WO2020063079A1 - 双壁钻杆和钻机 - Google Patents

双壁钻杆和钻机 Download PDF

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Publication number
WO2020063079A1
WO2020063079A1 PCT/CN2019/097784 CN2019097784W WO2020063079A1 WO 2020063079 A1 WO2020063079 A1 WO 2020063079A1 CN 2019097784 W CN2019097784 W CN 2019097784W WO 2020063079 A1 WO2020063079 A1 WO 2020063079A1
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WO
WIPO (PCT)
Prior art keywords
drill pipe
hole
double
walled
axial
Prior art date
Application number
PCT/CN2019/097784
Other languages
English (en)
French (fr)
Inventor
杨明
吕伟祥
韩立华
李明
马滔
曹枫
孙磊
李宽宽
Original Assignee
徐州徐工基础工程机械有限公司
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 徐州徐工基础工程机械有限公司 filed Critical 徐州徐工基础工程机械有限公司
Priority to US17/279,615 priority Critical patent/US11268328B2/en
Publication of WO2020063079A1 publication Critical patent/WO2020063079A1/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
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/003—Bearing, sealing, lubricating details
    • 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
    • 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
    • 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
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/02—Fluid rotary type drives
    • 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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/002—Drilling with diversely driven shafts extending into the borehole
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces

Definitions

  • the invention relates to the field of engineering machinery, in particular to a double-walled drill pipe and a drilling rig.
  • a rig for drilling with a double-walled drill pipe has been proposed in the prior art.
  • the rig can achieve rapid drilling, but the drilling process of this rig has a high failure rate, a short service life, and it is difficult to meet the special construction of horizontal directional drilling. demand.
  • An object of the present invention is to provide a double-walled drill pipe and a drilling rig having the same.
  • a first aspect of the present invention provides a double-walled drill pipe, including:
  • An external drill pipe includes an axial through hole and a wall surface through hole provided on a wall surface of the external drill pipe to communicate with the outside of the double wall drill pipe and the axial through hole;
  • An inner drill rod rotatably disposed in the axial through hole
  • a drill pipe sealing device is provided between the outer drill pipe and the inner drill pipe to seal a gap between the outer drill pipe and the inner drill pipe.
  • the drill pipe seal is located in the axial direction.
  • the inner drill pipe includes a guide extending from the drilling end of the double-walled drill pipe to the driving end. A flow hole, and the wall surface through hole communicates with the flow guide hole.
  • the outer drill pipe includes an outer drive shaft section located at the driving end and an outer drill pipe section located at the drilling end, and the drill pipe sealing device is disposed between the outer drive shaft section and the outer drive shaft section. Between the inner drill pipes, the wall surface through holes are arranged on the outer drill pipe sections.
  • the outer drill rod includes an outer drive shaft segment at the driving end and an outer drill rod segment at the drilling end, and the outer drive shaft segment is threadedly connected to the outer drill rod segment.
  • the inner drill pipe includes an inner drive shaft section located at the driving end and an inner drill pipe section located at the drilling end, and the drill pipe sealing device is disposed between the inner drive shaft section and the inner drive shaft section. Between the outer drill rods, the flow guide hole is provided in the inner drill rod section.
  • the inner drill rod includes an inner drive shaft segment at the driving end and an inner drill rod segment at the drilling end, and the inner drive shaft segment is plugged into the inner drill rod segment.
  • the double-walled drill pipe includes a first bearing and a second bearing, and the first bearing and the second bearing are disposed between the outer drill pipe and the inner drill pipe and located at Mentioned driver.
  • a driving end of the outer drill pipe is provided with an oil passage for injecting lubricating oil for the first bearing and the second bearing.
  • the double-walled drill pipe includes a flange, the flange is fixedly connected to the drive end face of the outer drill pipe and abuts the drive end face of the inner drill pipe.
  • the outer periphery of the rod includes a shaft shoulder at the drilling end, and the axial through hole of the outer drill rod includes a first step surface at the drilling end, and the shaft shoulder cooperates with the first step surface.
  • the diversion hole includes an axial blind hole provided in the inner drill pipe and a radial communication hole communicating with the axial blind hole, and the wall surface through-hole passes through the radial direction
  • the communication hole is in communication with the axial blind hole.
