EP1143104A1 - Verbundrohr mit eingebetteten Leitern - Google Patents

Verbundrohr mit eingebetteten Leitern Download PDF

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Publication number
EP1143104A1
EP1143104A1 EP00201215A EP00201215A EP1143104A1 EP 1143104 A1 EP1143104 A1 EP 1143104A1 EP 00201215 A EP00201215 A EP 00201215A EP 00201215 A EP00201215 A EP 00201215A EP 1143104 A1 EP1143104 A1 EP 1143104A1
Authority
EP
European Patent Office
Prior art keywords
tube
strip
tube according
composite
wall
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Withdrawn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
EP00201215A
Other languages
English (en)
French (fr)
Inventor
Gerrit Pieter Kamp
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.)
Airborne Development BV
Original Assignee
Airborne Development BV
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 Airborne Development BV filed Critical Airborne Development BV
Priority to EP00201215A priority Critical patent/EP1143104A1/de
Priority to AU46950/01A priority patent/AU4695001A/en
Priority to PCT/NL2001/000274 priority patent/WO2001075263A1/en
Publication of EP1143104A1 publication Critical patent/EP1143104A1/de
Withdrawn legal-status Critical Current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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/20—Flexible or articulated drilling pipes, e.g. flexible or articulated rods, pipes or cables
    • E21B17/206—Flexible or articulated drilling pipes, e.g. flexible or articulated rods, pipes or cables with conductors, e.g. electrical, optical

