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WO2021030726A1 - Réadaptation de canalisations pour câbles électriques - Google Patents

Réadaptation de canalisations pour câbles électriques Download PDF

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Publication number
WO2021030726A1
WO2021030726A1 PCT/US2020/046456 US2020046456W WO2021030726A1 WO 2021030726 A1 WO2021030726 A1 WO 2021030726A1 US 2020046456 W US2020046456 W US 2020046456W WO 2021030726 A1 WO2021030726 A1 WO 2021030726A1
Authority
WO
WIPO (PCT)
Prior art keywords
pipeline
conduit
electrical cable
existing
volume
Prior art date
Application number
PCT/US2020/046456
Other languages
English (en)
Inventor
William H. HASTINGS
John Walter II FLUHARTY
Herbert Fluharty
Daniel Henry TAIT
Ronald G. Halderman
Original Assignee
Quanta Associates, L.P.
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
Priority claimed from US16/682,952 external-priority patent/US11095101B2/en
Application filed by Quanta Associates, L.P. filed Critical Quanta Associates, L.P.
Priority to CA3117602A priority Critical patent/CA3117602A1/fr
Publication of WO2021030726A1 publication Critical patent/WO2021030726A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
    • H02G1/06—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for laying cables, e.g. laying apparatus on vehicle
    • H02G1/08—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for laying cables, e.g. laying apparatus on vehicle through tubing or conduit, e.g. rod or draw wire for pushing or pulling
    • H02G1/081—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for laying cables, e.g. laying apparatus on vehicle through tubing or conduit, e.g. rod or draw wire for pushing or pulling using pulling means at cable ends, e.g. pulling eyes or anchors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G9/00—Installations of electric cables or lines in or on the ground or water
    • H02G9/06—Installations of electric cables or lines in or on the ground or water in underground tubes or conduits; Tubes or conduits therefor

Definitions

  • the disclosure relates to the field of electric power infrastructure; existing oil and gas pipeline, or other pipelines which are no longer in use for their original purpose; for installation of conduits and electrical cables/conduits, typically underground, for electric power transmission; and the ampacity of electrical cables.
  • the present disclosure generally relates to embodiments of methods for repurposing a pipeline for electrical cables/conduits or electrical power lines. More specifically, the disclosure relates to the field of electric power infrastructure and repurposing existing oil and gas pipeline, or other pipelines which are no longer in use for their original purpose, for installation of conduits and electrical cables/conduits, typically underground, for electric power transmission.
  • the present disclosure relates to embodiments of a thixotropic non-cementitious thermal grout and methods of use with cables/conduits or electrical power lines.
  • the present disclosure relates to embodiments of an apparatus utilizing an existing underground pipeline.
  • the meaning of transmission is hereby defined to include electrical distribution.
  • repurposing is hereby defined to include reusing, renewing, recycling, restoring, and/or remodeling.
  • hot spot is hereby defined to include a high temperature area or location of high/maximum thermal stress caused by ineffective heat dissipation in an electrical cable and may be somewhat dependent upon location of and/or quality/condition of an electrical cable splice.
  • Fig. 1 depicts a sectional schematic view of an exemplary embodiment of a portion of an existing underground pipeline being repurposed for electrical cable/conductor/conduit.
  • Fig. 2 shows a sectional schematic view of an exemplary embodiment of a portion of an existing underground pipeline being repurposed for electrical cable/conductor/conduit.
  • Fig. 3 depicts a sectional schematic view of an exemplary embodiment of a repurposed existing underground pipeline having conduit, cable, and sensing fiber installed for a High Voltage Alternating Current (FIVAC) transmission system.
  • Fig. 4 shows a sectional schematic view of an exemplary embodiment of a repurposed existing underground pipeline having conduit, cable, and sensing fiber installed for a High Voltage Direct Current (HVDC) transmission system.
