WO2019174093A1 - 一种同心连续油管在线连续生产制备方法 - Google Patents

一种同心连续油管在线连续生产制备方法 Download PDF

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Publication number
WO2019174093A1
WO2019174093A1 PCT/CN2018/082773 CN2018082773W WO2019174093A1 WO 2019174093 A1 WO2019174093 A1 WO 2019174093A1 CN 2018082773 W CN2018082773 W CN 2018082773W WO 2019174093 A1 WO2019174093 A1 WO 2019174093A1
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Prior art keywords
outer tube
coiled tubing
tube
welding
continuous production
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PCT/CN2018/082773
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English (en)
French (fr)
Inventor
蔡孝井
陈化顺
林旭
徐常富
王泰
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杰森能源技术有限公司
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Publication of WO2019174093A1 publication Critical patent/WO2019174093A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D23/00—Producing tubular articles
    • B29D23/001—Pipes; Pipe joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/36—Bending and joining, e.g. for making hollow articles
    • B29C53/38—Bending and joining, e.g. for making hollow articles by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges
    • B29C53/387—Bending and joining, e.g. for making hollow articles by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges the joining being done from the inside
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/36—Bending and joining, e.g. for making hollow articles
    • B29C53/38—Bending and joining, e.g. for making hollow articles by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges
    • B29C53/48—Bending and joining, e.g. for making hollow articles by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges for articles of indefinite length, i.e. bending a strip progressively
    • 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
    • E21B17/20—Flexible or articulated drilling pipes, e.g. flexible or articulated rods, pipes or cables

Definitions

  • the invention relates to the technical field of special coiled tubing devices for oil and gas exploration and development, and in particular to a method for online continuous production and preparation of concentric coiled tubing.
  • the coiled tubing differs from a conventional threaded tubing in that it is a single jointless tubing that is wound on a drum and can be continuously lowered or lifted up to several kilometers. Due to its low operating cost, simple time saving, safety and reliability, it is widely used in sand washing, well washing, logging, completion and drilling. With the deepening of oil and gas field exploitation, special working conditions such as low pressure and low permeability wells, coalbed methane wells and horizontal wells are increasing, which also puts higher requirements on coiled tubing devices and their operation technology.
  • Concentric coiled tubing with internal and external tube structure can form independent loop unit and circulation channel in the wellbore.
  • a negative pressure environment or independent pressure system unit can be formed and does not interfere with the wellbore environment.
  • This type of pipe string has good adaptability in special working conditions such as heavy oil wells, low pressure low permeability wells, horizontal wells, leaking wells and large displacement wells where conventional coiled tubing is difficult to function effectively.
  • concentric coiled tubing for horizontal well negative pressure sand washing can make the sand washing operation more effective and thorough, and carry out the drilling and grinding of the coalbed methane well to clear the plug, which can effectively protect the coal reservoir and utilize the separate circulation loop of the concentric coiled tubing, which can be very smooth. Eliminate the wellbore effluent and restore production.
  • the concentric coiled tubing operation technology belongs to the internationally advanced technology, and its main application is in Canada, Venezuela, the United States and Australia.
  • domestic researchers have also carried out many researches and explorations on concentric coiled tubing operation technology, and a number of patents on concentric coiled tubing operation technology have emerged.
  • the existing patents and literatures mostly refer to the research of the working technology, and there is no report on the process or preparation method for the concentric coiled tubing.
  • the object of the present invention is to overcome the deficiencies of the above conventional techniques, and to provide a method for on-line continuous production and preparation of concentric coiled tubing.
  • the inner tube is simultaneously produced in the outer tube production process. Penetrating into the outer tube (which is an in-line continuous production process, the outer tube welding is performed simultaneously with the inner tube penetration).
  • the method can effectively avoid the shortage of the traditional concentric coiled tubing production method, has low dependence on the site and operation, and does not require additional auxiliary heavy equipment, and has the advantages of simple process, high efficiency, low cost, safety and reliability.
