WO2011147189A1 - 钢管的螺纹连接结构 - Google Patents

钢管的螺纹连接结构 Download PDF

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Publication number
WO2011147189A1
WO2011147189A1 PCT/CN2011/000595 CN2011000595W WO2011147189A1 WO 2011147189 A1 WO2011147189 A1 WO 2011147189A1 CN 2011000595 W CN2011000595 W CN 2011000595W WO 2011147189 A1 WO2011147189 A1 WO 2011147189A1
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WO
WIPO (PCT)
Prior art keywords
steel pipe
thread
mating surface
axial
male thread
Prior art date
Application number
PCT/CN2011/000595
Other languages
English (en)
French (fr)
Inventor
陆金福
Original Assignee
Lu Jinfu
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lu Jinfu filed Critical Lu Jinfu
Publication of WO2011147189A1 publication Critical patent/WO2011147189A1/zh

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/042—Threaded
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
    • F16L15/001—Screw-threaded joints; Forms of screw-threads for such joints with conical threads
    • F16L15/004—Screw-threaded joints; Forms of screw-threads for such joints with conical threads with axial sealings having at least one plastically deformable sealing surface

Definitions

  • the invention discloses a threaded connection structure of a oil pipe, a casing or a line pipe used in an oil field.
  • API The round thread of the API and the partial thread of the API are clearly defined in the connection.
  • the male threaded end face 5 of the steel pipe field end 2 and the male threaded end face 5 of the steel pipe factory end 1 cannot be touched.
  • API The standard is controlled by the J value. (see picture 1 ).
  • the threaded connection of the above steel pipe has the following disadvantages: 1.
  • the comprehensive performance of the thread standard of the API standard is relatively poor; 2.
  • the special thread connection has a protruding anti-torque step for the female thread, which complicates the entire thread processing process and greatly increases the processing cost. .
  • the semi-special thread connection performance is not improved, and the intermediate gasket is easy to fall off and lost, and the safety is not enough.
  • the object of the present invention is to overcome the deficiencies in the prior art and provide a threaded connection structure of a steel pipe to overcome the technical bias, so that the end face of the male thread of the factory end and the end face of the male thread of the steel pipe field end can be directly contacted, the steel pipe
  • the combined performance of the threaded joint sealing performance and anti-gluing performance is better.
  • the threaded connection structure of the steel pipe includes a steel pipe factory End, steel pipe field end and coupling, the end of the steel pipe factory end has a male thread, the end of the steel pipe field end also has a male thread, the coupling has a female thread, the male thread of the steel pipe factory end and the female thread at one end of the coupling thread, steel pipe
  • the male thread at the field end is screwed with the female thread at the other end of the coupling, and is characterized in that: after the two steel pipes are joined by the coupling, the steel pipe factory end of one steel pipe has a male end end face and another steel pipe
  • the small end faces of the steel pipe with male threads at the field end are in close contact with each other; and the male thread at the factory end of the steel pipe and the male thread at the field end of the steel pipe are both right-handed or left-handed; the pitch of the male thread at the factory end of the steel pipe is smaller than the pitch of the male thread at the field end of the steel pipe Similarly, the end of the steel pipe factory
  • the joint of two different pitch female threads on the coupling is arranged to eliminate the notch of the incomplete thread, and the male thread end face of the steel pipe field end and the male thread end face of the steel pipe factory end are in close contact with each other to form an axial interference. Cooperate.
  • the small end of the male thread of the field end of the steel pipe includes a first axial matching surface and a second axial matching surface, and a first radial matching surface between the first axial matching surface and the second axial matching surface;
  • the male threaded small end of the steel pipe factory end also includes a third axial mating surface and a fourth axial mating surface, and a second radial mating surface between the third axial mating surface and the fourth axial mating surface;
  • the axial mating surface and the third axial mating surface are in close contact with each other to form a first axial interference fit;
  • the second axial mating surface and the fourth axial mating surface are in close contact with each other to form a second axial direction An interference fit;
  • the first radial mating surface and the second radial mating surface are in close contact with each other to form a radial interference or a radial interference-based interference fit.
  • a threaded connection structure of a steel pipe includes a steel pipe factory end, a steel pipe field end and a coupling, and a steel pipe factory end and a steel pipe field end end each have a male thread, and the coupling has the male thread Cooperating female thread; male thread of the steel pipe factory end is screwed with the female thread at one end of the coupling, the male thread of the steel pipe field end is screwed with the female thread of the other end of the coupling; the characteristic is: the small end face of the steel pipe factory end with male thread The small end faces with male threads on the field end of the steel pipe are in close contact with each other after joining by the coupling, and the male thread at the factory end of the steel pipe is opposite to the direction of rotation of the male thread at the field end of the steel pipe.
