WO2023124754A1 - 连续油管的非焊接式修复方法 - Google Patents

连续油管的非焊接式修复方法 Download PDF

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Publication number
WO2023124754A1
WO2023124754A1 PCT/CN2022/135955 CN2022135955W WO2023124754A1 WO 2023124754 A1 WO2023124754 A1 WO 2023124754A1 CN 2022135955 W CN2022135955 W CN 2022135955W WO 2023124754 A1 WO2023124754 A1 WO 2023124754A1
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Prior art keywords
pipe section
connecting pipe
coiled tubing
pipe
repair method
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PCT/CN2022/135955
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English (en)
French (fr)
Inventor
刘永刚
尹成先
刘强
张朋举
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Tubular Goods Research Institute of CNPC
Xi'an Sanhuan Petroleum Material Technology Co Ltd
China National Petroleum Corp
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Tubular Goods Research Institute of CNPC
Xi'an Sanhuan Petroleum Material Technology Co Ltd
China National Petroleum Corp
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Publication of WO2023124754A1 publication Critical patent/WO2023124754A1/zh
Anticipated expiration legal-status Critical
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
    • 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
    • E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
    • E21B29/02—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground by explosives or by thermal or chemical means
    • 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
    • E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
    • E21B29/10—Reconditioning of well casings, e.g. straightening
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/20—Hydro energy

Definitions

  • the invention relates to the field of production oil wells, in particular to a non-welding repair method for coiled tubing.
  • Coiled tubing In the drilling process of oil and gas exploration and development, coiled tubing is widely used in drilling and completion operations such as fracturing and sand washing.
  • Coiled tubing is a pipe made of low-carbon alloy steel with good flexibility, also known as flexible tubing.
  • a coil of coiled tubing is several kilometers long. It can replace conventional tubing for many operations.
  • the coiled tubing operation equipment has the characteristics of pressure operation and continuous lifting. The equipment is small in size, fast in operation cycle and low in cost.
  • the traditional welding repair method Since the coiled tubing is integrally formed by a single pipe, when the pipe is partially damaged or broken during use, the traditional welding repair method has many procedures and high requirements, and different pipe materials need to use different welding wires and welds. Quality is often difficult to assure. At the same time, when the coiled tubing is made of alloy materials or composite materials with poor weldability, it is more difficult to repair by welding. In addition, open flame operations (including welding) are strictly prohibited during on-site construction of oil well operations. When the coiled tubing breaks, the traditional welding repair method cannot meet the requirements of on-site repair.
  • the purpose of the present invention is to provide a non-welded repair method for coiled tubing to solve the repair problem of coiled tubing in various complicated states.
  • the present invention provides a non-welding repair method for coiled tubing, wherein the coiled tubing includes a first pipe section and a second pipe section, and the non-weld repair method for coiled tubing includes:
  • a first connecting pipe sleeved outside the first pipe section and the second pipe section and a connecting pipe inserted into the first pipe section and the second pipe section are arranged.
  • the second connecting pipe, the first connecting pipe and the second connecting pipe are made of shape memory alloy, the first connecting pipe is in a state of radial expansion, and the second connecting pipe is in a state of radial contraction;
  • the inner diameter and outer diameter of the first pipe section and the second pipe section are respectively the same, and the inner diameter of the first connecting pipe in a radially expanded state is larger than the outer diameter of the first pipe section by 0.3mm- 0.5 mm, the outer diameter of the second connecting pipe in a radially contracted state is 0.3 mm-0.5 mm smaller than the inner diameter of the first pipe section.
  • the inner diameter of the first connecting pipe restored to shape is 0.2mm-0.4mm smaller than the outer diameter of the first pipe section, and the outer diameter of the second connecting pipe restored to shape is smaller than the outer diameter of the first pipe section
  • the inner diameter is 0.2mm-0.4mm larger.
  • teeth are provided on the inner peripheral surface of the first connecting pipe, and teeth are provided on the outer peripheral surface of the second connecting pipe.
  • the tooth portion on the first connecting pipe includes a first tooth portion located at the first pipe section and a second tooth portion located at the second pipe section, the top end of the first tooth portion and the The top ends of the second tooth portion are inclined towards each other
  • the tooth portion on the second connecting pipe includes a third tooth portion located at the first pipe section and a fourth tooth portion located at the second pipe section, so Top ends of the third tooth portion and the fourth tooth portion are inclined toward each other.
  • the tooth tip width of the tooth portion is 1mm-2mm
  • the tooth root width is 2mm-3mm
  • the tooth groove depth is 5%-10% of the wall thickness.
  • two rectangular grooves with a depth of 0.2-0.4 mm and a width of 0.4-0.6 mm are provided on the top surface of the tooth portion.
  • the non-welding repair method of the coiled tubing includes: in S1, filling the joint between the first pipe section and the second pipe section with metal glue.
  • the ends of the first pipe section and the second pipe section are flattened, and a bevel is processed at the joint of the first pipe section and the second pipe section.
  • the heating temperature is 50°-65°
  • the holding time is 35min-50min.