  • the drill pipe sealing device includes a first seal structure and a second seal structure disposed axially spaced from the first seal structure
  • the outer drill pipe includes a wall surface provided to communicate with the An observation hole outside the double-walled drill pipe and the axial through-hole, and the communication opening connecting the observation hole with the axial through-hole is located between the first sealing structure and the second sealing structure in the axial direction.
  • the drill pipe sealing device includes a retaining ring provided between the first sealing structure and the second sealing structure, and a perforation that communicates with the observation hole is provided on the retaining ring.
  • a second aspect of the present invention provides a drilling rig including the double-walled drill pipe according to any one of the first aspect of the present invention.
  • the wall surface through-hole is used as a fluid entry channel to connect with a high-pressure fluid source. Between the rods, the drill bit is driven to achieve drilling.
  • the drill pipe sealing device can prevent the liquid from flowing upward to affect the driving end structure (such as a bearing), thereby improving the working reliability.
  • the service life of the double-walled drill pipe and the driving end structure connected to the double-walled drill pipe can be improved.
  • FIG. 1 is a schematic structural diagram of a double-walled drill pipe according to an embodiment of the present invention.
  • orientation words such as “front, back, up, down, left, right", “horizontal, vertical, vertical, horizontal”, “top, bottom” and the like indicate the orientation Or the positional relationship is usually based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present invention and simplifying the description. Unless otherwise stated, these orientation words do not indicate and imply the device or element referred to. It must have a specific orientation or be constructed and operated in a specific orientation, so it cannot be understood as a limitation on the scope of protection of the present invention; the orientation words “inside and outside” refer to the inside and outside relative to the outline of each component itself.
  • FIG. 1 is a schematic structural diagram of a double-walled drill pipe according to an embodiment of the present invention.
  • the double-walled drill pipe of this embodiment includes an outer drill pipe 1, an inner drill pipe 2, and a drill pipe sealing device 3.
  • the outer drill pipe 1 includes an axial through hole and a wall surface through hole 12A provided on a wall surface of the outer drill pipe 1 to communicate with the outside of the double wall drill pipe and the axial through hole.
  • the inner drill rod 2 is rotatably disposed in the axial through hole.
  • the wall surface through hole 12A may be, for example, a radial through hole.
  • a drill pipe sealing device 3 is provided between the outer drill pipe 1 and the inner drill pipe 2 to seal a gap between the outer drill pipe 1 and the inner drill pipe 2.
  • the drill pipe sealing device 3 is located in the axial direction between the driving end of the double-walled drill pipe (connected to the driving device and the upper end in FIG. 1) and the communication port of the wall through hole 12A that communicates with the axial through hole.
  • a guide hole extending from the drilling end of the double-walled drill pipe (connected to the drill bit, the lower end in FIG. 1) to the driving end in the axial direction, and the wall surface through-hole 12A is in communication with the guide hole.
  • the diversion hole may include, for example, an axial blind hole 13A provided in the inner drill pipe 2 and a radial communication hole 13B communicating with the axial blind hole 13A.
  • the wall surface through hole 12A passes through the radial communication hole 13B. It communicates with the axial blind hole 13A.
  • the wall through-hole 12A is used as a fluid inlet channel to connect with a high-pressure fluid source.
  • the high-pressure fluid is injected into the diversion hole through the wall through-hole 12A and between the inner drill pipe 2 and the outer drill pipe 1.
  • the drill bit is driven to realize drilling. Advance.
  • the drill pipe sealing device 3 prevents the liquid from flowing upward to affect the driving end structure (such as a bearing), thereby improving working reliability.
  • the service life of the double-walled drill pipe and the driving end structure connected to the double-walled drill pipe can be improved.
  • the high-pressure fluid is, for example, water or mud.
  • the bit connected to the double-walled drill pipe is, for example, a roller bit.
  • the outer drill pipe 1 includes an outer drive shaft section 4 at a driving end and an outer drill pipe section 12 at a drilling end.
  • the drill pipe sealing device 3 is disposed between the outer drive shaft section 4 and the inner drill pipe 2, and a wall surface through-hole 12A is provided on the outer drill pipe section 12.
  • the outer transmission shaft section 4 is threadedly connected to the outer drill rod section 12. Different parts of the outer drill rod 1 are connected by threads, which can withstand large torque, push-pull force, and hole wall friction.
  • the inner drill rod 2 includes an inner drive shaft section 5 at a driving end and an inner drill rod section 13 at a drilling end.
