WO2014146428A1 - 超高抗扭金属气密封钻杆接头 - Google Patents

超高抗扭金属气密封钻杆接头 Download PDF

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Publication number
WO2014146428A1
WO2014146428A1 PCT/CN2013/085552 CN2013085552W WO2014146428A1 WO 2014146428 A1 WO2014146428 A1 WO 2014146428A1 CN 2013085552 W CN2013085552 W CN 2013085552W WO 2014146428 A1 WO2014146428 A1 WO 2014146428A1
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WIPO (PCT)
Prior art keywords
shoulder
drill pipe
joint
axial direction
resistant metal
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PCT/CN2013/085552
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English (en)
French (fr)
Inventor
赵鹏
王鸣华
刘绍锋
元麟
耿伯成
Original Assignee
宝山钢铁股份有限公司
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Application filed by 宝山钢铁股份有限公司 filed Critical 宝山钢铁股份有限公司
Priority to CA2888290A priority Critical patent/CA2888290C/en
Priority to US14/778,371 priority patent/US11262005B2/en
Publication of WO2014146428A1 publication Critical patent/WO2014146428A1/zh

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Classifications

    • 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
    • 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

Definitions

  • the present invention relates to a joint, and more particularly to a drill pipe joint. Background technique
  • an oil drilling drill pipe is: An externally threaded drill pipe joint and an internally threaded drill pipe joint are welded to each end of the drill pipe body.
  • Figure 1 shows a drill pipe joint manufactured in accordance with API standards.
  • the drill pipe joint is composed of an externally threaded joint 1 1 and an internally threaded joint 12 threadedly connected thereto; wherein the externally threaded joint 11 has an outer shoulder 13 and an inner end surface 15 on the outer shoulder 13 Between the inner end faces 15 there is an external thread 17; the internally threaded joint 12 has an outer end face 14 and an inner bevel 16 with an internal thread 18 between the outer end face 14 and the inner bevel 16 .
  • the torque experienced by the drill pipe joint shown in Fig. 1 is derived from the friction between the outer shoulder 13 and the outer end face 14, and between the external thread 17 and the internal thread 18.
  • the joint has a torsional strength of typically 80% of the drill pipe body.
  • the current drilling technology has been developed in the direction of deep wells, ultra-deep wells, directional wells, large-displacement wells, horizontal wells, etc. Therefore, the service conditions of the drill pipe are getting worse, the drill pipe and its joints Must be able to withstand large internal and external pressures, torsional strength and vibration strength. If the joint encounters excessive torque during use, there is a high probability that a threaded joint expansion or a threaded joint of the male thread will break, causing a drilling safety accident.
  • the drill pipe joint is composed of an externally threaded joint 21 and an internally threaded joint 22, and the externally threaded joint 21 has an external thread 27 extending axially between the outer shoulder 23 and the inner end surface 25, and the externally threaded joint is also a front end tapered metal seal 20 having an inner end surface 25 and an external thread 27; the female threaded joint 22 has an internal thread 28 extending axially between the outer end surface 24 and the inner shoulder 26, the female threaded joint 22 also having A rear spherical metal seal 29 between the inner shoulder 26 and the internal thread 28; the sealing surface between the two metal seals is fitted with a cone facing spherical fit seal.
  • the announcement number is CN201474625, and the announcement date is May 19, 2010.
  • the name is "A super high resistance.
  • the Chinese patent document for twisted metal hermetic drill pipe joints discloses a metal hermetic drill pipe joint having ultra high torsional resistance.
  • the drill pipe joint is composed of an externally threaded joint 31 and a female threaded joint 32.
  • the outer threaded joint 31 has a tapered sealing surface 33
  • the female threaded joint 32 has a spherical sealing surface 34.
  • the male threaded joint 31 further has an external thread 35
  • the female threaded joint 32 further has an internal thread 36; the external thread 35 and
  • the taper of the internal thread 36 ranges from 1/12 to 1/20.
  • an ultra-high torsion-resistant metal hermetic drill pipe joint comprising: an externally threaded joint having one radially outward end on one end in the axial direction, the axial direction thereof The other end in the direction is an inner end surface, and an external thread segment and a first sealing surface are sequentially arranged from the outer shoulder to the inner end surface along the axial direction of the external thread joint;
  • An internally threaded joint threadedly connected to the externally threaded joint has one end in the axial direction having a radially inward inner shoulder, and the other end in the axial direction is an outer end surface, from the inner shoulder to the inner shoulder The outer end surface is sequentially provided with a second sealing surface and an internal thread segment engaged with the external thread segment along the axial direction of the female threaded joint;
  • the inner end surface is matched with the shoulder surface of the inner shoulder, and the outer end surface is matched with the shoulder surface of the outer shoulder; the first sealing surface and the second sealing surface are both inclined surfaces, and the two are sealed by an interference fit .
  • the distance between the outer shoulder and the inner end surface of the externally threaded joint in the technical solution is greater than the distance between the outer shoulder and the inner end surface of the externally threaded joint of the AP I standard drill pipe, but smaller than the AP I standard drill pipe The distance between the inner shoulder and the outer end of the internally threaded joint.