  • the joint of two different pitch female threads on the coupling is arranged to eliminate the notch of the incomplete thread, and the male thread end face of the steel pipe field end and the male thread end face of the steel pipe factory end are in close contact with each other to form an axial interference. Cooperate.
  • the small end of the male thread of the field end of the steel pipe includes a first axial matching surface and a second axial matching surface, and a first radial matching surface between the first axial matching surface and the second axial matching surface;
  • the male threaded small end of the steel pipe factory end also includes a third axial mating surface and a fourth axial mating surface, and a second radial mating surface between the third axial mating surface and the fourth axial mating surface;
  • the axial mating surface and the third axial mating surface are in close contact with each other to form a first axial interference fit;
  • the second axial mating surface and the fourth axial mating surface are in close contact with each other to form a second axial direction An interference fit;
  • the first radial mating surface and the second radial mating surface are in close contact with each other to form a radial interference or a radial interference-based interference fit.
  • the utility model utilizes the pitch of the thread end of the steel pipe factory to be smaller than the pitch of the thread on the field end of the steel pipe, and overcomes the technical prejudice, so that the male thread small end face 5 of the steel pipe factory end and the steel pipe small end end face 5 of the steel pipe field end can directly contact, so that the steel pipe connection Better sealing performance.
  • the invention pays more attention to the male thread of the steel pipe at the field end is API thread, and the pitch of the thread of the steel pipe factory end is smaller than the pitch of the thread end of the steel pipe, and the connection of the thread with the coupling is more advantageous for oil field use and work.
  • the processing of the factory has great practical value and economic benefits.
  • the length of the coupling is less than the length of the coupling of the API;
  • the complete thread (complete tooth shape) at the intersection of the threads in the middle of the coupling If it is not guaranteed to be a complete thread, it should be processed during processing. The incomplete thread is removed as shown in Figure 6.
  • the steel pipe of the present invention is a oil pipe, a casing or a line pipe
  • Figure 1 is a schematic view showing the connection structure of the existing API round thread and API partial body thread.
  • Figure 2 is a schematic view showing the structure of a special threaded connection of a conventional oil pipe or bushing.
  • Figure 3 is a schematic view of a conventional semi-special threaded connection structure.
  • Figure 4 is a schematic view showing the structure of Embodiment 1 of the present invention.
  • Fig. 5 is a schematic view showing the structure of a second embodiment of the present invention.
  • Figure 6 is a diagram showing the incomplete thread of the coupling of the present invention.
  • Figure 7 is an enlargement of the sealing surface of Figure 4.
  • the threaded connection structure of the steel pipe comprises a steel pipe factory end 1, a steel pipe field end 2 and a coupling 3, the end of the steel pipe factory end 1 has a male thread, and the end of the steel pipe field end 2 also has a male thread, and the coupling 3 has Female thread, the male thread of the steel pipe factory end 1 and the female thread of the coupling 3 end, the male thread of the steel field field end 2 and the female thread of the other end of the coupling 3 are characterized by: After the two steel pipes are joined, the small end face 5 of the steel pipe factory end 1 having the male thread and the small end face of the steel pipe field end 2 having the male thread of the other steel pipe are in close contact with each other; and the steel pipe factory end 1 Thread and the male thread of the field end of the steel pipe are both right-handed or left-handed; the pitch of the male thread of the steel pipe factory end 1 is smaller than the pitch of the male thread of the steel pipe field end 2; likewise, the female thread and the steel pipe on the coupling 3 The pitch of the male
  • the male threaded small end of the steel field field end 2 includes a first axial mating surface 7 and a second axial mating surface 8, at the first axial mating surface 7 and
  • the first axial mating surface 8 has a first radial mating surface 9;
  • the male threaded small end of the steel pipe factory end 1 also includes a third axial mating surface and a fourth axial mating surface, in the third axial fit a second radial mating surface between the surface and the fourth axial mating surface;
  • the first axial mating surface 7 and the third axial mating surface are in close contact with each other to form a first axial interference fit;
  • the second axial mating surface 8 and the fourth axial mating surface are in close contact with each other to form a second axial interference fit;
  • the first radial mating surface 9 and the second radial mating surface are in close contact with each other to form a diameter
  • An interference fit that is predominantly radial or radial
  • the joint of the two different pitch female threads on the coupling 3 is provided with a notch 6 for eliminating the incomplete thread.
  • the small end face of the male thread at the field end of the steel pipe and the small end face of the male thread at the factory end of the steel pipe are both flat, and only an axial interference fit is formed, and there is no radial interference fit.
  • coupling 3 has female thread (the thread pitch of the coupling 3 - end is 6 teeth / inch, the thread pitch of the other end is 5 teeth / inch ), the male thread of the steel pipe factory end 1 is connected with the female thread of the 3 end of the coupling, the male thread of the steel pipe field end 2 and the coupling 3
  • the female thread at one end is connected, and the male thread of the steel pipe factory end 1 and the male thread of the steel pipe field end 2 are both right-handed threads.
