CN111594060B - A non-vacuum insulated oil pipe and its production process - Google Patents
A non-vacuum insulated oil pipe and its production process Download PDFInfo
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- CN111594060B CN111594060B CN202010668358.7A CN202010668358A CN111594060B CN 111594060 B CN111594060 B CN 111594060B CN 202010668358 A CN202010668358 A CN 202010668358A CN 111594060 B CN111594060 B CN 111594060B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 238000010168 coupling process Methods 0.000 claims abstract description 131
- 238000005859 coupling reaction Methods 0.000 claims abstract description 131
- 230000008878 coupling Effects 0.000 claims abstract description 128
- 239000000945 filler Substances 0.000 claims abstract description 34
- 238000009413 insulation Methods 0.000 claims description 72
- 239000003921 oil Substances 0.000 claims description 43
- 239000004964 aerogel Substances 0.000 claims description 22
- 239000011248 coating agent Substances 0.000 claims description 19
- 238000000576 coating method Methods 0.000 claims description 19
- 238000005507 spraying Methods 0.000 claims description 18
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 14
- 238000005422 blasting Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 12
- 239000003973 paint Substances 0.000 claims description 12
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 12
- 150000002910 rare earth metals Chemical class 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 10
- 238000003466 welding Methods 0.000 claims description 10
- 238000010622 cold drawing Methods 0.000 claims description 9
- 238000012360 testing method Methods 0.000 claims description 9
- 238000004321 preservation Methods 0.000 claims description 7
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 230000032683 aging Effects 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 239000012207 thread-locking agent Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 4
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 3
- 239000001569 carbon dioxide Substances 0.000 claims description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 3
- 238000005242 forging Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 10
- 239000010410 layer Substances 0.000 description 24
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 5
- 229910052739 hydrogen Inorganic materials 0.000 description 5
- 239000001257 hydrogen Substances 0.000 description 5
- 239000003208 petroleum Substances 0.000 description 5
- 230000005855 radiation Effects 0.000 description 5
- 238000010795 Steam Flooding Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 238000010793 Steam injection (oil industry) Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- 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
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Thermal Insulation (AREA)
Abstract
本发明公开了一种非真空隔热油管，包括外管、内管、隔热填充物和管接箍，所述外管的内部固定连接有内管，所述内管与外管之间设有密封的环形空腔，所述环形空腔内填满有隔热填充物，所述外管的外部两端分别设有外螺纹，所述外管一端的外螺纹上连接有管接箍，所述管接箍包括接箍内管、接箍外管和接箍隔热填充物，所述接箍内管内侧设有内螺纹，所述内螺纹与外螺纹相互匹配，所述接箍内管外侧固定连接有接箍外管，所述接箍外管和接箍内管之间设有密封的环形空腔，所述环形空腔内填满有接箍隔热填充物。本发明还公开了一种非真空隔热油管生产工艺。本发明结构科学合理，使用效果好，适合推广使用。
The present invention discloses a non-vacuum insulated oil pipe, comprising an outer pipe, an inner pipe, an insulating filler and a pipe coupling. The inner pipe is fixedly connected to the inner part of the outer pipe, a sealed annular cavity is provided between the inner pipe and the outer pipe, the annular cavity is filled with insulating filler, external threads are respectively provided at the two outer ends of the outer pipe, a pipe coupling is connected to the external threads at one end of the outer pipe, the pipe coupling comprises a coupling inner pipe, a coupling outer pipe and a coupling insulating filler, an internal thread is provided on the inner side of the coupling inner pipe, the internal thread and the external thread match each other, a coupling outer pipe is fixedly connected to the outer side of the coupling inner pipe, a sealed annular cavity is provided between the coupling outer pipe and the coupling inner pipe, the annular cavity is filled with coupling insulating filler. The present invention also discloses a production process for non-vacuum insulated oil pipe. The present invention has a scientific and reasonable structure, good use effect, and is suitable for popularization and use.
