WO2020249028A1 - 一种双流道流体注入装置 - Google Patents

一种双流道流体注入装置 Download PDF

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Publication number
WO2020249028A1
WO2020249028A1 PCT/CN2020/095466 CN2020095466W WO2020249028A1 WO 2020249028 A1 WO2020249028 A1 WO 2020249028A1 CN 2020095466 W CN2020095466 W CN 2020095466W WO 2020249028 A1 WO2020249028 A1 WO 2020249028A1
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WIPO (PCT)
Prior art keywords
channel
sealing
outer tube
hole
sealing ring
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PCT/CN2020/095466
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English (en)
French (fr)
Inventor
朱焕刚
李建成
孙浩玉
曹强
陈勇
杨德京
李宗清
王畅
宋荣荣
许萍
Original Assignee
中石化石油工程技术服务有限公司
中石化胜利石油工程有限公司
中石化胜利石油工程有限公司钻井工艺研究院
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Application filed by 中石化石油工程技术服务有限公司, 中石化胜利石油工程有限公司, 中石化胜利石油工程有限公司钻井工艺研究院 filed Critical 中石化石油工程技术服务有限公司
Priority to US17/618,008 priority Critical patent/US12049792B2/en
Publication of WO2020249028A1 publication Critical patent/WO2020249028A1/zh

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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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/18—Pipes provided with plural fluid passages
    • 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
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/14—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using liquids and gases, e.g. foams
    • 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
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/02—Surface sealing or packing
    • E21B33/03—Well heads; Setting-up thereof
    • 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
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/02—Surface sealing or packing
    • E21B33/03—Well heads; Setting-up thereof
    • E21B33/068—Well heads; Setting-up thereof having provision for introducing objects or fluids into, or removing objects from, wells

Definitions

  • the invention relates to an injection device in the field of drilling tools, in particular to a dual-channel fluid injection device for double-wall drill pipe pneumatic drilling.
  • the double-wall drill pipe pneumatic drilling technology has the following advantages compared with the traditional drill pipe pneumatic drilling technology: 1The gas and liquid are injected separately, with higher efficiency and easy control: it can be adjusted by various parameters (drilling fluid density, displacement, Double-wall drilling depth, gas volume, etc.) to obtain and control the best wellbore ECD gradient distribution; 2Do not reduce the density and displacement of drilling fluid, to better utilize the advantages of downhole speed-up tools; 3Less gas injection equipment, low pressure, and economical Good; 4Injecting pure liquid into the drill pipe can use conventional MWD for directional service.
  • the implementation of double-wall drill pipe pneumatic drilling technology is expected to greatly reduce the failure of lost circulation treatment in low-pressure and easy-leakage formations, solve the problems of safe and efficient drilling in formations with leakage and collapse and negative window, further guarantee the success rate of drilling construction, and has good promotion and application prospects .
  • the main newly added equipment for double wall drill pipe pneumatic drilling includes double wall drill pipe, dual channel fluid injection device and downhole gas-liquid mixer.
  • the upper part of the dual-channel fluid injection device On the rotary drilling rig, the upper part of the dual-channel fluid injection device is connected to the rig faucet, and the lower part is connected to the double-walled kelly; on the top drive rig, the upper part of the dual-channel fluid injection device is connected to the top drive and the lower part is connected to the double-walled drill pipe; dual-channel fluid injection During the use of the device, gas is injected from its bypass port and liquid is injected from its axial channel, which mainly realizes the injection of gas and liquid media and fluid rotation seal.
  • the current dual-channel fluid injection device has the problems of non-adjustable seal interference, short seal life, and low well control safety. These problems have become one of the key issues restricting the development of dual-wall drill pipe pneumatic drilling technology.
  • the purpose of the present invention is to provide a dual-channel fluid injection device in view of the problems existing in the prior art, and improve the sealing life and pressure rating of the dual-channel fluid injection device.
  • the upper part of the dual-channel fluid injection device is connected to the rig faucet, and the lower part is connected to the double-walled kelly.
  • the double-walled kelly includes an outer kelly and an inner cannula.
  • the inner cannula is inserted into the outer kelly to form two channels, one is The annulus A between the inner cannula and the outer kelly, the other is the inner hole A of the inner cannula.