  • the thread pitch of the steel pipe factory end 1 is 6 teeth/inch (4.23mm)
  • the thread pitch of the steel pipe field end 2 is 5 teeth/inch (5.08mm)
  • the male thread small end face 5 of the steel pipe field end 2 and the steel pipe factory end 1 The male threaded end faces 5 are in intimate contact with each other to form an axial interference between the two 15° step metal sealing faces and a tapered radial faceted metal seal, see FIG. See Figure 7.
  • a threaded connection structure of a steel pipe comprising a steel pipe factory end 1, a steel pipe field end 2 and a coupling 3, a steel pipe factory end 1 and a steel pipe field end 2 end having a male thread
  • the coupling 3 has a matching with the male thread Female thread
  • the characteristic is: the steel pipe factory end 1 has The small end face 5 of the male thread and the small end face of the steel pipe field end 2 having the male thread are in close contact with each other after being joined by the coupling 3, and the male thread of the steel pipe factory end 1 and the male thread of the steel pipe field end 2 are rotated. The opposite direction.
  • the male threaded end of the steel field field end 2 includes a first axial mating surface 7 and a second axial mating surface 8, in the first axial mating surface 7 and
  • the first axial mating surface 8 has a first radial mating surface 9;
  • the male threaded small end of the steel pipe factory end 1 also includes a third axial mating surface and a fourth axial mating surface, in the third axial fit a second radial mating surface between the surface and the fourth axial mating surface;
  • the first axial mating surface 7 and the third axial mating surface are in close contact with each other to form a first axial interference fit;
  • the second axial mating surface 8 and the fourth axial mating surface are in close contact with each other to form a second axial interference fit;
  • the first radial mating surface 9 and the second radial mating surface are in close contact with each other to form a diameter Fit to interference or radial interference.
  • the joint of the two different pitch female threads on the coupling 3 is provided with a notch 6 for eliminating the incomplete thread.
  • the small end face of the male thread at the field end of the steel pipe and the male end face 5 of the steel pipe factory end are both flat, and only an axial interference fit is formed, and there is no radial interference fit.
  • the wall thickness is 5.51mm
  • the steel grade P110 the coupling 3 has the female thread, the male thread of the steel pipe factory end 1 and the female thread of the coupling 3 end, the steel pipe field end 2 The thread is connected with the female thread at the other end of the coupling 3.
  • the male thread of the steel pipe factory end 1 is left-handed thread
  • the male thread of the steel pipe field end 2 is also a right-hand thread
  • the thread tooth shape is a triangular round thread.
  • the pitch of the thread is 8 teeth/inch (3.175mm)
  • the male thread pitch of the steel pipe field end 2 is 8 teeth/inch (3.175mm)
  • the male thread end face of the steel pipe field end 2 and the male thread of the steel pipe factory end 1 are small.
  • the end faces 5 are in close contact with each other to form an axial interference 0° step, see Fig. 5.
  • the thread of the steel pipe factory end 1 of the present application refers to the thread connecting the coupling 3 and the steel pipe at the manufacturer;
  • the thread of the steel pipe field end 2 refers to the connection of the steel pipe to the coupling 3 at the use site of the steel pipe (such as oil field) Thread.
  • the male thread small end face 5 of the steel pipe factory end 1 and the male thread small end end face of the steel pipe field end 2 refer to the end face of the steel pipe (the end face may be a flat surface or a curved surface;
  • the small end of the thread and the small end of the male thread of the field end 2 of the steel pipe are respectively provided with two end faces, forming a first axial mating face 7 and a second axial mating face 8 as described above, and at the first axial mating face 7 and A first radial mating surface 9) is provided between the second axial mating faces 8.
  • the large end face of the male thread of the tapered threaded section is an imaginary end face, and the end face of the large end is located at the joint surface of the tapered threaded section and the steel pipe; the small end face of the male thread of the tapered threaded section generally refers to the steel pipe End face.
  • the steel pipe described in the present application may be a common steel pipe; however, it is particularly suitable for use in oil pipes, casings or line pipes used in oil fields, since such pipes are relatively long in length and particularly resistant to torque.