  • HVDC High Voltage Direct Current
  • Fig. 5 depicts a sectional schematic view of an exemplary embodiment of a repurposed existing underground pipeline having conduit, cable, and sensing fiber installed for a High Voltage Alternating Current (HVAC) transmission system.
  • HVAC High Voltage Alternating Current
  • Fig. 6 shows a sectional schematic view of an exemplary embodiment of a repurposed existing underground pipeline having conduit, cable, and sensing fiber installed for a High Voltage Direct Current (HVDC) transmission system.
  • HVDC High Voltage Direct Current
  • Fig. 7 depicts a flowchart of an exemplary method for repurposing an existing pipeline for introduction of electrical power lines.
  • Fig. 8 depicts a sectional schematic view of an exemplary embodiment of a portion of an existing underground pipeline of Fig. 1 being repurposed for electrical cable/conductor/conduit.
  • FIG. 1 shows a sectional schematic view of an exemplary embodiment of a portion of an existing underground oil and gas pipeline 20 being repurposed for electrical cable/conductor (shown in Figs. 3 and 4).
  • Existing pipeline 20 may typically be underground or in an underground environment 12 beneath the ground surface 10.
  • Existing pipeline being repurposed may be existing oil and gas pipeline, or other pipelines which are no longer in use for their original purpose.
  • other existing underground pipelines which are no longer in use may be repurposed for electrical cable/conductor/conduit, for example, existing original purpose oil pipeline, existing original purpose gas pipeline, or existing original purpose water pipeline.
  • Existing pipeline 20 may be cleaned, if needed, which may include evacuating contents. Cleaning may utilize one or more pigs. A cleaning pig may be, by way of example only, a foam pig. Evacuation of contents beyond cleaning may be performed.
  • Evaluation or inspection may utilize one or more pigs and/or smart or intelligent pigs.
  • evaluation or inspection may utilize a GPS (global positioning satellite) mapping pig.
  • Evaluation or inspection may involve caliper tools, geometry survey tools, and/or mapping tools.
  • Evaluation or inspection may measure pipeline geometry, configuration, and/or internal diameter, and may detect, locate and measure dents, ovality, buckles, wrinkles, openings, weak spots, degradation, corrosion, and/or other geometry defects of the pipeline 20.
  • Designing may include mapping and/or modelling of the installation process and/or final location/orientation of the electrical cable/conductor or conduit or infrastructure. Designing may include the design of repair or replacement of pipeline in a section where the pipeline has defects or damage, or a bend or turn which does not accommodate installation of electric cable/conductor and/or conduit.
  • the existing pipeline 20 may be cut at cuts 34, 44, 54, 64 at intervals or lengths 32, 42, 52 which may depend upon the weight of the electrical cable and/or the diameter of spools or reels 140 that can be transported.
  • the distance of the length or interval or span 32, 42, 52 may depend upon length of cable per reel, topography/geology, and/or information in the nature of environmental restrictions.
  • the interval or lengths may be defined as having a length within the range of about 2000 ft. to about 3000 ft.
  • Pits or splice pits 30, 40, 50, 60 may be dug at periodic locations in the ground 10 along the path of the pipeline 20.
  • the distance of the length or intervals or spans 32, 42, 52 of pipeline 20 between cuts 34, 44, 54, 64 may depend upon the weight of the electrical cable or the material and/or type of electrical cable and/or conduit.
  • the electrical transmission system may be a HVAC (High Voltage Alternating Current) system or a HVDC (High Voltage Direct Current) system.
  • the cuts 34, 44, 54, 64 in the pipeline 20 may occur at lengths 32, 42, 52 of about 3000 ft.
  • Aluminum electrical cable may be less likely than copper to lend itself to the implementation of thermal grout (i.e. air may fill the annulus, or if desired, thermal grout).
  • the cuts in the pipeline may occur at lengths of about 2000 ft. Copper electrical cable may lend itself more to the implementation of thermal grout as described herein and incorporated by reference.