  • the inner end surface and the shoulder surface of the inner shoulder are both inclined surfaces.
  • the arrangement can increase the contact area between the inner and outer threaded joints to form an additional friction torque, thereby improving the torsional strength of the drill pipe joint; on the other hand, the auxiliary seal can be used to further improve the drill pipe joint. Sealing performance.
  • the inclination angle of the shoulder surface of the inner end surface and the inner shoulder is -15 degrees.
  • inner threaded section and the outer threaded section are inclined with respect to a horizontal plane.
  • the inclined taper of the inner threaded section and the outer threaded section is not more than 1:12.
  • Both the API-compliant connector and the existing high-torque connector have a taper of 1:6.
  • the inner and outer threaded joints adopt a relatively flat taper design to increase the contact area between the inner end surface of the male threaded joint and the shoulder surface of the inner shoulder of the female threaded joint to form an additional The friction torque increases the torsional strength of the drill pipe joint.
  • the inner threaded section and the outer threaded section have an inclined taper of 1:16.
  • the interference of the above-mentioned interference fit sealing connection is 0. 10 ⁇ 0. 40mm.
  • Set the interference to 0. 10 ⁇ 0. 40mm, which can better achieve the sealing fit between the internal and external threaded joints and strengthen the sealing effect between the two.
  • a gap of 0 to 0.5 ⁇ is provided between the inner end surface and the shoulder surface of the inner shoulder. Since the inner and outer threaded joints are sealed by an interference fit, when the two are manually tightened, there may be a slight gap between the inner end surface of the male threaded joint and the inner shoulder of the female threaded joint; When the downhole torque is too large, the gap between the inner end surface of the male connector and the inner shoulder of the female connector will gradually decrease until it disappears and closes. At this time, the joint portion of the drill pipe forms a complete rigid body, so that the joint It has high torsional strength and high bending resistance.
  • the ultra-high torsion-resistant metal hermetic drill pipe joint of the present invention has higher torsional strength, and its torsional strength is increased by about 70% compared with the AP I standard joint.
  • the ultra-high torsion-resistant metal hermetic drill pipe joint of the present invention still has relatively high torsional strength, and has a gas sealing capacity of up to 100 MPa, showing that it is superior.
  • the ultra-high torsion-resistant metal hermetic drill pipe joint of the present invention also has a good ability to repeatedly shackle.
  • the ultra-high torque-resistant metal gas-sealed drill pipe joint of the present invention has high torsional strength, high airtightness and repeated shackle-removing capability, and can be widely applied to deep wells, ultra-deep wells, directional wells, Exploration work for high-pressure gas wells with high difficulty and complicated conditions, such as horizontal wells and high-angle wells.
  • Figure 1 is a schematic view showing the structure of an API standard joint.
  • 2 is a schematic structural view of a drill pipe joint in the prior art.
  • FIG. 3 is a schematic structural view of another drill pipe joint in the prior art.
  • FIG. 4 is a schematic view showing the structure of an ultra-high torsion-resistant metal hermetic drill pipe joint according to an embodiment of the present invention. Detailed description of the invention
  • the outer diameter of the ultra-high torsion metal gas-sealed drill pipe joint is
  • a radially outward outer shoulder 42 is provided at one end in the axial direction of the male threaded joint, and an inner end surface 43 is provided at the opposite end from the outer shoulder 42 toward the inner end surface 43 in the P direction.
  • a base portion 44, an inclined external thread segment 45 and a first sealing slope 46 are disposed in sequence; one end in the axial direction of the female threaded joint 51 is provided with a radially inward inner shoulder 52, and the other end is provided outside
  • the end surface 53 is provided with a second sealing bevel 56, an internal thread segment 55 and a bore 54 that mesh with the externally threaded portion in this order from the inner shoulder 52 toward the Q direction of the outer end surface 53.
  • first sealing inclined surface 46 and the second sealing inclined surface 56 are both inclined surfaces and are provided with an interference fit sealing connection; the inner end surface 43 is matched with the shoulder surface inclined surface of the inner shoulder 52, the inclination angle is -15°, and the outer end surface 53 is The shoulder surface of the outer shoulder 42 is matched.
  • the adjacent two drill pipes are manually hand-tightened, and the inner end surface of the externally threaded joint and the inner shoulder of the female threaded joint are used.
  • the gap between the shoulder faces is 0.15 mm.
  • the length between the outer end surface 53 of the female joint 51 and the inner shoulder 52 is L4, and the length between the inner end surface 43 of the male joint 41 and the outer shoulder 42 is L3, therefore,
  • the gap of 0.15 mm is the value of length L4 minus length L3.
  • the inclined taper of the female threaded section 55 and the externally threaded section 45 is 1:16.
  • the interference between the first sealing bevel 46 and the second sealing bevel 56 is 0.20 mm.