  • the shape memory alloy is a nickel-titanium shape memory alloy.
  • the present invention provides a non-welded repair method for coiled tubing, wherein the coiled tubing includes a first pipe section and a second pipe section, and the non-welded repair method for coiled tubing includes:
  • a first connecting pipe sleeved outside the first pipe section and the second pipe section and a connecting pipe inserted into the first pipe section and the second pipe section are arranged.
  • the second connecting pipe, the first connecting pipe and the second connecting pipe are made of shape memory alloy, the first connecting pipe is in a state of radial expansion, and the second connecting pipe is in a state of radial contraction;
  • the inner peripheral surface of the first connecting pipe is provided with teeth
  • the outer peripheral surface of the second connecting pipe is provided with teeth
  • the teeth on the first connecting pipe include The first tooth part at the place and the second tooth part at the second pipe section, the top end of the first tooth part and the top end of the second tooth part are inclined towards each other, the tooth on the second connecting pipe
  • the portion includes a third tooth portion at the first pipe section and a fourth tooth portion at the second pipe section, tips of the third tooth portion and the fourth tooth portion are inclined toward each other.
  • the inner diameter and outer diameter of the first pipe section and the second pipe section are respectively the same.
  • the inner diameter of the first connecting pipe in a radially expanded state is 0.3mm-0.5mm larger than the outer diameter of the first pipe section.
  • the outer diameter of the second connecting pipe in a radially contracted state is 0.3mm-0.5mm smaller than the inner diameter of the first pipe section.
  • the inner diameter of the restored first connecting pipe is 0.2mm-0.4mm smaller than the outer diameter of the first pipe section.
  • the outer diameter of the restored second connecting pipe is 0.2mm-0.4mm larger than the inner diameter of the first pipe section.
  • the tooth tip width of the tooth portion is 1mm-2mm.
  • two rectangular grooves with a depth of 0.2-0.4 mm and a width of 0.4-0.6 mm are provided on the top surface of the tooth portion.
  • the tooth root width of the teeth is 2mm-3mm.
  • the depth of the grooves of the teeth is 5%-10% of the wall thickness.
  • the non-welding repair method of the coiled tubing includes: in S1, filling the joint between the first pipe section and the second pipe section with metal glue.
  • the ends of the first pipe section and the second pipe section are flattened, and a bevel is processed at the joint of the first pipe section and the second pipe section.
  • the heating temperature is 50°-65°.
  • the holding time is 35 minutes to 50 minutes.
  • the first connecting pipe is made of nickel-titanium shape memory alloy.
  • the second connecting pipe is made of nickel-titanium shape memory alloy.
  • the connecting pipe made of shape memory alloy can realize the sealed connection between two pipe sections, has a simple structure, does not require large-scale welding equipment, is convenient for construction, has high reliability, and can effectively realize the reuse of coiled tubing. It is not only suitable for coiled tubing made of conventional metals, but also for coiled tubing made of non-metallic, composite metal, and corrosion-resistant alloys that are difficult to weld, and for repairing coiled tubing on site by the well crew.
  • Fig. 1 is a structural schematic diagram of the coiled tubing described in the embodiment of the present invention during the repair process
  • Fig. 2 is a partial sectional view of the first connecting pipe according to the embodiment of the present invention.
  • Fig. 3 is a partial cross-sectional view of a second connecting pipe according to an embodiment of the present invention.
  • Fig. 4 is a schematic structural view of the tooth part according to the embodiment of the present invention.
  • the present invention provides a non-welding repair method for coiled tubing, wherein the coiled tubing includes a first pipe section 1 and a second pipe section 2, and the non-welding repair method for coiled tubing includes:
  • the non-welding repair method of coiled tubing is aimed at the coiled tubing broken into two pipe sections, that is, to realize the connection between the first pipe section 1 and the second pipe section 2, and to ensure the sealing of the joint.
  • the first connecting pipe 3 is sleeved at the joint, and the second connecting pipe 4 is inserted into the joint, that is, the first connecting pipe 3 is located between the first pipe section 1 and the second pipe section.
  • the second connecting pipe 4 is located inside the first pipe section 1 and the second pipe section 2, wherein the first connecting pipe 3 and the second connecting pipe 4 are made of shape memory alloy respectively, and the first connecting pipe 3 In the state of radial expansion, the second connecting pipe 4 is in the state of radial contraction.
  • the first connecting pipe 3 and the second connecting pipe 4 By heating the first connecting pipe 3 and the second connecting pipe 4 to the transformation temperature (the temperature at which the shape memory alloy returns to its original shape), the first connecting pipe 3 and the second connecting pipe 4 recover their shape, which makes the inner diameter of the first connecting pipe 3 decrease, so that it fits more closely on the outer peripheral surfaces of the first pipe section 1 and the second pipe section 2, similarly, the outer diameter of the second connecting pipe 4 increases, so that it fits more closely on the first pipe section 1 and the second pipe section
  • the inner peripheral surface of the pipe section 2 , the first connecting pipe 3 and the second connecting pipe 4 form a seal with the first pipe section 1 and the second pipe section 2 respectively, so as to realize the sealed connection between the first pipe section 1 and the second pipe section 2 .