  • the drill pipe sealing device 3 is arranged between the inner transmission shaft section 5 and the outer drill pipe 1.
  • a diversion hole is provided in the inner drill pipe section 13.
  • the inner transmission shaft section 5 is inserted into the inner drill rod section 13.
  • the plug structure is simple to process and easy to disassemble.
  • Each part of the inner drill pipe 2 can be inserted through a hexagonal joint, for example.
  • the double-walled drill pipe includes a first bearing 7 and a second bearing 8.
  • the first bearing 7 and the second bearing 8 are disposed between the outer drill pipe 1 and the inner drill pipe 2 and are located at the driving end.
  • the driving end of the outer drill pipe 1 is provided with a lubricant for injecting the first bearing 7 and the second bearing 8 with lubricant. Oil channel 4B.
  • the double-wall drill pipe includes a flange 6, which is fixedly connected to the driving end face of the outer drill pipe 1 and abuts against the inner drill pipe 2.
  • the outer periphery of the inner drill rod 2 includes a shaft shoulder at the drilling end, and the axial through hole of the outer drill rod 1 includes a first step surface at the drilling end, and the shaft shoulder cooperates with the first step surface.
  • the first bearing 7 and the second bearing 8 are axially spaced apart.
  • the flange 6 abuts the end of the first bearing 7, and the inner periphery of the axial through hole of the outer drill rod 1 is provided with
  • the second step surface corresponding to the first bearing 7 is in contact with the second step surface, so that the first bearing 7 is axially limited by the flange 6 and the second step surface.
  • a third step surface corresponding to the second bearing 8 is provided on the inner periphery of the axial through hole of the outer drill rod 1, and the second bearing 8 is close to the driving end. Abutting with the third step surface, an end of the second bearing 8 near the drilling end is in contact with the drill rod sealing device 3, so that the second bearing 8 is axially limited by the drill rod sealing device 3 and the third step surface.
  • the flange 6 can be fixedly connected to the end face of the driving end of the outer drill rod 1 by bolts.
  • the drill pipe sealing device 3 includes a first seal structure 11 and a second seal structure 9 axially spaced from the first seal structure 11.
  • the outer drill pipe 1 includes a double-wall drill pipe provided on a wall surface to communicate with the double-wall drill pipe.
  • the observation holes 4A of the outer and axial through-holes, and the communication openings of the observation holes 4A communicating with the axial through-holes are located between the first sealing structure 11 and the second sealing structure 9 in the axial direction.
  • the first sealing structure 11 and the second sealing structure 9 may be, for example, single or multiple rubber seal rings.
  • the observation hole 4A is a radial through hole in this embodiment.
  • the first sealing structure 11 is near the drilling end and is in direct contact with the high-pressure fluid, so it is more easily damaged.
  • high-pressure fluid will enter between the first sealing structure 11 and the second sealing structure 9.
  • the second sealing structure 9 can prevent high-pressure fluid from entering the driving end when the first sealing structure 11 is damaged.
  • the drill pipe sealing device 3 includes a retaining ring 10 provided between the first sealing structure 11 and the second sealing structure 11, and the retaining ring 10 is provided with a perforation communicating with the observation hole 4A.
  • the retaining ring 10 can ensure the axial distance between the first sealing structure 11 and the second sealing structure 11, thereby facilitating the timely observation of high-pressure fluid leakage from the observation hole 4A when the first sealing structure 11 is damaged.
  • the drill pipe sealing device 3 is located between the second bearing 8 and the end of the inner drill pipe section 13, thereby achieving axial positioning.
  • the double-walled drill pipe of the embodiment of the present invention has at least one of the following advantages: simple and durable structure, convenient maintenance, reduced manufacturing cost, and improved construction efficiency.
  • An embodiment of the present invention also provides a drilling rig, including the foregoing double-walled drill pipe.
  • the drilling rig of the embodiment of the present invention has the corresponding advantages of a double-walled drill pipe.
  • the double-walled drill pipe and drilling rig of the embodiment of the present invention are suitable for various drilling needs, for example, suitable for non-excavation horizontal directional drilling rigs.