  • the object of the present invention is achieved by the following technical measures: a method for on-line continuous production of concentric coiled tubing, which introduces the prepared continuous inner tube into the outer tube before the outer tube is crimped.
  • the inner tube is wound on the production drum and horizontally enters into the guiding frame through the pipe reel, the guiding frame is arranged on the upper part of the outer tube crimping unit, the number of guiding frames is several, and the inner tube passes through the guiding frame It enters the guide rail and is bent in the guide rail to extend horizontally into the outer tube before crimp forming.
  • the inner tube is welded tightly to the bottom of the outer tube (welding length 1m-2m), the inner tube penetration speed is adjusted to be the same as the outer tube welding forming speed, and the outer tube is formed. At the same time, the inner tube is driven through.
  • the outer tube welding is performed simultaneously with the inner tube penetration, and the outer tube welding forming method includes laser welding, plasma arc welding, argon arc welding and high frequency welding.
  • a preferred technical solution is to use high-frequency welding for the outer tube welding forming method in order to improve the welding efficiency and increase the life of the connecting pipe.
  • placing an impedance device in the outer tube welding section increases the inductive reactance of the current path in the tube.
  • the resistor is a fan shape
  • the resistor includes a sector housing
  • the housing is provided with a plurality of ferrite magnetic bars
  • the resistors are provided with cooling water pipes on both sides thereof.
  • the housing is made of a non-metallic material.
  • the material of the sector housing comprises polytetrafluoroethylene, epoxy resin, and glass fiber.
  • a special-shaped resistor is designed and fabricated, and the resistor is arranged in a sector section near the top of the outer tube, and the gap between the control resistor and the inner wall of the outer tube is about 2 mm, and the thickness of the resistor is about 10 mm to leave enough space. , let the inner tube pass through the lower part of the impeder.
  • the skin effect of the high-frequency current and the proximity are exerted, so that more energy is used for the heating of the welding section, and at the same time, the resistor is prevented from impeding the penetration of the inner tube, and the design is as follows.
  • the ferrite magnet is the core of the resistor.
  • the magnetic rod adopts a fancy structure, and 6-10 ferrite rods are arranged in the fan-shaped housing to reduce the induction heat of the housing.
  • the ferrite magnetic rod is protected by a non-metallic material (such as polytetrafluoroethylene, epoxy resin, glass fiber, etc.), and the cooling water is circulated through the cooling water pipe to make the ferrite magnetic rod It is sufficiently cooled to ensure that it does not exceed the Curie point temperature (about 769 ° C) which causes it to lose its magnetic properties.
  • a non-metallic material such as polytetrafluoroethylene, epoxy resin, glass fiber, etc.
  • a preferred technical solution is that after the outer tube is welded and formed, the weld is subjected to post-weld heat treatment by an induction heating device, and then the sizing unit is brought to the specified outer diameter size by the sizing unit, and finally subjected to the necessary whole tube heat treatment.
  • a preferred technical solution is to cut off the in-head portion by a shearing unit before the pipe is taken off, and the length of the cutting is completely removed from the welded fixing portion of the inner tube and the outer tube.
  • the method does not need to separately produce the inner tube and the outer tube, and then inserts the inner tube into the outer tube, but the outer tube welding and the inner tube penetration simultaneously, simplifying the realization process of the concentric coiled tubing, greatly improving Work efficiency
  • the inner tube is penetrated during the outer tube production process, and there is no need to worry about the fixing and rebounding of the coiled tubing, and the operation process is more safe and reliable;
  • the inner tube In the outer tube manufacturing process, the inner tube is penetrated. Compared with the traditional process, it only has the manufacturing cost of the inner and outer tubes, which can save a huge amount of tube pipeging costs, and reduce the production cost of the concentric coiled tubing by more than 25%.
  • Figure 1 is a schematic view showing the structure of a concentric coiled tubing.
