Engineering seamless treatment continuous pipe for hydrogen injection of underground hydrogen storage library and preparation method of engineering seamless treatment continuous pipe

Abstract

The invention provides an engineering seamless treatment continuous pipe for hydrogen injection of an underground hydrogen storage library and a preparation method of the engineering seamless treatment continuous pipe. The preparation method of the engineering seamless treatment continuous pipe for hydrogen injection of the underground hydrogen storage library comprises the steps that a coiled plate is prepared; the rolled plate is longitudinally sheared, and a plurality of steel belts are obtained; the multiple steel strips are welded in a first welding mode, welding seams are protected through first inert gas, and butt joint steel strips are obtained; after edge milling is conducted on the butt-joint steel belt, bending forming is conducted through a row roller, welding is conducted in a second welding mode, and a welding seam is protected through second inert gas; adopting an I-shaped crevasse to carry out whole pipe welding forming on longitudinal seam welding, and carrying out bright solid solution heat treatment under the protection of argon through a solid solution heat treatment unit after welding is completed to obtain a pipe blank; and the pipe blank is coiled, hot extrusion is conducted on the pipe blank, and the engineering seamless treatment continuous pipe is obtained. According to the technical scheme, the consistency of the weld joint base metal structure of the continuous pipe can be guaranteed, and the durability of the continuous pipe is improved.

Description

Technical Field

[0001] The present application relates to the technical field of continuous pipe preparation, and in particular to an engineering seamless continuous pipe for hydrogen injection into an underground hydrogen storage reservoir and a preparation method thereof. Background Art

[0002] Coiled Tube (CT), also known as flexible oil pipe, has the characteristics of pressure operation and continuous lifting and lowering. The equipment is small in size, has a fast operation cycle and low cost. A single length can reach 10,000 meters. It can be deformed repeatedly and carry operating tools. It can be used for all types of operations in the fields of well repair, logging, drilling, and completion. It can also be used in onshore and offshore oil and gas gathering and transportation pipelines. It is an indispensable high-end oil pipe in today's oil industry.

[0003] Using coiled tubing instead of conventional oil pipes to inject hydrogen into underground hydrogen storage can solve the problem of corrosion near the casing coupling during hydrogen injection in conventional oil pipes, and can directly operate under pressure, which can fully meet the operating pressure for underground hydrogen storage, greatly saving operating costs; however, conventional coiled tubing is not resistant to hydrogen embrittlement, and hydrogen molecules easily enter the metal for enrichment, so hydrogen embrittlement cannot be avoided by simply using coiled tubing for hydrogen injection. In addition, since welding technology is required during the forming process, the weld area is a weak area of ​​the coiled tubing, and the presence of certain residual stress in the weld further increases the occurrence of hydrogen embrittlement.

[0004] At present, conventional oil pipe joints are prone to corrosion, resulting in poor wellbore sealing performance and hydrogen leakage. Conventional coiled tubing is not resistant to hydrogen embrittlement. The weak area of ​​the coiled tubing is the welding joint. The high temperature of the welding joint may cause water and hydrogen atoms to dissolve into the weld, causing problems such as hydrogen corrosion of the coiled tubing. Summary of the invention

[0005] This application aims to solve or improve the above technical problems.

[0006] To this end, the first purpose of the present application is to provide a method for preparing an engineering seamless continuous pipe for hydrogen injection into an underground hydrogen storage tank.

[0007] The second object of the present application is to provide an engineering seamless processed continuous pipe for hydrogen injection into an underground hydrogen storage tank.

[0008] To achieve the first purpose of the present application, the technical solution of the first aspect of the present application provides a method for preparing an engineering seamless continuous pipe for hydrogen injection in an underground hydrogen storage tank, comprising: preparing a coil; longitudinally shearing the coil to obtain a plurality of steel strips; welding the plurality of steel strips by a first welding method, and protecting the welds by a first inert gas to obtain a butt-jointed steel strip; milling the butt-jointed steel strips and then bending them into shape by rollers, welding them by a second welding method, and protecting the welds by a second inert gas; using an I-type rupture for longitudinal seam welding to form the entire pipe, and after welding, performing a bright solution heat treatment in a solution heat treatment unit under the protection of argon to obtain a tube blank; coiling the tube blank, and performing multiple hot extrusions on the tube blank to obtain an engineering seamless continuous pipe.

[0009] According to the method for preparing an engineering seamless continuous pipe for hydrogen injection in an underground hydrogen storage reservoir provided in the present application, a coil is first prepared. The coil is then longitudinally sheared to obtain a plurality of steel strips. The plurality of steel strips are welded by a first welding method, and the weld is protected by a first inert gas to obtain a butt-jointed steel strip. The butt-jointed steel strip is milled and then bent into shape by a row of rollers, and then welded by a second welding method, and the weld is protected by a second inert gas. The longitudinal seam welding is formed by welding the entire pipe with an I-type rupture. After welding is completed, the whole pipe is subjected to bright solution heat treatment under the protection of argon gas in a solution heat treatment unit to obtain a tube blank. After the tube blank is manufactured, the continuous pipe is coiled and transported to a hot extrusion equipment unit for hot extrusion of the weld to ensure that the weld is seamlessly treated, thereby obtaining an engineering seamless treated continuous pipe, which can ensure the consistency of the parent material structure of the continuous pipe weld and improve the durability of the continuous pipe.

[0010] It can be understood that considering the continuous tube seamless processing as hot extrusion forming, hot extrusion uses a transmission device to transmit the tube to the extrusion equipment, and hot extrudes the tube. Therefore, it is necessary to consider a certain amount of hot extrusion in the selection of plate thickness. The selection of extrusion amount mainly considers the crushing and growth of the weld structure at the welding position, and adheres to the overall quality of the pipe remaining unchanged, and is cut into steel strips of specified width by the longitudinal shearing unit.

[0011] In addition, the technical solution provided by this application may also have the following additional technical features:

[0012] In the above technical scheme, the preparation of the coil specifically includes: placing the raw materials into an electric furnace to complete melting and rough refining to obtain crude molten steel; transferring the crude molten steel into an argon oxygen decarburization AOD furnace, introducing an oxygen-argon mixed gas into the argon oxygen decarburization AOD furnace, and adjusting the ratio of oxygen and argon in the mixed gas according to the carbon content in the crude molten steel; when the carbon content of the crude molten steel reaches a preset carbon content, the crude molten steel is subjected to slag treatment.