  • the electrical cable insulation/type may be cross linked polyethylene (XLPE).
  • conduit may be plastic, such as high density polyethylene (HDPE) or polyvinylchloride (PVC), which may be FUSIBLE PVC piping/conduit of Underground Solutions, Inc. commercially available from UNDERGROUND SOLUTIONS, an AEGION company.
  • a pipeline traveler may be moved through the pipeline 20 at the location of a cut 34 across a length, interval, or span 32 to the next consecutive cut 44 or interval 42.
  • the pipeline traveler may be detached and a traveler line attached to conduit. Conduit may be pulled through the pipeline 20. Electrical cable may be pulled through/into the conduit.
  • a pipeline traveler may be a pipeline pig such as those available from Quanta Inline Devices, LLC.
  • FIG. 2 shows an exemplary embodiment of a portion of an existing underground oil and gas pipeline 20 being repurposed for electrical cable/conductor/conduit (shown, e.g., in Figs. 3 and 4).
  • Existing pipeline 20 may typically be underground or in an underground environment 12 beneath the ground surface 10.
  • a pipeline interval, length, or span 32 is pipeline pigged from cut 44 to pipeline cut 34 (See, e.g., fig 8)
  • Pig line 134 is detached from the pipeline pig 132 and attached to conduit.
  • Conduit is pulled by puller 130, which is proximate pit or splice pit 40 or cut 44, through length 32 of pipeline 20 from cut 34 to cut 44.
  • Pipeline interval, length, or span 42 is pipeline pigged from cut 44 to cut 54. Conduit is pulled by puller 130 through length 42 of pipeline 20 from cut 54 to cut 44. Cable is pulled through conduit in length 32 of pipeline 20 from cut 34 to cut 44. Cable is pulled through conduit in length 42 of pipeline 20 from cut 54 to cut 44.
  • the puller 130 may be moved proximate pit or splice pit 60 or cut 64, and the process of pigging, pulling conduit, and pulling cable may occur through length 52 and length 62 of pipeline 20. The process of pigging, pulling conduit, and pulling cable may repeat for the length of the pipeline 20. Pulling conduit through a pipeline and pulling electrical cable through/into the conduit may be performed separately and/or consecutively, or may be unitarily combined into a single step.
  • conduit and cable may be pulled in the same direction or opposite or different directions. It is preferred that conduit is pulled into a span or length of pipeline 20 first, and then cable is pulled into conduit.
  • a sensing fiber wire 74a/b (shown in Figs. 3 -6) may also be installed or pulled into the pipeline in order to sense any ‘hot spot(s)’ 75 (e.g., see Fig. 1) in the system.
  • an operator may cut out/create an opening/broach (to a create and access void for) 23 to and through the pipeline 20 to the ‘hot spot’ 75 (for example, from the ground surface 10 directly above the region where sensed) and splice as needed according to the embodiments and methodology disclosed herein at or proximate the location or region of the sensed ‘hot spot’.
  • Hot spots 75 may be remediated, relieved, or fixed via addition of a volume of thixotropic non-cementitious thermal grout 22 at or proximate the location or region of the sensed hot spot 75 via the opening/void 23. Hot spots 75 may have a greater propensity to occur in regions where the electrical cable/conductor 72a/b are spliced.
  • Consecutive lengths e.g., 32, 42, of cable may be spliced at the pits or splice pits, e.g., 42, to form a continuous electrical line or transmission line.
  • Consecutive conduits may be joined, fastened, or fused.
  • Fig. 2 shows pits or splice pits 30, 40, 50, 60, 80, 90, 100, 110, and 120.
  • Fig. 2 shows cuts 34, 44, 54, 64, 84, 94, 104, 114, and 124.
  • Fig. 2 shows lengths or intervals or spans 32, 42, 52, 62, 82, 92, 102, and 112.
