CN111594060A - Non-vacuum heat insulation oil pipe and production process thereof - Google Patents
Non-vacuum heat insulation oil pipe and production process thereof Download PDFInfo
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- CN111594060A CN111594060A CN202010668358.7A CN202010668358A CN111594060A CN 111594060 A CN111594060 A CN 111594060A CN 202010668358 A CN202010668358 A CN 202010668358A CN 111594060 A CN111594060 A CN 111594060A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
Abstract
The invention discloses a non-vacuum heat-insulating oil pipe which comprises an outer pipe, an inner pipe, heat-insulating filler and a pipe coupling, wherein the inner pipe is fixedly connected inside the outer pipe, a sealed annular cavity is arranged between the inner pipe and the outer pipe, the heat-insulating filler is filled in the annular cavity, external threads are respectively arranged at two ends of the outer part of the outer pipe, the pipe coupling is connected on the external thread at one end of the outer pipe, the pipe coupling comprises a coupling inner pipe, a coupling outer pipe and the coupling heat-insulating filler, internal threads are arranged on the inner side of the coupling inner pipe and are matched with each other, the coupling outer pipe is fixedly connected on the outer side of the coupling inner pipe, the sealed annular cavity is arranged between the coupling outer pipe and the coupling inner pipe, and the coupling heat-insulating filler is. The invention also discloses a production process of the non-vacuum heat-insulation oil pipe. The invention has scientific and reasonable structure and good use effect, and is suitable for popularization and use.
Description
Technical Field
The invention relates to the field of oil exploitation, in particular to a non-vacuum heat-insulating oil pipe and a production process thereof.
Background
With the continuous development of the oil exploitation industry and the continuous increase of the oil consumption, the exploitation of thick oil becomes a main yield source of many oil companies at home and abroad, and the annual yield of the thick oil in China reaches more than 1500 ten thousand tons. The heavy oil recovery usually has two recovery modes of steam huff and puff and steam flooding, wherein the steam huff and puff refers to a heavy oil recovery method for completing three processes of steam injection, well stewing and well opening production in the well. Steam flooding is the continuous injection of steam from a gas injection well through a suitable well pattern to form a steam zone around the injection well, and the injected steam heats and drives the underground crude oil to surrounding production wells for production. Before ninety years, steam huff and puff wells are mainly used for thick oil recovery in China, however, the thick oil recovery in China by adopting a steam huff and puff recovery technology generally enters high rounds, and the recovery rate of the thick oil field after entering a high-round recovery stage can be effectively improved by adopting a thick oil steam drive well recovery mode, so that the method has a remarkable effect on improving the thick oil yield. But with the change of the heavy oil recovery mode from a steam huff-and-puff well to a steam drive well, higher requirements are put on the oil pipe.
When the thick oil is exploited by injecting steam, an oil pipe with heat insulation and preservation functions is needed to reduce heat loss, improve steam dryness and protect an oil well casing and a cementing cement sheath from being damaged by thermal stress. The vacuum heat-insulating oil pipe used in the present oil production operation is a double-layer concentric pipe column, and the annular space of two layers of pipes is filled with heat-insulating material, evacuated and added with getter.
The disadvantages of this insulated tubing:
1, the existence of hydrogen permeation phenomenon can destroy the vacuum environment in the vacuum cavity, so that the heat insulation effect of the oil pipe is deteriorated until failure. The hydrogen seepage phenomenon is that hydrogen molecules have extremely small volume, high activity and strong permeability, can penetrate through a metal plate without defects under sufficient pressure and enter a vacuum heat insulation pipe to destroy the vacuum environment, and becomes a main reason of failure of the vacuum heat insulation oil pipe, the theoretical life of the vacuum heat insulation oil pipe is 7 years, the heat insulation failure can be realized within one year actually, for heavy oil production, particularly offshore heavy oil production, the maintenance cost is extremely high, the vacuum heat insulation environment is replaced, and the service life of the heat insulation pipe is prolonged.
2, because the threaded connection part of the pipe head thread and the coupling is not provided with a heat insulation layer and has a heat conduction channel, heat leakage exists at the connection part of the oil pipe.