[0013] In this technical solution, the coil is prepared by first putting the scrap steel and other raw materials into the electric furnace to complete the melting and rough refining, and then transferring the smelted molten steel into the argon oxygen decarburization AOD furnace, introducing a certain proportion of oxygen and argon mixed gas into the furnace, and continuously adjusting the proportion of oxygen and argon in the mixed gas according to the carbon content in the molten steel. When the carbon content reaches the steel grade requirement, the slag is removed. The full-process super electric furnace and clean argon oxygen decarburization AOD furnace smelting technology can achieve deep degassing, decarburization, desulfurization and dephosphorization.

[0014] In the above technical scheme, the preparation of the coil also includes: transferring the crude molten steel after the slag treatment into the ladle LF furnace for refining to obtain refined molten steel; when the composition and temperature of the refined molten steel reach the preset composition and preset temperature, transporting the refined molten steel to the continuous casting platform for casting to obtain an ingot; when the ingot is cooled, mechanically grinding the surface oxide scale of the ingot.

[0015] In this technical solution, the preparation of the coil also includes transferring the crude molten steel after the slag treatment into the ladle LF furnace for refining to obtain refined molten steel. When the composition and temperature of the refined molten steel reach the preset composition and preset temperature, the refined molten steel is transported to the continuous casting platform for casting to obtain an ingot. After the ingot is cooled, the surface oxide scale of the ingot is mechanically polished. The full-process super electric furnace, clean argon oxygen decarburization AOD furnace smelting technology and ladle LF refining process can achieve deep degassing, decarburization, desulfurization and dephosphorization.

[0016] In the above technical scheme, the crude molten steel after slagging treatment is transferred to the ladle LF furnace for refining to obtain refined molten steel, which specifically includes: adding reducing agent and slag-forming material according to the composition of the crude molten steel after slagging treatment to adjust and obtain refined molten steel.

[0017] In this technical solution, the crude molten steel after slagging treatment is transferred to the ladle LF furnace for refining to obtain refined molten steel. Specifically, reducing agent and slag-forming material are added according to the composition of the crude molten steel after slagging treatment to adjust and obtain refined molten steel.

[0018] In the above technical solution, the preparation of the coil also includes: placing the polished ingot into a continuous rolling mill for multiple hot rolling to obtain an initial coil, and performing online solution treatment on the initial coil at 1050°C-1100°C to obtain a rolled finished plate.

[0019] In this technical solution, the preparation of the coil also includes placing the polished ingot into a continuous rolling mill for multiple hot rolling to obtain an initial coil. The initial coil is subjected to online solution treatment at 1050°C-1100°C to obtain a rolled finished plate.

[0020] In the above technical solution, the preparation of the coiled plate also includes: pickling and phosphating the rolled finished plate, and coiling the rolled finished plate to obtain the coiled plate.

[0021] In this technical solution, the preparation of the coiled plate also includes pickling and phosphating the finished rolled plate, and coiling the finished rolled plate to obtain the coiled plate.

[0022] In the above technical solution, the reducing agent includes one of the following or a combination thereof: ferrosilicon, silicon chromium, and aluminum.

[0023] In this technical solution, the reducing agent includes ferrosilicon, silicon chromium and aluminum.

[0024] In the above technical solution, the slag-making material includes lime and / or fluorite.

[0025] In this technical solution, the slag-forming material includes lime or fluorite.

[0026] In the above technical scheme, the chemical composition of the rolled plate is as follows by mass percentage: C: ≤0.02%; Si: ≤0.7%; Mn: ≤2.0%; P: ≤0.009%; S: ≤0.003%; Cr: 16%-26%; Ni: 10%-30%; N: 0.05%-1.0%; Mo: 1.6%-3.0%, and the rest is Fe and unavoidable impurities.

[0027] In this technical solution, the chemical composition characteristics of the coil are low C, high Cr, high Ni, low Mo, low Mn and low nitrogen. The high Cr and high Ni chemical composition are the key to ensure that the coiled tube has high resistance to hydrogen environment. The selection of Cr and Ni content mainly depends on parameters such as hydrogen partial pressure and temperature in the hydrogen environment.

[0028] In the above technical solution, multiple steel strips are welded by a first welding method, and the weld is protected by a first inert gas to obtain a butt-jointed steel strip, which specifically includes: connecting multiple steel strips by a 40°-50° bevel method, and welding the multiple steel strips by the first welding method; protecting the weld by a first inert gas, and performing a 1050°-1100°C solid solution heat treatment on the butt weld; grinding and non-destructive testing are performed on the weld area to obtain a butt-jointed steel strip.

[0029] In this technical solution, multiple steel strips are welded by a first welding method, and the weld is protected by a first inert gas to obtain a butt-jointed steel strip. Specifically, laser welding, resistance spot welding, stir friction welding, plasma wire filling and other welding methods are adopted, and the weld is protected by an inert gas protection method such as helium and argon. The steel strips are connected by a 40°-50° bevel method, and the butt weld is solution heat treated at 1050℃-1100℃. The weld area is ground and non-destructively tested, and multiple steel strips are beveled, solution heat treated and ground to the target length.

[0030] In the above technical solution, the first welding method includes one of the following or a combination thereof: laser welding, resistance spot welding, stir friction welding, and plasma wire filling.

[0031] In this technical solution, the first welding method includes laser welding, resistance spot welding, friction stir welding, and plasma wire filling.

[0032] In the above technical solution, the first inert gas includes helium and / or argon.

[0033] In this technical solution, the first inert gas includes helium or argon.

[0034] In the above technical solution, the second welding method includes one of the following or a combination thereof: laser welding, carbon dioxide gas shielded welding, and plasma welding.

[0035] In this technical solution, the second welding method includes laser welding, carbon dioxide gas shielded welding, and plasma welding.

[0036] In the above technical solution, the second inert gas includes helium with a purity of 100%; and / or the second inert gas includes argon with a purity of ≥99.7% and nitrogen with a purity of 2%.

[0037] In this technical solution, the second inert gas includes helium with a purity of 100% or argon with a purity of ≥99.7% and nitrogen with a purity of 2%.