  • the first connecting pipe 3 shrinks from the outside to the inside
  • the second connecting pipe 4 expands from the inside to the outside, and can be bidirectionally squeezed from the outside and inside of the first pipe section 1 and the second pipe section 2, so that it can be connected with
  • the first pipe section 1 and the second pipe section 2 are in close contact to realize sealing.
  • connection performance and sealing performance of the coiled tubing at the joint can be well guaranteed.
  • the coiled tubing can be reused through the repair method, which saves the cost.
  • the connecting pipe made of shape memory alloy can realize the sealed connection between two pipe sections. It is suitable for coiled tubing made of conventional metal materials, non-metallic, composite metal, coiled tubing made of corrosion-resistant alloys with high welding difficulty, and coiled tubing repair operations on site by the well team.
  • the inner diameter and outer diameter of the first pipe section 1 and the second pipe section 2 are respectively the same, and the inner diameter of the first connecting pipe 3 in the radially expanded state is 0.3 larger than the outer diameter of the first pipe section 1 mm-0.5mm, the outer diameter of the second connecting pipe 4 in the radially contracted state is smaller than the inner diameter of the first pipe section 1 by 0.3mm-0.5mm.
  • the first pipe section 1 and the second pipe section 2 may be formed by accidental disconnection of the same coiled tubing, or different coiled tubing of the same specification and steel grade, with the same inner diameter and outer diameter.
  • the inner diameter of the first connecting pipe 3 is larger than the outer diameter of the coiled tubing, so that the first connecting pipe 3 can be easily sleeved at the seam of the coiled tubing, and the outer diameter of the second connecting pipe 4 is smaller than the inner diameter of the coiled tubing, so that the second The connecting pipe 4 can be easily inserted into the seam of the coiled tubing.
  • the inner diameter of the first connecting pipe 3 restored to shape is 0.2mm-0.4mm smaller than the outer diameter of the first pipe section 1, and the outer diameter of the second connecting pipe 4 restored to shape is smaller than the outer diameter of the first pipe section 1. 1.
  • the inner diameter is 0.2mm-0.4mm larger.
  • the outer diameter of the second connecting pipe 4 The diameter is increased, and its outer diameter is larger than that of the first pipe section 1 and the second pipe section 2 to achieve an interference fit, which not only realizes the butt joint of the first pipe section 1 and the second pipe section 2, but also ensures the sealing of the joint.
  • the inner peripheral surface of the first connecting pipe 3 is provided with teeth
  • the outer peripheral surface of the second connecting pipe 4 is provided with teeth.
  • the design of the tooth part one is to reduce the surface contact state between the first connecting pipe 3 and the outer peripheral surfaces of the first pipe section 1 and the second pipe section 2, form multiple relatively independent contact areas, increase the contact effect, and improve the overall contact surface
  • the independent tooth tops can form independent sealing contact surfaces, thereby improving the sealing performance of the entire contact surface.
  • the tooth portion on the first connecting pipe 3 includes a first tooth portion 31 located at the first pipe segment 1 and a second tooth portion 31 located at the second pipe segment 2 .
  • the tooth portion 32, the top end of the first tooth portion 31 and the top end of the second tooth portion 32 are inclined toward each other, and the tooth portion on the second connecting pipe 4 includes a third tooth portion located at the first pipe section 1.
  • the tooth portion 41 and the fourth tooth portion 42 located at the second pipe section 2 , the top ends of the third tooth portion 41 and the fourth tooth portion 42 are inclined towards each other.
  • the teeth at the first pipe section 1 are the first teeth 31, and the teeth at the second pipe section 2 are the second teeth. part 32, the top of the tooth part is inclined relative to the bottom, and its inclination direction is that the first tooth part 31 and the second tooth part 32 are inclined towards each other; similarly, the second connecting pipe 4 is provided with a third tooth part 41 and The fourth tooth portion 42 , and the tips of the third tooth portion 41 and the fourth tooth portion 42 are inclined toward each other.
  • the inclination direction of the first tooth portion 31 is opposite to the direction in which the first pipe section 1 disengages from the first connecting pipe 3 , and the first tooth portion 31 obliquely exerts force on the first pipe section 1 to prevent the first pipe section 1 from disengaging from the first connecting pipe 3 .
  • the first connecting pipe 3 is disengaged
  • the second tooth portion 32 , the third tooth portion 41 , and the fourth tooth portion 42 are similar, and will not be described again here. It can be seen that the tooth structure adopts the tooth structure with the inclined angle of the tension surface, which can effectively increase the stability of the tooth part under tensile load and improve the tensile bearing capacity.
  • Sleeve on the first pipe section 1 and the second pipe section 2 and insert the second connecting pipe 4 into the first pipe section 1 and the second pipe section 2 .
  • the tooth tip width of the tooth part is 1mm-2mm
  • the tooth root width is 2mm-3mm
  • the depth of the tooth groove is 5%-10% of the wall thickness.
