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WO2021016351A1 - Coulis thermique thixotrope non à base de ciment et procédés d'application en fdh ou en ligne de produit en dépression - Google Patents

Coulis thermique thixotrope non à base de ciment et procédés d'application en fdh ou en ligne de produit en dépression Download PDF

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Publication number
WO2021016351A1
WO2021016351A1 PCT/US2020/043069 US2020043069W WO2021016351A1 WO 2021016351 A1 WO2021016351 A1 WO 2021016351A1 US 2020043069 W US2020043069 W US 2020043069W WO 2021016351 A1 WO2021016351 A1 WO 2021016351A1
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WO
WIPO (PCT)
Prior art keywords
volume
thixotropic non
cementitious thermal
thermal grout
grout
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/US2020/043069
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English (en)
Inventor
Ronald G. Halderman
Pablo Esteban GUERRA
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Quanta Associates LP
Original Assignee
Quanta Associates LP
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Filing date
Publication date
Application filed by Quanta Associates LP filed Critical Quanta Associates LP
Priority to CA3117537A priority Critical patent/CA3117537C/fr
Publication of WO2021016351A1 publication Critical patent/WO2021016351A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
    • C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
    • C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B30/00—Compositions for artificial stone, not containing binders
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00034—Physico-chemical characteristics of the mixtures
    • C04B2111/0012—Thixotropic mixtures
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00034—Physico-chemical characteristics of the mixtures
    • C04B2111/00146—Sprayable or pumpable mixtures
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00663—Uses not provided for elsewhere in C04B2111/00 as filling material for cavities or the like
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00663—Uses not provided for elsewhere in C04B2111/00 as filling material for cavities or the like
    • C04B2111/00706—Uses not provided for elsewhere in C04B2111/00 as filling material for cavities or the like around pipelines or the like
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values