[0038] In the above technical solution, the heat treatment temperature of the bright solution heat treatment is 1050°C-1100°C.

[0039] In this technical solution, the heat treatment temperature of the bright solution heat treatment is 1050°C-1100°C.

[0040] In the above technical scheme, the tube billet is coiled and subjected to multiple hot extrusions to obtain an engineering seamless continuous tube, which specifically includes: the tube billet is transported by rollers adapted to the size of the tube billet and enters an online heat treatment furnace and hot extrusion equipment; the tube billet is subjected to multiple online heat treatments and hot extrusions to obtain an engineering seamless continuous tube, and the temperature of the online heat treatment needs to be greater than the sensitization range temperature of the material.

[0041] In this technical solution, the tube billet is coiled and subjected to multiple hot extrusions to obtain an engineering seamless continuous tube. Specifically, the tube billet is first extruded and transmitted through a row of rollers adapted to the size of the tube billet, and then enters an online heat treatment furnace for online heat treatment. Then, the tube billet after online heat treatment is subjected to multiple hot extrusions to obtain an engineering seamless continuous tube with a high surface finish. The high-performance seamless continuous tube for hydrogen injection in the hydrogen storage tank is processed by a multiple-pass hot extrusion process, and the continuous tube is creatively moved in a rear-drive manner. The lower pushing speed ensures that the thrust of the continuous tube is uniform during the hot extrusion process, and the uniform hot extrusion of the continuous tube ensures the consistency of the parent material structure of the continuous tube weld. The consistency of the whole coil and extrusion speed eliminates the slip and dislocation generated during the hot rolling and welding stretching process. Among them, the temperature of the online heat treatment is greater than the sensitization interval temperature of the material, and the specific temperature range is determined according to the specific material.

[0042] In the above technical scheme, the tube billet is subjected to multiple online heat treatments and hot extrusions to obtain an engineering seamless continuous tube, which specifically includes: online heat treatment of the tube billet; transferring the tube billet after the online heat treatment to a hot extrusion unit to hot extrude the tube segment of the tube billet; immediately cooling the tube segment of the tube billet after the hot extrusion is completed, and coiling the tube billet onto a large plate after cooling; reversing the hot extrusion transmission equipment to perform secondary hot extrusion on the tube billet to obtain an engineering seamless continuous tube.

[0043] In this technical solution, the tube billet undergoes multiple online heat treatments and hot extrusions to obtain an engineering seamless continuous tube. Specifically, the tube billet is first subjected to online heat treatment, and the tube billet after online heat treatment is transferred to the hot extrusion unit to hot extrude the tube segment of the tube billet. Then, after the hot extrusion is completed, the tube segment of the tube billet is water-cooled, and after cooling, the tube billet is coiled onto a large plate. Finally, the hot extrusion transmission equipment is reversed, and the tube billet is subjected to secondary hot extrusion to obtain a seamless continuous tube. The water cooling method ensures that the tube is quickly cooled from the austenite temperature region to room temperature after hot extrusion, effectively avoiding the generation of low-temperature precipitation phases, thereby further ensuring that the tube and weld have good hydrogen embrittlement resistance.

[0044] In the above technical solution, the transmission speed is less than or equal to 15 mm / s.

[0045] In this technical solution, the transmission speed is less than or equal to 15 mm / s.

[0046] In the above technical solution, the temperature of the online heat treatment is greater than or equal to 950°C.

[0047] In this technical solution, the temperature of the online heat treatment is greater than or equal to 950°C.

[0048] In order to achieve the second purpose of the present application, the technical solution of the second aspect of the present application provides an engineering seamless treated continuous pipe for hydrogen injection into an underground hydrogen storage reservoir, which is prepared by the preparation method of the engineering seamless treated continuous pipe for hydrogen injection into an underground hydrogen storage reservoir such as any technical solution in the first aspect of the present application, and therefore has the technical effects of any technical solution in the first aspect mentioned above, which will not be repeated here.

[0049] Additional aspects and advantages of the present application will become apparent in the following description or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0051] Figure 1 A schematic flow chart of the steps of a method for preparing an engineering seamless treated coiled pipe for hydrogen injection in an underground hydrogen storage tank according to an embodiment of the present application;

[0052] Figure 2 A schematic flow chart of the steps of a method for preparing an engineering seamless treated coiled pipe for hydrogen injection in an underground hydrogen storage tank according to an embodiment of the present application;

[0053] Figure 3 A schematic flow chart of the steps of a method for preparing an engineering seamless treated coiled pipe for hydrogen injection in an underground hydrogen storage tank according to an embodiment of the present application;

[0054] Figure 4 A schematic flow chart of the steps of a method for preparing an engineering seamless treated coiled pipe for hydrogen injection in an underground hydrogen storage tank according to an embodiment of the present application;

[0055] Figure 5 A schematic flow chart of the steps of a method for preparing an engineering seamless treated coiled pipe for hydrogen injection in an underground hydrogen storage tank according to an embodiment of the present application;

[0056] Figure 6 A schematic flow chart of the steps of a method for preparing an engineering seamless treated coiled pipe for hydrogen injection in an underground hydrogen storage tank according to an embodiment of the present application;

[0057] Figure 7 A schematic flow chart of the steps of a method for preparing an engineering seamless treated coiled pipe for hydrogen injection in an underground hydrogen storage tank according to an embodiment of the present application;

[0058] Figure 8 A schematic flow chart of the steps of a method for preparing an engineering seamless treated coiled pipe for hydrogen injection in an underground hydrogen storage tank according to an embodiment of the present application;

[0059] Fig. 9This is a schematic flow chart of the steps of a method for preparing an engineering seamless treated continuous pipe for hydrogen injection in an underground hydrogen storage reservoir according to an embodiment of the present application. DETAILED DESCRIPTION

[0060] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0061] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0062] Refer to the following Figures 1 to 9 The present application describes an engineered seamless continuous pipe for hydrogen injection in an underground hydrogen storage tank and a method for preparing the same in some embodiments.