  • the width of the top (tooth) of the first tooth portion 31 is smaller than the width of the bottom (root)
  • the side of the first tooth portion 31 towards the second tooth portion 32 is perpendicular to the side of the first connecting pipe 3.
  • There is a small angle in the section in the direction of the central axis that is, the angle at which the first tooth portion 31 is inclined toward the second tooth portion 32, and the side surface of the second tooth portion 32 facing away from the second tooth portion 32 is also an inclined surface, which is perpendicular to the
  • the included angle of the section in the direction of the central axis is larger.
  • two rectangular grooves with a depth of 0.2-0.4 mm and a width of 0.4-0.6 mm are provided on the top surface of the tooth portion.
  • two rectangular grooves 311 with a depth of 0.2-0.4 mm and a width of 0.4-0.6 mm are provided on the top surface of the first tooth portion 31 .
  • the arrangement of the rectangular shallow groove helps to further increase the contact static friction force between the first connecting pipe 3 and the first pipe section 1 , and improve the sealing performance and connection strength.
  • the top surfaces of the second tooth portion 32 , the third tooth portion 41 and the fourth tooth portion 42 are all provided with a rectangular groove similar to the rectangular groove 311 .
  • the non-welding repair method of the coiled tubing includes: in S1, filling the joint of the first pipe section 1 and the second pipe section 2 with metal glue.
  • the metal glue can bond the first pipe section 1 and the second pipe section 2, and the metal glue can be an AB type glue, that is, two different glues are mixed to bond objects.
  • the second connecting pipe 4 may be partially inserted into one of the first pipe section 1 and the second pipe section 2 (for example, the part having the third tooth portion 31 ), and the first connecting pipe 3 is completely sleeved.
  • first pipe section 1 or the second pipe section 2 On the first pipe section 1 or the second pipe section 2, insert the second connecting pipe 4 into the other, so that the first pipe section 1 and the second pipe section 2 are butted, then fill the joint with metal glue, and then slide the first connecting pipe 3, so that the first tooth portion 31 is located at the first pipe section 1 and the second tooth portion 32 is located at the second pipe section 2 .