  • a dual-channel fluid injection device comprising a main shaft, a bearing box, and a sealing box; wherein: the main shaft includes an outer tube and an inner tube.
  • the outer tube is cylindrical, and the outer tube is axially provided with a channel C communicating up and down.
  • the upper end of C is processed with a stepped hole that is recessed outward, the inner tube is round and the upper end is processed with an outward boss, the inner tube is inserted into the outer pipe channel C from top to bottom, and the lower end of the boss of the inner tube abuts against the outer tube
  • the outer edge of the boss of the inner tube is fixedly connected to the inner edge of the stepped hole of the outer tube.
  • the inner channel of the inner tube is channel B.
  • the channel B and the upper and lower through channels constitute the first fluid channel.
  • the lower part of the inner edge surface of the outer tube forms an annular hole called annulus B.
  • the lower part of the outer tube is radially processed with a hole D.
  • the hole D communicates with the annulus B to form a second fluid channel.
  • the upper and lower ends of the outer tube are respectively provided with connectors, and the lower end of the inner tube With plug-in sealing head;
  • a boss is machined on the outer edge of the upper part of the outer tube, and the bearing box is installed on the boss of the outer tube and forms a rotary seal fit with the outer tube;
  • the sealing box includes a sealing cylinder, the sealing cylinder is a cylindrical structure, is fixedly connected to the lower end of the lower end cover of the bearing box, and forms a rotary seal fit with the outer tube.
  • a channel E is radially processed at the corresponding position of the sealing cylinder and the lower channel D of the outer tube. The channel E communicates with the second fluid channel.
  • the above scheme further includes:
  • the bearing box includes an upper end cover, a lower end cover, a shell, a bearing group, an end cover sealing ring and an oil seal; wherein the upper end boss of the outer cylinder outer edge is installed with the bearing group up and down, the outer end of the bearing group is installed with the shell, and the upper and lower ends of the shell are respectively installed with the upper end Cover and lower end cover; end cover sealing rings are respectively installed between the upper end cover, lower end cover and the shell; oil seals are respectively installed between the upper end cover, lower end cover and the outer tube.
  • the sealing box also includes an upper sliding sleeve, a lower sliding sleeve, an upper sealing ring, a lower sealing ring and a sealing lower cover; wherein the sealing lower cover is installed at the lower end of the sealing cylinder, and the sealing cylinder and the sealing lower cover are sleeved on the outer edge of the outer tube
  • the middle of the sealing cylinder is radially machined with a hole E; between the inner edge surface of the sealing cylinder and the outer edge surface of the outer tube, between the hole E and the lower end cover of the bearing box, an upper sealing ring and an upper sliding sleeve are arranged, and the upper sealing ring is located on the upper
  • the upper part of the sealing cylinder is processed with a radial hole F, which communicates with the upper piston cavity;
  • the sealing ring is located at the upper end of the lower sliding sleeve; a lower piston cavity is formed between the sealing lower cover and the sealing cylinder, and the lower sliding sleeve is installed in the lower piston cavity; the lower part of the sealing cylinder is processed with a radial hole G, which communicates with the lower piston cavity; hydraulic pressure The other way of the medium reaches the channel G, and the hydraulic medium pushes the lower sliding sleeve to compress the lower sealing ring.
  • a rotary seal is installed between the upper sealing ring and the channel E, and between the lower sealing ring and the channel E.
  • the upper sealing ring and the lower sealing ring are V-shaped combined sealing rings.
  • the outer edge of the boss of the inner tube and the inner edge of the stepped hole of the outer tube are connected by threads; a sealing ring A is installed between the inner tube and the outer tube.
  • the advantages of the present invention are: 1 By adjusting the pressure of the output medium of the hydraulic station, the degree of compression of the upper and lower sliding sleeves on the upper and lower sealing rings can be adjusted, thereby adjusting the seal interference, and achieving the purpose of adjusting the rotation torque, the degree of seal wear and the pressure level 2When there is an emergency situation such as high pressure in well control, the output medium pressure of the hydraulic station can be increased to ensure the sealing and pressure bearing capacity of the bypass port and improve the safety of well control.
  • Figure 1 is a schematic structural diagram of a dual-channel fluid injection device of the present invention.