Description
Technical Field
The invention relates to the field of petroleum exploitation, in particular to a non-vacuum heat-insulating oil pipe and a production process thereof.
Background
Along with the continuous development of the petroleum exploitation industry and the continuous increase of petroleum consumption, the exploitation of thick oil becomes a main yield source of a plurality of petroleum companies at home and abroad, and the annual yield of the thick oil in China reaches more than 1500 ten thousand tons. The thick oil exploitation usually has two exploitation modes of steam huff and puff and steam flooding, and the steam huff and puff refers to a thick oil exploitation method for completing three processes of steam injection, well soaking and well opening production in the well. Steam flooding refers to continuous steam injection from a gas injection well through a suitable well pattern, forming a steam zone around the injection well, and the injected steam heats and drives the subsurface crude oil to surrounding production wells for production. By nineties, the thickened oil exploitation of China mainly uses a steam huff-puff well, but the thickened oil exploitation of domestic oil fields by adopting a steam huff-puff exploitation technology generally enters a high-turn, and the thickened oil steam flooding well exploitation mode is adopted, so that the recovery ratio of the thickened oil fields after entering the high-turn exploitation stage can be effectively improved, and the method has an outstanding effect on improving the thickened oil yield. However, along with the transition of the thickened oil exploitation mode from a steam huff-and-puff well to a steam flooding well, higher requirements are also put on the oil pipe.
When the thick oil is extracted by steam injection, an oil pipe with heat insulation and heat preservation functions is needed to reduce heat loss, improve steam dryness, and protect an oil well casing and a well cementation cement sheath from being damaged by thermal stress. The vacuum heat-insulating oil pipe used in the current oil extraction operation is a double-layer concentric pipe column, the annular space of the two layers of pipe is filled with heat-insulating materials, vacuumized and added with a getter.
The disadvantage of this insulated tubing is:
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 poor until the oil pipe is invalid. The hydrogen permeation phenomenon is that hydrogen molecules are extremely small in volume, high in activity and extremely high in permeability, pass through metal plates without defects under enough pressure, enter the vacuum heat insulation pipe, damage the vacuum environment, become a main cause of failure of the vacuum heat insulation pipe, the theoretical life of the vacuum heat insulation pipe is 7 years, heat preservation failure can be realized in a period of less than one year in practice, and the service cost is extremely high for thick oil recovery, particularly for offshore thick oil recovery, so that the vacuum heat insulation environment is replaced, and the service life of the heat insulation pipe is remarkably prolonged.
2, As the threaded connection part of the pipe head thread and the coupling is not provided with a heat insulation layer and a heat conduction channel exists, heat leakage exists at the oil pipe connection part.
And 3, the coupling is of a single-layer structure and is not provided with a heat insulation layer, so that a heat conduction path exists at the coupling, and internal heat loss is caused.
4, The threads use American Petroleum standard API buttress threads, so that the steam can not be completely sealed, 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 prior vacuum heat-insulating oil pipe in the prior art.
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, heat insulation filler and coupling, the inside fixedly connected with inner tube of outer tube, be equipped with sealed annular cavity between inner tube and the outer tube, the annular cavity intussuseption is filled with the heat insulation filler, 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 coupling includes coupling inner tube, coupling outer tube and coupling heat insulation filler, coupling inner tube inboard is equipped with the internal screw thread, internal screw thread and external screw thread mutually support, 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, annular cavity intussuseption is filled with the heat insulation filler.
On the basis of the scheme, one end of the inner hole of the inner tube is a conical opening.
On the basis of the scheme, the heat insulation filler and the coupling heat insulation filler are aerogel.
On the basis of the scheme, two ends of the inner pipe are welded and fixed with the inner wall of the outer pipe respectively, and two ends of the coupling outer pipe and the coupling inner pipe are welded and fixed respectively.
On the basis of the scheme, the inner wall and the outer wall of the outer tube are sequentially subjected to shot blasting treatment, rust-proof paint spraying, silver foil coating and rare earth thermal insulation coating spraying.