  • the ends of the first pipe section 1 and the second pipe section 2 are flattened, and grooves are processed at the joints of the first pipe section 1 and the second pipe section 2 .
  • a bevel is formed between the end faces of the first pipe section 1 and the second pipe section 2 to allow a proper amount of metal glue to be filled.
  • the heating temperature is 50°-65°, and the holding time is 35min-50min.
  • the heating device 5 can be coated on the outside of the first connecting pipe 3 to realize the heating of the first connecting pipe 3 and the second connecting pipe 4, the heating temperature can be above the transition temperature, and it needs to be kept warm for a period of time , so that the first connecting pipe 3 and the second connecting pipe 4 return to their original shape within a sufficiently long heating time.
  • the shape memory alloy is a nickel-titanium shape memory alloy.
  • the transformation temperature of the nickel-titanium shape memory alloy is about 50°, which is relatively low, and the first connecting pipe 3 and the second connecting pipe 4 can be heated to this temperature more easily by a heating device, which is more convenient for operation.

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Abstract

公开了一种连续油管的非焊接式修复方法，连续油管包括第一管段（1）和第二管段（2），连续油管的非焊接式修复方法包括：S1、在第一管段和第二管段的接缝处设置第一连接管（3）和第二连接管（4），第一连接管和第二连接管由形状记忆合金制成且均处于变形状态；S2、加热第一连接管和第二连接管以恢复形状。形状记忆合金制成的连接管可以实现两个管段之间的密封连接，结构简单，不需要大型焊接设备，便于施工，可靠性高，可以有效地实现油管的再利用。该方法不仅适用于常规金属材质的连续油管，也适用于非金属、复合金属、焊接难度高的耐蚀合金材质的连续油管以及井队现场对连续油管的修复作业。

Description

连续油管的非焊接式修复方法
相关申请的交叉引用
本申请要求2021年12月31日提交的中国专利申请202111670388.2的权益，该申请的内容通过引用被合并于本文。
技术领域
本发明涉及开采油井领域，具体地涉及一种连续油管的非焊接式修复方法。
背景技术
在油气勘探开发中的钻井作业过程中，连续油管被广泛应用于压裂、冲砂等钻、完井作业。连续油管是用低碳合金钢制作的管材，有很好的挠性，又称挠性油管，一卷连续油管长几千米。可以代替常规油管进行很多作业，连续油管作业设备具有带压作业、连续起下的特点，设备体积小，作业周期快，成本低。
由于连续油管是由一根管子整体形成，当管子在使用过程中出现局部损伤或断裂失效时，传统的焊接式修复方式程序多，要求高，且不同的管材需要采用不同的焊丝，焊缝质量往往难以保证。同时，当连续油管采用焊接性能较差的合金材料或复合材料时，采用焊接方式进行修复的难度更大。此外，油井作业现场施工时，严禁明火作业(包括焊接)，当连续油管发生断裂时，传统的焊接式修复方式不能满足 现场修复的要求。
发明内容
本发明的目的是提供一种连续油管的非焊接式修复方法，以解决连续油管在多种复杂状态下的修复问题。
为了实现上述目的，本发明一方面提供一种连续油管的非焊接式修复方法，其中，所述连续油管包括第一管段和第二管段，连续油管的非焊接式修复方法包括：
S1、在第一管段和第二管段的接缝处设置套设在所述第一管段和所述第二管段外部的第一连接管和插入所述第一管段和所述第二管段内部的第二连接管，所述第一连接管和所述第二连接管由形状记忆合金制成，所述第一连接管处于径向膨胀状态，所述第二连接管处于径向收缩状态；
S2、加热所述第一连接管和所述第二连接管至转变温度，所述第一连接管恢复形状且所述第一连接管的内周面与所述第一管段的外周面和所述第二管段的外周面密封贴合，所述第二连接管恢复形状且所述第二连接管的外周面与所述第一管段的内周面和所述第二管段的内周面密封贴合。
可选择的，所述第一管段和所述第二管段的内径和外径分别相同，处于径向膨胀状态的所述第一连接管的内径比所述第一管段的外径大0.3mm-0.5mm，处于径向收缩状态的所述第二连接管的外径比所述第一管段的内径小0.3mm-0.5mm。