  • FIG. 3 shows a sectional schematic view of an exemplary embodiment of a repurposed existing underground pipeline 20a span 32a having conduit 70a, three cables 72a, and sensing fiber optic line 74a installed for a High Voltage Alternating Current (HVAC) transmission system.
  • HVAC High Voltage Alternating Current
  • the space or annular space 76a between the pipeline 20a and the conduits 70a may be occupied by air.
  • the space or annular space 78a between the conduits 70a and the cable 72a may be occupied by air.
  • a volume of thixotropic, non- cementitious thermal grout 22 may be added to the space in the pipeline 76a and/or the space in the conduits 78a to facilitate heat or thermal dissipation (i.e.
  • the thixotropic, non- cementitious thermal grout 22 may facilitate or increase the ampacity of the high voltage electrical cable up to, by way of example, about 20%.
  • the thixotropic, non- cementitious thermal grout 22 may be added into a particular length, span, interval, segment or segment(s) 32a of pipeline 20a and/or conduit 70a, or may be added to other lengths, spans, intervals, segment or segment(s)(not shown), or may be added into the full length of continuous pipeline 20a or conduit 70a.
  • thixotropic, non-cementitious thermal grout 22 may be added into pipeline 20a and/or conduit 70a proximate the location of a detected hot spot or proximate splice locations/points.
  • FIG. 4 shows a sectional schematic view of an exemplary embodiment of a repurposed existing underground pipeline 20b span 32b having conduit 70b, two cables 72b, and sensing fiber optic line 74b installed for a High Voltage Direct Current (HVDC) transmission system.
  • the space or annular space 76b between the pipeline 20b and the conduits 70b may be occupied by air.
  • the space or annular space 78b between the conduits 70b and the cable 72b may be occupied by air.
  • a volume of thixotropic, non- cementitious thermal grout 22 may be added to the space in the pipeline 76b and/or the space in the conduits 78b to facilitate heat or thermal dissipation (i.e.
  • the thixotropic, non- cementitious thermal grout 22 may facilitate or increase the ampacity of the high voltage electrical cable up to about 20%.
  • the thixotropic, non-cementitious thermal grout 22 may be added into a particular length, span, interval, segment or segment(s) 32b of pipeline 20b and/or conduit 70b, or may be added to other lengths, spans, intervals, segment or segment(s)(not shown), or may be added into the length of continuous pipeline 20b or conduit 70b.
  • thixotropic, non-cementitious thermal grout 22 may be added into pipeline 20b and/or conduit 70b proximate the location of a detected hot spot or proximate splice locations/points to eliminate of alleviate the detected hot spot.
  • FIG. 5 shows a sectional schematic view of an exemplary embodiment of a repurposed existing underground pipeline 20a span 32a having conduit 70a, three cables 72a, and sensing fiber optic line 74a installed for a High Voltage Alternating Current (HVAC) transmission system.
  • HVAC High Voltage Alternating Current
  • the space or annular space 76a between the pipeline 20a and the conduits 70a may be occupied by air 150.
  • the space or annular space 78a between the conduits 70a and the cable 72a may be occupied by air 150.
  • the space or annular space 76a between the pipeline 20a and the conduits 70a may be occupied by air 150 and/or the space or annular space 78a between the conduits 70a and the cable 72a may be occupied by air 150.
  • FIG. 6 shows a sectional schematic view of an exemplary embodiment of a repurposed existing underground pipeline 20b span 32b having conduit 70b, two cables 72b, and sensing fiber optic line 74b installed for a High Voltage Direct Current (HVDC) transmission system.
  • the space or annular space 76b between the pipeline 20b and the conduits 70b may be occupied by air 150.
  • the space or annular space 78b between the conduits 70b and the cable 72b may be occupied by air 150.
  • the space or annular space 76a between the pipeline 20a and the conduits 70a may be occupied by air 150 and/or the space or annular space 78a between the conduits 70a and the cable 72a may be occupied by air 150.
  • Fig. 7 depicts a flowchart of an exemplary method for repurposing an existing pipeline 20 for introduction of electrical power lines 72a/b.