  • Embodiment 1 A dual-channel fluid injection device, comprising a main shaft 1, a bearing box 2 and a sealing box 3; wherein: the main shaft 1 includes an outer tube 10 and an inner tube 11, the outer tube 10 is cylindrical, and the outer tube 10 The inner part is axially provided with a hole C communicating up and down. The upper end of the hole C is machined with a stepped hole that is recessed outward. The inner tube 11 is a round tube, and the upper end is machined with an outward boss. The inner tube 11 is inserted into the outer tube 10 from top to bottom.
  • the lower end surface of the boss of the inner tube 11 abuts against the lower end of the stepped hole of the outer tube 10, the outer edge of the boss of the inner tube 11 is fixedly connected with the inner edge of the stepped hole of the outer tube 10, and the inner channel of the inner tube 11 is a channel B14
  • the hole B14 and the upper and lower through channels constitute the first fluid channel.
  • the lower part of the outer edge surface of the inner tube 11 and the lower part of the inner edge surface of the outer tube 10 form an annular hole called an annular gap B13.
  • the lower part of the outer tube 10 is radially machined with a hole D15, and the hole D15 and The annular gap B13 is connected to form a second fluid channel, the upper and lower ends of the outer tube 10 are respectively provided with connecting heads, and the lower end of the inner tube 11 is provided with a plug-in sealing head;
  • a boss is machined on the upper outer edge of the outer tube 10, and the bearing box 2 is mounted on the boss of the outer tube 10 and forms a rotary seal fit with the outer tube 10;
  • the sealing box 3 includes a sealing cylinder 30.
  • the sealing cylinder 30 has a cylindrical structure and is fixedly connected to the lower end of the lower end cover 21 of the bearing box, and forms a rotary sealing fit with the outer tube 10, at the corresponding position of the sealing cylinder 30 and the lower channel D15 of the outer tube 10
  • a hole E36 is machined radially, and the hole E36 is in communication with the second fluid passage.
  • Embodiment 2 Based on Embodiment 1, further includes:
  • the bearing box 2 includes an upper end cover 20, a lower end cover 21, a housing 22, a bearing group 23, an end cover sealing ring 26, and an oil seal 24; wherein, the upper end boss of the outer edge of the outer cylinder 2 is installed with the bearing group 23 up and down, and the bearing group 23
  • the housing 22 is installed at the upper and lower ends of the housing, the upper end cover 20 and the lower end cover 21 are respectively installed at the upper and lower ends; the end cover sealing ring 26 is installed between the upper end cover 20, the lower end cover 21 and the housing 22; the upper end cover 20, the lower end cover 21 and the outer tube 2 Install oil seals 25 between them.
  • the sealing box 3 further includes an upper sliding sleeve 34, a lower sliding sleeve 310, an upper sealing ring 33, a lower sealing ring 38 and a sealing lower cover 31; wherein the sealing lower cover 31 is installed at the lower end of the sealing cylinder 30, and the sealing cylinder 30 is The lower cover 31 is sleeved on the outer edge of the outer tube 2; a hole E36 is machined radially in the middle of the sealing tube 30; between the inner edge surface of the sealing tube 30 and the outer edge surface of the outer tube 2, the hole E36 and the lower end cover 21 of the bearing box An upper sealing ring 33 and an upper sliding sleeve 34 are provided.
  • the upper sealing ring 33 is located at the lower end of the upper sliding sleeve 34; an upper piston cavity is formed between the lower end cover 21 of the bearing box and the sealing cylinder 30, and the upper sliding sleeve 34 is installed in the upper piston cavity
  • the upper part of the sealing cylinder 30 is processed with a radial hole F35, which communicates with the upper piston cavity; the hydraulic medium goes all the way to the hole F35, and the hydraulic medium pushes the upper sliding sleeve 34 to compress the upper sealing ring 33; in the inner edge of the sealing cylinder 30 and the outer surface
  • a lower sealing ring 38 and a lower sliding sleeve 40 are provided between the outer edge surface of the tube 10, between the channel E36 and the sealing lower cover 31.