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

Abstract

一种超高抗扭金属气密封钻杆接头，其包括：一外螺纹接头（41），其轴向方向上的一端具有一径向向外的外台肩（42），其轴向方向上的另一端为一内端面（43），自外台肩（42）至内端面（43）沿外螺纹接头（41）的轴向方向，依次设有一外螺纹段（45）和一第一密封面（46）；—与外螺纹接头（41）螺纹连接的内螺纹接头（51），其轴向方向上的一端具有一径向向内的内台肩（52），其轴向方向上的另一端为一外端面（53），自内台肩（52）至外端面（53）沿内螺纹接头（51）的轴向方向，依次设有一第二密封面（56）和一与外螺纹段（45）啮合的内螺纹段（55）；内端面（43）与内台肩（52）的台肩面匹配，外端面（53）与外台肩（42）的台肩面匹配；第一密封面（46）和第二密封面（56）均为斜面，且二者过盈配合密封连接。此钻杆接头具有较高的抗扭强度，较好的气密封性和重复上卸扣能力。

Description

超高抗扭金属气密封钻杆接头 发明领域
本发明涉及一种接头， 尤其涉及一种钻杆接头。 背景技术
目前，大多数用于石油钻探的钻杆都是根据 API (美国石油学会， American Petroleum Institute )所制定的标准来生产制造的。 通常石油钻探钻杆的结构是： 在钻杆管体两端各焊接一个外螺紋钻杆接头和一个内螺紋钻杆接头。
图 1显示了按照 API标准而生产制造的钻杆接头。 如图 1所示， 该钻杆接 头由外螺紋接头 1 1和与之进行螺紋连接的内螺紋接头 12组成； 其中， 外螺紋 接头 11具有外台肩 13和内端面 15 ,在外台肩 13与内端面 15之间具有外螺紋 17; 内螺紋接头 12具有外端面 14与内斜面 16, 在外端面 14与内斜面 16之间 具有内螺紋 18。
图 1所示的钻杆接头所承受的扭矩来自于外台肩 13和外端面 14之间， 以 及外螺紋 17和内螺紋 18之间所产生的摩擦力矩。 按照 API的标准， 该接头的 扭转强度一般为钻杆管体的 80 %。 但是随着石油及天然气资源的逐步消耗， 现 在的钻井技术已向着深井、 超深井、 定向井、 大位移井、 水平井等方向发展， 因此，钻杆的服役条件日趋恶劣，钻杆及其接头必须能够承受巨大的内外压力、 扭转强度和振动强度。 如果该接头在使用过程中遇到过大扭矩， 极有可能会出 现内螺紋接头胀扣或外螺紋接头螺紋断裂等故障， 从而引发钻井安全事故。
公告号为 CN2764922, 公告日为 2006年 3月 15 日， 名称为 "双台肩金属 气密封钻杆接头" 的中国专利文献提供了一种高抗扭金属气密封钻杆接头。 如 图 2所示， 该钻杆接头由外螺紋接头 21和内螺紋接头 22组成， 外螺紋接头 21 具有外台肩 23和内端面 25之间沿轴向延伸的外螺紋 27,外螺紋接头还具有在 内端面 25和外螺紋 27之间的前端锥面金属密封 20; 内螺紋接头 22具有外端 面 24与内台肩 26之间沿轴向延伸的内螺紋 28 , 内螺紋接头 22还具有在内台 肩 26和内螺紋 28之间的后端球面金属密封 29; 两金属密封之间的密封面配合 为锥面对球面配合密封。
