CN112096303A - Heat-insulating drill rod for cooling high-temperature well shaft and preparation method thereof - Google Patents
Heat-insulating drill rod for cooling high-temperature well shaft and preparation method thereof Download PDFInfo
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- CN112096303A CN112096303A CN202011038749.7A CN202011038749A CN112096303A CN 112096303 A CN112096303 A CN 112096303A CN 202011038749 A CN202011038749 A CN 202011038749A CN 112096303 A CN112096303 A CN 112096303A
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- drill rod
- heat insulation
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- 238000001816 cooling Methods 0.000 title claims abstract description 13
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 238000009413 insulation Methods 0.000 claims abstract description 41
- 239000011248 coating agent Substances 0.000 claims abstract description 22
- 238000000576 coating method Methods 0.000 claims abstract description 22
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 9
- 239000005011 phenolic resin Substances 0.000 claims description 9
- 229920001568 phenolic resin Polymers 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- VGIPUQAQWWHEMC-UHFFFAOYSA-N [V].[Mo].[Cr] Chemical group [V].[Mo].[Cr] VGIPUQAQWWHEMC-UHFFFAOYSA-N 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000005553 drilling Methods 0.000 abstract description 23
- 238000005260 corrosion Methods 0.000 abstract description 7
- 230000007797 corrosion Effects 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 5
- 230000002265 prevention Effects 0.000 abstract description 4
- 238000010276 construction Methods 0.000 abstract description 2
- 238000001556 precipitation Methods 0.000 abstract description 2
- 239000012530 fluid Substances 0.000 description 9
- 238000002347 injection Methods 0.000 description 9
- 239000007924 injection Substances 0.000 description 9
- 238000011161 development Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 5
- 238000011049 filling Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 210000002445 nipple Anatomy 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000012720 thermal barrier coating Substances 0.000 description 1
Images
Classifications
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- 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
-
- 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
- E21B17/006—Accessories for drilling pipes, e.g. cleaners
-
- 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
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Theoretical Computer Science (AREA)
- Computer Hardware Design (AREA)
- Evolutionary Computation (AREA)
- Geometry (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Earth Drilling (AREA)
Abstract
The invention provides a heat insulation drill rod for cooling a high-temperature well shaft and a preparation method thereof. The insulating outer coating on the outer surface of the drill rod further improves the heat-insulating property of the drill rod, isolates corrosive media and pipes, ensures that the drill rod is high in wear resistance and corrosion resistance, prolongs the service life of the drill rod and reduces the drilling cost; the invention can meet the requirements of high-temperature well site construction, and has the advantages of good corrosion resistance, scale prevention, wax precipitation prevention, wear resistance and CO prevention2、H2S and other gas corrosion performances.
Description
Technical Field
The invention relates to the technical field of petroleum drilling, in particular to a heat-insulating drill rod for cooling a high-temperature well shaft and a preparation method thereof.
Background
With the continuous and deep development of oil and gas development, oil and gas drilling gradually turns to deep stratum. In contrast to the fact that the development degree of shallow oil in the world is close to saturation, the near-surface oil gas resource discovery rate is rapidly reduced, and the newly increased reserves of deep oil gas show an obvious increasing trend. In order to meet the world energy demand, the search of oil and gas to the deep stratum becomes an important guarantee for guaranteeing the sustainable development of the economic society of various countries
The ultra-high temperature brings great difficulty to the development of resources. The deeper the wellbore, the higher the temperature within the wellbore will become due to the earth temperature gradient. Current drilling technology suffers from the following fatal drawbacks at high temperatures: failure of electronic instruments and tools while drilling occurs at high temperature; (II) the service life of the drill bit is greatly reduced, and the wear rate of the drill bit is higher due to the higher temperature of the surface of the drill bit; (III) the corrosion rate increases exponentially, even leading to reduced yield strength of the drill pipe and premature failure; and (IV) the performance of the drilling fluid is changed at high temperature, and the drilling fluid cannot meet the requirements of a drilling process.