  • the method may have three or more of the following optional steps amongst, and not necessarily in the sequence shown: cleaning the existing pipeline 200; evaluating/inspecting the existing pipeline 20 for damage and bends 202; designing installation of the electrical power lines through the existing pipeline 204; wherein the step of evaluating/inspecting the existing pipeline for damage and bends in the existing pipeline may include calipering and mapping the existing pipeline 206; cutting the existing pipeline 208; moving a pipeline traveler 132 through the existing pipeline to the next consecutive interval 210; detaching the pipeline traveler and attaching a pipeline traveler line 134 to a conduit 212; pulling the conduit 70 through the existing pipeline and pulling an electrical cable 72 into and through the conduit 214; adding a volume of a thixotropic non-cementitious thermal grout 22 to a space defined between the existing pipeline and the conduit and/or between the conduit and the
  • pulling the conduit through the existing pipeline and pulling an electrical cable into and through the conduit may occur separately.
  • pulling an electrical cable into and through the conduit may occur consecutively after pulling the conduit through the pipeline.
  • pulling the conduit through the existing pipeline and pulling an electrical cable into and through the conduit may be performed unitarily combined into a single step.
  • FIG. 8 depicts a sectional schematic view of an exemplary embodiment of a portion of an existing underground pipeline of Fig. 2 being repurposed for electrical cable/conductor/conduit.
  • a pipeline traveler 132 is moving through length or span or interval 32 of existing pipeline 20.
  • Pipeline traveler 132 which may be a pig 132a, is connected to pipeline traveler line or pig line 134.
  • an apparatus utilizing an existing underground pipeline may comprise at least two conduits 70a, 70b installed inside the existing underground pipeline 20a, 20b, a fiber optic line 74a, 74b installed inside the existing underground pipeline 20a, 20b, and at least two electrical cables 72a, 72b respectively installed inside the two conduits 70a, 70b.
  • an electrical cable or length of electrical cable 72a, 72b may not reside or be positioned in conduit 70a, 70b.
  • an electrical cable or length of electrical cable 72a, 72b may not reside in conduit 70a, 70b at splicing and/or access junctions.
  • an apparatus utilizing an existing pipeline may further comprise a thixotropic non-cementitious thermal grout 22 filling a void 76a, 76b defined by the existing underground pipeline 20a, 20b.
  • an apparatus utilizing an existing pipeline may further comprise a means for detecting a hot spot in communication with the fiber optic line 74a, 74b.
  • an apparatus utilizing an existing pipeline 20 may further comprise a means for adding and/or withdrawing/removing thixotropic non-cementitious thermal grout 22.
  • an apparatus utilizing an existing pipeline may further comprise capped access spigots or inlets/outlets 28 along the existing pipeline 20a, 20b and/or conduit 70a, 70b through a wall 21 of the existing underground pipeline 20a/b at locations above or below ground to allow addition and/or withdrawal/removal of thixotropic non-cementitious thermal grout 22.
  • the capped access spigots 28 may be particularly beneficial as the existing pipeline will not be operated under pressure when repurposed, except or although it may contain thixotropic non-cementitious thermal grout 22.
  • Each spigot 28 may contain a flow passage, a valve, and an actuator.
  • Repurposing pipeline 20 for electrical lines/infrastructure eliminates extensive excavation and many significant costs associated with traditional trenching and burying methods of installing electrical cable underground. Further, electrical cable/conduit or electric power lines in repurposed pipeline 20 require less maintenance than overhead transmission lines because they are shielded from storm and extreme weather damage. Further, a thixotropic, non-cementitious thermal grout 22 may be added and/or removed at any time to the repurposed pipeline 20 and/or conduits 70a, 70b in repurposes pipeline, as opposed to traditional cements which set permanently and must be added at initial installation for traditional trench and bury methods.