  • the male thread at the end of the field end 2 of the steel pipe is an API thread
  • the length of the coupling 3 is less than the length of the API coupling of the specification.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
  • Piles And Underground Anchors (AREA)

Description

钢管的螺纹连接结构 技术领域
本发明公开了一种油田使用的油管、 套管或管线管的螺纹连接结构。
背景技术
目前， 公知的油管、 套管或管线管的连接方法有如下三种：
1、 API的圆螺纹和 API的偏体形螺紋， 在它们连接中明确规定钢管现场端 2的公螺纹小端端面 5和钢管工厂端 1的公螺紋小端端面 5是不能碰上接触的， API标准用 J值来控制。 （见图 1 )。
2、 为了提高钢管（如油管、 套管、 管线管） 的综合连接性能， 如密封性能、 连接强度、 抗扭矩性能和抗弯曲性能等。 有人发明了油管、 套管、 管线管的特 殊螺纹的连接。 但钢管现场端 2的公螺紋小端端面 5和钢管工厂端 1的公螺纹 小端端面 5都没有直接接触， 是由接箍 3母螺纹的一个抗扭矩台阶隔开的。 见 图 2。
3、 API的圆螺紋和 API的偏体形螺纹， 在连接中， 钢管现场端 2的公螺纹 小端端面 5和钢管工厂端 1的公螺纹小端端面 5， 用一个垫片 4来隔开， 组成半 特殊螺纹连接。 见图 3。
4、 在现有技术中还有一种将钢管工厂端 1的公螺紋小端端面 5与钢管现场 端 2的公螺紋小端端面 5相互接触的设想， 但是由于没有将钢管现场端 2的螺 紋螺距设置成大于钢管工厂端 1 的螺纹螺距， 在使用过程中钢管工厂端 1的螺 纹容易松动脱扣， 引起油田事故， 因此长期以来在实际使用中没有办法推广。
在 API螺紋连接中为什么钢管工厂端 1的公螺纹小端端面 5和钢管现场端 2 的公螺纹小端端面 5不能直接接触？其原因是： 油田现场操作时， 钢管现场端 2 的公螺紋小端端面 5在相对接箍 3的母螺纹顺时针旋转前进时 （此时的母螺纹 接箍 3固定不动， 同时钢管工厂端 1的公螺纹是自由状态）， 只要发生钢管现场 端 2的公螺纹小端端面 5和钢管工厂端 1的公螺纹小端端面 5相接触， 此时就 会在接触处产生摩擦力， 此摩擦力就会使钢管工厂端 1 (也就是钢管本身）相对 母螺纹 （此时母螺紋接箍 3 是不动的） 进行逆时针旋转， 将原来在工厂生产中 拧紧的钢管工厂端 1 的公螺纹旋转松动退出， 使钢管螺紋连接失效， 引发井毁 的毁灭性事故。
以上钢管的螺紋连接存在以下缺点： 1、 API标准的螺纹连接的综合性能比 较差； 2、 特殊螺纹连接由于母螺紋有一个突出的抗扭矩台阶使整个螺纹加工工 艺复杂化， 使加工成本大大提高。 3、 半特殊螺纹连接性能提高不大， 而且中间 垫片容易脱落遗失， 安全性不够。
发明内容
本发明的目的是克服现有技术中存在的不足， 提供一种钢管的螺纹连接结 构， 以克服技术偏见， 使得工厂端的公螺纹小端端面和钢管现场端的公螺纹小 端端面可以直接接触， 钢管的螺纹连接密封性能、 抗粘扣性能等综合性能更好。
按照本发明提供的技术方案一， 所述钢管的螺纹连接结构， 包括钢管工厂 端、 钢管现场端和接箍， 钢管工厂端的端部具有公螺纹， 钢管现场端的端部也 具有公螺纹， 接箍具有母螺纹， 钢管工厂端的公螺纹与接箍一端的母螺纹螺接， 钢管现场端的公螺紋与接箍另一端的母螺纹螺接， 其特征是： 在利用接箍将两 根钢管接合后， 一根钢管的钢管工厂端具有公螺纹的小端端面与另一根钢管的 钢管现场端具有公螺纹的小端端面相互紧密接触； 且钢管工厂端的公螺纹与钢 管现场端的公螺紋同时为右旋螺紋或左旋螺紋； 钢管工厂端的公螺纹的螺距小 于钢管现场端的公螺纹的螺距； 同样地， 接箍上的母螺纹与钢管工厂端的公螺 紋螺接的螺距小于与钢管现场端的公螺纹螺接的螺距。
在接箍上两段不同螺距的母螺紋的结合部设置用于消除不完整螺紋的缺 口， 钢管现场端的公螺纹小端端面和钢管工厂端的公螺纹小端端面相互紧密接 触， 形成轴向过盈配合。
或者： 钢管现场端的公螺纹小端包括第一轴向配合面和第二轴向配合面， 在第一轴向配合面和第二轴向配合面间有第一径向配合面； 相应地， 钢管工厂 端的公螺纹小端也包括第三轴向配合面和第四轴向配合面， 在第三轴向配合面 和第四轴向配合面间有第二径向配合面； 所述第一轴向配合面和第三轴向配合 面间相互紧密接触， 形成第一轴向过盈配合； 所述第二轴向配合面和第四轴向 配合面间相互紧密接触， 形成第二轴向过盈配合； 所述第一径向配合面与第二 径向配合面间相互紧密接触， 形成径向过盈或径向过盈为主的过盈配合。