The development of high temperature wells is becoming more and more important, and the requirements for drill pipes are also gradually increasing during the production process. The drill rod belongs to an easy-to-wear industrial product, is an important component and a loss part of a drill column of a drilling well of an oil-gas field, and provides higher requirements for the performance of the drill rod under a high-temperature condition, and simultaneously accelerates the mechanical loss of the drill rod. Therefore, the research on the heat-insulating drill rod capable of being used under the high-temperature condition has important significance for improving the drilling efficiency, prolonging the service life of the drill rod and ensuring the rapid and safe operation of the drilling site.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a heat insulation drill rod for cooling a high-temperature well shaft and a preparation method thereof.A heat insulation layer is filled in an annular space in a pipe body, and aims to reduce the overall heat conductivity coefficient of the drill rod, so that drilling fluid can effectively cool a well bottom, the drill rod is prevented from losing efficacy in advance due to high-temperature abrasion, and meanwhile, the drill rod has good corrosion resistance, scale prevention, wax precipitation prevention, wear resistance and CO prevention2、H2S and the like, the assembly is simple and durable, the strength of the drill rod is hardly influenced, the service life of the drill rod is prolonged, and the drilling cost is reduced.
In order to realize the purpose, the technical scheme adopted by the invention is as follows:
an insulated drill pipe for cooling a high temperature well bore, comprising: the drill pipe comprises a heat insulation layer 4, a drill pipe body 5, a heat insulation coating 6, an external thread joint 12 and an internal thread joint 13.
The external thread joint 12 and the internal thread joint 13 are connected with the drill pipe body 5 in a friction compression joint mode,
the drill pipe body 5 is hollow and cylindrical, a ring-shaped heat insulation layer 4 concentric with the drill pipe body 5 is arranged inside the pipe wall of the drill pipe body 5, and a heat insulation coating 6 is arranged on the outer wall of the drill pipe body 5. The outer diameter of the drill pipe body is 202-206 mm, the inner diameter of the drill pipe body is 145-148 mm, the outer diameter of the heat insulation layer is 172-176 mm, the inner diameter of the heat insulation layer is 152-156 mm, and the outer diameters of the external thread joint and the internal thread joint are 229-233 mm.
Further, the inner diameters of the female adapter and the male adapter are the same as the inner diameter of the drill pipe body.
Further, the outer coating coated on the outer surface of the drill pipe body is a polyfluorine high-temperature-resistant coating, and the thickness of the outer coating is more than or equal to 60 microns.
Further, the heat insulation layer is made of phenolic resin.
Further, the heat insulation drill pipe body for cooling the high-temperature well shaft is a chromium-molybdenum-vanadium steel component.
Further, the length of the heat insulation drill pipe body is 9400-9700 mm.
Further, the length of the threaded joint is 355.6-381 mm; the length of the male threaded joint is 279.4-304.8 mm.
Preferably, the female connector has a length of 381mm and the male connector has a length of 304.8 mm.
The invention also discloses a preparation method of the heat insulation drill rod, which comprises the following steps:
(1) the internal thread joint and the external thread joint are fixed with the drill pipe body through friction welding, an annular space is reserved in the drill pipe, an injection hole channel is reserved on the drill pipe and communicated with an annular space, and a conical internal thread section is arranged in the injection hole channel;
(2) sintering the closed-cell particles and phenolic resin at high temperature, and immediately injecting the sintered closed-cell particles and the phenolic resin into the annular space inside the drill rod from the injection pore channel to form a heat-insulating layer after curing;
(3) after the heat-insulating layer is solidified, the filling plug is screwed into the filling hole and fixed by the thread lock, so that the heat-insulating layer is sealed between the drill rods, and the failure of contact oxidation with air is avoided.