[0063] like Figure 1 As shown, an embodiment of the first aspect of the present application provides a method for preparing an engineering seamless treated continuous pipe for hydrogen injection in an underground hydrogen storage reservoir, comprising the following steps:

[0064] Step S102: preparing a rolled plate;

[0065] Step S104: longitudinally shearing the coil to obtain a plurality of steel strips;

[0066] Step S106: welding the plurality of steel strips by a first welding method, and protecting the welds by a first inert gas to obtain butted steel strips;

[0067] Step S108: milling the edges of the butted steel strips, bending them into shape through rollers, welding them through a second welding method, and protecting the welds through a second inert gas;

[0068] Step S110: The longitudinal seam is welded by using an I-type rupture to weld the entire tube. After welding, the tube is passed through a solution heat treatment unit and subjected to bright solution heat treatment under the protection of argon gas to obtain a tube blank.

[0069] Step S112: coiling the tube blank and performing multiple hot extrusions on the tube blank to obtain an engineering seamless continuous tube.

[0070] According to the method for preparing an engineering seamless continuous pipe for hydrogen injection in an underground hydrogen storage reservoir provided in the present application, a coil is first prepared. The coil is then longitudinally sheared to obtain a plurality of steel strips. The plurality of steel strips are welded by a first welding method, and the weld is protected by a first inert gas to obtain a butt-jointed steel strip. The butt-jointed steel strip is milled and then bent into shape by a row of rollers, and then welded by a second welding method, and the weld is protected by a second inert gas. For the longitudinal seam welding, an I-type rupture is used to weld the entire pipe. After the welding is completed, the bright solution heat treatment is carried out by a solution heat treatment unit under the protection of argon gas to obtain a tube blank. After the tube blank is manufactured, the continuous pipe is coiled and transported to a hot extrusion equipment unit for hot extrusion of the weld to ensure that the weld is seamlessly treated to obtain a seamless continuous pipe, which can ensure the consistency of the parent material structure of the continuous pipe weld and improve the durability of the continuous pipe.

[0071] It can be understood that considering the continuous tube seamless processing as hot extrusion forming, the hot extrusion transmission device adopts a four-claw transmission device to transmit the tube to the extrusion equipment for hot extrusion. Therefore, it is necessary to consider a certain amount of hot extrusion in the selection of plate thickness. The selection of extrusion amount mainly considers the crushing and growth of the weld structure at the welding position, and adheres to the overall quality of the pipe remaining unchanged, and is cut into steel strips of specified width by the longitudinal shearing unit.

[0072] like Figure 2 As shown, according to a method for preparing an engineering seamless treated continuous pipe for hydrogen injection in an underground hydrogen storage reservoir according to an embodiment of the present application, a coil is prepared, which specifically includes the following steps:

[0073] Step S202: placing the raw materials into an electric furnace to complete melting and rough refining to obtain crude molten steel;

[0074] Step S204: transferring the crude molten steel into an argon oxygen decarburization AOD furnace, introducing an oxygen-argon mixed gas into the argon oxygen decarburization AOD furnace, and adjusting the ratio of oxygen and argon in the mixed gas according to the carbon content in the crude molten steel;

[0075] Step S206: When the carbon content of the crude molten steel reaches a preset carbon content, the crude molten steel is subjected to slag removal.

[0076] In this embodiment, the coil is prepared by first placing the scrap steel and other raw materials into an electric furnace to complete the melting and rough refining, then transferring the smelted molten steel into an argon oxygen decarburization AOD furnace, introducing a certain proportion of oxygen-argon mixed gas into the furnace, and continuously adjusting the proportion of oxygen-argon in the mixed gas according to the carbon content in the molten steel, and performing slag removal when the carbon content reaches the steel grade requirement. The full-process super electric furnace and clean argon oxygen decarburization AOD furnace smelting technology can achieve deep degassing, decarburization, desulfurization, and dephosphorization.

[0077] like Figure 3As shown, according to a method for preparing an engineering seamless treated continuous pipe for hydrogen injection in an underground hydrogen storage reservoir according to an embodiment of the present application, preparing a coiled plate also includes the following steps:

[0078] Step S302: transferring the slag-stripped molten steel into a ladle LF furnace for refining to obtain refined molten steel;

[0079] Step S304: when the composition and temperature of the refined molten steel reach the preset composition and preset temperature, the refined molten steel is transported to the continuous casting platform for casting to obtain an ingot;

[0080] Step S306: After the ingot is cooled, the surface oxide scale of the ingot is mechanically polished.

[0081] In this embodiment, the preparation of the coil also includes transferring the slag-stripped molten steel into a ladle LF furnace for refining to obtain refined molten steel. When the composition and temperature of the refined molten steel reach the preset composition and preset temperature, the refined molten steel is transported to the continuous casting platform for casting to obtain an ingot. After the ingot is cooled, the surface oxide scale of the ingot is mechanically polished. The full-process super electric furnace, clean argon oxygen decarburization AOD furnace smelting technology and ladle LF refining process can achieve deep degassing, decarburization, desulfurization and dephosphorization.

[0082] like Figure 4 As shown, according to a method for preparing an engineering seamless treated continuous pipe for hydrogen injection in an underground hydrogen storage reservoir according to an embodiment of the present application, the crude molten steel after slagging treatment is transferred to a ladle LF furnace for refining to obtain refined molten steel, which specifically includes the following steps:

[0083] Step S402: Add reducing agent and slag-forming material according to the composition of the crude molten steel after slagging treatment to adjust it and obtain refined molten steel.

[0084] In this embodiment, the crude molten steel after slagging treatment is transferred to the ladle LF furnace for refining to obtain refined molten steel, specifically, reducing agent and slag-forming material are added according to the composition of the crude molten steel after slagging treatment to adjust and obtain refined molten steel. Among them, the reducing agent includes ferrosilicon, silicon chromium, and aluminum. The slag-forming material includes lime or fluorite.

[0085] like Figure 5 As shown, according to a method for preparing an engineering seamless treated continuous pipe for hydrogen injection in an underground hydrogen storage reservoir according to an embodiment of the present application, preparing a coiled plate also includes the following steps:

[0086] Step S502: placing the polished ingot into a continuous rolling mill for multiple hot rollings to obtain an initial coil, and performing an online solid solution treatment at 1050° C.-1100° C. on the initial coil to obtain a rolled finished plate.

[0087] In this embodiment, preparing the coil further includes placing the polished ingot into a continuous rolling mill for multiple hot rolling to obtain an initial coil, and performing an online solid solution treatment at 1050° C. to 1100° C. to obtain a rolled finished plate.