公告号为 CN201474625 , 公告日为 2010年 5月 19 日， 名称 "一种超高抗 扭金属气密封钻杆接头" 的中国专利文献公开了一种具有超高抗扭性能的金属 气密封钻杆接头。 如图 3所示， 该钻杆接头由外螺紋接头 31和内螺紋接头 32 构成， 外螺紋接头 31 具有锥面密封面 33 , 而内螺紋接头 32具有球面密封面 34; 同时， 外螺紋接头 31还具有外螺紋 35 , 内螺紋接头 32还具有内螺紋 36; 外螺紋 35与内螺紋 36的锥度范围均为 1/12 ~ 1/20。 发明概述
本发明的目的是提供一种超高抗扭金属气密封钻杆接头， 其既要具有较高 的抗扭强度， 还要具备较强的气密封能力和较好的重复上卸扣能力。
根据上述目的，本发明提出了一种超高抗扭金属气密封钻杆接头，其包括： 一外螺紋接头， 其轴向方向上的一端具有一径向向外的外台肩， 其轴向方 向上的另一端为一内端面， 自外台肩至内端面沿外螺紋接头的轴向方向依次设 有一外螺紋段和一第一密封面；
一与所述外螺紋接头螺紋连接的内螺紋接头， 其轴向方向上的一端具有一 径向向内的内台肩， 其轴向方向上的另一端为一外端面， 自内台肩至外端面沿 内螺紋接头的轴向方向依次设有一第二密封面和一与外螺紋段啮合的内螺紋 段；
所述内端面与内台肩的台肩面匹配， 外端面与外台肩的台肩面匹配； 所述第一密封面和第二密封面均为斜面， 且二者通过过盈配合密封连接。 本技术方案中的外螺紋接头的外台肩与内端面之间的距离要大于 AP I标准 钻杆的外螺紋接头的外台肩与内端面之间的距离， 但要小于 AP I标准钻杆的内 螺紋接头的内台肩与外端面之间的距离。
进一步地， 上述内端面和内台肩的台肩面均为斜面。 该设置方式一方面可 以通过增加内外螺紋接头之间的接触面积以形成一额外摩擦力矩， 从而提高钻 杆接头的抗扭强度； 另一方面可以起到辅助密封的作用， 从而进一步提升钻杆 接头的密封性能。
更进一步地， 上述内端面和内台肩的台肩面的倾斜角度为- 15度。
进一步地， 上述内螺紋段和外螺紋段较之水平面倾斜设置。
进一步地， 上述内螺紋段和外螺紋段的倾斜锥度不大于 1： 12。 符合 API标准的接头与现有的高抗扭接头的锥度均为 1 : 6。 在本技术方案的 这种实施方式下， 内外螺紋接头采用较为平緩的锥度设计可以增加外螺紋接头 的内端面与内螺紋接头的内台肩的台肩面之间的接触面积， 以形成额外的摩擦 力矩， 从而增大了钻杆接头的抗扭强度。
优选地， 上述内螺紋段和外螺紋段的倾斜锥度为 1 : 16。
进一步地， 在上述内螺紋段与外端面之间具有一轴向延伸的镗孔。
进一步地， 在上述外台肩与外螺紋段之间具有一轴向延伸的基部。
进一步地， 上述过盈配合密封连接的过盈量为 0. 10 ~ 0. 40mm。 将过盈量设 定 0. 10 ~ 0. 40mm, 能更好地实现内外螺紋接头之间的密封配合， 强化两者之间 的密封效果。
更进一步地， 当上述外螺紋接头和内螺紋接头手动拧紧时， 内端面与内台 肩的台肩面之间具有 0 ~ 0. 5匪的间隙。 由于内外螺紋接头之间通过过盈配合密 封连接， 因此， 当人工拧紧两者时， 外螺紋接头的内端面与内螺紋接头的内台 肩有可能会存在一定微小间隙； 当超扭矩上扣或井下扭矩过大时， 外螺紋接头 的内端面与内螺紋接头的内台肩的之间的间隙会逐渐减小直至消失闭合， 这时 钻杆的接头部分形成了一个完整的刚性体， 令接头具备了较高抗扭强度和较大 抗弯能力。
