositif et procédé pour communiquer des signaux dans un puits armé muni de tubes
EP0339825A1 (fr) * 1988-04-29 1989-11-02 Utilx Corporation Dispositif de transmission d'informations dans un puits de forage
EP0721053A1 (fr) * 1995-01-03 1996-07-10 Shell Internationale Researchmaatschappij B.V. Système de fond de puits pour la transmission de l'électricité
WO1996021085A1 (fr) * 1995-01-03 1996-07-11 Shell Internationale Research Maatschappij B.V. Dispositif de transmission d'electricite de fond de trou
US5745047A (en) * 1995-01-03 1998-04-28 Shell Oil Company Downhole electricity transmission system
RU2149261C1 (ru) * 1995-01-03 2000-05-20 Шелл Интернэшнл Рисерч Маатсхаппий Б.В. Система передачи электричества вниз по стволу скважины
US6318457B1 (en) 1999-02-01 2001-11-20 Shell Oil Company Multilateral well and electrical transmission system
WO2000046479A1 (fr) * 1999-02-01 2000-08-10 Shell Internationale Research Maatschappij B.V. Puits multilateral et systeme de transmission electrique
MY120832A (en) * 1999-02-01 2005-11-30 Shell Int Research Multilateral well and electrical transmission system
US6840316B2 (en) 2000-01-24 2005-01-11 Shell Oil Company Tracker injection in a production well
WO2001055554A1 (fr) * 2000-01-24 2001-08-02 Shell Internationale Research Maatschappij B.V. Systeme de telemetrie bidirectionnel sans fil de fond
US7259688B2 (en) 2000-01-24 2007-08-21 Shell Oil Company Wireless reservoir production control
US7114561B2 (en) 2000-01-24 2006-10-03 Shell Oil Company Wireless communication using well casing
US7055592B2 (en) 2000-01-24 2006-06-06 Shell Oil Company Toroidal choke inductor for wireless communication and control
US6715550B2 (en) 2000-01-24 2004-04-06 Shell Oil Company Controllable gas-lift well and valve
US6817412B2 (en) * 2000-01-24 2004-11-16 Shell Oil Company Method and apparatus for the optimal predistortion of an electromagnetic signal in a downhole communication system
US6981553B2 (en) 2000-01-24 2006-01-03 Shell Oil Company Controlled downhole chemical injection
US7170424B2 (en) 2000-03-02 2007-01-30 Shell Oil Company Oil well casting electrical power pick-off points
US7147059B2 (en) 2000-03-02 2006-12-12 Shell Oil Company Use of downhole high pressure gas in a gas-lift well and associated methods
US6868040B2 (en) 2000-03-02 2005-03-15 Shell Oil Company Wireless power and communications cross-bar switch
WO2001065066A1 (fr) * 2000-03-02 2001-09-07 Shell Internationale Research Maatschappij B.V. Tubage de revetement de puits utilisant la communication sans fil
US6840317B2 (en) 2000-03-02 2005-01-11 Shell Oil Company Wireless downwhole measurement and control for optimizing gas lift well and field performance
GB2376968A (en) * 2000-03-02 2002-12-31 Shell Int Research Wireless communication using well casing
GB2376968B (en) * 2000-03-02 2004-03-03 Shell Int Research Wireless communication in a petroleum well
US7075454B2 (en) 2000-03-02 2006-07-11 Shell Oil Company Power generation using batteries with reconfigurable discharge
US7073594B2 (en) 2000-03-02 2006-07-11 Shell Oil Company Wireless downhole well interval inflow and injection control
US6851481B2 (en) 2000-03-02 2005-02-08 Shell Oil Company Electro-hydraulically pressurized downhole valve actuator and method of use
GB2381284A (en) * 2000-06-30 2003-04-30 Brunel Oilfield Services Nonconductive centralizer
WO2002004781A1 (fr) * 2000-06-30 2002-01-17 Brunel Oilfield Services (Uk) Limited Centreur non conducteur
GB2381284B (en) * 2000-06-30 2006-01-04 Brunel Oilfield Services Non-conductive centraliser
US7322410B2 (en) 2001-03-02 2008-01-29 Shell Oil Company Controllable production well packer
US9316063B2 (en) 2012-11-29 2016-04-19 Chevron U.S.A. Inc. Transmitting power within a wellbore
US9670739B2 (en) 2012-11-29 2017-06-06 Chevron U.S.A. Inc. Transmitting power to gas lift valve assemblies in a wellbore
WO2015047875A1 (fr) * 2013-09-18 2015-04-02 Chevron U.S.A. Inc. Vanne de sécurité de subsurface à alimentation électrique et à commande de surface
US9267334B2 (en) 2014-05-22 2016-02-23 Chevron U.S.A. Inc. Isolator sub
CN107503741A (zh) * 2017-09-11 2017-12-22 中国矿业大学 一种用于煤矿井下采空区温度探测的随钻测温钻具
CN107503741B (zh) * 2017-09-11 2023-08-15 中国矿业大学 一种用于煤矿井下采空区温度探测的随钻测温钻具

Also Published As

Publication number Publication date
EP0020416A1 (fr) 1981-01-07
GB2055131B (en) 1982-12-15
GB2055131A (en) 1981-02-25

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