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Abstract

一种双壁钻杆，其包括：外钻杆（1），包括轴向通孔和设置于外钻杆（1）的壁面上以连通双壁钻杆外部和轴向通孔的壁面通孔（12A）；内钻杆（2），可转动地设置于轴向通孔内；和钻杆密封装置（3），设置于外钻杆（1）和内钻杆（2）之间以密封外钻杆（1）和内钻杆（2）之间的间隙，钻杆密封装置（3）在轴向上位于驱动端与壁面通孔（12A）连通轴向通孔的连通口之间，内钻杆（2）包括从钻进端向驱动端延伸的导流孔，壁面通孔（12A）与导流孔连通，该双壁钻杆的结构增加了工作可靠性。此外，还公开了包括该双壁钻杆的钻机。

Description

双壁钻杆和钻机 技术领域
本发明涉及工程机械领域，特别涉及一种双壁钻杆和钻机。
背景技术
现有技术中已经提出了利用双壁钻杆钻进的钻机，该钻机可以实现快速钻进，但这种钻机的钻进过程中故障率高，使用寿命短，难以满足水平定向钻进特殊施工需求。
发明内容
本发明的目的在于提供一种双壁钻杆和具有该双壁钻杆的钻机。
本发明第一方面提供一种双壁钻杆，包括：
外钻杆，包括轴向通孔和设置于所述外钻杆的壁面上以连通所述双壁钻杆外部和所述轴向通孔的壁面通孔；
内钻杆，可转动地设置于所述轴向通孔内；和
钻杆密封装置，设置于所述外钻杆和所述内钻杆之间以密封所述外钻杆和所述内钻杆之间的间隙，所述钻杆密封装置在轴向上位于所述双壁钻杆的驱动端与所述壁面通孔连通所述轴向通孔的连通口之间，所述内钻杆包括从所述双壁钻杆的钻进端向驱动端延伸的导流孔，所述壁面通孔与所述导流孔连通。
在一些实施例中，所述外钻杆包括位于所述驱动端的外传动轴段和位于所述钻进端的外钻杆段，所述钻杆密封装置设置于所述外传动轴段和所述内钻杆之间，所述壁面通孔设置于所述外钻杆段上。
在一些实施例中，所述外钻杆包括位于所述驱动端的外传动轴段和位于所述钻进端的外钻杆段，所述外传动轴段与所述外钻杆段螺纹连接。
在一些实施例中，所述内钻杆包括位于所述驱动端的内传动轴段和位于所述钻进端的内钻杆段，所述钻杆密封装置设置于所述内传动轴段与所述外钻杆之间，所述导流孔设置于所述内钻杆段。
在一些实施例中，所述内钻杆包括位于所述驱动端的内传动轴段和位于所述钻进端的内钻杆段，所述内传动轴段与所述内钻杆段插接。
在一些实施例中，所述双壁钻杆包括第一轴承和第二轴承，所述第一轴承和所述第二轴承设置于所述外钻杆与所述内钻杆之间并位于所述驱动端。
在一些实施例中，所述外钻杆的驱动端设置有用于为所述第一轴承和所述第二轴承注入润滑油的油道。
在一些实施例中，所述双壁钻杆包括法兰，所述法兰固定连接于所述外钻杆的驱动端端面并抵接于所述内钻杆的驱动端端面，所述内钻杆的外周包括位于所述钻进端的轴肩，所述外钻杆的轴向通孔包括位于所述钻进端的第一台阶面，所述轴肩与所述第一台阶面配合。
在一些实施例中，所述导流孔包括设置于所述内钻杆内的轴向盲孔和与所述轴向 盲孔连通的径向连通孔，所述壁面通孔通过所述径向连通孔与所述轴向盲孔连通。
在一些实施例中，所述钻杆密封装置包括第一密封结构和与所述第一密封结构轴向间隔设置的第二密封结构，所述外钻杆包括设置于其壁面上以连通所述双壁钻杆外部和所述轴向通孔的观察孔，所述观察孔连通所述轴向通孔的连通口在轴向上位于所述第一密封结构和所述第二密封结构之间。
在一些实施例中，所述钻杆密封装置包括设置于所述第一密封结构和所述第二密封结构之间的挡圈，所述挡圈上设置有与所述观察孔连通的穿孔。
本发明第二方面提供一种钻机，包括本发明第一方面中任一项所述的双壁钻杆。