And 3, the coupling is of a single-layer structure, and no heat insulation layer exists, so that a heat conduction path exists at the coupling, and internal heat loss is caused.
4, the threads are American petroleum standard API buttress threads, complete sealing on steam is not achieved, and steam leakage exists.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a non-vacuum heat-insulating oil pipe and a production process thereof, which solve the defects of the existing vacuum heat-insulating oil pipe in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme: the utility model provides a non-vacuum heat insulation oil pipe, includes outer tube, inner tube, thermal-insulated filler and pipe coupling, the inside fixedly connected with inner tube of outer tube, be equipped with sealed annular cavity between inner tube and the outer tube, it has thermal-insulated filler to fill up in the annular cavity, the outside both ends of outer tube are equipped with the external screw thread respectively, be connected with the pipe coupling on the external screw thread of outer tube one end, the pipe coupling includes coupling inner tube, coupling outer tube and coupling thermal-insulated filler, coupling inner tube inboard is equipped with the internal thread, internal thread and external screw thread are matchd each other, coupling inner tube outside fixedly connected with coupling outer tube, be equipped with sealed annular cavity between coupling outer tube and the coupling inner tube, it has coupling thermal-insulated filler to fill up in the annular cavity.
On the basis of the scheme, one end of the inner hole of the inner pipe is a conical opening.
On the basis of the scheme, the heat insulation filler and the coupling heat insulation filler are both aerogel.
On the basis of the scheme, the two ends of the inner pipe are respectively welded and fixed with the inner wall of the outer pipe, and the two ends of the coupling outer pipe and the coupling inner pipe are respectively welded and fixed.
On the basis of the scheme, the inner wall and the outer wall of the outer pipe are sequentially subjected to shot blasting treatment, antirust paint spraying, silver foil coating and rare earth thermal insulation coating spraying treatment.
On the basis of the scheme, shot blasting treatment and antirust paint spraying are sequentially carried out on the inner wall and the outer wall of the inner pipe, the rare earth thermal insulation layer is sprayed on the inner wall of the inner pipe, and the silver foil coating is coated on the outer wall of the inner pipe.
On the basis of the scheme, the external thread and the internal thread are both conical pipe thread buckles, and thread glue with a heat insulation function is sprayed between the external thread and the internal thread.
A production process of a non-vacuum heat insulation oil pipe comprises the following steps:
firstly, forming an outer pipe by a cold drawing process, and sequentially carrying out shot blasting treatment, spraying antirust paint, coating a silver foil coating and spraying a rare earth thermal insulation coating on the inner pipe wall and the outer pipe wall of the outer pipe;
secondly, forming the inner pipe by adopting a cold drawing process, upsetting one end of the inner pipe, and performing flat forging and flaring to form a conical opening; the inner and outer pipe walls of the inner pipe are respectively subjected to shot blasting treatment and antirust paint spraying, then the inner wall of the inner pipe is sprayed with a rare earth thermal insulation layer, and the outer wall of the inner pipe is coated with a silver foil coating;
welding the outer pipe and the inner pipe, and performing girth welding sealing on one end of the outer pipe and one end of the inner pipe which form a conical opening to form an annular space between the outer pipe and the inner pipe;
the coupling inner pipe and the coupling outer pipe are formed by adopting a cold drawing process, one end of the coupling inner pipe is upset to form a step, the stepped end of the coupling inner pipe is welded with the coupling outer pipe, and an annular space is formed between the coupling inner pipe and the coupling outer pipe;
preparing aerogel, namely mixing organic silicon, acetone, absolute ethyl alcohol and water according to the mass ratio: 1: 4: 4: 4, mixing, stirring uniformly, adjusting the pH value to 4 by using dilute hydrochloric acid, standing for 12 hours, adding ammonia water to adjust the pH value to 7, injecting the mixture into an annular space formed between the outer pipe and the inner pipe, and standing to obtain aerogel; aging the aerogel at room temperature for 50 hours, adding absolute ethyl alcohol, aging at 50 ℃ for 24 hours, pouring out excess liquid, putting the assembly of the inner pipe and the outer pipe into a 55 ℃ oven to be baked for 7 days, and forming an aerogel heat insulation layer (heat insulation filler) in the annular space;