  • Figure 2 is a schematic view showing the structure of the inner tube penetrating during the outer tube crimp forming process.
  • Fig. 3 is a structural schematic view showing the mounting position of the profiled impeder after the outer tube is crimped.
  • FIG. 4 is a schematic structural view of a structural diagram of a profiled resistor.
  • a concentric coiled tubing is continuously produced in-line, and the prepared continuous inner tube 1 is introduced into the outer tube 2 before the outer tube 2 is crimped.
  • the inner tube 1 is wound on the production drum and horizontally enters into the guiding frame 3 through the pipe reel.
  • the guiding frame 3 is disposed on the upper part of the outer tube 2 crimping unit, and the number of the guiding frames 3 is several, and the inner tube 1 passes through the guiding frame. 3 enters the guide curved rail 4, and after being bent in the guide curved rail 4, horizontally projects into the outer tube 2 before the crimp forming.
  • the inner tube 1 is inserted into the outer tube 2, the inner tube 1 is welded to the bottom of the outer tube 2, and the welding length is 1 m-2 m.
  • the outer tube 2 is welded and formed by high frequency welding.
  • the outer tube 2 welding section places the resistor 5 to increase the inductive reactance of the current path in the tube.
  • the resistor 5 is in the shape of a fan.
  • the resistor 5 includes a sector housing 6.
  • the housing 6 is provided with a plurality of ferrite rods 7.
  • the longitudinal section of the ferrite rod 7 is made of flowers.
  • the shape of the magnetic rod can increase the shape of the surface of the magnetic rod, and the heat dissipation effect can be improved.
  • the two sides of the resistor 5 are provided with a cooling water pipe 8, and the sector housing 6 is made of a non-metal material.
  • the material of the sector housing 6 includes polytetrafluoroethylene, epoxy resin, and glass fiber.
  • the weld is subjected to post-weld heat treatment by an induction heating device, and then passed through the sizing unit so that the outer tube 2 reaches the specified outer diameter size, and finally subjected to the necessary whole tube heat treatment.
  • the head portion is cut by the shearing unit, and the length of the cut is completely removed from the welded fixed portion of the inner pipe 1 and the outer pipe 2.
  • a specific embodiment of a CT80 steel grade inner tube 1 of 4500 m length 25.4 mm*1.9 mm size is inserted into a CT80 steel grade outer tube 2 of a corresponding length of 50.8 mm * 2.8 mm.
  • the prepared inner tube 1 (25.4 mm * 1.9 mm) is wound on a production drum, which is horizontally introduced into the guide frame 3 through the pipe reel, and enters the guide curved rail 4 through the guide frame 3 (curvature radius 2.5 m), after two bendings in the guide curved rail 4, the inner tube 1 is horizontally extended into the outer tube 2 (50.8 mm * 2.8 mm) before the crimp forming. After the inner tube 1 is inserted into the outer tube 2, the inner tube 1 is welded to the bottom of the outer tube 2, and the welding length is 1 m.
  • the tube 1 can be continuously inserted into the outer tube 2.
  • the outer tube 2 weld welding welding machine power 350 kW
  • the inner tube 1 is passed through the lower portion of the resistor 5, and smoothly passes through the high frequency induction welding section (the resistor 5 is placed close to In the sector of the top of the outer tube 2, the gap between the control resistor 5 and the inner wall of the outer tube 2 is about 2 mm, and the thickness of the resistor 5 is about 10 mm.
  • the welded joint is subjected to post-weld heat treatment by induction heating equipment, and then passed through the sizing unit, so that the outer tube 2 reaches the outer diameter size requirement of 50.8 ⁇ 0.25 mm, and after the whole tube heat treatment, the unit is cut by the shearing unit.
  • the head portion was cut off (cut length 5 m), and finally a concentric coiled tubing with 50.8 mm outer tube 2 and 25.4 mm inner tube 1 was obtained.