[0088] like Figure 6 As shown, according to a method for preparing an engineering seamless treated continuous pipe for hydrogen injection in an underground hydrogen storage reservoir according to an embodiment of the present application, preparing a coiled plate also includes the following steps:

[0089] Step S602: pickling and phosphating the finished rolled plate, and coiling the finished rolled plate to obtain a coil.

[0090] In this embodiment, preparing the coiled plate further includes pickling and phosphating the rolled finished plate, and coiling the rolled finished plate to obtain the coiled plate.

[0091] In the above embodiment, the chemical composition of the coil is as follows by mass percentage: C: ≤0.02%; Si: ≤0.7%; Mn: ≤2.0%; P: ≤0.009%; S: ≤0.003%; Cr: 16%-26%; Ni: 10%-30%; N: 0.05%-1.0%; Mo: 1.6%-3.0%, and the rest is Fe and unavoidable impurities. It can be understood that the chemical composition characteristics of the coil are low C, high Cr, high Ni, low Mo, low Mn, and low nitrogen. The high Cr and high Ni chemical composition is the key to ensure that the coiled tube has a high resistance to hydrogen environment. The selection of Cr and Ni content mainly depends on the hydrogen partial pressure, temperature and other parameters in the hydrogen environment.

[0092] like Figure 7 As shown, according to a method for preparing an engineering seamless treated continuous pipe for hydrogen injection in an underground hydrogen storage reservoir according to an embodiment of the present application, a plurality of steel strips are welded by a first welding method, and the welds are protected by a first inert gas to obtain butt-jointed steel strips, which specifically includes the following steps:

[0093] Step S702: connecting the plurality of steel strips by a 40°-50° miter method, and welding the plurality of steel strips by a first welding method;

[0094] Step S704: protecting the weld by using a first inert gas, and performing a 1050° C.-1100° C. solid solution heat treatment on the butt weld;

[0095] Step S706: Grind and perform nondestructive testing on the weld area to obtain a butt-jointed steel strip.

[0096] In this embodiment, a plurality of steel strips are welded by a first welding method, and the weld is protected by a first inert gas to obtain a butt-jointed steel strip. Specifically, laser welding, resistance spot welding, stir friction welding, plasma wire filling and other welding methods are adopted, and the weld is protected by an inert gas protection method such as helium and argon. The steel strips are connected by a 40°-50° bevel method, and the butt weld is solution heat treated at 1050°C-1100°C. The weld area is ground and non-destructively tested, and the plurality of steel strips are beveled, solution heat treated and ground to a target length.

[0097] In some embodiments, the first welding method includes laser welding, resistance spot welding, stir friction welding, and plasma wire filling. The first inert gas includes helium or argon. The second welding method includes laser welding, carbon dioxide gas shielded welding, and plasma welding. The second inert gas includes 100% pure helium or 99.7% pure argon and 2% pure nitrogen.

[0098] In the above embodiment, the heat treatment temperature of the bright solution heat treatment is 1050°C-1100°C.

[0099] like Figure 8 As shown, according to a method for preparing an engineering seamless treated continuous tube for hydrogen injection in an underground hydrogen storage tank according to an embodiment of the present application, the tube blank is coiled and subjected to multiple hot extrusions to obtain the engineering seamless treated continuous tube, which specifically includes the following steps:

[0100] Step S802: The tube blank is transported by rollers adapted to the size of the tube blank and enters an online heat treatment furnace and a hot extrusion device;

[0101] Step S804: performing multiple online heat treatments and hot extrusions on the tube blank to obtain an engineering seamless treated continuous tube, wherein the temperature of the online heat treatment is greater than the sensitization interval temperature of the material.

[0102] In this embodiment, the tube billet is coiled and subjected to multiple hot extrusions to obtain an engineering seamless continuous tube. Specifically, the tube billet is first extruded and transmitted by a row of rollers adapted to the size of the tube billet, and then enters an online heat treatment furnace for online heat treatment. Then, the tube billet after online heat treatment is subjected to multiple hot extrusions to obtain a seamless continuous tube. The high-performance seamless continuous tube for hydrogen injection in the hydrogen storage tank is processed by a multiple-pass hot extrusion process, and the continuous tube is creatively moved in a rear-drive manner. The lower pushing speed ensures that the thrust of the continuous tube is uniform during the hot extrusion process, and the uniform hot extrusion of the continuous tube ensures the consistency of the parent material structure of the continuous tube weld. The consistency of the whole coil and extrusion speed eliminates the slip and dislocation generated during the hot rolling and welding stretching process. Among them, the temperature of the online heat treatment is greater than the sensitization interval temperature of the material, and the specific temperature range is determined according to the specific material.

[0103] like Fig. 9 As shown, according to a method for preparing an engineering seamless treated continuous tube for hydrogen injection in an underground hydrogen storage reservoir according to an embodiment of the present application, the tube blank is subjected to multiple online heat treatments and hot extrusions to obtain an engineering seamless treated continuous tube, which specifically includes the following steps:

[0104] Step S902: performing online heat treatment on the tube blank;

[0105] Step S904: transferring the tube blank after the online heat treatment to the hot extrusion unit to perform hot extrusion on the tube segment of the tube blank;

[0106] Step S906: After the hot extrusion is completed, the tube section of the tube blank is immediately cooled, and after cooling, the tube blank is coiled onto a large coil;

[0107] Step S908: Reverse the hot extrusion transmission equipment to perform secondary hot extrusion on the tube blank to obtain an engineering seamless processed continuous tube.

[0108] In this embodiment, the tube blank is subjected to multiple online heat treatments and hot extrusions to obtain an engineering seamless continuous tube. Specifically, the tube blank is first subjected to online heat treatment, and the tube blank after online heat treatment is transferred to a hot extrusion unit to perform hot extrusion on the tube segment of the tube blank. Then, after the hot extrusion is completed, the tube segment of the tube blank is water-cooled, and after cooling, the tube blank is coiled onto a large plate. Finally, the hot extrusion transmission device is reversed, and the tube blank is subjected to secondary hot extrusion to obtain a seamless continuous tube. The water cooling method ensures that the tube is quickly cooled from the austenite temperature region to room temperature after hot extrusion, effectively avoiding the generation of low-temperature precipitation phases, thereby further ensuring that the tube and weld have good hydrogen embrittlement resistance.