本发明提供的技术方案二， 一种钢管的螺纹连接结构， 包括钢管工厂端、 钢管现场端和接箍， 钢管工厂端和钢管现场端的端部均具有公螺纹， 接箍具有 与所述公螺纹配合的母螺纹； 钢管工厂端的公螺纹与接箍一端的母螺纹螺接， 钢管现场端的公螺纹与接箍另一端的母螺纹螺接； 其特征是： 钢管工厂端具有 公螺纹的小端端面与钢管现场端具有公螺紋的小端端面在利用接箍接合后是相 互紧密接触的， 且钢管工厂端的公螺纹与钢管现场端的公螺紋的旋转方向相反。
在接箍上两段不同螺距的母螺紋的结合部设置用于消除不完整螺纹的缺 口， 钢管现场端的公螺纹小端端面和钢管工厂端的公螺纹小端端面相互紧密接 触， 形成轴向过盈配合。
或者： 钢管现场端的公螺紋小端包括第一轴向配合面和第二轴向配合面， 在第一轴向配合面和第二轴向配合面间有第一径向配合面； 相应地， 钢管工厂 端的公螺纹小端也包括第三轴向配合面和第四轴向配合面， 在第三轴向配合面 和第四轴向配合面间有第二径向配合面； 所述第一轴向配合面和第三轴向配合 面间相互紧密接触， 形成第一轴向过盈配合； 所述第二轴向配合面和第四轴向 配合面间相互紧密接触， 形成第二轴向过盈配合； 所述第一径向配合面与第二 径向配合面间相互紧密接触， 形成径向过盈或径向过盈为主的过盈配合。
本发明利用钢管工厂端螺纹的螺距小于钢管现场端螺纹的螺距， 克服了技 术偏见， 使得钢管工厂端的公螺纹小端端面 5 和钢管现场端公螺纹小端端面 5 可以直接接触， 使得钢管的连接密封性能更好。
本发明更注重钢管现场端公螺纹为 API螺纹， 钢管工厂端螺纹的螺距小于 钢管现场端螺纹的螺距， 利用这样的螺紋与接箍连接， 更有利于油田使用和工 厂的加工， 有巨大的实用价值和经济效益。 这时候就要注意： a、 接箍的长度小 于 API的接箍长度； b、 在接箍中间螺纹的交汇处是完整螺纹 （完整牙形） ， 如 果不能保证是完整螺紋， 在加工时要把不完整螺纹消除掉如图 6所示。
本发明所述的钢管为油管、 套管或管线管
附图说明
图 1是现有的 API圆螺纹和 API偏体形螺纹的连接结构示意图。
图 2是现有的油管或套管的特殊螺纹连接的结构示意图。
图 3是现有的半特殊螺纹连接结构示意图。
图 4是本发明实施例 1的结构示意图。
图 5是本发明实施例 2的结构示意图。
图 6是本发明接箍消除不完整螺纹图。
图 7是图 4密封面的放大。
具体实施方式
下面结合具体附图和实施例对本发明作进一步说明。
实施例 1
一种钢管的螺纹连接结构， 包括钢管工厂端 1、 钢管现场端 2和接箍 3， 钢 管工厂端 1的端部具有公螺纹， 钢管现场端 2的端部也具有公螺纹， 接箍 3具 有母螺纹， 钢管工厂端 1 的公螺纹与接箍 3—端的母螺紋螺接， 钢管现场端 2 的公螺纹与接箍 3另一端的母螺纹螺接， 其特征是： 在利用接箍 3将两根钢管 接合后， 一根钢管的钢管工厂端 1具有公螺纹的小端端面 5与另一根钢管的钢 管现场端 2具有公螺纹的小端端面相互紧密接触； 且钢管工厂端 1 的公螺纹与 钢管现场端 2的公螺纹同时为右旋螺紋或左旋螺纹； 钢管工厂端 1 的公螺纹的 螺距小于钢管现场端 2的公螺纹的螺距； 同样地， 接箍 3上的母螺紋与钢管工 厂端 1的公螺纹螺接的螺距小于与钢管现场端 2的公螺纹螺接的螺距。
形成轴向， 径向过盈配合的具体方式是， 钢管现场端 2 的公螺纹小端包括 第一轴向配合面 7和第二轴向配合面 8，在第一轴向配合面 7和第二轴向配合面 8间有第一径向配合面 9; 相应地， 钢管工厂端 1的公螺纹小端也包括第三轴向 配合面和第四轴向配合面， 在第三轴向配合面和第四轴向配合面间有第二径向 配合面； 所述第一轴向配合面 7和第三轴向配合面间相互紧密接触， 形成第一 轴向过盈配合； 所述第二轴向配合面 8和第四轴向配合面间相互紧密接触， 形 成第二轴向过盈配合； 所述第一径向配合面 9与第二径向配合面间相互紧密接 触， 形成径向或径向为主的过盈配合。 所谓以径向过盈为主是指径向配合面的 过盈量大于轴向配合面的过盈量。
另一种方式是， 在接箍 3 上两段不同螺距的母螺紋的结合部设置用于消除 不完整螺纹的缺口 6。这时钢管现场端的公螺纹小端端面与钢管工厂端的公螺纹 小端端面都是平面， 只形成轴向过盈配合， 没有径向过盈配合。