  • a specific embodiment of a CT90 steel grade inner tube 1 of 5000 m length 25.4 mm * 2.1 mm size is inserted into a CT90 steel grade outer tube 2 of a corresponding length of 50.8 mm * 2.8 mm.
  • the prepared inner tube 1 (25.4 mm * 2.1 mm) is wound on a production drum, which is horizontally introduced into the guide frame 3 through the pipe reel, and enters the guide curved rail 4 through the guide frame 3 (curvature radius 2.5 m), after two bendings in the guide curved rail 4, the inner tube 1 is horizontally extended into the outer tube 2 (50.8 mm * 2.8 mm) before the crimp forming. After the inner tube 1 is inserted into the outer tube 2, the inner tube 1 is welded to the bottom of the outer tube 2, and the welding length is 1 m.
  • the tube 1 can be continuously inserted into the outer tube 2.
  • the outer tube 2 weld welding welding machine power 310 kW
  • the inner tube 1 is passed through the lower portion of the resistor 5, and smoothly passes through the high frequency induction welding section (the resistor 5 is arranged close to In the sector of the top of the outer tube 2, the gap between the control resistor 5 and the inner wall of the outer tube 2 is about 2 mm, and the thickness of the resistor 5 is about 10 mm.
  • the welded joint is subjected to post-weld heat treatment by induction heating equipment, and then passed through the sizing unit, so that the outer tube 2 reaches the outer diameter size requirement of 50.8 ⁇ 0.25 mm, and after the whole tube heat treatment, the unit is cut by the shearing unit.
  • the head portion was cut off (cut length 5 m), and finally a concentric coiled tubing with 50.8 mm outer tube 2 and 25.4 mm inner tube 1 was obtained.
  • the prepared inner tube 1 (31.8 mm * 2.4 mm) is wound on a production drum, which is horizontally introduced into the guide frame 3 through the pipe reel, and enters the guide curved rail 4 through the guide frame 3 (curvature radius 3 m) After two bending in the guide curved rail 4, the inner tube 1 is horizontally extended into the outer tube 2 (60.3 mm * 2.8 mm) before the crimp forming. After the inner tube 1 is inserted into the outer tube 2, the inner tube 1 is welded and attached to the bottom of the outer tube 2, and the welding length is 1.5 m.
  • the tube 1 can be continuously inserted into the outer tube 2.
  • the outer tube 2 weld welding welding machine power 300 kW is completed by the designed profile resistor 5, and the inner tube 1 is passed through the lower portion of the resistor 5, and smoothly passes through the high frequency induction welding section (the resistor 5 is arranged close to In the sector of the top of the outer tube 2, the gap between the control resistor 5 and the inner wall of the outer tube 2 is about 2 mm, and the thickness of the resistor 5 is about 10 mm.
  • the weld is subjected to post-weld heat treatment by induction heating equipment, and then passed through the sizing unit, so that the outer tube 2 reaches the outer diameter requirement of 60.3 ⁇ 0.25 mm, and after the heat treatment of the whole tube, the head is cut by the shearing unit. Partial excision (cut length 5m) finally resulted in a concentric coiled tubing with 60.3mm outer tube 2 and 38.1mm inner tube 1.