  • the lower sealing ring 38 is located at the upper end of the lower sliding sleeve 310; between the sealing lower cover 31 and the sealing cylinder 30 A lower piston cavity is formed, and the lower sliding sleeve 310 is installed in the lower piston cavity; the lower part of the sealing cylinder 30 is machined with a radial hole G39, which communicates with the lower piston cavity; the hydraulic medium reaches the hole G39, and the hydraulic medium pushes the lower sliding sleeve 310 Tighten the lower sealing ring 38.
  • a rotary seal is installed between the upper sealing ring 33 and the hole E36, and between the lower sealing ring 38 and the hole E36.
  • the upper sealing ring 33 and the lower sealing ring 38 are V-shaped combined sealing rings.
  • the outer edge of the boss of the inner tube 11 and the inner edge of the stepped hole of the outer tube 10 are connected by threads; a sealing ring A12 is installed between the inner tube 11 and the outer tube 10.
  • Typical embodiment 3 A dual-channel fluid injection device is connected to a rig faucet at the upper part and a double-walled kelly rod at the lower part.
  • the double-walled kelly rod includes an outer kelly and an inner cannula, and the inner cannula is inserted into the outer kelly Two holes are formed, one is the annulus A between the inner cannula and the outer kelly, and the other is the inner hole A of the inner cannula.
  • a dual-channel fluid injection device includes a main shaft 1, a bearing box 2, a sealing box 3, and a hydraulic station (not shown in the figure).
  • the main shaft 1 includes an outer tube 10 and an inner tube 11; the outer tube 10 is cylindrical, the inner tube 10 is axially machined with a hole C communicating up and down, and the upper end of the hole C is machined with a stepped hole recessed outward; the inner tube 11 is round
  • the inner tube 11 is inserted into the channel C of the outer tube 10 from top to bottom.
  • the lower end surface of the inner tube 11 abuts against the lower end surface of the stepped hole of the outer tube 10, and the inner tube 11 boss
  • the outer edge and the inner edge of the stepped hole of the outer tube 10 are fixedly connected by threads.
  • the inner channel of the inner tube 11 is channel B14, the lower part of the outer edge surface of the inner tube 11 and the lower part of the inner edge surface of the outer tube 10 form an annular channel called annulus B13.
  • a seal ring A12 and a seal ring A12 are installed between the inner tube 11 and the outer tube 10
  • the fluid in the isolating annulus B13 flows upward to prevent the fluid in the annulus B13 from flowing upward between the boss of the inner tube 11 and the stepped hole of the outer tube 10.
  • a hole D15 is machined radially at the lower part of the outer tube 10, and the hole D15 is in communication with the annular gap B13.
  • the upper end of the outer pipe 10 is connected with the rig faucet, the lower end of the outer pipe 10 is connected with the outer kelly, the upper end of the inner cannula and the lower end of the inner pipe 11 are plugged and sealed together, and the internal flow passage, channel B14 and channel A of the rig faucet form the first fluid
  • the channel, the hole D15, the annulus B13 and the annulus A form a second fluid channel.
  • a boss is processed on the outer edge of the upper end of the outer tube 10, and a bearing box 2 is installed on the boss;
  • the bearing box 2 includes an upper end cover 20, a lower end cover 21, a shell 22, a bearing group 23, an end cover sealing ring 26 and an oil seal 24; an outer cylinder 2
  • the upper end boss of the outer edge is equipped with the bearing group 23 up and down, and the outer end of the bearing group 23 is installed with the housing 22.
  • the upper and lower ends of the housing 22 are respectively installed with the upper end cover 20 and the lower end cover 21; the upper end cover 20, the lower end cover 21 and the housing 22 are respectively installed with end covers
  • the sealing ring 26; an oil seal 24 is installed between the upper end cover 20, the lower end cover 21 and the outer tube 10; the bearing box 2 and the outer tube 10 rotate relatively.
  • An oil injection cup 25 is machined and installed on the bearing box 2, and grease is injected into the oil injection cup 25 to lubricate the bearing assembly 23.
  • the sealing box 3 includes a sealing cylinder 30, an upper sliding sleeve 34, a lower sliding sleeve 310, an upper sealing ring 33, a lower sealing ring 38 and a sealing lower cover 31.
  • the sealing cylinder 30 has a cylindrical structure and is fixedly connected to the lower end of the lower end cover 21 of the bearing box.
  • the sealing lower cover 31 is installed at the lower end of the sealing cylinder 30.