可选择的，恢复形状的所述第一连接管的内径比所述第一管段的外径小0.2mm-0.4mm，恢复形状的所述第二连接管的外径比所述第一管段的内径大0.2mm-0.4mm。
可选择的，所述第一连接管的内周面上设置有齿部，所述第二连接管的外周面上设置有齿部。
可选择的，所述第一连接管上的齿部包括位于所述第一管段处的第一齿部和位于所述第二管段处的第二齿部，所述第一齿部的顶端和所述第二齿部的顶端朝向彼此倾斜，所述第二连接管上的齿部包括位于所述第一管段处的第三齿部和位于所述第二管段处的第四齿部，所述第三齿部的顶端和所述第四齿部的顶端朝向彼此倾斜。
可选择的，所述齿部的齿顶宽度为1mm-2mm，齿根宽度为2mm-3mm，齿槽的深度为壁厚的5％-10％。
可选择的，所述齿部的顶面设有2条深度为0.2-0.4mm，宽度为0.4～0.6mm的矩形凹槽。
可选择的，连续油管的非焊接式修复方法包括：在S1中，在所述第一管段和所述第二管段的接缝处填充金属胶。
可选择的，在填充金属胶之前，对所述第一管段和所述第二管段进行端部平整，在所述第一管段和所述第二管段的接缝处加工出坡口。
可选择的，加热温度为50°～65°，保温时间为35min～50min。
可选择的，所述形状记忆合金为镍钛形状记忆合金。
另一方面，本发明提供了一种连续油管的非焊接式修复方法，其中，所述连续油管包括第一管段和第二管段，连续油管的非焊接式修 复方法包括：
S1、在第一管段和第二管段的接缝处设置套设在所述第一管段和所述第二管段外部的第一连接管和插入所述第一管段和所述第二管段内部的第二连接管，所述第一连接管和所述第二连接管由形状记忆合金制成，所述第一连接管处于径向膨胀状态，所述第二连接管处于径向收缩状态；
S2、加热所述第一连接管和所述第二连接管至转变温度，所述第一连接管恢复形状且所述第一连接管的内周面与所述第一管段的外周面和所述第二管段的外周面密封贴合，所述第二连接管恢复形状且所述第二连接管的外周面与所述第一管段的内周面和所述第二管段的内周面密封贴合；
其中，所述第一连接管的内周面上设置有齿部，所述第二连接管的外周面上设置有齿部，所述第一连接管上的齿部包括位于所述第一管段处的第一齿部和位于所述第二管段处的第二齿部，所述第一齿部的顶端和所述第二齿部的顶端朝向彼此倾斜，所述第二连接管上的齿部包括位于所述第一管段处的第三齿部和位于所述第二管段处的第四齿部，所述第三齿部的顶端和所述第四齿部的顶端朝向彼此倾斜。
可选择的，所述第一管段和所述第二管段的内径和外径分别相同。
可选择的，处于径向膨胀状态的所述第一连接管的内径比所述第一管段的外径大0.3mm-0.5mm。
可选择的，处于径向收缩状态的所述第二连接管的外径比所述第一管段的内径小0.3mm-0.5mm。
可选择的，恢复形状的所述第一连接管的内径比所述第一管段的外径小0.2mm-0.4mm。
可选择的，恢复形状的所述第二连接管的外径比所述第一管段的内径大0.2mm-0.4mm。
可选择的，所述齿部的齿顶宽度为1mm-2mm。
可选择的，所述齿部的顶面设有2条深度为0.2-0.4mm，宽度为0.4～0.6mm的矩形凹槽。
可选择的，所述齿部的齿根宽度为2mm-3mm。
可选择的，所述齿部的齿槽的深度为壁厚的5％-10％。
可选择的，连续油管的非焊接式修复方法包括：在S1中，在所述第一管段和所述第二管段的接缝处填充金属胶。
可选择的，在填充金属胶之前，对所述第一管段和所述第二管段进行端部平整，在所述第一管段和所述第二管段的接缝处加工出坡口。
可选择的，加热温度为50°～65°。
可选择的，保温时间为35min～50min。
可选择的，所述第一连接管为镍钛形状记忆合金制成。
可选择的，所述第二连接管为镍钛形状记忆合金制成。
通过上述技术方案，形状记忆合金制成的连接管可以实现两个管段之间的密封连接，结构简单，不需要大型焊接设备，便于施工，可靠性高，可以有效地实现连续油管的再利用。不仅适用于常规金属材质的连续油管，也适用于非金属、复合金属、焊接难度高的耐蚀合金材质的连续油管以及井队现场对连续油管的修复作业。
附图说明
图1是本发明实施方式所述的连续油管在修复过程中的结构示意图；
图2是本发明实施方式所述的第一连接管的部分剖视图；
图3是本发明实施方式所述的第二连接管的部分剖视图；
图4是本发明实施方式所述的齿部的结构示意图。
附图标记说明
1   第一管段          2   第二管段
3   第一连接管        4   第二连接管
5   加热装置          6   金属胶
31  第一齿部          32  第二齿部
41  第三齿部          42  第四齿部
311 矩形凹槽
具体实施方式
以下结合附图对本发明的具体实施方式进行详细说明。应当理解的是，此处所描述的具体实施方式仅用于说明和解释本发明，并不用于限制本发明。
本发明提供了一种连续油管的非焊接式修复方法，其中，所述连续油管包括第一管段1和第二管段2，连续油管的非焊接式修复方法包括：
S1、在第一管段1和第二管段2的接缝处设置套设在所述第一管 段1和所述第二管段2外部的第一连接管3和插入所述第一管段1和所述第二管段2内部的第二连接管4，所述第一连接管3和所述第二连接管4由形状记忆合金制成，所述第一连接管3处于径向膨胀状态，所述第二连接管4处于径向收缩状态；
S2、加热所述第一连接管3和所述第二连接管4至转变温度，所述第一连接管3恢复形状且所述第一连接管3的内周面与所述第一管段1的外周面和所述第二管段2的外周面密封贴合，所述第二连接管4恢复形状且所述第二连接管4的外周面与所述第一管段1的内周面和所述第二管段2的内周面密封贴合。
连续油管的非焊接式修复方法针对断为两个管段的连续油管，即实现第一管段1和第二管段2的连接，并且保证连接处的密封性。