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  • Mechanical Engineering (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
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Abstract

本发明提供了一种同心连续油管在线连续生产制备方法，在外管卷曲成型前将已制备好的整盘连续内管导入到外管中。内管缠绕在生产滚筒上通过倒管器水平进入到导向机架中，导向机架设置在外管卷曲机组上部，导向机架的数目为若干台，内管经过导向机架进入导向曲轨中，在导向曲轨中经过弯曲后，水平伸入到卷曲成型前的外管中。本发明可有效避免传统同心连续油管生产方法的不足，对场地及操作的依赖程度低，也不需要额外的辅助重型设备，实现过程简单、效率高、成本低且安全可靠。

Description

一种同心连续油管在线连续生产制备方法 技术领域
本发明涉及油气勘探、开发用特种连续油管装置技术领域，具体地说，是涉及一种同心连续油管在线连续生产制备方法。
背景技术
连续油管不同于常规螺纹连接的油管，其是一种缠绕在滚筒上，可连续下井或起出的单根长达数千米的无接头油管。由于其作业成本低、简单省时、安全可靠等优越性能，而被广泛应用于冲砂、洗井、测井、完井及钻井等多个领域。随着油、气田开采的不断深入，低压低渗井、煤层气井、水平井等特殊工况不断增多，这也对连续油管装置及其作业技术提出了更高的要求。
具有内外管结构的同心连续油管，可在井筒中形成独立的回路单元和循环通道，通过与各种井下工具组合，能够形成负压环境或独立的压力系统单元，且与井筒环境互不干扰。该类管柱在常规连续油管难以有效发挥作用的稠油井、低压低渗井、水平井、漏失井和大位移井等特殊工况中具有良好的适应性。利用同心连续油管进行水平井负压冲砂，可使冲砂作业更加的有效彻底，进行煤层气井钻磨疏通解堵，可有效保护煤储层，利用同心连续油管单独的循环回路，可以很顺利的将井筒积液排除，恢复产量。
同心连续油管作业技术属于国际上较为先进的技术，其主要应用在加拿大、委内瑞拉、美国及澳大利亚等国。近年来，国内学者也相继开展了许多关于同心连续油管作业技术的研究、探索，并涌现出了一批关于同心连续油管作业技术的专利。然而，现有专利及文献多是关于作业技术的研究，而未见针对同心连续油管实现工艺或制备方法的报道。
目前，国内尚未有同心连续油管产品推出。在北美，该产品的实现方案为，于户外足够宽阔的场地上，依靠吊车等重型设备将长达数千米的大管径连续油管(外管)完全拉直、铺展开，然后依靠钢丝绳索及重型设备将相应长度的小管径连续油管(内管)慢慢牵引穿入到外管中。该方案先单独生产出长达数千米的内管及外管，然后在线下，通过机械设备将内管穿入到外管中。其对操作 场地及操作人员的要求较高，实现过程较为复杂，且每次操作均需要额外租赁辅助重型设备，经济成本较高；将长达数千米的连续油管完全铺展开，固定较为困难且容易回弹，因而存在较大的安全风险。
发明内容
本发明的目的在于克服上述传统技术的不足之处，提供一种同心连续油管在线连续生产制备方法，通过对连续油管生产设备的改进，依靠连续油管生产线，在外管生产过程中，同时将内管穿入到外管中(其是一种在线连续生产过程，外管焊接与内管穿入同时进行)。该方法可有效避免传统同心连续油管生产方法的不足，对场地及操作的依赖程度低，也不需要额外的辅助重型设备，实现过程简单、效率高、成本低且安全可靠。
本发明的目的是通过以下技术措施达到的：一种同心连续油管在线连续生产制备方法，在外管卷曲成型前将已制备好的整盘连续内管导入到外管中。