[0109] The transmission speed is less than or equal to 15 mm / s, and the temperature of the online heat treatment is greater than or equal to 950°C.

[0110] An embodiment of the second aspect of the present application provides an engineering seamless treated continuous pipe for hydrogen injection into an underground hydrogen storage reservoir, which is prepared by a preparation method of an engineering seamless treated continuous pipe for hydrogen injection into an underground hydrogen storage reservoir as in any embodiment of the first aspect above, and therefore has the technical effects of any embodiment of the first aspect above, which will not be repeated here.

[0111] According to a specific embodiment of the present application, the engineering seamless treatment continuous pipe for hydrogen injection in underground hydrogen storage tanks adopts a special hydrogen embrittlement resistant material, is formed into a continuous pipe by welding, and the finished continuous pipe oblique weld, straight weld, and parent material are subjected to weld uniformity treatment by hot extrusion to ensure the consistency of the weld and parent material structure. The chemical composition of the rolled plate is as follows by mass percentage: C: ≤0.02%; Si: ≤0.7%; Mn: ≤2.0%; P: ≤0.009%; S: ≤0.003%; Cr: 16-26%; Ni: 10-30%; N: 0.05-1.0%; Mo: 1.6-3.0%, and the rest is Fe and unavoidable impurities.

[0112] The above-mentioned underground hydrogen storage hydrogen injection engineering seamless processing coiled pipe comprises the following steps:

[0113] (1) Coil preparation: First, the scrap steel and other raw materials are placed in the EAF (electric furnace) to complete the melting and rough refining, and then the smelted molten steel is transferred to the argon oxygen decarburization AOD furnace, and a certain proportion of oxygen-argon mixed gas is introduced into the furnace, and the proportion of oxygen-argon in the mixed gas is continuously adjusted according to the carbon content in the molten steel. When the carbon content reaches the steel grade requirement, the slag is removed and finally enters the ladle LF furnace for refining. During the refining process, a certain amount of reducing agents such as ferrosilicon, silicon chromium, and aluminum and slag-forming materials such as lime and fluorite can be added according to the composition of the molten steel. When the composition and temperature meet the requirements, the molten steel is transported to the continuous casting platform for casting. After the ingot is cooled, the surface oxide scale of the ingot is mechanically polished; after polishing, it is placed in the continuous rolling unit for multiple hot rolling, and the coil is subjected to online solution treatment at a solution temperature of 1050℃-1100℃. After rolling, the coil is pickled and phosphated, and the rolled finished plate is coiled.

[0114] (2) Coil slitting and butt welding: Considering that the continuous tube seamless process is hot extrusion forming, the hot extrusion uses a transmission device to transmit the tube to the extrusion equipment for hot extrusion. Therefore, it is necessary to consider a certain amount of hot extrusion in the selection of plate thickness. The selection of extrusion amount mainly considers the crushing and growth of the weld structure at the welding position, and adheres to the overall quality of the tube remaining unchanged. It is cut into a steel strip of specified width by the slitting unit;

[0115] (3) Laser welding, resistance spot welding, friction stir welding, plasma wire filling and other welding methods are used, and the welds are protected by inert gas protection such as helium and argon. The steel strips are connected by 40°-50° bevel joint, and the butt welds are subjected to 1050℃-1100℃ solid solution heat treatment. The weld areas are ground and non-destructively tested. Multiple steel strips are beveled, solution heat treated and ground to the target length.

[0116] (3) Preparation of tube blanks: After the edge of the butt-jointed steel strip is milled, it is bent into shape by rollers and welded by laser welding, carbon dioxide gas shielded welding, plasma welding, etc. During the entire welding process, 100% pure helium or argon with a purity of ≥99.7% + 2% nitrogen is used for weld laser welding protection; longitudinal seam welding is butt-jointed by type I rupture. After welding, it is brightly solution-heat treated in a solution heat treatment unit under the protection of argon gas at a heat treatment temperature of 1050°C-1100°C. After the tube blank is manufactured, the continuous tube is coiled and transported to a hot extrusion equipment unit for hot extrusion of the weld to ensure that the weld is seamless.

[0117] (5) Hot extrusion process: The hot extrusion equipment uses rollers that are suitable for the size of the coiled tube to extrude and transport the coiled tube. The transmission speed is consistent with the coiling speed of the coiled tube finished tube coiling equipment. The coiled tube is driven by the rollers to move forward and then enters the online heat treatment furnace for online heat treatment. The heat treatment temperature is ≥ the austenite forming temperature. After passing through the online heat treatment furnace, the tube enters the hot extrusion unit for hot extrusion of the tube section. After the hot extrusion is completed, the tube section is water-cooled and coiled onto a large plate after cooling; the hot extrusion transmission equipment is reversed to perform two hot extrusions on the tube. After multiple extrusions, the multi-pass hot extrusion of the entire tube body of the coiled tube is completed to ensure the consistency of the weld, heat-affected zone, and parent material structure, so that the coiled tube is seamless. This process requires a low transmission speed (≤15 mm / s) to further eliminate vacancies and defects caused by the hot extrusion of the tube and ensure that the tube has good hydrogen embrittlement resistance.

[0118] The wall thickness of the seamless continuous pipe for hydrogen injection in underground hydrogen storage is 1.0-6.0mm, and the length is 100-8000m. It can be wound onto a reel with an appropriate core diameter for transportation and use.

[0119] Specifically, the chemical composition mass percentages of the plate are as follows: C: 0.02%; Si: 0.5%; Mn: 2%; P: 0.003%; S: 0.0001%; ​​Cr: 21.5%; Ni: 23.5%; Mo: 1.0%; N: 0.12%; the rest are Fe and unavoidable impurities.