On the basis of the scheme, the inner wall and the outer wall of the inner tube are subjected to shot blasting treatment and rust-proof paint spraying in sequence, the inner wall of the inner tube is sprayed with a rare earth heat preservation layer, and the outer wall of the inner tube is coated with a silver foil coating.
On the basis of the scheme, the external thread and the internal thread are conical pipe thread buckles, and a heat insulation function thread adhesive is sprayed between the external thread and the internal thread.
The production process of the non-vacuum heat-insulating oil pipe comprises the following steps:
① The outer tube is formed through a cold drawing process, and the inner tube wall and the outer tube wall of the outer tube are subjected to shot blasting treatment, rust-proof paint spraying, silver foil coating and rare earth thermal insulation coating spraying in sequence;
② The inner tube is formed by adopting a cold drawing process, one end of the inner tube is upset, and a conical opening is formed by flat forging and flaring; the inner and outer tube walls of the inner tube are respectively subjected to shot blasting treatment and rust-proof paint spraying, then the inner wall of the inner tube is sprayed with a rare earth heat preservation layer, and the outer wall is coated with a silver foil coating;
③ The outer tube and the inner tube are welded, tapering the outer and inner tubes one end of the mouth is sealed by ring welding, forming an annular space between the outer tube and the inner tube;
④ The pipe coupling, coupling inner tube and coupling outer tube adopt the cold drawing process to shape, one end of the coupling inner tube is upset to form the step, the one end with step of the coupling inner tube is welded with coupling outer tube, form the annular space between coupling inner tube and coupling outer tube;
⑤ Preparing aerogel, namely mixing organic silicon, acetone, absolute ethyl alcohol and water according to the mass ratio: 1:4:4:4, mixing, fully and uniformly stirring, regulating the pH value to be 4 by dilute hydrochloric acid, standing for 12 hours, adding ammonia water to regulate the pH value to be 7, then injecting into an annular space formed between the outer pipe and the inner pipe, and standing to form aerogel; aging aerogel for 50 hours at room temperature, adding absolute ethyl alcohol, aging for 24 hours at 50 ℃, pouring out redundant liquid, and placing the assembly of the inner tube and the outer tube into a 55 ℃ oven for baking for 7 days to form a heat-insulating filler in an annular space;
The manufacturing mode of the 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 that of the heat insulation filler in the annular space between the outer pipe and the inner pipe;
⑥ Sealing, namely sealing the other ends of the outer pipe and the inner pipe, the coupling inner pipe and the coupling outer pipe after aerogel among the outer pipe and the inner pipe and between the coupling inner pipe and the coupling outer pipe is manufactured, heating the assembly of the outer pipe and the inner pipe, the coupling inner pipe and the coupling outer pipe to 350 ℃, keeping for 30 minutes, and welding the opening at the other end by carbon dioxide arc welding;
⑦ Thread processing, namely respectively processing conical pipe thread buckles matched with each other at two ends of the outer pipe and two ends of the inner pipe of the coupling;
⑧ The external thread is connected with the internal thread, the external thread of the outer pipe and the internal thread of the coupling inner pipe are respectively sprayed with a heat insulation function of the thread adhesive, and then the external thread of the outer pipe is connected with the internal thread of the coupling inner pipe in a threaded manner;
⑨ And after the assembly, testing, namely screwing the end caps on the ends, far away from each other, of the inner pipe and the outer pipe of the coupling by adopting threads, and then using a pressing instrument to perform the pressing test on the inside of the product, wherein the products can be packaged and delivered for use after the pressure test is qualified.