一种优选技术方案，内管缠绕在生产滚筒上通过倒管器水平进入到导向机架中，导向机架设置在外管卷曲机组上部，导向机架的数目为若干台，内管经过导向机架进入导向曲轨中，在导向曲轨中经过弯曲后，水平伸入到卷曲成型前的外管中。
一种优选技术方案，内管伸入到外管中以后，将内管焊接贴紧在外管底部(焊接长度1m-2m),调整内管穿入速度和外管焊接成型速度相同，外管成型过程中同时带动内管穿入。
一种优选技术方案，外管焊接与内管穿入同时进行，外管焊接成型的方式包括激光焊接、等离子弧焊接、氩弧焊接及高频焊接。
一种优选技术方案，外管焊接成型的方式选用高频焊，以便提升焊接效率、增加连管寿命。
一种优选技术方案，外管焊接区段放置阻抗器增加管内电流通道的感抗。
一种优选技术方案，所述阻抗器为扇形，所述阻抗器包括扇形壳体，所述壳体内设有若干个铁氧体磁棒，所述阻抗器两侧设有冷却水管，所述扇形壳体为非金属材料制成。
一种优选技术方案，所述扇形壳体的材料包括聚四氟乙烯、环氧树脂、玻璃纤维。
在管材的焊接中，无论是高频电阻焊还是高频感应焊都有无用的电流围绕着管子内表面流动，这种电流对焊接结合面的加热不做贡献，造成热量的大量散失、电源热效率低，甚至在设备给定的输入功率下(450KW以内)钢带边缘会因加热不足而难以焊合。因此需要在油管焊接区段放置阻抗器以增加管内电流通道的感抗，使更多的能量用到焊接区结合面的加热上。传统的阻抗器一般呈圆形并和待焊管材同心放置，其与管材内壁的间隙仅为6mm-15mm，因此，采用传统的连续油管高频焊接方式，内管根本无法从外管的焊接区段穿过。
为解决上述问题，设计制作异型阻抗器，将阻抗器布置在靠近外管顶部的扇形区段内，控制阻抗器与外管内壁的间隙约2mm、阻抗器厚度约10mm，以留有足够的空间，使内管从阻抗器下部穿过。
为增加管内电流通道的感抗，发挥高频电流的集肤效应及邻近相应，使更多的能量用到焊接区段的加热上，同时又不至使阻抗器阻碍内管穿入，设计如上述所述阻抗器。铁氧体磁棒是阻抗器的核心原件，为增加磁棒表面积、提高散热效果，磁棒采用花式结构，6-10个铁氧体磁棒排列在扇形壳体内，为减少壳体感应受热、保护铁氧体磁棒，扇形壳体采用非金属材料制作(如聚四氟乙烯、环氧树脂、玻璃纤维等)，通过冷却水管往扇形壳体内通循环冷却水，使铁氧体磁棒得到充分冷却，确保其不超过使其丧失磁性的居里点温度(约769℃)。
一种优选技术方案，外管焊接成型后通过感应加热设备对焊缝进行焊后热处理，然后经过定径机组使得外管达到所规定的外径尺寸，最后经过必要的整管热处理。
一种优选技术方案，收管前通过剪切机组将入头部分切除，切除长度完全去除内管与外管的焊接固定部分。
由于采用了上述技术方案，与现有技术相比，本发明的优点是：
该方法不需要先单独生产出内管和外管，然后再将内管穿入到外管中，而是外管焊接与内管穿入同时进行，简化了同心连续油管实现工序，大幅度提升了作业效率；
区别于传统工艺方式，其通过连续油管生产线，在外管生产过程中将内管穿入，不必依赖空旷的户外场地及额外的辅助重型设备，将长达数千米的连管 拉直、铺展开再穿入内管，穿管过程更加的灵活且易于操作；
依靠连续油管生产线及其辅助装置，在外管生产过程中将内管穿入，不必担心连续油管的固定及回弹问题，作业过程更加的安全可靠；
在外管制造过程中将内管穿入，相比传统工艺方式，其仅存在内、外管的制造成本，可节省巨额的管穿管费用，使得同心连续油管生产成本降低25％以上。
下面结合附图和具体实施方式对本发明作进一步说明。
附图说明
附图1是同心连续油管的结构示意图。
附图2是内管在外管卷曲成型过程中穿入的结构示意图。