Definitions

  • TITLE Thixotropic Non-cementitious Thermal Grout and HDD or Trough Product Line Methods of Application
  • the disclosure relates to the field of horizontal directional drilling, trenchless technology, trenches, and grouts for installation of pipe, conduits, ducts, utility lines, and other product lines underground or under obstacles, such as a body of water or roadways.
  • the standard or traditional cementitious grouts e.g. those comprising Portland cement
  • do not flow well have high or higher temperatures due to heat of hydration which may deform, e.g., a duct or other apparatus, and become solid after (and maybe even during) their installation.
  • these traditional cementitious grouts irreversibly“set” after a period of time, and may put impractical or impossible time constraints on installation projects.
  • the voids and air pockets of the traditional cementitious grouts are undesirable and detrimental to cables.
  • the present disclosure generally relates to embodiments of a thixotropic, non-cementitious, thermal grout and applications or methods of use of the grout related to horizontal directional drilling, trenchless technology, trenching, and installation of pipe, conduits, ducts, utility lines, and other product lines which may, e.g., be in trenches, underground, or under obstacles, such as a body of water or roadways.
  • the present disclosure relates to embodiments of a thixotropic non- cementitious thermal grout for horizontal directional drilling (“HDD”) applications for use with cables/conduits/ducts/product lines.
  • HDD horizontal directional drilling
  • the present disclosure relates to embodiments of a thixotropic non-cementitious thermal grout for trenching applications for use with cables/conduits/ducts/product lines.
  • the present disclosure relates to embodiments of methods of installing cables/conduits/ducts/product lines related to horizontal directional drilling, trenchless technology, and trenching.
  • Horizontal directional drilling (also referred to as “HDD”) is a sophisticated, trenchless technique/method used to install utilities, such as natural gas pipe lines, electric and many other infrastructural needs, including by way of example only pipe, conduit, or cable, under ground level and often under obstacles.
  • utilities such as natural gas pipe lines, electric and many other infrastructural needs, including by way of example only pipe, conduit, or cable, under ground level and often under obstacles.
  • product line(s) shall refer to a conduit(s), pipe(s), tubular(s), duct(s), casing(s), cable(s) and/or the like. As used herein those terms do not refer to oil and gas drilling and production. As used herein the term “frac” shall also refer to fracking or hydraulic fracturing.
  • Fig. 1 depicts a sectional schematic view of an exemplary embodiment of a metal casing and metal line pipes containing cable during an installation or pull-back (or removal for maintenance) at or near a midpoint position with a thixotropic non- cementitious thermal grout filling a space or void.
  • Fig. 2 shows a schematic, sectional view of an exemplary embodiment of a thixotropic non-cementitious thermal grout occupying a space or void between a steel casing and steel line pipes/steel cable pipes containing cable.
  • Fig. 3 depicts a sectional schematic view of an exemplary embodiment of a trough containing cable during an install (or removal for maintenance) at or near a midpoint position with a thixotropic non-cementitious thermal grout filling a space or void.
  • Fig. 4 shows a schematic, sectional view of an exemplary embodiment of a thixotropic non-cementitious thermal grout occupying a space or voice between cables/conduits/product lines and walls of a trench.
  • a thixotropic non-cementitious thermal grout for HDD application for use with cables/conduits/ducts/product lines or a thixotropic non-cementitious thermal grout for trenching applications for use with cables/conduits/ducts/product lines may have a very low viscosity and flow freely while being pumped 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, e.g., a duct in a casing, and/or a cable in a duct.
  • the thixotropic non-cementitious thermal grout Due to the non- cementitious or non-setting nature of the thixotropic non-cementitious thermal grout, it is possible to remove ducts/pipes, 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 resists flowing or seeping through cracks in pipe, casing or duct.
  • Such a thixotropic non-cementitious thermal grout 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.
  • the thermal resistivity may be about 65 °C-cm/W.
  • a thixotropic non-cementitious thermal grout has a thermal resistivity which matches or substantially matches the thermal resistivity of the native soils of a project site.
  • 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 depends upon the thermal resistivity of the native soils of a project site.
  • a thixotropic non-cementitious thermal grout may have an electrical conductivity that can provide or facilitate cathodic protection of a cable pipe inside a steel casing.
  • a thixotropic non-cementitious thermal grout 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.
  • the thixotropic non-cementitious thermal grout may not seep through a crack in the structure where the grout is located.
  • a thixotropic non-cementitious thermal grout may not dry-out, i.e.
  • a thixotropic non-cementitious thermal grout may be used in or approved for use in environmentally sensitive areas.
  • the density of a thixotropic non-cementitious thermal grout 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 may be about 99 pounds per cubic foot.
  • a thixotropic non-setting or non-cementitious thermal grout provides improvements or advantages for cable installation and ampacity.
  • Even higher percentage increases to ampacity rating, whether, e.g., a trenched installation or a HDD installation may occur when cables/conduits/ducts/product lines are shorter lengths or distances.
  • a high-density thixotropic non-cementitious thermal grout may prevent long-term duct deformation due to external hydrostatic pressure in a deep HDD. Additionally, the grout may be injected into existing ducts— either transmission or distribution— to obtain rating increases or increment in lifetime expectancy of electric systems.
  • a thixotropic non-cementitious thermal grout may aid the installation of ducts in a casing.
  • a thixotropic non-cementitious thermal grout may also have applications in transmission and distribution cable systems. For example, in an HDD with a casing, filling the volume or annular space or void between ducts or pipe and the casing will improve heat transfer, increasing cable rating. As an additional example, filling cable ducts with the grout before cable installation provides buoyancy and permits longer pulls.
  • Figures 1 -2 show a sectional schematic view of an exemplary embodiment of an HDD rig or apparatus 11 on surface 17 pulling pipe 13 connected to a metal casing 12 and metal line pipes 14 containing cable 16 during an installation or pull-back (or removal for maintenance) under an obstacle 19 utilizing a thixotropic non-cementitious thermal grout 10 filling a space or void 24 defined by drilled or reamed walls 26.
  • the exemplary embodiment of Fig. 1 also shows frac tank 18, vacuum pump(s) 20, and ball valve(s) 22 which may be utilized as a part of the installation or pull-back process.
  • Figure 2 shows a schematic, sectional view of an exemplary embodiment (not drawn to scale) of a volume of thixotropic non-cementitious thermal grout 10 occupying or filling the annular space or void between the inner surface 12a of metal, e.g. steel, casing 12 and the outer surface 14b of metal, e.g., steel, line pipes/steel cable pipes 14, the steel line pipes/steel cable pipes 14 containing cable 16.
  • Grout 10 may additionally and/or optionally occupy the annular space or void between the inner surface 14a of steel line pipe or duct 14 and cable 16.
  • the volume of thixotropic non-cementitious thermal grout 10 is indicated by symbols/hatching.