(4) The polyfluorinated high-temperature resistant coating is matched with a high-lubricating additive, is sprayed on the outer surface of the drill rod through high-temperature sintering, and is dried to form a compact high-temperature resistant heat-insulating coating with a certain thickness.
Compared with the prior art, the invention has the advantages that:
(1) the heat-insulation drill rod can effectively reduce the overall heat conductivity coefficient of the drill rod, obviously reduce the temperature of the bottom hole environment, meet the use requirements of a measurement instrument while drilling and ensure the performance of drilling fluid; (2) the failure of the drill rod due to high-temperature abrasion can be avoided in advance, the field working stability is improved, and the fatigue life of the drill rod is prolonged; (3) the outer coating on the drill rod further improves the heat insulation performance of the drill rod and enables the drill rod to be high in wear resistance and corrosion resistance.
Drawings
FIG. 1 is a schematic structural view of an insulated drill pipe according to an embodiment of the present invention;
FIG. 2 is a top view of the structure of an insulated drill pipe according to an embodiment of the present invention;
FIG. 3 is a well bore structure diagram of a well in petrochemistry used in numerical simulation;
FIG. 4 is a schematic diagram of the variation of drilling fluid temperature with well depth in insulated drill pipes of different lengths;
FIG. 5 is a schematic diagram showing the variation of drilling fluid temperature with well depth in the annulus between the insulated drill pipe of different lengths and the well wall;
FIG. 6 is a graph of bottom hole temperature as a function of length of insulated drill pipe.
In the figure: 1. an externally threaded joint torque shoulder surface; 2. a male adapter threaded region; 3. the external thread joint seals the shoulder surface; 4. a heat insulation layer; 5. a drill pipe body; 6. a thermal barrier coating; 7. an interior thread joint torque shoulder surface; 8. an internal nipple threaded region; 9. the sealing shoulder surface of the female adapter; 10. a thread lock; 11. an injection channel; 12. an externally threaded nipple; 13. an internal thread joint; 14 heat insulating layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings by way of examples.
As shown in FIG. 1, the invention discloses an insulated drill rod for cooling a high-temperature well shaft, which comprises: the drill pipe comprises an external thread joint torque shoulder surface 1, an external thread joint threaded area 2, an external thread joint sealing shoulder surface 3, a heat insulation layer 4, a drill pipe body 5, a heat insulation coating 6 and an internal thread joint torque shoulder surface 7; a box thread region 8, a box seal shoulder 9, a thread lock 10, an injection passage 11, a pin 12, and a box 13.
The external thread joint 12 and the internal thread joint 13 are connected with the drill pipe body 5 in a friction compression joint mode,
the male adapter 12 comprises a male adapter torque shoulder surface 1, a male adapter threaded region 2 and a male adapter sealing shoulder surface 3;
the female connection 13 includes a female connection torque shoulder surface 7, a female connection threaded region 8, and a female connection seal shoulder surface 9. The female adapter 13 and the male adapter 12 are designed by adopting the conventional inner and outer threaded adapters of the drill rod.
The drill rod pipe body 5 is hollow and cylindrical, a ring-shaped heat insulation layer concentric with the drill rod pipe body 5 is arranged inside the pipe wall of the drill rod pipe body 5, and a heat insulation coating 6 is arranged on the outer wall of the drill rod pipe body 5.
An injection hole 11 is reserved on the side wall of the external thread joint 12, the outer diameter of the drill pipe body 5 is 202-206 mm, the inner diameter of the drill pipe body is 145-148 mm, the outer diameter of the heat insulation layer 17 is 172-176 mm, the inner diameter of the heat insulation layer is 152-156 mm, and the outer diameters of the external thread joint 12 and the internal thread joint 13 are 229-233 mm.
The inner diameters of the internal thread joint 13 and the external thread joint 12 are the same as the inner diameter of the drill pipe body 5, so that the equal-diameter design of the inside of the whole drill pipe body is realized, the stress concentration phenomenon is avoided, and the service life of the drill pipe is prolonged;
the outer coating coated on the outer surface of the drill pipe body is a polyfluorinated high-temperature-resistant coating, and the thickness of the outer coating is more than or equal to 60 mu m.