附图3是外管卷曲成型后异型阻抗器安装位置的结构示意图。
附图4是异型阻抗器结构图的结构示意图。
其中，1-内管，2-外管，3-导向机架，4-导向曲轨，5-阻抗器，6-壳体，7-铁氧体磁棒，8-冷却水管。
具体实施方式
如附图1-4所示，一种同心连续油管在线连续生产制备方法，在外管2卷曲成型前将已制备好的整盘连续内管1导入到外管2中。内管1缠绕在生产滚筒上通过倒管器水平进入到导向机架3中，导向机架3设置在外管2卷曲机组上部，导向机架3的数目为若干台，内管1经过导向机架3进入导向曲轨4中，在导向曲轨4中经过弯曲后，水平伸入到卷曲成型前的外管2中。内管1伸入到外管2中以后，将内管1焊接贴紧在外管2底部，焊接长度为1m-2m。
作为优选，外管2焊接成型的方式选用高频焊。外管2焊接区段放置阻抗器5以增加管内电流通道的感抗。所述阻抗器5为扇形，所述阻抗器5包括扇形壳体6，所述壳体6内设有若干个铁氧体磁棒7，所述铁氧体磁棒7的纵向截面做成花状等能够增加磁棒表面积的形状，可以提高散热效果，所述阻抗器5两侧设有冷却水管8，所述扇形壳体6为非金属材料制成。所述扇形壳体6的材料包括聚四氟乙烯、环氧树脂、玻璃纤维。
外管2焊接后通过感应加热设备对焊缝进行焊后热处理，然后经过定径机 组，使得外管2达到所规定的外径尺寸，最后经过必要的整管热处理。收管前通过剪切机组将入头部分切除，切除长度完全去除内管1与外管2的焊接固定部分。
实施例1：
将4500m长25.4mm*1.9mm规格的CT80钢级内管1穿入相应长度50.8mm*2.8mm规格CT80钢级外管2中的具体实施例。
将已制备好的内管1(25.4mm*1.9mm)缠绕在生产滚筒上，其通过倒管器水平进入到导向机架3中，经过导向机架3进入导向曲轨4中(曲率半径2.5m)，在导向曲轨4中经过两次弯曲后，内管1水平伸入到卷曲成型前的外管2(50.8mm*2.8mm)中。内管1伸入到外管2中以后，将内管1焊接贴紧在外管2底部，焊接长度1m。调整内管1生产滚筒及倒管器，使得内管1穿入外管2的速度和外管2高频感应焊接生产速度(20m/min)相匹配，随着外管2生产的进行，内管1便可以连续穿入到外管2中。通过所设计的异型阻抗器5完成外管2焊缝焊接(焊机功率350KW)，并使内管1从阻抗器5下部穿过，顺利通过高频感应焊接区段(阻抗器5布置在靠近外管2顶部的扇形区段内，控制阻抗器5与外管2内壁的间隙约为2mm、阻抗器5厚度约10mm)。外管2焊接后通过感应加热设备对焊缝进行焊后热处理，然后经过定径机组，使得外管2达到50.8±0.25mm的外径尺寸要求，经过整管热处理后，通过剪切机组将入头部分切除(切除长度5m)，最终得到由50.8mm外管2与25.4mm内管1相配合的同心连续油管。
实施例2：
将5000m长25.4mm*2.1mm规格的CT90钢级内管1穿入相应长度50.8mm*2.8mm规格CT90钢级外管2中的具体实施例。
将已制备好的内管1(25.4mm*2.1mm)缠绕在生产滚筒上，其通过倒管器水平进入到导向机架3中，经过导向机架3进入导向曲轨4中(曲率半径2.5m)，在导向曲轨4中经过两次弯曲后，内管1水平伸入到卷曲成型前的外管2(50.8mm*2.8mm)中。内管1伸入到外管2中以后，将内管1焊接贴紧在外管2底部，焊接长度1m。调整内管1生产滚筒及倒管器，使得内管1穿入外管2的 速度和外管2高频感应焊接生产速度(15m/min)相匹配，随着外管2生产的进行，内管1便可以连续穿入到外管2中。通过所设计的异型阻抗器5完成外管2焊缝焊接(焊机功率310KW)，并使内管1从阻抗器5下部穿过，顺利通过高频感应焊接区段(阻抗器5布置在靠近外管2顶部的扇形区段内，控制阻抗器5与外管2内壁的间隙约为2mm、阻抗器5厚度约10mm)。外管2焊接后通过感应加热设备对焊缝进行焊后热处理，然后经过定径机组，使得外管2达到50.8±0.25mm的外径尺寸要求，经过整管热处理后，通过剪切机组将入头部分切除(切除长度5m)，最终得到由50.8mm外管2与25.4mm内管1相配合的同心连续油管。