Definitions

  • the present invention relates generally to a composite tube for use inserted in or connected to a bore hole in the ground, such as in the exploration and the winning of oil and gas.
  • Composite tubing in particular composite tubing capable of being spooled upon a reel, is commonly used in numerous well operations, including running wire line cable down a lithosphere bore hole with well tools, working over wells by delivering various chemicals down hole and performing operations on the interior surface of the drill hole.
  • the spoolable composite tubes can be used in conjunction with one well and can then be transported on a reel to another well location.
  • the composite materials used comprise reinforcing fibers, such as carbon, glass or aramid, and a matrix material, such as a thermoplastic or thermosetting polymer, supporting the fibers.
  • composite coiled tubing Compared to steel tubing, composite coiled tubing has increased corrosion and fatigue resistance, combined with a high strength to weight ratio.
  • a recent development in composite tubing is to embed electric power conductors within the wall thickness of the composite tube to enable the use of electrically powered devices suspended on or attached to the tube.
  • data transmission is possible by superimposing a data signal on the power conduit.
  • Spoolable composite tubing comprising embedded power conductors as well as methods for their manufacture and the uses of such tubes in bore holes are disclosed in US 5 921 285 and WO 99/19653.
  • a problem associated with composite tubes with embedded power conductors is to embed a power conductor capable of conducting relatively large amounts of electrical energy in the tube wall without significantly compromising dimensions, strength, flexibility or structural integrity of the tube.
  • Such a conductor must be integrated in the tube wall without significantly decreasing its inner diameter and/or significantly increasing its outer diameter. Decreasing the inner diameter leads to a decrease of the area provided for fluid transport, while an increase in the outer diameter increases the dimension of a spool on which the tube is coiled, thus leading to transportation problems. Furthermore, increasing the outer diameter is often not desirable in view of the limited cross-sectional area of the bore hole.
  • It is an object of the present invention is to provide a spoolable composite tube having power conductors embedded in the tube wall capable of transmitting sufficient power for at least one downhole electric power tool such as a downhole electric drilling motor, an electric submersible pump or an electrical tractor, without significantly compromising its dimensions, strength, flexibility or structural integrity and particularly its ability to be bent to a small radius without being permanently deformed or damaged otherwise.
  • a downhole electric power tool such as a downhole electric drilling motor, an electric submersible pump or an electrical tractor
  • the conductor By configuring the conductor as a strip-like element, the cross-sectional area of the element in the tube wall can be relatively large.
  • the plurality of conducting filaments provide the conductor with a structure capable of accommodating to relatively large temporary deformations of surrounding material which occur during spooling of the tube to a relatively small radius.
  • each of the conductive filaments is at least partially oriented at an angle relative to the strip-like element of which it is a member.
  • each of the conductive filaments is at least partially oriented at an angle relative to the strip-like element of which it is a member.
  • the capability of accommodating to deformations of the tube and the ease of assembling the composite structure of the tube are further enhanced if the conductive filaments are braided, intertwined or braided and intertwined.
  • a braided and/or intertwined structure of the strip-like elements also provides the advantage that the filaments are bundled so that handling of the strip-like element or elements before integration in the tube wall is facilitated.
  • the filaments can for instance be interwoven separately, but can also be interwoven as strands.
  • the strip-like element may comprise both electrically conductive filaments and electrically non-conductive filaments.
  • the conductive and the non-conductive filaments can be interwoven.
  • the strip-like elements configured as flattened braids embedded in the tube wall thus provide a relatively large cross-sectional conductive area that can be arranged in the tube wall with a minimum impact on its dimensions, strength and wear-resistance.
  • the easily deformable structure of the braids provide for low deformation of the conductor filaments in the tube wall when the tube is bent.
  • the strip-like elements comprise a flattened tubular structure of crossingly interwoven strands of electrically conductive filaments, e.g. copper wires.
  • the longitudinally extending strip-like elements can be arranged in many configurations along at least a part of the tube's length, such as helically, as a sequence of S-turns or forming a zigzag pattern, the strip-like elements are preferably oriented substantially parallel to the tube axis.
  • the strip-like elements form a balanced composite structure so that that tensile, flexural and pressure loads exerted thereon do not induce torsional loads exerted onto the tube.
  • the concept of the electric power conductor embedded in the tube wall being formed by a flexible, strip-like element comprising a plurality of electrically conductive filaments is of particular advantage if at least two of the power conductors are included in the tube wall and positioned mutually spaced in circumferential sense of the tube. This because considerations regarding occupied cross-sectional area and mutual insulation are of particular importance if a plurality of power conductors is required.
  • the tube has equal bending stiffnesses in all directions.
  • the strip-like elements By arranging the strip-like elements to curvedly extend along a part of the circumference of the tube wall, it is achieved that the elements can be accommodated in a circumferential layer of the tube wall.
  • the strip-like elements or braids are curved substantially concentrically to the tube axis. This way, the radial thickness of a layer comprising the braids can be minimized.