Compared with the prior art, the invention has the following beneficial effects: the invention relates to a non-vacuum heat-insulating oil pipe and a production process thereof, which adopt a novel structure, improve the oil pipe and the pipe joint, adopt the micropore characteristic of aerogel, block the free flow of air, cut off the way of heat convection conduction in gas so as to achieve the same effect as vacuum heat insulation, block the heat radiation conduction way by using a plurality of layers of heat-insulating layers such as silver foil, and the like, adopt a conical pipe thread fastener for connection, have good sealing property, and block the heat conduction way of metal by using a novel coupling structure, thereby not only replacing the heat-insulating layer of the vacuum structure, thoroughly avoiding the defect of the vacuum structure, prolonging the service life of the heat-insulating oil pipe in a multiplied way, greatly reducing the heat loss, improving the heat efficiency, saving energy sources, improving the recovery ratio of crude oil, realizing scientific and reasonable structure and good use effect, and being suitable for popularization and use.
Drawings
FIG. 1 is a schematic diagram of a non-vacuum insulated tubing of the present invention;
FIG. 2 is a schematic view of the connection structure of the outer tube and the inner tube of a non-vacuum heat-insulating oil tube according to the present invention;
FIG. 3 is a schematic view of a pipe joint structure of a non-vacuum insulated oil pipe according to the present invention;
FIG. 4 is a diagram showing a plurality of connection states of the non-vacuum heat-insulating oil pipe according to the present invention.
The reference numerals in the figures are: 1-outer tube, 101-external thread, 2-inner tube, 201-conical mouth, 3-insulation filler, 4-tube coupling, 401-coupling inner tube, 402-internal thread, 403-coupling outer tube, 404-coupling insulation filler.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
Referring to fig. 1 to 4, it can be seen 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 joint 4, wherein the inner pipe 2 is fixedly connected with the inner pipe 1, a sealed annular cavity is arranged between the inner pipe 2 and the outer pipe 1, the annular cavity is filled with the heat insulation filler 3, the heat insulation filler 3 can play a good heat insulation role, two external ends of the outer pipe 1 are respectively provided with an external thread 101, the pipe joint 4 is connected with the external thread 101 at one end of the outer pipe 1, the pipe joint 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 at the inner side of the coupling inner pipe 401, the internal thread 402 is mutually matched with the external thread 101, the outer pipe 403 is fixedly connected with the outer pipe 401, a sealed annular cavity is arranged between the coupling 403 and the inner pipe 401, the annular cavity is filled with the heat insulation filler 404, and the coupling 4 can play a good heat insulation role.
One end of the inner hole of the inner tube 2 is provided with a conical opening 201, so that welding processing is facilitated, and meanwhile, internal liquid can flow smoothly; the heat insulation filler 3 and the coupling heat insulation filler 404 are both aerogel, the aerogel is one of ten new materials changing the world, is the solid with the minimum 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; the two ends of the inner pipe 2 are respectively welded and fixed with the inner wall of the outer pipe 1, the two ends of the coupling outer pipe 403 and the coupling inner pipe 401 are respectively welded and fixed, and the welded and fixed parts have good tightness; the inner wall and the outer wall of the outer tube 1 are sequentially subjected to shot blasting treatment, rust-proof paint spraying, silver foil coating and rare earth thermal insulation coating spraying, the inner wall and the outer wall of the inner tube 2 are sequentially subjected to shot blasting treatment and rust-proof paint spraying, the inner wall of the inner tube 2 is sprayed with a rare earth thermal insulation layer, the outer wall of the inner tube 2 is coated with a silver foil coating, and a heat radiation conduction path can be blocked by using the treatment of a plurality of layers of thermal insulation layers; the external thread 101 and the internal thread 402 are conical pipe thread buckles, the conical pipe thread buckles have good sealing performance after being connected with each other, and the external thread 101 and the internal thread 402 are sprayed with the heat insulation function of the thread glue, so that a good heat insulation effect can be achieved.