[0120] 1. Coil preparation: First, the scrap steel and other raw materials are calculated according to the percentage of finished product elements, and put into EAF (electric furnace) to complete melting and rough refining. Then, the smelted 110t molten steel is transferred to the argon oxygen decarburization AOD furnace, and a certain proportion of oxygen-argon mixed gas is introduced into the furnace. The proportion of oxygen and argon in the mixed gas is continuously adjusted according to the carbon content in the molten steel. When the carbon content reaches the steel grade requirement, slag treatment is carried out, and finally the steel ladle LF furnace is entered for secondary refining. During the refining process, a certain amount of reducing agents such as ferrosilicon, silicon chromium, aluminum, and slag-forming materials such as lime and fluorite can be added according to the composition of the molten steel. When the composition and temperature meet the requirements, the molten steel is transported to the continuous casting platform for casting. After the ingot is cooled, the surface oxide scale of the ingot is mechanically polished; after polishing, it is placed in the continuous rolling unit for multiple hot rolling, and the coil is subjected to online solution treatment at a solution temperature of 1070°C. After rolling, the coil is pickled and phosphated, and the rolled finished plate is sawed and coiled.

[0121] 2. Slitting and extension of coiled plates:

[0122] Since the size of the final finished pipe is 63*4.0mm, the pipe injection length is 1500m, and since the extrusion process is internal and external hot extrusion, the welded pipe needs to leave a certain amount of extrusion for both the inner and outer diameters. The 4.8mm plate is used for welding and forming, and the size of the formed pipe is 63.4*4.8mm. According to the principle of volume conservation, 1258 meters of 63.4mm*4.8mm wall thickness continuous oil pipe is required. According to calculations, the continuous pipe needs to be 204mm wide for longitudinal shearing of the coiled plate. The coiled plate is longitudinally sheared with a longitudinal shear width of 204mm.

[0123] The plate is unrolled, the head is beveled at 45 degrees, the beveled plate is placed in a vacuum laser welding heat treatment device to perform laser butt joint on the beveled plate, and the butted plate is subjected to vacuum solution heat treatment and rapidly cooled using argon gas;

[0124] 3. Preparation of tube blank:

[0125] After the edge of the butt-jointed steel strip is milled, it is bent into shape by rollers, and the steel strip is welded into a tube blank by laser welding. Argon gas with a purity of ≥99.7% is used for gas protection during the straight seam welding process of the pipe.

[0126] 4. Heat treatment of the whole tube:

[0127] The whole tube heat treatment equipment is used to perform online solution heat treatment on the continuous tube. The solution heat treatment temperature is 1080°C and the solution time needs to be ≥1min.

[0128] 5. Tube hot extrusion process:

[0129] The Φ63.4×4.8mm continuous tube is transferred to the hot extrusion equipment by the overhead crane for hot extrusion. The tube is hot extruded at 1080℃. After the tube is unfolded, it directly enters the hot extrusion die under the action of the conveying roller. The Φ63.4×4.8mm continuous tube is pushed by the hot extrusion die with a fixed outer diameter of 63.2mm and an inner expansion head of 54.4mm. The hot extrusion speed is 8mm / s. -2 After extrusion, the diameter of the tube is 63.2mm and the wall thickness is 4.5mm. After the hot extrusion is completed, the conveying extrusion roller drives the extruded tube. After the first extrusion is completed, the direction of the transmission roller is changed, the hot extrusion die is replaced, and the continuous tube is subjected to a second hot extrusion. The external extrusion die used for the second hot extrusion is 63mm, and the internal expansion head is 55mm. The extrusion speed is 6mm / s. -2 .

[0130] 6. Main performance:

[0131] A high-performance seamless continuous pipe for hydrogen injection in an underground hydrogen storage tank prepared by the above method and a manufacturing method can withstand an internal pressure of ≥35MPa. The weld and the base material are in a 15Mpa hydrogen environment, and the base material and the weld are not sensitive to the hydrogen environment.

[0132] In summary, the beneficial effects of the embodiments of the present application are:

[0133] 1. Low C, high Cr, high Ni, low Mo, low Mn, low nitrogen. High Cr and high Ni chemical composition are the key to ensure that the coiled tube has high resistance to hydrogen environment.

[0134] 2. Adopt full-process ultra-EAF (electric furnace), clean argon oxygen decarburization AOD furnace smelting technology and ladle LF refining process to achieve deep degassing, decarburization, desulfurization and dephosphorization.

[0135] 3. The high-performance seamless continuous tube for hydrogen injection in the hydrogen storage tank is processed through a multi-pass hot extrusion process. The continuous tube is creatively moved in a rear-drive manner. The lower pushing speed ensures uniform thrust of the continuous tube during hot extrusion. The uniform hot extrusion of the continuous tube ensures the consistency of the parent material structure of the continuous tube weld. The consistency of the whole coil and extrusion speed eliminates the slip and dislocation generated during hot rolling and welding stretching.

[0136] 4. The water cooling method ensures that the pipe is quickly cooled from the austenite temperature area to room temperature after hot extrusion, effectively avoiding the generation of low-temperature precipitation phase, thereby further ensuring that the pipe and weld have good hydrogen embrittlement resistance.

[0137] In this application, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. Terms such as "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0138] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or module referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be understood as a limitation on the present application.

[0139] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0140] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for preparing an engineering seamless treated continuous pipe for hydrogen injection in an underground hydrogen storage reservoir, characterized in that: include: Preparation of coils; Slitting the coiled plate to obtain a plurality of steel strips; Welding the plurality of steel strips by a first welding method, and protecting the welds by a first inert gas, to obtain butted steel strips; The butted steel strips are milled and then bent into shape by rollers, welded by a second welding method, and the weld is protected by a second inert gas; The longitudinal seam welding adopts I-type rupture to weld the whole pipe. After welding, it is passed through the solution heat treatment unit and bright solution heat treatment is carried out under the protection of argon gas to obtain the pipe blank. The tube blank is coiled and subjected to multiple hot extrusions to obtain an engineering seamless continuous tube.

2. The method for preparing the engineering seamless treated coiled pipe for hydrogen injection in underground hydrogen storage according to claim 1, characterized in that: The preparation of the rolled plate specifically includes: Put the raw materials into an electric furnace to complete melting and rough refining to obtain crude molten steel; Transferring the crude molten steel into an argon oxygen decarburization AOD furnace, introducing an oxygen-argon mixed gas into the argon oxygen decarburization AOD furnace, and adjusting the ratio of oxygen and argon in the mixed gas according to the carbon content in the crude molten steel; When the carbon content of the crude molten steel reaches a preset carbon content, the crude molten steel is subjected to slag removal treatment.