与 API标准接头相比较， 本发明所述的超高抗扭金属气密封钻杆接头具有 更高的抗扭强度， 其抗扭强度比 AP I标准的接头增大了 70%左右。
与现有的高抗扭接头相比较， 本发明所述的超高抗扭金属气密封钻杆接头 仍具有相对较高的抗扭强度， 并且具有高达 lOOMpa的气密封能力， 显示出其更 加优越的气密封性能， 与此同时， 本发明所述的超高抗扭金属气密封钻杆接头 还具备良好的重复上卸扣能力。
综上所述， 本发明所述的超高抗扭金属气密封钻杆接头的抗扭强度大， 气 密封性高且重复上卸扣能力好， 能够广泛适用于深井、 超深井、 定向井、 水平 井、 大斜度井等超高难度、 情况复杂的高压气井勘探作业。 附图的简要描述
图 1为一种 API标准接头的结构示意图。 图 2为现有技术中的一种钻杆接头的结构示意图。
图 3为现有技术中的另一种钻杆接头的结构示意图。
图 4为本发明所述的一种超高抗扭金属气密封钻杆接头在一种实施方式下 的结构示意图。 发明的详细说明
下面将结合说明书附图和具体的实施例来对本发明所述的超高抗扭金属 气密封钻杆接头进行进一步地详细说明， 但是该说明并不对于本发明的技术方 案构成不当限定。
如图 4所示， 在本实施例中， 该超高抗扭金属气密封钻杆接头外径为
184.15mm, 内径为 88.9mm, 其包括外螺紋接头 41和内螺紋接头 51 , 外螺紋 接头 41和内螺紋接头 51之间通过各自的螺紋段啮合连接。
请继续参见图 4 , 在外螺紋接头的轴向方向上的一端设有径向向外的外台 肩 42 , 相对另一端设有内端面 43 , 从外台肩 42向着内端面 43的 P方向， 依 次设置有基部 44、 倾斜设置的外螺紋段 45及第一密封斜面 46; 在内螺紋接头 51的轴向方向上的一端设有径向向内的内台肩 52,相对另一端设有外端面 53 , 从内台肩 52向着外端面 53的 Q方向，依次设置有第二密封斜面 56、与外螺紋 段啮合的内螺紋段 55与镗孔 54。 其中， 第一密封斜面 46与第二密封斜面 56 均为斜面， 且过盈配合密封连接； 内端面 43与内台肩 52的台肩面斜面匹配， 倾斜角度为 -15° , 外端面 53与外台肩 42的台肩面匹配。
在本实施例中， 需要将单根钻杆连接形成较长的探井钻杆时， 通过人工用 手拧紧相邻两根钻杆， 这时外螺紋接头的内端面与内螺紋接头的内台肩的台肩 面之间的间隙为 0.15mm。
另外， 如图 4所示， 内螺紋接头 51的外端面 53到内台肩 52之间的长度 为 L4 ,外螺紋接头 41的内端面 43到外台肩 42之间的长度为 L3 ,因此， 0.15mm 的间隙即为长度 L4减去长度 L3的数值。
此外， 在本实施例中， 内螺紋段 55和外螺紋段 45的倾斜锥度为 1 : 16。 另外， 在本实施例中， 第一密封斜面 46和第二密封斜面 56之间的过盈量 为 0.20mm„ 要注意的是， 以上列举的仅为本发明的具体实施例， 显然本发明不限于以 上实施例， 随之有着许多的类似变化。 本领域的技术人员如果从本发明公开的 内容直接导出或联想到的所有变形， 均应属于本发明的保护范围。