将第一管段1和第二管段2对接后，将第一连接管3套设在连接处，并将第二连接管4插入到连接处，即第一连接管3位于第一管段1和第二管段2的外部，第二连接管4位于第一管段1和第二管段2的内部，其中，第一连接管3和第二连接管4分别由形状记忆合金制成，第一连接管3处于径向膨胀状态，第二连接管4处于径向收缩状态。
通过加热第一连接管3和第二连接管4达到转变温度(形状记忆合金恢复原来形状的温度)，第一连接管3和第二连接管4恢复形状，这使得第一连接管3的内径减小，从而更紧密地贴合于第一管段1和第二管段2的外周面，类似的，第二连接管4的外径增加，从而更紧密地贴合于第一管段1和第二管段2的内周面，第一连接管3和第二 连接管4分别与第一管段1和第二管段2形成密封，从而实现第一管段1和第二管段2的密封连接。特别的，恢复形状后，第一连接管3从外向内收缩，第二连接管4从内向外扩张，可以分别从第一管段1和第二管段2的外部和内部双向挤压，从而可以与第一管段1和第二管段2紧密接触，实现密封。
关于第一连接管3的膨胀和第二连接管4的收缩，这里是指壁厚直径的膨胀和收缩，特别是第一连接管3内径的增加，第二连接管4外径的减小，当恢复原来的形状后，第一连接管3的内径减小以贴合于第一管段1和第二管段2，第二连接管4的外径增加以贴合于第一管段1和第二管段2。
通过形状记忆合金制成的连接管的连接，连续油管在连接处的连接性能和密封性能可以得到很好地保障。通过修复方法可以实现连续油管的再利用，节省了成本。
本方案中，形状记忆合金制成的连接管可以实现两个管段之间的密封连接，结构简单，不需要大型焊接设备，便于施工，可靠性高，可以有效地实现连续油管的再利用，不仅适用于常规金属材质的连续油管，也适用于非金属、复合金属、焊接难度高的耐蚀合金材质的连续油管以及井队现场对连续油管的修复作业。
其中，所述第一管段1和所述第二管段2的内径和外径分别相同，处于径向膨胀状态的所述第一连接管3的内径比所述第一管段1的外径大0.3mm-0.5mm，处于径向收缩状态的所述第二连接管4的外径比所述第一管段1的内径小0.3mm-0.5mm。第一管段1和第二管段2 可以为同一连续油管意外断开形成，也可以是同规格、同钢级的不同连续油管，其内径和外径相同。第一连接管3的内径大于连续油管的外径，使得第一连接管3可以容易地套设在连续油管的接缝处，第二连接管4的外径小于连续油管的内径，使得第二连接管4可以容易地插入到连续油管的接缝处。
其中，恢复形状的所述第一连接管3的内径比所述第一管段1的外径小0.2mm-0.4mm，恢复形状的所述第二连接管4的外径比所述第一管段1的内径大0.2mm-0.4mm。恢复形状后，第一连接管3的内径减小，其内径比第一管段1和第二管段2的外径小，实现过盈配合，类似的，恢复形状后，第二连接管4的外径增加，其外径大于第一管段1和第二管段2的外径，实现过盈配合，不仅实现了第一管段1和第二管段2的对接，而且保证了连接处的密封性。
其中，所述第一连接管3的内周面上设置有齿部，所述第二连接管4的外周面上设置有齿部。齿部的设计，一是减少第一连接管3与第一管段1和第二管段2的外周面之间的表面接触状态，形成多个相对独立的接触面积，增加接触效果，提高整个接触面的静摩擦力；二是各个相互独立的齿顶可形成相互独立的密封接触面，从而提高整个接触面的密封性能。
进一步的，如图2和图3所示，所述第一连接管3上的齿部包括位于所述第一管段1处的第一齿部31和位于所述第二管段2处的第二齿部32，所述第一齿部31的顶端和所述第二齿部32的顶端朝向彼此倾斜，所述第二连接管4上的齿部包括位于所述第一管段1处的 第三齿部41和位于所述第二管段2处的第四齿部42，所述第三齿部41的顶端和所述第四齿部42的顶端朝向彼此倾斜。在将第一连接管3套设于第一管段1和第二管段2后，位于第一管段1处的齿部为第一齿部31，位于第二管段2处的齿部为第二齿部32，齿部的顶端相对于底部是倾斜的，其倾斜方向为第一齿部31和第二齿部32朝向彼此倾斜；类似的，第二连接管4上设置有第三齿部41和第四齿部42，并且第三齿部41的顶端和第四齿部42的顶端朝向彼此倾斜。另外，第一齿部31的倾斜方向与第一管段1从第一连接管3中脱离的方向相反，第一齿部31倾斜地向第一管段1施加作用力，以防止第一管段1从第一连接管3中脱离，第二齿部32、第三齿部41、第四齿部42也是类似的情况，在此不再重复说明。可以看出，齿部采用受拉面斜角度的齿形结构，可有效增加齿部在拉伸载荷时的稳定性，提高受拉承载能力，同时，该齿形结构有利于将第一连接管3套设在第一管段1和第二管段2上，将第二连接管4插入到第一管段1和第二管段2内。
进一步的，所述齿部的齿顶宽度为1mm-2mm，齿根宽度为2mm-3mm，齿槽的深度为壁厚的5％-10％。参考图2所示，第一齿部31的顶端(齿顶)的宽度小于底部(齿根)的宽度，第一齿部31朝向第二齿部32的侧面与垂直于第一连接管3的中心轴线方向的截面存在较小的角度，即第一齿部31朝向第二齿部32倾斜的角度，第二齿部32背向第二齿部32的侧面也为倾斜面，其与垂直于中心轴线方向的截面的夹角更大。
其中，所述齿部的顶面设有2条深度为0.2-0.4mm，宽度为0.4～0.6mm的矩形凹槽。参考图4所示，第一齿部31的齿顶面设有2条深度为0.2-0.4mm，宽度为0.4～0.6mm的矩形凹槽311。该矩形浅槽的设置有助于进一步的增加第一连接管3和第一管段1间的接触静摩擦力，提高密封性能和连接强度。第二齿部32、第三齿部41和第四齿部42的顶面均设有类似于矩形凹槽311的矩形凹槽。
另外，连续油管的非焊接式修复方法包括：在S1中，在所述第一管段1和所述第二管段2的接缝处填充金属胶。金属胶可以粘接第一管段1和第二管段2，金属胶可以为AB型胶，即将两种不同胶水混合后来粘接物品。在S1中，可以先将第二连接管4部分(例如具有第三齿部31的部分)地插入第一管段1和第二管段2的其中一者，并且将第一连接管3完全套设在第一管段1或第二管段2上，再第二连接管4插入另一者，使得第一管段1和第二管段2对接，然后在接缝处填充金属胶，然后滑动第一连接管3，使得第一齿部31位于第一管段1处且第二齿部32位于第二管段2处。