基于本发明提供的双壁钻杆和钻机，在双壁钻杆运行时，壁面通孔作为流体进入通道与高压流体源连接，高压流体通过壁面通孔注入导流孔及内钻杆与外钻杆之间，驱动钻头实现钻进。钻杆密封装置可以防止液体向上流动以影响驱动端结构(例如轴承)，从而提高工作可靠性。另外，还可提高双壁钻杆及与双壁钻杆连接的驱动端结构的寿命。
通过以下参照附图对本发明的示例性实施例的详细描述，本发明的其它特征及其优点将会变得清楚。
附图说明
此处所说明的附图用来提供对本发明的进一步理解，构成本申请的一部分，本发明的示意性实施例及其说明用于解释本发明，并不构成对本发明的不当限定。在附图中：
图1为本发明实施例的双壁钻杆的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。以下对至少一个示例性实施例的描述实际上仅仅是说明性的，决不作为对本发明及其应用或使用的任何限制。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
除非另外具体说明，否则在这些实施例中阐述的部件和步骤的相对布置、数字表达式和数值不限制本发明的范围。同时，应当明白，为了便于描述，附图中所示出的各个部分的尺寸并不是按照实际的比例关系绘制的。对于相关领域普通技术人员已知的技术、方法和设备可能不作详细讨论，但在适当情况下，所述技术、方法和设备应当被视为授权说明书的一部分。在这里示出和讨论的所有示例中，任何具体值应被解释为仅仅是示例性的，而不是作为限制。因此，示例性实施例的其它示例可以具有不同的值。应注意到：相似的标号和字母在下面的附图中表示类似项，因此，一旦某一项在一个附图中被定义，则在随后的附图中不需要对其进行进一步讨论。
在本发明的描述中，需要理解的是，使用“第一”、“第二”等词语来限定零部件，仅仅是为了便于对相应零部件进行区别，如没有另行声明，上述词语并没有特殊含义，因此不能理解为对本发明保护范围的限制。
在本发明的描述中，需要理解的是，方位词如“前、后、上、下、左、右”、“横向、竖向、垂直、水平”和“顶、底”等所指示的方位或位置关系通常是基于附图所示的方位或位置关 系，仅是为了便于描述本发明和简化描述，在未作相反说明的情况下，这些方位词并不指示和暗示所指的装置或元件必须具有特定的方位或者以特定的方位构造和操作，因此不能理解为对本发明保护范围的限制；方位词“内、外”是指相对于各部件本身的轮廓的内外。
图1为本发明实施例的双壁钻杆的结构示意图。如图1所示，该实施例的双壁钻杆包括外钻杆1、内钻杆2和钻杆密封装置3。
如图1所示，外钻杆1包括轴向通孔和设置于外钻杆1的壁面上以连通双壁钻杆外部和轴向通孔的壁面通孔12A。内钻杆2可转动地设置于轴向通孔内。壁面通孔12A例如可以为径向通孔。
钻杆密封装置3设置于外钻杆1和内钻杆2之间以密封外钻杆1和内钻杆2的间隙。钻杆密封装置3在轴向上位于双壁钻杆的驱动端(与驱动装置连接，图1中为上端)与壁面通孔12A连通轴向通孔的连通口之间，内钻杆2包括从双壁钻杆的钻进端(与钻头连接，图1中为下端)沿轴向向驱动端延伸的导流孔，壁面通孔12A与导流孔连通。
如图1所示，导流孔例如可以包括设置于内钻杆2内的轴向盲孔13A和与轴向盲孔13A连通的径向连通孔13B，壁面通孔12A通过径向连通孔13B与轴向盲孔13A连通。
在双壁钻杆运行时，壁面通孔12A作为流体进入通道与高压流体源连接，高压流体通过壁面通孔12A注入导流孔及内钻杆2与外钻杆1之间，驱动钻头实现钻进。钻杆密封装置3防止液体向上流动以影响驱动端结构(例如轴承)，从而提高工作可靠性。另外，还可提高双壁钻杆及与双壁钻杆连接的驱动端结构的寿命。
高压流体例如为水或泥浆。与双壁钻杆连接的钻头例如为牙轮钻头。
如图1所示，在一些实施例中，外钻杆1包括位于驱动端的外传动轴段4和位于钻进端的外钻杆段12。