the manufacturing method of the aerogel (coupling heat insulation filler) in the annular space between the coupling inner pipe and the coupling outer pipe of the pipe coupling is the same as the manufacturing method of the aerogel (heat insulation filler) in the annular space between the outer pipe and the inner pipe;
sixthly, sealing, namely sealing the other ends of the outer pipe and the inner pipe, the coupling inner pipe and the coupling outer pipe respectively after the aerogel between the outer pipe and the inner pipe, and the coupling inner pipe and the coupling outer pipe is manufactured, heating the assembly of the outer pipe and the inner pipe, and the coupling inner pipe and the coupling outer pipe to 350 ℃, keeping for 30 minutes, and welding an opening at the other end by using carbon dioxide arc welding;
seventhly, processing threads, namely processing mutually matched conical pipe thread buckles at the two ends of the outer pipe and the two ends of the coupling inner pipe respectively;
connecting the external thread and the internal thread, respectively spraying thread glue with a heat insulation function on the external thread of the outer pipe and the internal thread of the inner pipe of the coupling, and then connecting the external thread of the outer pipe and the internal thread of the inner pipe of the coupling in a threaded manner;
ninthly, testing after assembling, namely, screwing up the connecting hoop inner pipe and one end of the outer pipe far away from each other by using threads respectively to press the plug, then using the pressing instrument to press the inside of the product, and packaging the product after the pressure test is qualified.
Compared with the prior art, the invention has the beneficial effects that: a non-vacuum heat-insulating oil pipe and its production process, adopt the new structure, improve oil pipe and pipe coupling, adopt the micropore characteristic of aerogel, block the free flow of the air, cut off the way of heat convection conduction in the gas, so as to reach and insulate against heat the same effect with vacuum, block the heat radiation conduction way with insulating layer such as the multilayer silver foil, etc., use the thread of the taper pipe to buckle and connect, the good airproof performance, through the new coupling structure, the heat conduction way of the metal is blocked to the multilayer heat-insulating coating, not only has replaced the insulating layer of the vacuum structure, has evaded the drawback of the vacuum structure completely, lengthen the service life of the heat-insulating oil pipe manyfold, greatly reduced the heat loss at the same time, has raised the thermal efficiency, not only has saved the energy, but also raised the crude oil recovery efficiency, the structure of the invention is scientific and reasonable, the result.
Drawings
FIG. 1 is a schematic structural view of a non-vacuum heat-insulating oil pipe according to the present invention;
FIG. 2 is a schematic view of a connecting structure of an outer tube and an inner tube of a non-vacuum heat-insulating oil tube according to the present invention;
FIG. 3 is a schematic view of a coupling structure of a non-vacuum thermal insulating tubing according to the present invention;
FIG. 4 is a diagram of a connection state of a plurality of non-vacuum heat-insulating oil pipes according to the present invention.
The reference numbers in the figures are: 1-outer pipe, 101-external thread, 2-inner pipe, 201-conical mouth, 3-insulating filler, 4-pipe coupling, 401-coupling inner pipe, 402-internal thread, 403-coupling outer pipe and 404-coupling insulating filler.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
Referring to fig. 1 to 4, it can be known that a non-vacuum heat insulation oil pipe comprises an outer pipe 1, an inner pipe 2, a heat insulation filler 3 and a pipe coupling 4, wherein the inner pipe 2 is fixedly connected to the inside of the outer pipe 1, a sealed annular cavity is arranged between the inner pipe 2 and the outer pipe 1, the heat insulation filler 3 is filled in the annular cavity, the heat insulation filler 3 can achieve a good heat insulation effect, external threads 101 are respectively arranged at two ends of the outside of the outer pipe 1, the pipe coupling 4 is connected to the external threads 101 at one end of the outer pipe 1, the pipe coupling 4 comprises a coupling inner pipe 401, a coupling outer pipe 403 and a coupling heat insulation filler 404, an internal thread 402 is arranged on the inner side of the coupling inner pipe 401, the internal thread 402 is matched with the external threads 101, the coupling outer pipe 401 is fixedly connected to the outer side of the coupling inner pipe 401, a sealed annular, the annular cavity is filled with a coupling heat insulation filler 404, and the coupling heat insulation filler 404 can play a good heat insulation role.