  • the layer containing the braids can add to the structural strength of the tube. This way, the impact of the embedded conductors on the structure of the tube can be further reduced.
  • Such a non-conductive composite layer can also comprise an axially extending circumferential layer of electrically non-conductive composite material covering the strip-like elements on the outside and/or the inside, while the circumferential area between the strips is filled with a composite or a non-composite material, e.g. the matrix material of the composite material of the covering layers.
  • a composite or a non-composite material e.g. the matrix material of the composite material of the covering layers.
  • the electrically non-conductive layer with embedded strips can be manufactured relatively easily, e.g. by means of the thermoplastic tape winding process. It is also possible to provide that the electrically non-conductive layer inside of the strips also forms the inner liner.
  • the matrix material is applied by pre-impregnating before bringing the strip-like elements in the intended position.
  • voids in the braids can be reduced and mechanical and electrical behaviour can be improved.
  • the conductors can be manufactured in the same way as composite tapes, which facilitates manufacturing the tube by means of the thermoplastic tape winding process.
  • a tubular liner By providing the tube with a pressure resistant, inner tubular liner the pressure resistance of the tube can be increased.
  • a tubular liner can conveniently be used as a mandrel on which the composite layers are wound.
  • a tubular liner comprises a non-composite, thermoplastic material.
  • thermoplastic material in the tube wall allows local plastic deformation of the tube wall resulting in cracks being closed or evening out of other stress or wear-induced damage, in particular under influence of heat and/or incidental large deformation.
  • Figs. 1 and 2 show a composite tube 1.
  • the tube comprises a tube wall 2 having a number of circumferential layers axially extending along central axis A of the tube 1 in a laminar fashion.
  • the tube wall 2 comprises a central layer 3 of electrically non-conducting composite material.
  • the non-conducting layer of composite material comprises a thermoplastic matrix material, e.g. polyetherimide (PEI), polyphenylene sulfide (PPS), polyetheretherketone (PEEK), polyvinylidene fluoride (PVDF), polyethersulfone (PES), polysulfone (PSU), polyethylene terephthalate (PET), polyamideimide (PAI), polyurethane (PUR), polyamide (PA), polypropylene (PP) or polyimide (PI), reinforced with fiberglass or other fiber materials.
  • PEI polyetherimide
  • PPS polyphenylene sulfide
  • PEEK polyetheretherketone
  • PVDF polyvinylidene fluoride
  • PES polyethersulfone
  • PSU polyethylene terephthalate
  • PAI polyamideimide
  • PAUR polyurethane
  • PA polyamide
  • PP
  • the power conductors are each formed as a flexible strip-like element 4 comprising a plurality of electrically conductive, braided filaments.
  • the strip-like elements are formed as flat braids wherein strands 5 of copper wires 6 (fig. 1) that axially extend along axis A are arranged in a crossing fashion.
  • the angle between the axis of the strip and the axes of the conductive elements therein is preferably between 15° and 70° and preferably between 35° and 55°.
  • the flat, strip like elements 4 each have substantially equal dimensions and are distributed substantially equally along the circumference of the tube wall 2.
  • the thickness to width ratio of the strips is preferably between about 1:50 and about 1:3 and most preferably between about 1:20 and about 1:5.
  • Each element 4 is substantially flat and extends curvedly along a part of the circumference of the tube wall 2, the curvature being substantially concentrically to the tube axis A.
  • the electrically non-conductive composite layer 3 wherein the flexible, strip-like elements are embedded is composed of a radially outwardly and a radially inwardly disposed covering layer 3A, 3B covering the interposed strip-like elements 4, which are contained in an intermediate layer 3C.
  • the covering layers 3A, 3B comprise a thermoplastic matrix material having fiber reinforcements, while in this example the material of the intermediate layer 3C between the strips is a thermoplastic matrix material without fiber reinforcement.
  • the material of the intermediate layer 3C between the strips is a thermoplastic matrix material including fibers, for instance in the form of pultruded strips.
  • the flexible, strip-like elements are embedded.
  • the strip-like elements are impregnated with the thermoplastic matrix material.
  • the strip-like elements 4 are radially interposed between axially extending, electrically conductive composite circumferential layers 7A, 7B with carbon fibre as electrically conductive high strength material.
  • the layers can be made electrically conductive by adding conductive particles such as carbon black to the matrix material.
  • the tube 2 further comprises a pressure resistant inner tubular liner 8.
  • the liner 8 is preferably made of a non-composite thermoplastic material, such as: PEEK, PPS or PVDF, the particular choice being dependent on requirements for instance regarding operating conditions and chemical resistance.
  • the inner liner 8 carries the radially outwardly disposed circumferential layers 7B, 3B, 3C, 3A, 7A as a mandrel.
  • the tube 1 further comprises an axially extending corrosion resistant and/or impact resistant, radially outer circumferential shielding layer 9.
  • the shielding layer is preferably formed by a composite of PPS and wear resistant material such as glass fibers.
  • the tube wall 2 comprises axially extending optical fibers, schematically represented by dots 22, disposed in the electrically non-conductive layer for monitoring partial discharges generated by a voltage applied on the electrical conductive elements 4. This way, structural integrity of the insulating layers can be monitored.
  • the tube ends 10 comprise additionally reinforced wall portions of increased radial dimension.
  • the reinforced wall portions are used for attachment of a connector 11.
  • the connector 11 comprises an inner portion 12 for supporting the inner surface of the tube formed by the liner 8.