  • thixotropic non-cementitious thermal grout 22 greatly improves operational flexibility and financial performance of the electrical system.
  • the flexibility of thixotropic non-cementitious thermal grout 22 is advantageous for addition to/insertion or removal from the existing pipeline 20 or conduit 70a, 70b; for liquefaction during access events such as splicing, repairs, or branching; and for thermal management (such as when in solid/gelled form in the undisturbed state of a thixotropic material) provides greater economic performance/benefits, as opposed to traditional cements or concrete or other inflexible materials.
  • repurposing pipeline aids in meeting demand for and facilitating transmission of renewable energy.
  • an apparatus utilizing an existing pipeline may further comprise an internal coating 24 on the existing pipeline (i.e. applied to the inside surface 26 of the existing pipeline 20).
  • an internal coating 24 for the existing pipeline may be epoxy.
  • An internal coating 24 may facilitate installation of conduit by improving or lowering the coefficient of friction.
  • An internal coating 24 may be applied to the existing pipeline 20 in whole or in part, and may be applied after the existing pipeline 20 has been cleaned, pigged, and otherwise prepared by one having ordinary skill in the art.
  • an internal coating 24 may be applied to the existing pipeline 20 prior to pulling conduit 70 a, b through or into the pipeline 20.
  • the thixotropic non-cementitious thermal grout 22 for repurposing pipeline 20, 20a, 20b for electrical cable may have a very low viscosity and flow freely while being pumped or added or removed or when energy is being applied, have no heat of hydration, gel quickly or rest in a hardened state, after pumping stops or energy is removed/no longer added, and can return to low viscosity or be “re-liquefied” or “un-gelled” later by reapplying energy to allow removing.
  • thixotropic non-cementitious thermal grout 22 Due to the non-cementitious or non-setting nature of the thixotropic non-cementitious thermal grout 22, it is possible to remove ducts/pipes/cable 72a, 72b/conduit 70a, 70b/product line, etc. in the future, e.g., for maintenance, or if there is a problem with the system. As a gel the thixotropic non-cementitious thermal grout 22 resists flowing or seeping through cracks in pipe, casing or duct. [0033] Such a thixotropic non-cementitious thermal grout 22 may have a thermal resistivity about equal to or less than 75 °C-cm/W wherein the thermal resistivity does not change or does not significantly change with time.
  • the thermal resistivity may be about 63 °C-cm/W. As another example, the thermal resistivity may be about 65 °C-cm/W.
  • a thixotropic non- cementitious thermal grout 22 has a thermal resistivity which matches or substantially matches the thermal resistivity of the native soils of a project site. For example, native soils of a project site can often vary from 65 to 75 °C-cm/W. Therefore, a formulation or mix of a thixotropic non-cementitious thermal grout 22 depends upon the thermal resistivity of the native soils of a project site.
  • a thixotropic non-cementitious thermal grout 22 may have an electrical conductivity that can provide or facilitate cathodic protection of a cable pipe inside a steel casing or existing pipeline 20, 20a, 20b.
  • a thixotropic non- cementitious thermal grout 22 may have a relatively high pH (about or approximately pH 11 or higher, preferably about pH 11-12), which is preferable in mitigating corrosion or facilitating cathodic protection of steel pipelines/conduits/ducts/product lines. In the “gelled” or solid state, the thixotropic non-cementitious thermal grout 22 may not seep through a crack in the structure where the grout is located.
  • a thixotropic non-cementitious thermal grout 22 may not dry-out, i.e. it may always remain fully saturated or substantially saturated. Further, a thixotropic non- cementitious thermal grout 22 may be used in or approved for use in environmentally sensitive areas.
  • the density of a thixotropic non-cementitious thermal grout 22 generally depends upon sand content and, by way of example only, may preferably be about 97 pounds per cubic foot — i.e. specific gravity of about 1.6. By way of example only, the density of a thixotropic non-cementitious thermal grout 22 may be about 99 pounds per cubic foot.