One end of the inner hole of the inner tube 2 is a conical opening 201, so that welding processing is facilitated, and meanwhile, the liquid in the inner tube can flow smoothly; the heat insulation filler 3 and the coupling heat insulation filler 404 are both aerogel, the aerogel is called as one of ten new materials for changing the world, is a solid with the lowest density and the lightest weight in the world, is known as solid smoke, and has incomparable superiority when being used as a high-temperature heat insulation material; two ends of the inner pipe 2 are respectively welded and fixed with the inner wall of the outer pipe 1, two ends of the coupling outer pipe 403 and two ends of the coupling inner pipe 401 are respectively welded and fixed, and the welding and fixing have good sealing performance; the inner wall and the outer wall of the outer pipe 1 are sequentially subjected to shot blasting treatment, antirust paint spraying, silver foil coating and rare earth thermal insulation coating spraying treatment, the inner wall and the outer wall of the inner pipe 2 are sequentially subjected to shot blasting treatment and antirust paint spraying, the inner wall of the inner pipe 2 is sprayed with a rare earth thermal insulation layer, the outer wall of the inner pipe 2 is coated with a silver foil coating, and a thermal radiation conduction path can be blocked by the treatment of a plurality of layers of thermal insulation layers; external screw thread 101 and internal thread 402 are the toper pipe thread knot, have fine leakproofness behind the toper pipe thread knot interconnect to the spraying has the thread glue of thermal-insulated function between external screw thread 101 and the internal thread 402, can play fine thermal-insulated effect.
A production process of a non-vacuum heat insulation oil pipe comprises the following steps:
firstly, an outer pipe 1 is formed through a cold drawing process, the inner and outer pipe walls of the outer pipe 1 are sequentially subjected to shot blasting, antirust paint spraying, silver foil coating and rare earth thermal insulation coating spraying, and a plurality of layers of thermal insulation layers can block heat radiation conduction paths and have a good thermal insulation effect;
secondly, the inner pipe 2 is formed by adopting a cold drawing process, one end of the inner pipe is upset, and a flat forging flaring is carried out to form a conical opening 201; the inner and outer pipe walls of the inner pipe 2 are respectively subjected to shot blasting treatment and antirust paint spraying, then the inner wall of the inner pipe 2 is sprayed with a rare earth thermal insulation layer, the outer wall is coated with a silver foil coating, and the multilayer thermal insulation layer can block a heat radiation conduction path and has a good thermal insulation effect;
welding the outer pipe 1 and the inner pipe 2, and performing girth welding sealing on one end of the conical opening 201 formed by the outer pipe 1 and the inner pipe 2, so that an annular space is formed between the outer pipe 1 and the inner pipe 2, and the annular space is convenient for filling aerogel;
the pipe coupling 4 is formed by adopting a cold drawing process to form the coupling inner pipe 401 and the coupling outer pipe 403, one end of the coupling inner pipe 401 is upset to form a step, the stepped end of the coupling inner pipe 401 is welded with the coupling outer pipe 403, an annular space is formed between the coupling inner pipe 401 and the coupling outer pipe 403, and aerogel is conveniently filled in the annular space;
preparing aerogel, namely mixing organic silicon, acetone, absolute ethyl alcohol and water according to the mass ratio: 1: 4: 4: 4, mixing, stirring uniformly, adjusting the pH value to 4 by using dilute hydrochloric acid, standing for 12 hours, adding ammonia water to adjust the pH value to 7, injecting the mixture into an annular space formed between the outer tube 1 and the inner tube 2, and standing to obtain aerogel; aging the aerogel at room temperature for 50 hours, adding absolute ethyl alcohol, aging at 50 ℃ for 24 hours, pouring out the redundant liquid, putting the assembly of the inner tube 2 and the outer tube 1 into a 55 ℃ oven to be baked for 7 days, and forming an aerogel heat insulation layer (heat insulation filler 3) in the annular space;