Claims

权 利 要 求 书
1.一种超高抗扭金属气密封钻杆接头， 其包括：
一外螺紋接头， 其轴向方向上的一端具有一径向向外的外台肩， 其轴向方 向上的另一端为一内端面， 自外台肩至内端面沿外螺紋接头的轴向方向， 依次 设有一外螺紋段和一第一密封面；
一与所述外螺紋接头螺紋连接的内螺紋接头， 其轴向方向上的一端具有一 径向向内的内台肩， 其轴向方向上的另一端为一外端面， 自内台肩至外端面沿 内螺紋接头的轴向方向， 依次设有一第二密封面和一与外螺紋段啮合的内螺紋 段；
所述内端面与内台肩的台肩面匹配， 外端面与外台肩的台肩面匹配； 其特征在于：
所述第一密封面和第二密封面均为斜面， 且二者过盈配合密封连接。
2.如权利要求 1所述的超高抗扭金属气密封钻杆接头， 其特征在于， 所述 内端面与内台肩的台肩面均为斜面。
3.如权利要求 2所述的超高抗扭金属气密封钻杆接头， 其特征在于， 所述 内端面和内台肩的台肩面的倾斜角度为 - 15度。
4.如权利要求 1所述的超高抗扭金属气密封钻杆接头， 其特征在于， 所述 内螺紋段和外螺紋段较之水平面倾斜设置。
5.如权利要求 4所述的超高抗扭金属气密封钻杆接头， 其特征在于， 所述 内螺紋段和外螺紋段的倾斜锥度不大于 1： 12。
6.如权利要求 5所述的超高抗扭金属气密封钻杆接头， 其特征在于， 所述 内螺紋段和外螺紋段的倾斜锥度为 1 : 16。
7.如权利要求 1所述的超高抗扭金属气密封钻杆接头， 其特征在于， 在所 述内螺紋段与外端面之间具有一轴向延伸的镗孔。
8.如权利要求 1所述的超高抗扭金属气密封钻杆接头， 其特征在于， 在所 述外台肩与外螺紋段之间具有一轴向延伸的基部。
9.如权利要求 1所述的超高抗扭金属气密封钻杆接头， 其特征在于， 所述 过盈配合密封连接的过盈量为 0.10 ~ 0.40mm。
10. 如权利要求 1 所述的超高抗扭金属气密封钻杆接头， 其特征在于， 当所述外螺紋接头和内螺紋接头手动拧紧时， 内端面与内台肩的台肩面之间具 有 0 ~ 0.5mm的间隙。
PCT/CN2013/085552 2013-03-21 2013-10-21 超高抗扭金属气密封钻杆接头 WO2014146428A1 (zh)

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US11262005B2 (en) 2022-03-01

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