例如， 在规格为 9"5/8， 壁厚 11.99mm， 钢级 P110， 接箍 3具有母螺纹（接 箍 3—端的螺紋螺距为 6牙 /英寸， 另一端的螺纹螺距为 5牙 /英寸）， 钢管工厂 端 1的公螺紋与接箍 3—端的母螺纹连接， 钢管现场端 2的公螺纹与接箍 3另 一端的母螺纹连接， 钢管工厂端 1 的公螺纹与钢管现场端 2的公螺纹同时为右 旋螺纹。 钢管工厂端 1的螺紋螺距是 6牙 /英寸 （4.23mm)， 钢管现场端 2的螺 紋螺距为 5牙 /英寸 （5.08mm)， 钢管现场端 2的公螺紋小端端面 5和钢管工厂 端 1的公螺纹小端端面 5是相互紧密接触的，形成两个 15°台阶金属密封面轴向 过盈， 和一个带锥度的面径向过盈的金属密封， 见图 4。 见图 7.
实施例 2
一种钢管的螺纹连接结构， 包括钢管工厂端 1、 钢管现场端 2和接箍 3， 钢 管工厂端 1和钢管现场端 2的端部均具有公螺紋， 接箍 3具有与所述公螺纹配 合的母螺纹； 钢管工厂端 1的公螺纹与接箍 3—端的母螺纹螺接， 钢管现场端 2 的公螺纹与接箍 3另一端的母螺纹螺接； 其特征是： 钢管工厂端 1具有公螺纹 的小端端面 5与钢管现场端 2具有公螺纹的小端端面在利用接箍 3接合后是相 互紧密接触的， 且钢管工厂端 1 的公螺纹与钢管现场端 2的公螺紋的旋转方向 相反。
形成轴向， 径向过盈配合的具体方式是， 钢管现场端 2 的公螺纹小端括第 一轴向配合面 7和第二轴向配合面 8， 在第一轴向配合面 7和第二轴向配合面 8 间有第一径向配合面 9; 相应地， 钢管工厂端 1的公螺纹小端也包括第三轴向配 合面和第四轴向配合面， 在第三轴向配合面和第四轴向配合面间有第二径向配 合面； 所述第一轴向配合面 7和第三轴向配合面间相互紧密接触， 形成第一轴 向过盈配合； 所述第二轴向配合面 8和第四轴向配合面间相互紧密接触， 形成 第二轴向过盈配合； 所述第一径向配合面 9与第二径向配合面间相互紧密接触， 形成径向过盈或径向过盈为主的配合。 所谓以径向过盈为主是指径向配合面的 ii^i^ f?由向酉己^ " 的 0
另一种方式是， 在接箍 3 上两段不同螺距的母螺纹的结合部设置用于消除 不完整螺紋的缺口 6。这时钢管现场端的公螺纹小端端面与钢管工厂端的公螺纹 小端端面 5都是平面， 只形成轴向过盈配合， 没有径向过盈配合。
例如， 在规格为 2"7/8， 壁厚 5.51mm， 钢级 P110， 接箍 3具有母螺纹， 钢 管工厂端 1的公螺纹与接箍 3—端的母螺纹连接， 钢管现场端 2的公螺纹与接 箍 3另一端的母螺紋连接， 钢管工厂端 1 的公螺紋为左旋螺纹， 钢管现场端 2 的公螺纹同时为右旋螺纹， 螺纹齿形为三角形圆螺紋。 钢管工厂端 1 的公螺纹 的螺距是 8 牙 /英寸 （3.175mm)， 钢管现场端 2 的公螺纹螺距为 8 牙 /英寸 (3.175mm), 钢管现场端 2的公螺纹小端端面和钢管工厂端 1的公螺纹小端端 面 5是相互紧密接触的形成一个轴向过盈 0°台阶， 见图 5。
本申请所述钢管工厂端 1的螺纹是指在生产厂家连接接箍 3和钢管的螺紋; 钢管现场端 2的螺纹是指在钢管的使用现场 （如油田） 将钢管与接箍 3连接时 的螺纹。 所述钢管工厂端 1的公螺纹小端端面 5和钢管现场端 2的公螺纹小端 端面是指钢管的端面 （该端面可以是平面， 也可以是曲面； 还可以在钢管工厂 端 1 的公螺纹小端和钢管现场端 2的公螺纹小端分别设置两个端面， 形成如上 所述的第一轴向配合面 7和第二轴向配合面 8，并在第一轴向配合面 7和第二轴 向配合面 8间设置第一径向配合面 9)。 由于钢管的 API螺纹段是锥形的， 因此 该锥形螺纹段的公螺紋大端端面是一个假想的端面， 该大端端面位于锥形螺纹 段与钢管的接合面； 该锥形螺纹段的公螺纹小端端面一般是即指上述钢管的端 面。
本申请所述的钢管可以是普通钢管； 但是特别适用于油田所用的油管、 套 管或管线管， 因为这类管件的长度比较长， 承受的扭矩特别大。 在本申请中， 当钢管现场端 2端部的公螺纹是 API螺纹时， 接箍 3的长度小于该规格的 API 接箍的长度。

Claims

权 利 要 求 书
1、 一种钢管的螺纹连接结构， 包括钢管工厂端 （1 )、 钢管现场端 （2) 和 接箍 （3 )， 钢管工厂端 （1 ) 的端部具有公螺纹， 钢管现场端 （2) 的端部也具 有公螺紋， 接箍 （3 ) 具有母螺纹， 钢管工厂端 （1 ) 的公螺纹与接箍 （3 ) —端 的母螺纹螺接， 钢管现场端 （2) 的公螺纹与接箍 （3 ) 另一端的母螺纹螺接， 其特征是： 在利用接箍 （3 ) 将两根钢管接合后， 一根钢管的钢管工厂端 （1 ) 具有公螺纹的小端端面 （5 ) 与另一根钢管的钢管现场端 （2) 具有公螺纹的小 端端面相互紧密接触； 且钢管工厂端 （1 ) 的公螺紋与钢管现场端 （2) 的公螺 纹同时为右旋螺纹或左旋螺纹； 钢管工厂端 （1 ) 的公螺纹的螺距小于钢管现场 端 （2) 的公螺紋的螺距； 同样地， 接箍 （3 ) 上的母螺纹与钢管工厂端 （1 ) 的 公螺纹螺接的螺距小于与钢管现场端 （2) 的公螺紋螺接的螺距。