  • Figure 3 shows a sectional schematic view of an exemplary embodiment of a trough 112 containing conduit 114 containing cable during an install (or removal for maintenance) with a thixotropic non-cementitious thermal grout 110 filling a space or void.
  • FIG 4 shows a schematic, sectional view of an exemplary embodiment (not drawn to scale) of a volume of thixotropic non-cementitious thermal grout 110 occupying or filling a space or void between cables/conduits/ducts/product lines 114 and the walls 112a, 112b, 112c of a trench 112.
  • Grout may additionally and/or optionally occupy the annular space or void between conduit 114 and cable 116.
  • the thixotropic non-cementitious thermal grout 110 is not filling the entire trench 112.
  • the volume of thixotropic non-cementitious thermal grout 110 is indicated by symbols/hatching.
  • Empty conduits 15, 115 are represented in Figures 2 and 4.
  • the empty conduits 15, 115 could commonly be used for fiber optics installation (fiber optics used for data transmission).
  • the empty conduits 15, 115 could have another use as spare conduit(s) in case of the failure of the primary conduit(s). If used to replace a primary conduit due to a system failure conduit(s) 15 and/or 115 can be filled with thixotropic non-cementitious thermal grout 10 and/or 110 at the moment or time of installing a cable there-through.
  • a thixotropic non-cementitious thermal grout for FIDD applications for use with cables/conduits/ducts/product lines 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 10 for HDD applications for use with cables/conduits/ducts/product lines 12, 14, 16 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 for HDD applications for use with cables/conduits/ducts/product lines may have a thermal resistivity of about equal to or less than 75 °C-cm/W.
  • a thixotropic non-cementitious thermal grout for HDD applications for use with cables/conduits/ducts/product lines may have a pH of at least about 11.
  • a thixotropic non-cementitious thermal grout for HDD applications for use with cables/conduits/ducts/product lines may have a pH in the range of about 11 - 12.
  • a thixotropic non-cementitious thermal grout for HDD applications for use with cables/conduits/ducts/product lines may further comprise a second bentonite extender.
  • the second bentonite extender may further comprise a mixed metal oxide.
  • the volume of sand may be a 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-l 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.
  • a thixotropic non-cementitious thermal grout 110 for trenching applications, as in Fig. 4, for use with cables/conduits/ducts/product lines 114, 116 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.
  • Generically RODEASE may be a lubricant.
  • a thixotropic non-cementitious thermal grout for trenching applications for use with cables/conduits/ducts/product lines 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 for trenching applications for use with cables/conduits/ducts/product lines may have a thermal resistivity of about 63 °C-cm/W.
  • a thixotropic non-cementitious thermal grout for trenching applications for use with cables/conduits/ducts/product lines may have a pH of at least about 11.
  • a thixotropic non-cementitious thermal grout for trenching applications for use with cables/conduits/ducts/product lines may have a pH in the range of about 11 - 12.
  • a thixotropic non-cementitious thermal grout for trenching applications for use with cables/conduits/ducts/product lines may further comprise a second bentonite extender.
  • the second bentonite extender may further comprise a mixed metal oxide.
  • the volume of sand may be a flaked frac sand.
  • the frac sand may be #100 frac sand (e.g., but not limited to, white).
  • the volume of bentonite viscosifier may be MAX-GEL.
  • MAX-GEL brand/trademark of M-l L.L.C., is an off-the-shelf bentonite viscosifier commercially available from M-l SWACO, a Schlumberger Company.
  • 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.
  • 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.
  • one exemplary embodiment of a method of installing cables/conduits/ducts/product lines comprises the steps of filling a void or space with a thixotropic non-cementitious thermal grout, and pulling a product line through the grout.
  • the steps of filling and pulling may occur in any sequence, order, and/or at the same time/simultaneously (in other words the thixotropic non-cementitious thermal grouting may occur in new installations after drilling before product line is moved in, or by filling as one goes along with the product line; or product line can be moved in/out of existing installations, e.g.
  • the grout 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 to be filled contains grout (as opposed to undesirable air pockets or voids or spaces in the grout).
  • a void or space to be filled may be, by way of example only, an annular space or void, or a trench or a portion of a trench, or the space or void of a conduit, duct, casing, or product line. By way of example only, it is preferred, for example, that there is minimal air trap or minimal large pockets of air localized within, e.g.
  • a method of installing cables/conduits/ducts/product lines utilizes a thixotropic non-cementitious thermal grout comprising 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 method of installing cables/conduits/ducts/product lines utilizes a thixotropic non-cementitious thermal grout comprising 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 method of installing cables/conduits/ducts/product lines may comprise the steps of agitating the thixotropic non-cementitious thermal grout to un-gel or unsolidify the thixotropic non- cementitious thermal grout and pulling the cable/conduit/duct/product line out through the grout.
  • a method of installing cables/conduits/ducts/product lines may comprise the steps of surrounding the cable/conduit/duct/product line with the grout and inhibiting corrosion of metal, the grout having a pH in the range of about 11 -12.
  • the bentonite extender or DRILPLEX may be useful for same.
  • a method of installing cables/conduits/ducts/product lines may comprise the step of surrounding the product line with the grout, the grout having a thermal resistivity of about equal to or less than 75 °C-cm/W.
  • a method of installing cables/conduits/ducts/product lines may comprise the step of surrounding the product line with grout, the grout having an improved electrical conductivity or electrical resistivity of about 325 Ohm-cm.
  • a method of installing cable/conduits/ducts/product lines may further comprise the step of the grout effluxing for fifteen seconds.
  • a method of installing cables/conduits/ducts/product lines may further comprise the step of removing air pockets from the grout during the filling or surrounding step.
  • the thixotropic non-cementitious thermal grout 10/110 could be pumped into the bottom or low point of void(s), holes or troughs to be filled, pushing the air out (i.e. toward high points). Vacuum pumps and stand pipes may be useful for same.
  • a ball valve or valves 22 may be connected to a conduit 14 or casing 12 to be filled with the thixotropic non- cementitious thermal grout 10.
  • a frac tank 18 may be connected proximate the entrance and/or exit to supply the thixotropic non-cementitious thermal grout 10.
  • Vacuum pump(s) 20 are also connected to the conduit 14 or casing 12 to be filled. Vacuum pump(s) 20 are turned on to pull, by way of example only, a vacuum pressure of -10 psi atmospheric pressure.
  • Specific ball valve(s) 22 may then be opened to allow the thixotropic non- cementitious thermal grout 10 to flow gravitationally (the grout 10 flows freely) into the conduit 14 or casing 12 utilizing the volume stored in the frac tank 18 until the conduit 14 or casing 12 is filled completely or as desired. Some of the vacuum pressure may be lost during this step or as the conduit 14 or casing 12 is filled. If needed the vacuum pump(s) 20 may be reactivated to pump remaining thixotropic non-cementitious thermal grout 10 as needed into the conduit 14 or casing 12 until filled.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Structural Engineering (AREA)
  • Laying Of Electric Cables Or Lines Outside (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