进一步的，在填充金属胶之前，对所述第一管段1和所述第二管段2进行端部平整，在所述第一管段1和所述第二管段2的接缝处加工出坡口。第一管段1和第二管段2的端面之间形成坡口，以允许填充合适的量的金属胶。
可选择的，加热温度为50°～65°，保温时间为35min～50min。参考图1所示，可以将加热装置5包覆在第一连接管3外部，实现对第一连接管3和第二连接管4的加热，加热温度可以位于转变温度以上， 并且需要保温一段时间，使得第一连接管3和第二连接管4在足够长的加热时间内恢复到原来的形状。
其中，所述形状记忆合金为镍钛形状记忆合金。镍钛形状记忆合金的转变温度约为50°，该转变温度相对较低，可以通过加热装置更容易地将第一连接管3和第二连接管4加热到该温度，更便于操作。
以上结合附图详细描述了本发明的优选实施方式，但是，本发明并不限于此。在本发明的技术构思范围内，可以对本发明的技术方案进行多种简单变型，包括各个具体技术特征以任何合适的方式进行组合。为了避免不必要的重复，本发明对各种可能的组合方式不再另行说明。但这些简单变型和组合同样应当视为本发明所公开的内容，均属于本发明的保护范围。

Claims (16)

  1. 一种连续油管的非焊接式修复方法，其特征在于，所述连续油管包括第一管段(1)和第二管段(2)，连续油管的非焊接式修复方法包括：
    S1、在第一管段(1)和第二管段(2)的接缝处设置套设在所述第一管段(1)和所述第二管段(2)外部的第一连接管(3)和插入所述第一管段(1)和所述第二管段(2)内部的第二连接管(4)，所述第一连接管(3)和所述第二连接管(4)由形状记忆合金制成，所述第一连接管(3)处于径向膨胀状态，所述第二连接管(4)处于径向收缩状态；
    S2、加热所述第一连接管(3)和所述第二连接管(4)至转变温度，所述第一连接管(3)恢复形状且所述第一连接管(3)的内周面与所述第一管段(1)的外周面和所述第二管段(2)的外周面密封贴合，所述第二连接管(4)恢复形状且所述第二连接管(4)的外周面与所述第一管段(1)的内周面和所述第二管段(2)的内周面密封贴合；
    其中，所述第一连接管(3)的内周面上设置有齿部，所述第二连接管(4)的外周面上设置有齿部，所述第一连接管(3)上的齿部包括位于所述第一管段(1)处的第一齿部(31)和位于所述第二管段(2)处的第二齿部(32)，所述第一齿部(31)的顶端和所述第二齿部(32)的顶端朝向彼此倾斜，所述第二连接管(4)上的齿部包括位于所述第一管段(1)处的第三齿部(41)和位于所述第二管 段(2)处的第四齿部(42)，所述第三齿部(41)的顶端和所述第四齿部(42)的顶端朝向彼此倾斜。
  2. 根据权利要求1所述的连续油管的非焊接式修复方法，其特征在于，所述第一管段(1)和所述第二管段(2)的内径和外径分别相同。
  3. 根据权利要求2所述的连续油管的非焊接式修复方法，其特征在于，处于径向膨胀状态的所述第一连接管(3)的内径比所述第一管段(1)的外径大0.3mm-0.5mm。
  4. 根据权利要求2所述的连续油管的非焊接式修复方法，其特征在于，处于径向收缩状态的所述第二连接管(4)的外径比所述第一管段(1)的内径小0.3mm-0.5mm。
  5. 根据权利要求1所述的连续油管的非焊接式修复方法，其特征在于，恢复形状的所述第一连接管(3)的内径比所述第一管段(1)的外径小0.2mm-0.4mm。
  6. 根据权利要求1所述的连续油管的非焊接式修复方法，其特征在于，恢复形状的所述第二连接管(4)的外径比所述第一管段(1)的内径大0.2mm-0.4mm。
  7. 根据权利要求1所述的连续油管的非焊接式修复方法，其特征在于，所述齿部的齿顶宽度为1mm-2mm。
  8. 根据权利要求7所述的连续油管的非焊接式修复方法，其特征在于，所述齿面的顶面设有2-3条深度为0.2-0.4mm，宽度为0.4～0.6mm的矩形凹槽。
  9. 根据权利要求1所述的连续油管的非焊接式修复方法，其特征在于，所述齿部的齿根宽度为2mm-3mm。
  10. 根据权利要求1所述的连续油管的非焊接式修复方法，其特征在于，所述齿部的齿槽的深度为壁厚的5％-10％。
  11. 根据权利要求1-10中任意一项所述的连续油管的非焊接式修复方法，其特征在于，连续油管的非焊接式修复方法包括：在S1中，在所述第一管段(1)和所述第二管段(2)的接缝处填充金属胶。
  12. 根据权利要求11所述的连续油管的非焊接式修复方法，其特征在于，在填充金属胶之前，对所述第一管段(1)和所述第二管段(2)进行端部平整，在所述第一管段(1)和所述第二管段(2)的接缝处加工出坡口。
  13. 根据权利要求1-12中任意一项所述的连续油管的非焊接式修复方法，其特征在于，加热温度为50°～65°。
  14. 根据权利要求1-13中任意一项所述的连续油管的非焊接式修复方法，其特征在于，保温时间为35min～50min。
  15. 根据权利要求1-14中任意一项所述的连续油管的非焊接式修复方法，其特征在于，所述第一连接管(3)为镍钛形状记忆合金制成。
  16. 根据权利要求1-14中任意一项所述的连续油管的非焊接式修复方法，其特征在于，所述第二连接管(4)为镍钛形状记忆合金制成。
PCT/CN2022/135955 2021-12-31 2022-12-01 连续油管的非焊接式修复方法 Ceased WO2023124754A1 (zh)

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