The heat preservation and insulation layer is made of phenolic resin, so that the overall heat conductivity coefficient of the drill rod can be effectively reduced, and the drill rod is prevented from losing efficacy in advance due to high-temperature abrasion. After the heat preservation and insulation layer is added, the integral heat conductivity coefficient of the drill rod is reduced to 0.050W/m.k-0.120W/m.k, and the drill rod can achieve good heat preservation and insulation effects.
The heat insulation drill pipe body for cooling the high-temperature well shaft is a chromium-molybdenum-vanadium steel component, so that the bending moment bearing capacity and fatigue crack resistance capacity of the drill pipe in construction are improved, and the strength reduction of the drill pipe due to the addition of a heat insulation layer is avoided.
The length of the drill pipe body 3 is 9400-9700 mm.
The length of the female adapter 13 is 381mm, and the length of the male adapter 12 is 304.8 mm.
The preparation method of the heat insulation drill rod comprises the following steps:
(1) the internal thread joint and the external thread joint are fixedly connected with a drill rod pipe body through friction welding, an annular space is reserved in the drill rod, an injection hole is reserved in the drill rod and communicated with an annular space, and a conical internal thread section is arranged in the injection hole;
(2) sintering the closed-cell particles and phenolic resin at high temperature, and immediately injecting the sintered closed-cell particles and the phenolic resin into the annular space inside the drill rod from the injection pore channel to form a heat-insulating layer after curing;
(3) after the heat-insulating layer is solidified, the filling plug is screwed into the filling hole and fixed by the thread lock, so that the heat-insulating layer is sealed between the drill rods, and the failure of contact oxidation with air is avoided.
(4) And spraying the polyfluoro high-temperature-resistant coating on the surface of the drill rod, and drying to form an outer coating.
Fig. 2 is a structural plan view of the heat-insulating drill rod for cooling the high-temperature well bore according to the embodiment of the invention, and the distribution of the internal structure of the drill rod can be seen.
In order to illustrate the benefits of the invention, a downhole temperature model under a circulation condition is developed based on a mathematical model and a numerical simulation method, so that the influence of the heat insulation drill rod on the temperature distribution of the well barrel in the drilling process is researched.
FIG. 3 is a diagram of a well bore configuration for a well being petrochemically used in a numerical simulation, the drilling tool assemblies used in the simulation being shown in Table 1.
TABLE 1 drilling tool combination design
FIG. 4 is a schematic diagram showing the variation of the temperature of the drilling fluid in the heat-insulating drill rods with different lengths along with the well depth, and FIG. 5 is a schematic diagram showing the variation of the temperature of the drilling fluid in the annulus between the heat-insulating drill rods with different lengths and the well wall along with the well depth, from the two figures, it can be known that the bottom temperature can be reduced by 11 ℃ when the heat-insulating drill rods are 500 meters in length compared with the case that the heat-insulating drill rods are not adopted; when the length of the heat insulation drill rod is 1000 meters, the bottom temperature can be reduced by 21 ℃; when the length of the heat insulation drill rod reaches 2000 m, the bottom temperature can be reduced by more than 70 ℃. The heat insulation drill rod provided by the invention can effectively reduce the bottom hole temperature.
FIG. 6 is a graph showing the variation of bottom hole temperature with the length of the insulated drill pipe, and it can be seen that the longer the insulated drill pipe in a certain range, the more the bottom hole temperature is reduced, further verifying the advantage of the present invention under high temperature conditions.