2、 根据权利要求 1所述钢管的螺纹连接结构， 其特征是： 钢管现场端 （2) 的公螺纹小端端面和钢管工厂端 （1 ) 的公螺纹小端端面 （5 ) 相互紧密接触， 车由向 酉己
^
3、 根据权利要求 1所述钢管的螺紋连接结构， 其特征是： 钢管现场端 （2) 的公螺纹小端包括第一轴向配合面 （7) 和第二轴向配合面 （8)， 在第一轴向配 合面 （7) 和第二轴向配合面 （8) 间有第一径向配合面 （9); 相应地， 钢管工 厂端 （1 ) 的公螺纹小端也包括第三轴向配合面和第四轴向配合面， 在第三轴向 配合面和第四轴向配合面间有第二径向配合面； 所述第一轴向配合面 （7)和第 三轴向配合面间相互紧密接触， 形成第一轴向过盈配合； 所述第二轴向配合面
(8) 和第四轴向配合面间相互紧密接触， 形成第二轴向过盈配合； 所述第一径 向配合面 （9) 与第二径向配合面间相互紧密接触， 形成径向过盈或径向过盈为 主的过盈酉己合。
4、 根据权利要求 1 所述钢管的螺纹连接结构， 其特征是： 在接箍 （3 ) 上 两段不同螺距的母螺纹的结合部设置用于消除不完整螺纹的缺口 （6)。
5、 一种钢管的螺纹连接结构， 包括钢管工厂端 （1 )、 钢管现场端 （2) 和 接箍（3 )， 钢管工厂端（1 )和钢管现场端（2) 的端部均具有公螺紋， 接箍（3) 具有与所述公螺纹配合的母螺纹； 钢管工厂端 （1 ) 的公螺纹与接箍 （3 ) —端 的母螺纹螺接， 钢管现场端 （2) 的公螺纹与接箍 （3 ) 另一端的母螺纹螺接； 其特征是： 钢管工厂端 （1 ) 具有公螺紋的小端端面 （5) 与钢管现场端 （2) 具 有公螺纹的小端端面在利用接箍（3)接合后是相互紧密接触的， 且钢管工厂端
( 1 ) 的公螺纹与钢管现场端 （2) 的公螺紋的旋转方向相反。
6、 根据权利要求 5所述钢管的螺纹连接结构， 其特征是： 钢管现场端 （2) 的公螺纹小端端面和钢管工厂端 （1 ) 的公螺紋小端端面 （5 ) 相互紧密接触， 车由向 ϋ 酉己^ *
^ 7、 根据权利要求 5所述钢管的螺纹连接结构， 其特征是： 钢管现场端 （2) 的公螺纹小端包括第一轴向配合面 （7) 和第二轴向配合面 （8)， 在第一轴向配 合面 （7) 和第二轴向配合面 （8) 间有第一径向配合面 （9); 相应地， 钢管工 厂端 （1 ) 的公螺纹小端也包括第三轴向配合面和第四轴向配合面， 在第三轴向 配合面和第四轴向配合面间有第二径向配合面； 所述第一轴向配合面 （7)和第 三轴向配合面间相互紧密接触， 形成第一轴向过盈配合； 所述第二轴向配合面 (8) 和第四轴向配合面间相互紧密接触， 形成第二轴向过盈配合； 所述第一径 向配合面 （9) 与第二径向配合面 （9) 间相互紧密接触， 形成径向过盈或径向 过盈为主的过盈酉己合。
8、 根据权利要求 5 所述钢管的螺纹连接结构， 其特征是： 在接箍 （3 ) 上 两段不同螺距的母螺纹的结合部设置用于消除不完整螺紋的缺口 （6)。
9、 根据权利要求 1或 5所述钢管的螺紋连接结构， 其特征是： 当钢管现场 端 （2) 端部的公螺纹是 API螺纹时， 接箍 （3 ) 的长度小于该规格的 API接箍 的长度。
10、 根据权利要求 1或 5所述钢管的螺纹连接结构， 其特征是： 所述钢管 为油管、 套管或管线管。
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016130021A3 (en) * 2015-02-13 2016-11-24 Arne Barrett Sele Method for connecting two pipe sections and threaded pipe connection
CN111456649A (zh) * 2020-04-10 2020-07-28 刘超 一种油井专用套管短节
US11614186B1 (en) 2020-03-25 2023-03-28 PTC Liberty Tubulars LLC Box connection for a pin with relieved thread region

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101839379A (zh) * 2010-05-25 2010-09-22 陆金福 钢管的螺纹连接方法