  • the connector 11 further comprises a cover mantle 13 for covering the outer surface of the tube which can be placed onto the inner portion 12 such that the inner portion 12 and the cover mantle 13 clampingly engage end wall portion 10 of the tube 1.
  • the inner portion 12 and the cover mantle 13 co-operate with the tube end 10 to form an anti-slip screw joint.
  • the inner portion 12 comprises electrically conductive portions (not shown) electrically connecting the strip-like elements 4 to sockets 14 forming electrical coupling means.
  • the connector 11 is used to enable an electrically conductive, torsion resistant connection of a metal coupler 15 to the composite tube 1.
  • the coupler 15 comprises an inner, tubular portion 16 carrying electrically conductive strips for engagement of the sockets 14.
  • the inner tubular portion 16 further comprises bores 18 that can be aligned with corresponding bores 19 in the inner portion 12. By providing pins through the bores 18, 19 a torsion resistant coupling can be achieved between the coupler 15 and the connector 11.
  • the coupler 15 comprises a connecting sleeve 20 which can extend over the connector 11 to provide a protective shield and has in inner thread engaging an outer thread of the connector 11 for axially urging the connector 11 against the coupler 15 with a pre-tension.
  • the coupler 15 can be used for coupling to a connector 11 of a further tube 1 or can be used to connect to drilling equipment, downhole tools or the like.
  • the tube 1 can advantageously be manufactured by means of the thermoplastic tape winding process, in which thermoplastic tapes of composite materials are wound onto the tubular inner liner 8 which serves as a mandrel.
  • the thermoplastic tape-winding process is discussed more in detail in 'On-line consolidation of thermoplastic matrix composite tape using ultrasonic heating', Bullock, Daniel E. and Boyce, Joseph, 39th International SAMPE Symposium April 11-14, 1994, p 1500-1506, which publication is incorporated herein by reference.
  • the tube 1 can be coiled on a reel, e.g. for transportation.
  • the tube 1 can be subsequently uncoiled from the reel and be inserted in a bore hole in the ground.
  • the use of the tubing is discussed more in detail in 'Coiled tubing technology continues its rapid growth', Ken Newman, World Oil, January 1998, p. 64-71, which publication is incorporated herein by reference.
  • the tube is preferably spoolable to a radius of curvature of 3 meter or smaller and preferably 2.3 to 1.8 meters or smaller at an outer tube diameter of 70 mm, i.e. to a radius of curvature of about 43 times or less, and preferably about 33-26 times or less the outer tube diameter.
  • the tube 1 in operation, if the tube is to be loaded by an internal pressure, the tube 1 is preferably spooled from a transport reel 23 onto a dispensing reel 24 having a larger diameter than the transport reel 23 before the tube is loaded with pressure. For inserting the tube 1 into the ground, the tube 1 is uncoiled from the dispensing reel 24. Thus, the tube 1 is loaded with internal pressure only while in a condition bent to the relatively large radius around the dispensing reel 24. Another advantage of using a relatively large dispensing reel is, that during repeated on-site spooling and unspooling, the tube does not need to be bent to the relatively small radius required for road transport, so that the life span of the tube is increased.
  • the tube 1 is equipped with a fishing tool 25 to be attached to an object to be retrieved from the bore hole 26.
  • the tube 1 is further equipped with a load monitor 27 communicating with a load display unit 28. Because the tube 1 is relatively light, it can easily be moved up several times to obtain a reading from the load display unit indicating whether attachment to the object to be retrieved has been realized. In many applications, the light weight of the tube also makes it possible to us the force required to pull the tube string upwards as an indication whether the tube has been coupled to the object to be retrieved.
  • Fig. 7 illustrates yet another application of the proposed tube 1 with integrated conductors 4.
  • the tube 1 is connected to a remote subsea unit 29 which may for instance include a pump and valves powered via a hydraulic line 30.
  • the tube 1 and the hydraulic line 30 are connected to a production platform 31 above sea level 33 and supported by the sea bottom 32. Since the tube 1 can be flexed substantially, it is also suitable to be used as a riser, the integrated power conductors 4 obviating the need of separate, and easily damaged electric cables for controlling valves in the subsea unit 29 or, alternatively, the need of providing a plurality of hydraulic lines controlled by valves at the production platform.
  • the tube wall 2 may comprise a higher or lower number of layers.
  • the tube may comprise composite layers having thermoset matrix material.
  • the tube may comprise two or more than three flexible strip-like conductors.
  • the strip-like elements can be covered by radially inwardly and radially outwardly disposed separate layers of non-conductive material, while the circumferential areas between the strips are filled with a different, non-conductive material.
  • the strip-like elements can be provided with a non-conductive cover layer.
  • adjacent composite layers may comprise the same matrix material and/or a composite layer adjacent to a non-composite layer may comprise the material of the non-composite material as matrix material. If two layers containing different matrix materials are to be bonded to each other the bonding can generally be improved by providing an intermediate layer of matrix material blended from the matrix materials of the composite layers to be bonded.
EP00201215A 2000-04-03 2000-04-03 Verbundrohr mit eingebetteten Leitern Withdrawn EP1143104A1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP00201215A EP1143104A1 (de) 2000-04-03 2000-04-03 Verbundrohr mit eingebetteten Leitern
AU46950/01A AU4695001A (en) 2000-04-03 2001-04-03 A composite tube with embedded power conductors
PCT/NL2001/000274 WO2001075263A1 (en) 2000-04-03 2001-04-03 A composite tube with embedded power conductors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP00201215A EP1143104A1 (de) 2000-04-03 2000-04-03 Verbundrohr mit eingebetteten Leitern