A non-vacuum heat-insulating oil pipe production process comprises the following steps:
① The outer tube 1 is formed through a cold drawing process, and the inner and outer tube walls of the outer tube 1 are subjected to shot blasting treatment, rust-proof paint spraying, silver foil coating spraying and rare earth thermal insulation coating spraying in sequence, and the multi-layer thermal insulation layer can block heat radiation conduction paths and has good thermal insulation effect;
② The inner tube 2 is formed by adopting a cold drawing process, one end of the inner tube is upset, and a conical opening 201 is formed by flat forging and flaring; the inner pipe wall and the outer pipe wall of the inner pipe 2 are respectively subjected to shot blasting treatment and rust-proof paint spraying, then the inner wall of the inner pipe 2 is sprayed with a rare earth heat preservation layer, the outer wall is coated with a silver foil coating, and the multi-layer heat insulation layer can block heat radiation conduction paths and has good heat insulation effect;
③ The outer tube 1 and the inner tube 2 are welded, one end of the outer tube 1 and one end of the inner tube 2, which form a conical opening 201, are subjected to ring welding and sealing, an annular space is formed between the outer tube 1 and the inner tube 2, and aerogel is conveniently filled in the annular space;
④ The pipe coupling 4, the coupling inner pipe 401 and the coupling outer pipe 403 are formed by adopting a cold drawing process, one end of the coupling inner pipe 401 is upset to form a step, one end of the coupling inner pipe 401 with the step 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 filled in the annular space conveniently;
⑤ Preparing aerogel, namely mixing organic silicon, acetone, absolute ethyl alcohol and water according to the mass ratio: 1:4:4:4, mixing, fully and uniformly stirring, regulating the pH value to 4 by using dilute hydrochloric acid, standing for 12 hours, adding ammonia water to regulate the pH value to 7, then injecting into an annular space formed between the outer tube 1 and the inner tube 2, and standing to form aerogel; aging aerogel for 50 hours at room temperature, adding absolute ethyl alcohol, aging for 24 hours at 50 ℃, pouring out redundant liquid, and placing the assembly of the inner tube 2 and the outer tube 1 into a 55 ℃ oven for baking for 7 days to form a heat-insulating filler 3 in an annular space;
The manufacturing mode of the 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 manufacturing mode of the heat insulation filler 3 in the annular space between the outer pipe 1 and the inner pipe 2;
⑥ Sealing, namely after the aerogel among the outer tube 1, the inner tube 2, the coupling inner tube 401 and the coupling outer tube 403 is manufactured, sealing the other ends of the outer tube 1, the inner tube 2, the coupling inner tube 401 and the coupling outer tube 403 respectively, heating the assembly of the outer tube 1, the inner tube 2, the coupling inner tube 401 and the coupling outer tube 403 to 350 ℃, keeping for 30 minutes, and welding the opening at the other end by carbon dioxide arc welding;
⑦ The thread processing is carried out, and conical pipe thread buckles matched with each other are respectively processed at the two ends of the outer pipe 1 and the two ends of the coupling inner pipe 401, so that the conical pipe thread buckles have good tightness;
⑧ The external thread 101 is connected with the internal thread 402, the external thread 101 of the outer pipe 1 and the internal thread 402 of the coupling inner pipe 401 are respectively sprayed with heat insulation function of the thread adhesive, then the external thread 101 of the outer pipe 1 and the internal thread 402 of the coupling inner pipe 401 are connected in a threaded manner, and the thread adhesive can ensure thread tightness and has good heat insulation property;
⑨ After assembly, testing, namely screwing the end caps on the ends, far away from each other, of the inner tube 401 and the outer tube 1 of the coupling, respectively, using a pressing instrument to press the inside of the product, and packaging the product for delivery after the pressure test is qualified, wherein the pressing test technology is the prior mature technology, and can be used for well detecting the pressure born by the product.
The principle and the advantages of the invention are that: the non-vacuum heat-insulating oil pipe uses new materials and new manufacturing process to manufacture a brand new heat-insulating layer to replace a vacuum heat-insulating environment, thoroughly solves the defect that the vacuum environment is easily damaged, and is good in heat-insulating effect, high in heat efficiency, low in failure rate and long in service life.