L'invention concerne des modes de réalisation d'un coulis thermique thixotrope, non à base de ciment et des applications ou des procédés d'utilisation du coulis liés au forage directionnel horizontal (FDH), à la technologie sans tranchée, au creusement de tranchées et à l'installation de tuyaux, de conduites, de canalisations, de lignes de service public et d'autres lignes de produit qui peuvent, par exemple, être dans des tranchées, souterrains ou sous des obstacles, tels qu'une masse d'eau ou des routes.
PCT/US2020/043069 2019-07-22 2020-07-22 Coulis thermique thixotrope non à base de ciment et procédés d'application en fdh ou en ligne de produit en dépression Ceased WO2021016351A1 (fr)

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US20120247766A1 (en) * 2011-04-01 2012-10-04 Hemmings Raymond T Geothermal grout, methods of making geothermal grout, and methods of use
US20150197033A1 (en) * 2012-03-09 2015-07-16 Halliburton Energy Services, Inc. Set-Delayed Cement Compositions Comprising Pumice and Associated Methods
US20160002521A1 (en) * 2014-07-03 2016-01-07 Solazyme, Inc. Lubricants and wellbore fluids
US20190211628A1 (en) * 2016-09-06 2019-07-11 Quanta Associates, L.P. Pulling product lines underground under obstacles including water bodies

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5241993A (en) * 1989-12-06 1993-09-07 Stephens Patrick J Method for grouting cavities using a pumpable cement grout
US20120247766A1 (en) * 2011-04-01 2012-10-04 Hemmings Raymond T Geothermal grout, methods of making geothermal grout, and methods of use
US20150197033A1 (en) * 2012-03-09 2015-07-16 Halliburton Energy Services, Inc. Set-Delayed Cement Compositions Comprising Pumice and Associated Methods
US20160002521A1 (en) * 2014-07-03 2016-01-07 Solazyme, Inc. Lubricants and wellbore fluids
US20190211628A1 (en) * 2016-09-06 2019-07-11 Quanta Associates, L.P. Pulling product lines underground under obstacles including water bodies

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