CN102116135B (zh) * 2011-02-14 2016-09-07 江苏常宝钢管股份有限公司 防松动高气密螺纹套管连接结构
CN110043196B (zh) * 2019-04-11 2021-01-29 中国石油天然气集团有限公司 一种油井管外螺纹接头端面密封圈结构
CN112824642A (zh) * 2019-11-20 2021-05-21 宝山钢铁股份有限公司 一种高抗粘扣性能的偏梯形螺纹接头

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001065754A (ja) * 1999-08-27 2001-03-16 Sumitomo Metal Ind Ltd 油井管用ねじ継手
CN1289018A (zh) * 1999-09-16 2001-03-28 西德尔卡有限公司 高安定性及稳定性的螺纹接头
US6406070B1 (en) * 2000-11-03 2002-06-18 Grant Prideco, Lp Casing drilling connector with low stress flex groove
US7347459B2 (en) * 2004-04-30 2008-03-25 Gb Tubulars, Inc. Coupling for drilling-with-casing operations
CN101839379A (zh) * 2010-05-25 2010-09-22 陆金福 钢管的螺纹连接方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4397484A (en) * 1982-04-16 1983-08-09 Mobil Oil Corporation Locking coupling system
US4762344A (en) * 1985-01-30 1988-08-09 Lee E. Perkins Well casing connection
US6817633B2 (en) * 2002-12-20 2004-11-16 Lone Star Steel Company Tubular members and threaded connections for casing drilling and method
US7438329B2 (en) * 2005-01-11 2008-10-21 V&M Atlas Bradford, Lp Methods and connections for coupled pipe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001065754A (ja) * 1999-08-27 2001-03-16 Sumitomo Metal Ind Ltd 油井管用ねじ継手
CN1289018A (zh) * 1999-09-16 2001-03-28 西德尔卡有限公司 高安定性及稳定性的螺纹接头
US6406070B1 (en) * 2000-11-03 2002-06-18 Grant Prideco, Lp Casing drilling connector with low stress flex groove
US7347459B2 (en) * 2004-04-30 2008-03-25 Gb Tubulars, Inc. Coupling for drilling-with-casing operations
CN101839379A (zh) * 2010-05-25 2010-09-22 陆金福 钢管的螺纹连接方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016130021A3 (en) * 2015-02-13 2016-11-24 Arne Barrett Sele Method for connecting two pipe sections and threaded pipe connection
US11614186B1 (en) 2020-03-25 2023-03-28 PTC Liberty Tubulars LLC Box connection for a pin with relieved thread region
CN111456649A (zh) * 2020-04-10 2020-07-28 刘超 一种油井专用套管短节

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