  • a thixotropic non-setting or non-cementitious thermal grout 22 provides improvements or advantages for cable 72a, 72b installation and ampacity.
  • there may be about an increase in ampacity e.g., a 4-10% increase in ampacity rating if a thixotropic non-cementitious thermal grout 22 is added for repurposing pipeline for electrical cable installation.
  • Even higher percentage increases to ampacity rating, for a repurposing pipeline for electrical cable installation may occur when cables 72a, 72b/conduits 70a, 70b/ducts/product lines are shorter lengths or distances.
  • a thixotropic non-cementitious thermal grout 22 for repurposing pipeline 20, 20a, and 20b for electrical cable 72a, 72b may comprise a volume of sand, a volume of water, a volume of bentonite viscosifier, a volume of at least one bentonite extender, a volume of lubricant, and a volume of soda ash.
  • a thixotropic non-cementitious thermal grout 22 for repurposing pipeline 20, 20a, 20b for electrical cable 72a, 72b may comprise a volume of frac sand at about 1629 lb. /yd 3 , a volume of water at about 982 lb./yd 3 , a volume of bentonite viscosifier at about 43.5 lb. /yd 3 , a volume of at least one bentonite extender at about 10.3 lb./yd 3 , a volume of lubricant at about 4.0 lb./yd 3 , and a volume of soda ash at about 7.6 lb./yd 3 .
  • a thixotropic non-cementitious thermal grout 22 for repurposing pipeline 20, 20a, 20b for electrical cable 72a, 72b may have a thermal resistivity of about equal to or less than 75 °C-cm/W.
  • a thixotropic non-cementitious thermal grout 22 for repurposing pipeline 20, 20a, and 20b for electrical cable 72a, 72b may have a pH of at least about 11.
  • a thixotropic non-cementitious thermal grout 22 for repurposing pipeline 20, 20a, 20b for electrical cable 72a, 72b may have a pH in the range of about 11 - 12.
  • a thixotropic non-cementitious thermal grout 22 for repurposing pipeline 20, 20a, and 20b for electrical cable 72a, 72b may further comprise a second bentonite extender.
  • the second bentonite extender may further comprise a mixed metal oxide.
  • the volume of sand may be flaked frac sand.
  • the frac sand may be #100 frac sand (e.g., but not limited to, white). Such a frac sand is commercially available from Erna Frac Sand, and US Silica.
  • the volume of bentonite viscosifier may be MAX-GEL.
  • MAX-GEL brand/trademark of M- I L.L.C., is an off-the-shelf bentonite viscosifier commercially available from M-l SWACO, a Schlumberger Company.
  • Generically MAX-GEL may be a viscosifier and namely a premium 220-bbl yield Wyoming bentonite blended with special extender. The viscosifier is capable of yielding more than twice as much viscosity as regular Wyoming bentonite.
  • the volume of at least one bentonite extender may be DRILPLEX.
  • DRILPLEX brand/trademark of M-l L.L.C., is an off-the-shelf bentonite extender commercially available from M-l SWACO, a Schlumberger Company.
  • Generically DRILPLEX may be a bentonite extender and secondary shale stabilizer designed to give improved carrying capacity and suspending ability in water-base drilling fluids, and/or a mixed metal oxide (MMO) or contains same.
  • MMO mixed metal oxide
  • the volume of lubricant is RODEASE.
  • RODEASE brand/trademark of M-l L.L.C., is an off-the-shelf lubricant commercially available from M-l SWACO, a Schlumberger Company.
  • the grout 22 may have a density within the range of about 97 to 99 pounds per cubic foot and/or a specific gravity of about 1.6.
  • the grout 22 may have an electrical resistivity of about 325 Ohm -cm.
  • the grout 22 may have a thermal resistivity matched to the thermal resistivity of a native soil at a project site ranging from 65 °C-cm/W to 75 °C-cm/W.