  • the sealing cylinder 30 and the sealing lower cover 31 are both sleeved on the outer edge of the outer tube 2.
  • a hole E36 is machined radially in the middle of the sealing cylinder 30, and the hole E36 is in communication with the second fluid passage.
  • An upper sealing ring 33 and an upper sliding sleeve 34 are provided between the inner edge surface of the sealing cylinder 30 and the outer edge surface of the outer tube 2 and between the hole E36 and the lower end cover 21 of the bearing box.
  • the upper sealing ring 33 is located at the lower end of the upper sliding sleeve 34; an upper piston cavity is formed between the lower end cover 21 of the bearing box and the sealing cylinder 30, and the upper sliding sleeve 34 is installed in the upper piston cavity;
  • the upper part of the sealing cylinder 30 is machined with a radial hole F35,
  • the hole F35 is connected to the upper piston cavity;
  • the hydraulic station outputs hydraulic medium all the way to the hole F35, and the hydraulic medium pushes the upper sliding sleeve 34 to compress the upper sealing ring 33.
  • a lower sealing ring 38 and a lower sliding sleeve 40 are provided between the inner peripheral surface of the sealing cylinder 30 and the outer peripheral surface of the outer tube 2, and between the channel E36 and the sealing lower cover 31, and the lower sealing ring 38 is located at the upper end of the lower sliding sleeve 310;
  • a lower piston cavity is formed between the sealing lower cover 31 and the sealing cylinder 30, and the lower sliding sleeve 310 is installed in the lower piston cavity.
  • the lower part of the sealing cylinder 30 is machined with a radial hole G39, which communicates with the lower piston cavity; the hydraulic station outputs the hydraulic medium to the hole G39, and the hydraulic medium pushes the lower sliding sleeve 310 to compress the lower sealing ring 38; the upper sealing ring 33 and the lower
  • the sealing ring 38 prevents the fluid in the second fluid passage from leaking through the gap between the sealing cylinder and the outer tube.
  • the upper sealing ring 33 and the lower sealing ring 38 are V-shaped combined sealing rings.
  • a rotary seal is installed between the upper sealing ring 33 and the channel E36, and between the lower sealing ring 38 and the channel E36, which are the upper rotary seal 32 and the lower rotary seal 37; the upper rotary seal 32 and the lower rotary seal 37 are rotary grids Lay circle or rotating pan plug seal.
  • the pressure of the hydraulic medium output by the hydraulic station is adjusted, and the upper sliding sleeve 34 and the lower sliding sleeve 310 compress the upper sealing ring 33 and the lower sealing ring 38, respectively, so that the upper sealing ring 33 and the lower sealing ring 38 obtain an appropriate compression amount. It is ensured that the fluid in the second fluid channel does not leak to the outside of the sealing box 2; when the pressure in the well increases, the pressure of the hydraulic medium output by the hydraulic station is increased, so that the upper sealing ring 33 and the lower sealing ring 38 maintain good sealing capabilities.
  • the pressure of the hydraulic medium changes with the change of the pressure in the second fluid channel, which can ensure reasonable rotation torque of the sealing box 2, reduce the wear of the upper sealing ring 33 and the lower sealing ring 38, and ensure that the sealing is still reliable under sudden high pressure conditions. Sex.