实施例3：
将3600m长31.8mm*2.4mm规格的CT80钢级内管1穿入相应长度60.3mm*2.8mm规格CT80钢级外管2中的具体实施例。
将已制备好的内管1(31.8mm*2.4mm)缠绕在生产滚筒上，其通过倒管器水平进入到导向机架3中，经过导向机架3进入导向曲轨4中(曲率半径3m)，在导向曲轨4中经过两次弯曲后，内管1水平伸入到卷曲成型前的外管2(60.3mm*2.8mm)中。内管1伸入到外管2中以后，将内管1焊接贴紧在外管2底部，焊接长度1.5m。调整内管1生产滚筒及倒管器，使得内管1穿入外管2的速度和外管2高频感应焊接生产速度(13m/min)相匹配，随着外管2生产的进行，内管1便可以连续穿入到外管2中。通过所设计的异型阻抗器5完成外管2焊缝焊接(焊机功率300KW)，并使内管1从阻抗器5下部穿过，顺利通过高频感应焊接区段(阻抗器5布置在靠近外管2顶部的扇形区段内，控制阻抗器5与外管2内壁的间隙约为2mm、阻抗器5厚度约10mm)。外管2焊接后通过感应加热设备对焊缝进行焊后热处理，然后经过定径机组，使得外管2达到60.3±0.25mm外径尺寸要求，经过整管热处理后，通过剪切机组将入头部分切除(切除长度5m)，最终得到由60.3mm外管2与38.1mm内管1相配合的同心连续油管。

Claims (9)

  1. 一种同心连续油管在线连续生产制备方法，其特征在于：在外管卷曲成型前将已制备好的整盘连续内管导入到外管中。
  2. 根据权利要求1所述的一种同心连续油管在线连续生产制备方法，其特征在于：内管缠绕在生产滚筒上通过倒管器水平进入到导向机架中，导向机架设置在外管卷曲机组上部，导向机架的数目为若干台，内管经过导向机架进入导向曲轨中，在导向曲轨中经过弯曲后，水平伸入到卷曲成型前的外管中。
  3. 根据权利要求2所述的一种同心连续油管在线连续生产制备方法，其特征在于：内管伸入到外管中以后，将内管焊接贴紧在外管底部，焊接长度为1m-2m。
  4. 根据权利要求3所述的一种同心连续油管在线连续生产制备方法，其特征在于：外管焊接与内管穿入同时进行，外管焊接成型方式包括激光焊接、等离子弧焊接、氩弧焊接及高频焊接。
  5. 根据权利要求3所述的一种同心连续油管在线连续生产制备方法，其特征在于：外管成型采用高频焊接。
  6. 根据权利要求5所述的一种同心连续油管在线连续生产制备方法，其特征在于：外管焊接区段放置阻抗器增加管内电流通道的感抗。
  7. 根据权利要求6所述的一种同心连续油管在线连续生产制备方法，其特征在于：所述阻抗器为扇形，所述阻抗器包括扇形壳体，所述壳体内设有若干个铁氧体磁棒，所述阻抗器两侧设有冷却水管，所述扇形壳体为非金属材料制成。
  8. 根据权利要求7所述的一种同心连续油管在线连续生产制备方法，其特征在于：所述扇形壳体的材料包括聚四氟乙烯、环氧树脂、玻璃纤维。
  9. 根据权利要求3-8任一项所述的一种同心连续油管在线连续生产制备方法，其特征在于：外管焊接成型后通过感应加热设备对焊缝进行焊后热处理，然后经过定径机组使得外管达到所规定的外径尺寸，最后经过必要的整管热处理。
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