the aerogel (coupling insulating filler 404) in the annular space between the coupling inner tube 401 and the coupling outer tube 403 of the pipe coupling 4 is produced in the same manner as the aerogel (insulating filler 3) in the annular space between the outer tube 1 and the inner tube 2;
sealing, namely after the aerogel between the outer pipe 1 and the inner pipe 2 and between the coupling inner pipe 401 and the coupling outer pipe 403 are manufactured, respectively sealing the other ends of the outer pipe 1 and the inner pipe 2, the coupling inner pipe 401 and the coupling outer pipe 403, heating the assembly of the outer pipe 1 and the inner pipe 2, the coupling inner pipe 401 and the coupling outer pipe 403 to 350 ℃, keeping the temperature for 30 minutes, and welding an opening at the other end by using carbon dioxide arc welding;
seventhly, processing threads, namely processing matched conical pipe thread buckles at two ends of the outer pipe 1 and two ends of the coupling inner pipe 401 respectively, wherein the conical pipe thread buckles have good sealing property;
connecting the external thread 101 with the internal thread 402, respectively spraying thread glue with a heat insulation function on the external thread 101 of the outer tube 1 and the internal thread 402 of the inner tube 401 of the coupling, and then connecting the external thread 101 of the outer tube 1 and the internal thread 402 of the inner tube 401 of the coupling in a threaded manner, wherein the thread glue can ensure thread sealing property and has good heat insulation property;
ninthly, testing after assembling, namely, screwing up the pressing plug by using the threads respectively at one end of the finished product, namely, the inner pipe 401 of the coupling and the end of the outer pipe 1 which are far away from each other, then pressing the inside of the product by using the pressing instrument, packaging the qualified product for factory use after pressure testing, and performing fine detection on the pressure born by the product by pressing the testing process as the prior art.
The principle and the advantages of the invention are as follows: the utility model provides a non-vacuum heat insulation oil pipe uses novel material and new manufacturing process, makes brand-new insulating layer, replaces the vacuum thermal insulation environment, thoroughly solves the easy destroyed drawback of vacuum environment, and it is effectual to make thermal-insulated, and the thermal efficiency is high, and the fault rate is low, long service life's non-vacuum heat insulation oil pipe:
1. the thermal insulation pipe has the advantages that the vacuum environment is cancelled, the aerogel is used as a main body to manufacture a composite thermal insulation layer, the aerogel is called as one of ten new materials for changing the world, the aerogel is a solid with the smallest density and the lightest weight in the world and is known as solid-state smoke, the aerogel has incomparable superiority when being used as a high-temperature thermal insulation material, the aerogel is used as a thermal insulation layer manufactured by the main body to replace a vacuum cavity as the thermal insulation layer, the free activity of hydrogen molecules can be isolated, the damage of the hydrogen permeation phenomenon to the vacuum thermal insulation layer is completely avoided, the service life of the thermal insulation oil pipe is greatly.
2. The coupling is processed into a double-layer heat insulation structure to be made into a heat insulation coupling, so that an overlapping area is formed on the heat insulation parts of the oil pipe and the coupling, and a heat conduction channel of metal on the pipe wall is blocked.
3. The inner wall of the oil pipe is coated with a heat insulation coating, so that the hot steam of the inner pipe can not directly contact the metal pipe wall of the inner pipe, and a direct heat conduction channel between the steam and the inner pipe wall is blocked.
4. The connecting thread is designed into a taper pipe thread buckle, and is a thread capable of sealing steam, so that the leakage of the steam is avoided.
5. The taper pipe thread buckle is an existing mature thread structure, has good sealing performance, and the front end face of the external thread of the oil pipe and the rear end face of the internal thread of the coupling are designed to be sealed, so that a metal hard sealing structure is adopted, the sealing effect is enhanced, and the leakage of steam is avoided.