钻杆密封装置3设置于外传动轴段4与内钻杆2之间，壁面通孔12A设置于外钻杆段12上。
如图1所示的实施例中，外传动轴段4与外钻杆段12螺纹连接。外钻杆1的不同部分通过螺纹连接，可以承受较大的扭矩、推拉力及孔壁摩擦力。
如图1所示，在一些实施例中，内钻杆2包括位于驱动端的内传动轴段5和位于钻进端的内钻杆段13。
钻杆密封装置3设置于内传动轴段5和外钻杆1之间。导流孔设置于内钻杆段13。
如图1所示，内传动轴段5与内钻杆段13插接。插接结构加工简单，拆卸方便。内钻杆2各部分例如可以通过六方接头插接。
如图1所示，双壁钻杆包括第一轴承7和第二轴承8，第一轴承7和第二轴承8设置于外钻杆1与内钻杆2之间并位于驱动端。为了润滑第一轴承7和第二轴承8，提高第一轴承7和第二轴承8的使用寿命，外钻杆1的驱动端设置有用于为第一轴承7和第二轴承8注入润滑油的油道4B。
为了使外钻杆1和内钻杆2之间实现轴向定位，双壁钻杆包括法兰6，法兰6固定连接于外钻杆1的驱动端端面并抵接于内钻杆2的驱动端端面，内钻杆2的外周包括位于钻进端的轴肩，外钻杆1的轴向通孔包括位于钻进端的第一台阶面，轴肩与第一台阶面配合。
第一轴承7和第二轴承8轴向间隔设置。为了使第一轴承7轴向定位，如图1所示，在一些实施例中，法兰6抵接于第一轴承7的端部，外钻杆1的轴向通孔内周设置有与第一轴承 7对应的第二台阶面，第一轴承7与该第二台阶面抵接，从而，第一轴承7被法兰6和第二台阶面轴向限位。为了使第二轴承8轴向限位，如图1所示，外钻杆1的轴向通孔内周设置有与第二轴承8对应的第三台阶面，第二轴承8靠近驱动端的一端与该第三台阶面抵接，第二轴承8靠近钻进端的一端与钻杆密封装置3抵接，从而第二轴承8被钻杆密封装置3和第三台阶面轴向限位。
法兰6可以通过螺栓固定连接于外钻杆1的驱动端的端面上。
如图1所示，钻杆密封装置3包括第一密封结构11和与第一密封结构11轴向间隔设置的第二密封结构9，外钻杆1包括设置于壁面上以连通双壁钻杆外部和轴向通孔的观察孔4A，观察孔4A连通轴向通孔的连通口在轴向上位于第一密封结构11和第二密封结构9之间。第一密封结构11和第二密封结构9例如可以是单道或多道橡胶密封圈。观察孔4A在本实施例中为径向通孔。
本实施例中，第一密封结构11靠近钻进端，与高压流体直接接触，因此更易损坏。当第一密封结构11受损时，高压流体将进入第一密封结构11和第二密封结构9之间，此时，可以通过观察孔4A观察双壁钻杆在钻杆密封结构3处是否泄漏及泄漏的严重程度，从而可以判断第一密封结构11是否损坏及损坏程度，以便及时维修。同时，第二密封结构9可以在第一密封结构11发生损坏时防止高压流体进入驱动端。
如图1所示，钻杆密封装置3包括设置于第一密封结构11和第二密封结构11之间的挡圈10，挡圈10上设置有与观察孔4A连通的穿孔。挡圈10能保证第一密封结构11和第二密封结构11的轴向间隔，从而利于第一密封结构11损坏时从观察孔4A能及时观察到高压流体泄漏。
如图1所示，钻杆密封装置3位于第二轴承8与内钻杆段13的端部之间，从而实现轴向定位。
根据以上描述可知，本发明实施例的双壁钻杆除前述的优点外还具有以下优点至少之一：结构简单耐用，维护便捷，制造成本降低，施工效率提高。
本发明实施例还提供一种钻机，包括前述的双壁钻杆。本发明实施例的钻机具有双壁钻杆的相应优点。
本发明实施例的双壁钻杆和钻机适于多种钻进需要，例如适于非开挖水平定向钻机。
最后应当说明的是：以上实施例仅用以说明本发明的技术方案而非对其限制；尽管参照较佳实施例对本发明进行了详细的说明，所属领域的普通技术人员应当理解：依然可以对本发明的具体实施方式进行修改或者对部分技术特征进行等同替换；而不脱离本发明技术方案的精神，其均应涵盖在本发明请求保护的技术方案范围当中。