The principle of the invention is as follows: a heat insulation drill rod for cooling a high-temperature well shaft mainly takes phenolic resin as a raw material, closed-cell particles and the phenolic resin are injected into the inner annular space of the drill rod after being sintered at a high temperature, and are fully combined with the drill rod after being cooled and formed, a compact heat insulation layer with a certain thickness is formed on the inner wall of the drill rod, the integral heat conductivity coefficient of the drill rod is reduced, and the drilling fluid can effectively cool the well bottom. The insulating outer coating on the outer surface of the drill rod further improves the heat-insulating property of the drill rod, isolates corrosive media and pipes, ensures that the drill rod is high in wear resistance and corrosion resistance, prolongs the service life of the drill rod and reduces the oil extraction cost.
It will be appreciated by those of ordinary skill in the art that the examples described herein are intended to assist the reader in understanding the manner in which the invention is practiced, and it is to be understood that the scope of the invention is not limited to such specifically recited statements and examples. Those skilled in the art can make various other specific changes and combinations based on the teachings of the present invention without departing from the spirit of the invention, and these changes and combinations are within the scope of the invention.
Claims (8)
1. An insulated drill pipe for cooling a high temperature well bore, comprising: the drill pipe comprises a heat insulation layer, a drill pipe body, a heat insulation coating, an external thread joint and an internal thread joint;
the external thread joint and the internal thread joint are connected with the drill pipe body in a friction compression joint mode;
the drill pipe body is hollow and cylindrical, a circular heat-insulating layer concentric with the drill pipe body is arranged inside the pipe wall of the drill pipe body, and a heat-insulating coating is arranged on the outer wall of the drill pipe body; the outer diameter of the drill pipe body is 202-206 mm, the inner diameter of the drill pipe body is 145-148 mm, the outer diameter of the heat insulation layer is 172-176 mm, the inner diameter of the heat insulation layer is 152-156 mm, and the outer diameters of the external thread joint and the internal thread joint are 229-233 mm.
2. The insulated drill pipe for reducing the temperature of the high-temperature well shaft according to claim 1, wherein: the inner diameters of the internal thread joint and the external thread joint are the same as the inner diameter of the drill pipe body.
3. The insulated drill pipe for reducing the temperature of the high-temperature well shaft according to claim 1, wherein: the outer coating coated on the outer surface of the drill pipe body is a polyfluorinated high-temperature-resistant coating, and the thickness of the outer coating is more than or equal to 60 mu m.
4. The insulated drill pipe for reducing the temperature of the high-temperature well shaft according to claim 1, wherein: the heat insulation layer is made of phenolic resin.
5. The insulated drill pipe for reducing the temperature of the high-temperature well shaft according to claim 1, wherein: the heat insulation drill pipe body for cooling the high-temperature well shaft is a chromium-molybdenum-vanadium steel component.
6. The insulated drill pipe for reducing the temperature of the high-temperature well shaft according to claim 1, wherein: the length of the heat insulation drill rod pipe body is 9400-9700 mm.
7. The insulated drill pipe for reducing the temperature of the high-temperature well shaft according to claim 1, wherein: the length of the threaded joint is 355.6-381 mm; the length of the male threaded joint is 279.4-304.8 mm.
8. The insulated drill pipe for reducing the temperature of the high-temperature well shaft according to claim 1, wherein: the female connector length is 381mm, and the male connector length is 304.8 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011038749.7A CN112096303A (en) | 2020-09-28 | 2020-09-28 | Heat-insulating drill rod for cooling high-temperature well shaft and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011038749.7A CN112096303A (en) | 2020-09-28 | 2020-09-28 | Heat-insulating drill rod for cooling high-temperature well shaft and preparation method thereof |
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| CN112096303A true CN112096303A (en) | 2020-12-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011038749.7A Pending CN112096303A (en) | 2020-09-28 | 2020-09-28 | Heat-insulating drill rod for cooling high-temperature well shaft and preparation method thereof |
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| US20030178201A1 (en) * | 2002-03-20 | 2003-09-25 | Polyflow, Inc. | Method for inserting a pipe liner |
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2020
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Application publication date: 20201218 |