6. The thread of the outer pipe 1 and the thread of the coupling inner pipe 401 are coated with thread glue with heat insulation function, so that the outer pipe 1 and the metal surface of the coupling inner pipe 401 are not in direct contact, and the direct contact heat conduction path between metals is cut off.
7. In the pipe coupling 4, an insulator is designed at the joint of the two outer pipes 1.
8. Silver foils are coated on the outer wall of the inner pipe, the inner wall and the outer wall of the outer pipe and the inner wall and the outer wall of the coupling to block heat radiation paths.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. The utility model provides a non-vacuum heat insulating oil pipe, includes outer tube (1), inner tube (2), thermal-insulated filler (3) and pipe coupling (4), its characterized in that: the inner part of the outer pipe (1) is fixedly connected with an inner pipe (2), a sealed annular cavity is arranged between the inner pipe (2) and the outer pipe (1), the annular cavity is filled with heat insulation filler (3), two external threads (101) are respectively arranged at two ends of the outer part of the outer pipe (1), the external thread (101) at one end of the outer pipe (1) is connected with a pipe coupling (4), the pipe coupling (4) comprises a coupling inner pipe (401), a coupling outer pipe (403) and a coupling heat insulation filler (404), the inner side of the coupling inner pipe (401) is provided with internal threads (402), the internal threads (402) are matched with the external threads (101), the coupling inner tube (401) outside fixedly connected with coupling outer tube (403), be equipped with sealed annular cavity between coupling outer tube (403) and coupling inner tube (401), it has coupling heat insulating filler (404) to fill up in the annular cavity.
2. The non-vacuum heat insulation oil pipe according to claim 1, characterized in that one end of the inner hole of the inner pipe (2) is a conical opening (201).
3. The non-vacuum insulation tubing as claimed in claim 1, wherein the insulation filler (3) and the collar insulation filler (404) are both aerogel.
4. The non-vacuum heat insulation oil pipe according to claim 1, wherein both ends of the inner pipe (2) are respectively welded and fixed with the inner wall of the outer pipe (1), and both ends of the coupling outer pipe (403) and the coupling inner pipe (401) are respectively welded and fixed.
5. The non-vacuum heat insulation oil pipe according to claim 1, wherein the outer pipe (1) has its inner and outer walls treated by shot blasting, spraying of rust-proof paint, coating of silver foil and spraying of rare earth thermal insulation coating in this order.
6. The non-vacuum heat insulation oil pipe according to claim 1, wherein the inner wall and the outer wall of the inner pipe (2) are sequentially subjected to shot blasting and antirust paint spraying, the inner wall of the inner pipe (2) is coated with a rare earth heat insulation layer, and the outer wall of the inner pipe (2) is coated with a silver foil coating.
7. The non-vacuum heat insulation oil pipe according to claim 1, wherein the external thread (101) and the internal thread (402) are both tapered pipe thread buckles, and thread glue with a heat insulation function is sprayed between the external thread (101) and the internal thread (402).