Claims (12)

  1. 一种双壁钻杆，其特征在于，包括：
    外钻杆(1)，包括轴向通孔和设置于所述外钻杆(1)的壁面上以连通所述双壁钻杆外部和所述轴向通孔的壁面通孔(12A)；
    内钻杆(2)，可转动地设置于所述轴向通孔内；和
    钻杆密封装置(3)，设置于所述外钻杆(1)和所述内钻杆(2)之间以密封所述外钻杆(1)和所述内钻杆(2)之间的间隙，所述钻杆密封装置(3)在轴向上位于所述双壁钻杆的驱动端与所述壁面通孔(12A)连通所述轴向通孔的连通口之间，所述内钻杆(2)包括从所述双壁钻杆的钻进端向所述驱动端延伸的导流孔，所述壁面通孔(12A)与所述导流孔连通。
  2. 如权利要求1所述的双壁钻杆，其特征在于，所述外钻杆(1)包括位于所述驱动端的外传动轴段(4)和位于所述钻进端的外钻杆段(12)，所述钻杆密封装置(3)设置于所述外传动轴段(4)和所述内钻杆(2)之间，所述壁面通孔(12A)设置于所述外钻杆段(12)上。
  3. 如权利要求1所述的双壁钻杆，其特征在于，所述外钻杆(1)包括位于所述驱动端的外传动轴段(4)和位于所述钻进端的外钻杆段(12)，所述外传动轴段(4)与所述外钻杆段(12)螺纹连接。
  4. 如权利要求1所述的双壁钻杆，其特征在于，所述内钻杆(2)包括位于所述驱动端的内传动轴段(5)和位于所述钻进端的内钻杆段(13)，所述钻杆密封装置(3)设置于所述内传动轴段(5)与所述外钻杆(1)之间，所述导流孔设置于所述内钻杆段(13)。
  5. 如权利要求1所述的双壁钻杆，其特征在于，所述内钻杆(2)包括位于所述驱动端的内传动轴段(5)和位于所述钻进端的内钻杆段(13)，所述内传动轴段(5)与所述内钻杆段(13)插接。
  6. 如权利要求1所述的双壁钻杆，其特征在于，所述双壁钻杆包括第一轴承(7)和第二轴承(8)，所述第一轴承(7)和所述第二轴承(8)设置于所述外钻杆(1)与所述内钻杆(2)之间并位于所述驱动端。
  7. 如权利要求6所述的双壁钻杆，其特征在于，所述外钻杆(1)的驱动端设置有用于为所述第一轴承(7)和所述第二轴承(8)注入润滑油的油道(4B)。
  8. 如权利要求6所述的双壁钻杆，其特征在于，所述双壁钻杆包括法兰(6)，所述法兰(6)固定连接于所述外钻杆(1)的驱动端端面并抵接于所述内钻杆(2)的驱动端端面，所述内钻杆(2)的外周包括位于所述钻进端的轴肩，所述外钻杆(1)的轴向通孔包括位于所述钻进端的第一台阶面，所述轴肩与所述第一台阶面配合。
  9. 如权利要求1所述的双壁钻杆，其特征在于，所述导流孔包括设置于所述内钻杆(2)内的轴向盲孔(13A)和与所述轴向盲孔(13A)连通的径向连通孔(13B)，所述壁面通孔(12A)通过所述径向连通孔(13B)与所述轴向盲孔(13A)连通。
  10. 如权利要求1至9中任一项所述的双壁钻杆，其特征在于，所述钻杆密封装置(3)包括第一密封结构(11)和与所述第一密封结构(11)轴向间隔设置的第二密封结构(9)，所述外钻杆(2)包括设置于其壁面上以连通所述双壁钻杆外部和所述轴向通孔的观察孔(4A)，所述观察孔(4A)连通所述轴向通孔的连通口在轴向上位于所述第一密封结构(11)和所述第二密封结构(9)之间。
  11. 如权利要求10所述的双壁钻杆，其特征在于，所述钻杆密封装置(3)包括设置于所述第一密封结构(11)和所述第二密封结构(11)之间的挡圈(10)，所述挡圈(10)上设置有与 所述观察孔(4A)连通的穿孔。
  12. 一种钻机，其特征在于，包括如权利要求1至11中任一项所述的双壁钻杆。
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