3. The method for preparing the engineering seamless treated coiled pipe for hydrogen injection in underground hydrogen storage according to claim 2, characterized in that: The method of preparing the rolled plate further comprises: The crude molten steel after slagging treatment is transferred into a ladle LF furnace for refining to obtain refined molten steel; When the composition and temperature of the refined molten steel reach a preset composition and a preset temperature, the refined molten steel is transported to a continuous casting platform for casting to obtain an ingot; After the ingot is cooled, the surface oxide scale of the ingot is mechanically polished.

4. The method for preparing the engineering seamless treated coiled pipe for hydrogen injection in underground hydrogen storage according to claim 3, characterized in that: The step of transferring the crude molten steel after the slagging treatment into a ladle LF furnace for refining to obtain refined molten steel specifically comprises: According to the composition of the crude molten steel after slagging treatment, reducing agent and slag-forming material are added to adjust the composition to obtain refined molten steel.

5. The method for preparing the engineering seamless treated coiled pipe for hydrogen injection in underground hydrogen storage according to claim 3, characterized in that: The method of preparing the rolled plate further comprises: The polished ingot is placed in a continuous rolling mill for multiple hot rolling to obtain an initial coil, and the initial coil is subjected to an online solution treatment at 1050° C.-1100° C. to obtain a rolled finished plate.

6. The method for preparing the engineering seamless treated coiled pipe for hydrogen injection in underground hydrogen storage according to claim 5, characterized in that: The method of preparing the rolled plate further comprises: The rolled finished plate is pickled and phosphated, and the rolled finished plate is coiled to obtain a coil.

7. The method for preparing an engineering seamless treated coiled pipe for hydrogen injection in an underground hydrogen storage reservoir according to claim 4, characterized in that: The reducing agent includes one of the following or a combination thereof: ferrosilicon, silicon chromium, and aluminum.

8. The method for preparing the engineering seamless treated coiled pipe for hydrogen injection in underground hydrogen storage according to claim 4, characterized in that: The slag-forming material includes lime and / or fluorite.

9. The method for preparing an engineering seamless treated coiled pipe for hydrogen injection in an underground hydrogen storage according to any one of claims 1 to 8, characterized in that: The chemical composition of the rolled plate is as follows by mass percentage: C: ≤0.02%; Si: ≤0.7%; Mn: ≤2.0%; P：≤0.009％； S: ≤0.003%; Cr: 16%-26%; Ni: 10%-30%; N: 0.05%-1.0%; Mo: 1.6%-3.0%, and the rest is Fe and inevitable impurities.

10. The method for preparing an engineering seamless treated coiled pipe for hydrogen injection in an underground hydrogen storage according to any one of claims 1 to 8, characterized in that: The method of welding the plurality of steel strips by a first welding method and protecting the welds by a first inert gas to obtain butted steel strips specifically includes: Connecting the plurality of steel strips by a 40°-50° miter method, and welding the plurality of steel strips by a first welding method; The weld is protected by the first inert gas, and the butt weld is subjected to a 1050°C-1100°C solid solution heat treatment; The weld area is ground and non-destructively tested to obtain the butted steel strip.

11. The method for preparing an engineering seamless treated coiled pipe for hydrogen injection in an underground hydrogen storage according to any one of claims 1 to 8, characterized in that: The first welding method includes one of the following or a combination thereof: laser welding, resistance spot welding, stir friction welding, and plasma wire filling.

12. The method for preparing an engineering seamless treated coiled pipe for hydrogen injection in an underground hydrogen storage according to any one of claims 1 to 8, characterized in that: The first inert gas includes helium and / or argon.

13. The method for preparing an engineering seamless treated coiled pipe for hydrogen injection in an underground hydrogen storage according to any one of claims 1 to 8, characterized in that: The second welding method includes one of the following or a combination thereof: laser welding, carbon dioxide gas shielded welding, and plasma welding.

14. The method for preparing an engineering seamless treated coiled pipe for hydrogen injection in an underground hydrogen storage according to any one of claims 1 to 8, characterized in that: The second inert gas comprises 100% pure helium; and / or The second inert gas includes argon with a purity of ≥99.7% and nitrogen with a purity of 2%.

15. The method for preparing an engineering seamless treated coiled pipe for hydrogen injection in an underground hydrogen storage according to any one of claims 1 to 8, characterized in that: The heat treatment temperature of the bright solution heat treatment is 1050°C-1100°C.

16. The method for preparing an engineering seamless treated coiled pipe for hydrogen injection in an underground hydrogen storage according to any one of claims 1 to 8, characterized in that: The step of coiling the tube blank and performing multiple hot extrusion on the tube blank to obtain an engineering seamless continuous tube specifically includes: The tube blank is transported by rollers adapted to the size of the tube blank and enters an online heat treatment furnace and a hot extrusion device; The tube blank is subjected to multiple online heat treatments and hot extrusions to obtain an engineering seamless treated continuous tube, wherein the temperature of the online heat treatment is greater than the material sensitization temperature.

17. The method for preparing an engineering seamless treated coiled pipe for hydrogen injection in an underground hydrogen storage reservoir according to claim 16, characterized in that: The tube blank is subjected to multiple online heat treatments and hot extrusions to obtain an engineering seamless continuous tube, specifically comprising: Performing online heat treatment on the tube blank; The tube blank after online heat treatment is introduced into a hot extrusion unit to perform hot extrusion on the tube segment of the tube blank; After the hot extrusion is completed, the tube section of the tube blank is immediately cooled, and after cooling, the tube blank is coiled onto a large coil; The hot extrusion transmission device is reversed to perform secondary hot extrusion on the tube blank to obtain an engineering seamless continuous tube.

18. The method for preparing an engineering seamless treated coiled pipe for hydrogen injection in an underground hydrogen storage reservoir according to claim 16, characterized in that: The transmission speed is less than or equal to 15 mm / s.

19. The method for preparing an engineering seamless treated coiled pipe for hydrogen injection in an underground hydrogen storage reservoir according to claim 16, characterized in that: The temperature of the online heat treatment is greater than or equal to 950°C.

20. An engineering seamless treated coiled pipe for hydrogen injection in an underground hydrogen storage tank, characterized in that: The pipe is prepared by the method for preparing an engineering seamless continuous pipe for hydrogen injection in an underground hydrogen storage reservoir as described in any one of claims 1 to 19.

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