8. The non-vacuum heat insulation oil pipe according to claim 1, characterized in that the production process comprises:
firstly, an outer pipe (1) is formed by a cold drawing process, and the inner pipe wall and the outer pipe wall of the outer pipe (1) are sequentially subjected to shot blasting treatment, antirust paint spraying, silver foil coating and rare earth heat preservation coating spraying;
secondly, the inner pipe (2) is formed by adopting a cold drawing process, one end of the inner pipe is upset, and a flat forging flaring is formed into a conical opening (201); the inner and outer pipe walls of the inner pipe (2) are respectively subjected to shot blasting treatment and antirust paint spraying, then the inner wall of the inner pipe (2) is sprayed with a rare earth thermal insulation layer, and the outer wall is coated with a silver foil coating;
welding the outer pipe (1) and the inner pipe (2), and performing girth welding sealing on one end of the outer pipe (1) and one end of the inner pipe (2) which form a conical opening (201), so that an annular space is formed between the outer pipe (1) and the inner pipe (2);
the coupling inner tube (401) and the coupling outer tube (403) are formed by adopting a cold drawing process, one end of the coupling inner tube (401) is upset to form a step, the stepped end of the coupling inner tube (401) is welded with the coupling outer tube (403), and an annular space is formed between the coupling inner tube (401) and the coupling outer tube (403);
preparing aerogel, namely mixing organic silicon, acetone, absolute ethyl alcohol and water according to the mass ratio: 1: 4: 4: 4, mixing, stirring uniformly, adjusting the pH value to 4 by using dilute hydrochloric acid, standing for 12 hours, adding ammonia water to adjust the pH value to 7, injecting the mixture into an annular space formed between the outer pipe (1) and the inner pipe (2), and standing to obtain aerogel; aging the aerogel at room temperature for 50 hours, adding absolute ethyl alcohol, aging at 50 ℃ for 24 hours, pouring out redundant liquid, putting the assembly of the inner tube (2) and the outer tube (1) into a 55 ℃ oven to be baked for 7 days, and forming an aerogel heat insulation layer (heat insulation filler (3)) in the annular space;
the mode of manufacturing the aerogel (coupling heat insulation filler (404)) in the annular space between the coupling inner pipe (401) and the coupling outer pipe (403) of the pipe coupling (4) is the same as the mode of manufacturing the aerogel (heat insulation filler (3)) in the annular space between the outer pipe (1) and the inner pipe (2);
sixthly, sealing, namely after the aerogel between the outer pipe (1) and the inner pipe (2) and between the coupling inner pipe (401) and the coupling outer pipe (403) is manufactured, respectively sealing the other ends of the outer pipe (1) and the inner pipe (2), the coupling inner pipe (401) and the coupling outer pipe (403), heating the assembly of the outer pipe (1) and the inner pipe (2), the coupling inner pipe (401) and the coupling outer pipe (403) to 350 ℃, keeping for 30 minutes, and welding an opening at the other end by using carbon dioxide arc welding;
seventhly, processing threads, namely processing conical pipe thread buckles matched with each other at two ends of the outer pipe (1) and two ends of the coupling inner pipe (401) respectively;
connecting the external thread (101) with the internal thread (402), respectively spraying thread glue with a heat insulation function on the external thread (101) of the outer pipe (1) and the internal thread (402) of the inner pipe (401) of the coupling, and then connecting the external thread (101) of the outer pipe (1) with the internal thread (402) of the inner pipe (401) of the coupling in a threaded manner;
ninthly, testing after assembling, namely, screwing up the end plug by adopting threads to press one end of the product after the assembly is completed, namely, the coupling inner tube (401) and the outer tube (1) are mutually far away, then pressing the inside of the product by using a pressing instrument, and packaging the product after the pressure test is qualified.
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| CN202010668358.7A CN111594060A (en) | 2020-07-13 | 2020-07-13 | Non-vacuum heat insulation oil pipe and production process thereof |
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| CN202010668358.7A CN111594060A (en) | 2020-07-13 | 2020-07-13 | Non-vacuum heat insulation oil pipe and production process thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113464059A (en) * | 2021-04-28 | 2021-10-01 | 天津钢管制造有限公司 | Double-layer sleeve design method |
| CN113464733A (en) * | 2021-07-01 | 2021-10-01 | 滁州熙诚环保科技有限公司 | Anti-aging PP pipe and production process thereof |
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- 2020-07-13 CN CN202010668358.7A patent/CN111594060A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113464059A (en) * | 2021-04-28 | 2021-10-01 | 天津钢管制造有限公司 | Double-layer sleeve design method |
| CN113464059B (en) * | 2021-04-28 | 2022-08-12 | 天津钢管制造有限公司 | Double-layer sleeve design method |
| CN113464733A (en) * | 2021-07-01 | 2021-10-01 | 滁州熙诚环保科技有限公司 | Anti-aging PP pipe and production process thereof |
| CN113464733B (en) * | 2021-07-01 | 2022-09-30 | 滁州熙诚环保科技有限公司 | Anti-aging PP pipe and production process thereof |
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