  • a thixotropic non-cementitious thermal grout 22 for repurposing pipeline 20, 20a, 20b for electrical cable 72a, 72b the volume of grout 22 which may be added to a space 76a, 78a, 76b, 78b removes air pockets during the adding step.
  • a thixotropic non-cementitious thermal grout 22 may have a greater than 80% fill rate or percentage, and preferably 99% or higher fill rate or percentage, or wherein greater than 80% of the desired space or void 76a, 78a, 76b, 78b to be filled contains grout (as opposed to undesirable air pockets or voids or spaces in the grout).
  • a thixotropic non-cementitious thermal grout 22 for repurposing pipeline 20 20a, 20b for electrical cable 72a, 72b
  • the volume of grout 22 which may be added to a space 76a, 78a, 76b, 78b effluxes for 15 seconds.
  • a step of adding a volume of the grout 22 further comprises removing air pockets from the grout during the adding step.

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  • Laying Of Electric Cables Or Lines Outside (AREA)

Abstract

La présente divulgation relève du domaine des infrastructures de production d'énergie électrique et concerne la réadaptation de canalisations de pétrole et de gaz existantes ou d'autres canalisations qui ne sont plus utilisées dans leur but d'origine, pour l'installation de conduits et de câbles/conduits électriques, typiquement souterrains, pour la transmission d'énergie électrique.
PCT/US2020/046456 2019-08-15 2020-08-14 Réadaptation de canalisations pour câbles électriques WO2021030726A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA3117602A CA3117602A1 (fr) 2019-08-15 2020-08-14 Readaptation de canalisations pour cables electriques

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US201962887467P 2019-08-15 2019-08-15
US62/887,467 2019-08-15
US16/682,952 US11095101B2 (en) 2016-09-06 2019-11-13 Repurposing pipeline for electrical cable
US16/682,952 2019-11-13
US16/832,526 2020-03-27
US16/832,526 US11095102B2 (en) 2016-09-06 2020-03-27 Repurposing pipeline for electrical cable

Publications (1)

Publication Number Publication Date
WO2021030726A1 true WO2021030726A1 (fr) 2021-02-18

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4427480A (en) * 1980-08-19 1984-01-24 Tokyo Gas Co. Ltd. Method and apparatus for providing the inner surface of a pipe line with a tubular lining material
US20060088384A1 (en) * 2004-10-22 2006-04-27 Putnam Samuel W Stored energy coupling and pipe bursting apparatus
US20090092173A1 (en) * 2007-09-07 2009-04-09 Ulrich Glombitza Method for monitoring the state of a tube for a coating in a system of pipes or ducts
US20090278321A1 (en) * 2007-08-13 2009-11-12 Press-Seal Gasket Corporation Internal pipe seal
CN205724799U (zh) * 2016-05-12 2016-11-23 国网天津市电力公司 一种电缆定向钻进防护钢管
US20180038093A1 (en) * 2016-08-07 2018-02-08 SeeScan, Inc. High frequency ac-powered drain cleaning and inspection apparatus & methods

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4427480A (en) * 1980-08-19 1984-01-24 Tokyo Gas Co. Ltd. Method and apparatus for providing the inner surface of a pipe line with a tubular lining material
US20060088384A1 (en) * 2004-10-22 2006-04-27 Putnam Samuel W Stored energy coupling and pipe bursting apparatus
US20090278321A1 (en) * 2007-08-13 2009-11-12 Press-Seal Gasket Corporation Internal pipe seal
US20090092173A1 (en) * 2007-09-07 2009-04-09 Ulrich Glombitza Method for monitoring the state of a tube for a coating in a system of pipes or ducts
CN205724799U (zh) * 2016-05-12 2016-11-23 国网天津市电力公司 一种电缆定向钻进防护钢管
US20180038093A1 (en) * 2016-08-07 2018-02-08 SeeScan, Inc. High frequency ac-powered drain cleaning and inspection apparatus & methods

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