1. The vacuum environment is canceled, the aerogel is used as a main body to manufacture a composite heat insulation layer, the aerogel is one of ten new materials changing the world, is a solid with minimum density and lightest weight in the world, is known as solid smoke, has incomparable superiority when being used as a high-temperature heat insulation material, and replaces a vacuum cavity as the heat insulation layer by using the heat insulation layer manufactured by using the aerogel as the main body, so that the free movement of hydrogen molecules can be isolated, the damage of hydrogen permeation phenomenon to the vacuum heat insulation layer is completely avoided, the service life of the heat insulation oil pipe is greatly prolonged, and the theoretical service life of the heat insulation oil pipe is reached.
2. The coupling is processed into a double-layer heat insulation structure, and the double-layer heat insulation structure is made into a heat insulation coupling, so that an overlapping area is formed between the oil pipe and the heat insulation part of the coupling, and a heat conduction channel of pipe wall metal is blocked.
3. The inner wall of the oil pipe is coated with a heat-insulating coating, so that the hot steam of the inner pipe cannot 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 screw thread is designed into a conical pipe screw thread buckle, so that the steam can be sealed, and the leakage of the steam is avoided.
5. The conical pipe thread fastener is of an existing mature thread structure, has good sealing performance, and is designed to be sealed with the end face of the front end of the external thread of the oil pipe and the end face of the rear end of the internal thread of the coupling.
6. The screw thread of the outer tube 1 and the screw thread of the coupling inner tube 401 are coated with screw thread glue with heat insulation function, so that the metal surfaces of the outer tube 1 and the coupling inner tube 401 are not in direct contact, and the direct contact heat conduction path between metals is cut off.
7. In the pipe coupling 4, a heat insulator is provided at the junction between the two outer pipes 1.
8. Silver foil is coated on the outer wall of the inner pipe, the outer wall of the outer pipe and the inner and outer walls of the collar to block the heat radiation path.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (1)
1. The utility model provides a non-vacuum heat insulation oil pipe, includes outer tube (1), inner tube (2), thermal-insulated filler (3) and pipe coupling (4), its characterized in that: the inner pipe (2) is fixedly connected to the inside of the outer pipe (1), a sealed annular cavity is formed between the inner pipe (2) and the outer pipe (1), the annular cavity is filled with heat insulation filler (3), external threads (101) are respectively arranged at two ends of the outside of the outer pipe (1), a 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 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), an outer coupling pipe (403) is fixedly connected to the outer side of the coupling inner pipe (401), and a sealed annular cavity is formed between the coupling outer pipe (403) and the coupling inner pipe (401), and the coupling heat insulation filler (404) is filled in the annular cavity.
One end of the inner hole of the inner tube (2) is provided with a conical opening (201);
The heat insulation filler (3) and the coupling heat insulation filler (404) are aerogel;
two ends of the inner pipe (2) are respectively welded and fixed with the inner wall of the outer pipe (1), and two ends of the coupling outer pipe (403) and the coupling inner pipe (401) are respectively welded and fixed;
The inner wall and the outer wall of the outer tube (1) are sequentially subjected to shot blasting treatment, rust-proof paint spraying, silver foil coating and rare earth thermal insulation coating spraying;
The inner wall and the outer wall of the inner tube (2) are subjected to shot blasting treatment and rust-proof paint spraying in sequence, a rare earth heat preservation layer is sprayed on the inner wall of the inner tube (2), and a silver foil coating is coated on the outer wall of the inner tube (2);
The external thread (101) and the internal thread (402) are conical pipe thread buckles, and a heat insulation function thread adhesive is sprayed between the external thread (101) and the internal thread (402);
The production process of the non-vacuum heat-insulating oil pipe comprises the following steps:
① The outer tube (1) is formed through a cold drawing process, and the inner tube wall and the outer tube wall of the outer tube (1) are subjected to shot blasting treatment, rust-proof paint spraying, silver foil coating and rare earth thermal insulation coating in sequence;
② The inner tube (2) is formed by adopting a cold drawing process, one end of the inner tube is upset, and a conical opening (201) is formed by flat forging and flaring; the inner and outer tube walls of the inner tube (2) are respectively subjected to shot blasting treatment and rust-proof paint spraying, then the inner wall of the inner tube (2) is sprayed with a rare earth heat preservation layer, and the outer wall is coated with a silver foil coating;
③ The outer tube (1) and the inner tube (2) are welded, one end of the conical opening (201) formed by the outer tube (1) and the inner tube (2) is sealed in a ring welding way, and an annular space is formed between the outer tube (1) and the inner tube (2);
④ The pipe coupling (4), the coupling inner pipe (401) and the coupling outer pipe (403) are formed by adopting a cold drawing process, one end of the coupling inner pipe (401) is upset to form a step, one end of the coupling inner pipe (401) with the step is welded with the coupling outer pipe (403), and an annular space is formed between the coupling inner pipe (401) and the coupling outer pipe (403);
⑤ Preparing aerogel, namely mixing organic silicon, acetone, absolute ethyl alcohol and water according to the mass ratio: 1:4:4:4, mixing, fully and uniformly stirring, regulating the pH value to be 4 by dilute hydrochloric acid, standing for 12 hours, adding ammonia water to regulate the pH value to be 7, then injecting into an annular space formed between the outer tube (1) and the inner tube (2), and standing to form aerogel; aging aerogel for 50 hours at room temperature, adding absolute ethyl alcohol, aging for 24 hours at 50 ℃, pouring out redundant liquid, and placing the assembly of the inner tube (2) and the outer tube (1) into a 55 ℃ oven for baking for 7 days to form a heat-insulating filler (3) in an annular space;
The manufacturing mode of the 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 manufacturing mode of the heat insulation filler (3) in the annular space between the outer pipe (1) and the inner pipe (2);
⑥ Sealing, namely after aerogel among the outer tube (1) and the inner tube (2), the coupling inner tube (401) and the coupling outer tube (403) is manufactured, respectively sealing the other ends of the outer tube (1) and the inner tube (2), the coupling inner tube (401) and the coupling outer tube (403), heating an assembly of the outer tube (1) and the inner tube (2), the coupling inner tube (401) and the coupling outer tube (403) to 350 ℃, keeping for 30 minutes, and welding the opening at the other end by carbon dioxide arc welding;
⑦ Thread processing, namely respectively processing conical pipe thread buckles matched with each other at the two ends of the outer pipe (1) and the two ends of the coupling inner pipe (401);
⑧ The external thread (101) is connected with the internal thread (402), the external thread (101) of the outer pipe (1) and the internal thread (402) of the coupling inner pipe (401) are respectively sprayed with a heat insulation function of a thread adhesive, and then the external thread (101) of the outer pipe (1) is in threaded connection with the internal thread (402) of the coupling inner pipe (401);
⑨ And after assembly, testing, namely screwing the end caps on the ends, far away from each other, of the inner tube (401) and the outer tube (1) of the coupling by adopting threads, and then using a pressing instrument to perform pressing test on the inside of the product, wherein the products can be packaged and delivered for use after the pressure test is qualified.
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| CN114458172B (en) * | 2020-12-29 | 2024-10-11 | 中国海洋石油集团有限公司 | Coupling-free whole-course heat-preservation heat-insulation oil pipe and manufacturing method thereof |
| CN113236142A (en) * | 2021-03-03 | 2021-08-10 | 沧州润涛石油设备有限公司 | Double-layer vacuum insulation pipe, sucker rod and assembly process |
| CN113464059B (en) * | 2021-04-28 | 2022-08-12 | 天津钢管制造有限公司 | Double-layer sleeve design method |
| 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 |
| CN118257565A (en) * | 2022-12-26 | 2024-06-28 | 中国石油天然气股份有限公司 | A heat insulation device for improving the steam dryness at the bottom of a well |
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