Publications (1)

Publication Number Publication Date
EP1143104A1 true EP1143104A1 (de) 2001-10-10

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Family Applications (1)

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EP00201215A Withdrawn EP1143104A1 (de) 2000-04-03 2000-04-03 Verbundrohr mit eingebetteten Leitern

Country Status (3)

Country Link
EP (1) EP1143104A1 (de)
AU (1) AU4695001A (de)
WO (1) WO2001075263A1 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018052699A1 (en) * 2016-08-31 2018-03-22 Saudi Arabian Oil Company Fiber reinforced and powered coil tubing
US11371326B2 (en) 2020-06-01 2022-06-28 Saudi Arabian Oil Company Downhole pump with switched reluctance motor
US11499563B2 (en) 2020-08-24 2022-11-15 Saudi Arabian Oil Company Self-balancing thrust disk
US11591899B2 (en) 2021-04-05 2023-02-28 Saudi Arabian Oil Company Wellbore density meter using a rotor and diffuser
US11644351B2 (en) 2021-03-19 2023-05-09 Saudi Arabian Oil Company Multiphase flow and salinity meter with dual opposite handed helical resonators
US11913464B2 (en) 2021-04-15 2024-02-27 Saudi Arabian Oil Company Lubricating an electric submersible pump
US11920469B2 (en) 2020-09-08 2024-03-05 Saudi Arabian Oil Company Determining fluid parameters

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2478442A1 (en) 2002-03-08 2003-09-18 Shell Canada Limited Steerable soil penetration system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE566390A (de) *
GB2283035A (en) * 1993-10-25 1995-04-26 Camco Int Coiled tubing with signal transmitting passageway
WO1999019653A1 (en) 1997-10-10 1999-04-22 Fiberspar Spoolable Products, Inc. Composite spoolable tube with sensor
US5921285A (en) 1995-09-28 1999-07-13 Fiberspar Spoolable Products, Inc. Composite spoolable tube

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE566390A (de) *
GB2283035A (en) * 1993-10-25 1995-04-26 Camco Int Coiled tubing with signal transmitting passageway
US5921285A (en) 1995-09-28 1999-07-13 Fiberspar Spoolable Products, Inc. Composite spoolable tube
WO1999019653A1 (en) 1997-10-10 1999-04-22 Fiberspar Spoolable Products, Inc. Composite spoolable tube with sensor

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
BULLOCK,DANIEL E. AND BOYCE,JOSEPH: "On-line consolidation of thermoplastic matrix composite using ultrasonic heating", 39TH INTERNATIONALSAMPLE SYMPOSIUM, 11 April 1994 (1994-04-11) - 14 April 1994 (1994-04-14), pages 1500 - 1506
KEN NEWMAN: "coiled tubing technology continues its rapid growth", WORLD OIL (JANUARY 1998), pages 64 - 71

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018052699A1 (en) * 2016-08-31 2018-03-22 Saudi Arabian Oil Company Fiber reinforced and powered coil tubing
US10844673B2 (en) 2016-08-31 2020-11-24 Saudi Arabian Oil Company Fiber reinforced and powered coil tubing
US11371326B2 (en) 2020-06-01 2022-06-28 Saudi Arabian Oil Company Downhole pump with switched reluctance motor
US11499563B2 (en) 2020-08-24 2022-11-15 Saudi Arabian Oil Company Self-balancing thrust disk
US11920469B2 (en) 2020-09-08 2024-03-05 Saudi Arabian Oil Company Determining fluid parameters
US11644351B2 (en) 2021-03-19 2023-05-09 Saudi Arabian Oil Company Multiphase flow and salinity meter with dual opposite handed helical resonators
US11591899B2 (en) 2021-04-05 2023-02-28 Saudi Arabian Oil Company Wellbore density meter using a rotor and diffuser
US11913464B2 (en) 2021-04-15 2024-02-27 Saudi Arabian Oil Company Lubricating an electric submersible pump

Also Published As

Publication number Publication date
WO2001075263A1 (en) 2001-10-11
AU4695001A (en) 2001-10-15

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