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Abstract

一种双流道流体注入装置，包括主轴（1）、轴承箱（2）和密封盒（3）；其中主轴（1）包括外管（10）和内管（11），内管（11）的内部孔道与上下贯通道构成第一流体通道，内管（11）与外管（10）形成环隙，外管（10）下部径向加工有孔道D（15），孔道D（15）与环隙连通构成第二流体通道；轴承箱（2）安装在外管（10）凸台上，并与外管（10）构成旋转密封配合；密封盒（3）包括密封筒（30），固定连接在轴承箱下端盖（21）下端，并与外管（10）构成旋转密封配合，在密封筒（30）与外管孔道对应位置上径向加工有孔道E（36），孔道E（36）与第二流体通道连通。该双流道流体注入装置的液压介质压力随第二流体通道内压力的变化而变化，能够保证密封盒（3）旋转扭矩合理、降低上密封圈和下密封圈的磨损，并保证突发高压等情况下仍然能够具备很高的密封可靠性。

Description

一种双流道流体注入装置 技术领域
本发明涉及钻井工具领域中的一种注入装置，尤其涉及一种双壁钻杆充气钻井用双流道流体注入装置。
背景技术
近年来，地热钻井以及石油钻井等领域的钻井过程中，很多井都遭遇恶性失返性漏失的影响，严重制约钻井进度和地层的钻遇率。漏失地层钻井可以采用充气钻井方式予以解决，该技术从注气工艺方式上分为钻杆内充气钻井技术、套管寄生管注气技术、同心套管注气技术以及双壁钻杆注气技术等。其中双壁钻杆充气钻井技术与传统的钻杆内充气钻井技术相比具有以下优势：①气液分别注入、效率更高并且易于控制：可通过调节多种参数(钻井液密度、排量、双壁钻井下深、气量等)获得并控制最佳井筒ECD梯度分布；②不降低钻井液密度及排量，更好发挥井下提速工具优势；③所需注气设备少，压力低，经济性好；④钻杆内注入纯液相可以使用常规MWD进行定向服务。双壁钻杆充气钻井技术的实施，有望大幅减少常低压易漏地层井漏处理失效、解决漏塌同存负窗口地层安全高效钻井等难题，进一步保障钻井施工成功率，具有良好推广及应用前景。双壁钻杆充气钻井的主要新增设备包括双壁钻杆、双流道流体注入装置和井下气液混流器。在转盘钻机上，双流道流体注入装置上部连接钻机水龙头，下部连接双壁方钻杆；在顶驱钻机上，双流道流体注入装置上部连接顶驱，下部连接双壁钻杆；双流道流体注入装置使用过程中，气体从其旁通口注入，而液体从其轴向孔道注入，主要实现气液两种介质的注入和流体旋转密封。现用双流道流体注入装置存在密封过盈量不可调、密封寿命短以及井控安全性低的问题，这些问题已经成为制约双壁钻杆充气钻井技术发展的关键问题之一。
发明内容
本发明的目的就是针对现有技术存在的问题，提供一种双流道流体注入装置，提高双流道流体注入装置密封寿命和承压等级。
双流道流体注入装置上部连接钻机水龙头，下部连接双壁方钻杆，双壁方钻杆包括外方钻杆和内插管，内插管***外方钻杆的内部形成两个孔道，一个是内插管与外方钻杆之间的环隙A，另一个是内插管内部孔道A。
本发明的目的是这样实现的：
一种双流道流体注入装置，包括主轴、轴承箱和密封盒；其中：所述主轴包括外管和内管，外管呈圆筒状，外管内部轴向设有上下连通的孔道C，孔道C上端加工有向外凹陷的台阶孔，内管为圆管状，上端加工有向外的凸台，内管从上向下***外管孔道C内，内管的凸台下端面抵靠在外管台阶孔下端面，内管的凸台外缘与外管台阶孔内缘固定连接，内管的内部孔道为孔道B，孔道B与上下贯通道构成第一流体通道，内管外缘面下部与外管内缘面下部形成环形孔道为环隙B，外管下部径向加工有孔道D，孔道D与环隙B连通构成第二流体通道，外管上、下端分别设有连接头，内管下端设有插接密封头；
外管上部外缘加工有凸台，所述轴承箱安装在外管凸台上，并与外管构成旋转密封配合；
密封盒包括密封筒，密封筒为筒状结构，固定连接在轴承箱下端盖下端，并与外管构成旋转密封配合，在密封筒与外管下部孔道D对应位置上径向加工有孔道E，孔道E与第二流体通道连通。
上述方案进一步包括：
所述轴承箱包括上端盖、下端盖、外壳、轴承组、端盖密封圈和油封；其中，外筒外缘上端凸台上下安装轴承组，轴承组外端安装外壳，外壳上下端分 别安装上端盖和下端盖；上端盖、下端盖与外壳之间分别安装端盖密封圈；上端盖、下端盖与外管之间分别安装油封。
所述密封盒还包括上滑动套、下滑动套、上密封圈、下密封圈和密封下盖；其中，密封下盖安装在密封筒下端，密封筒与密封下盖套在外管的外缘上；密封筒中部径向加工有孔道E；在密封筒内缘面与外管外缘面之间，孔道E与轴承箱下端盖之间设置有上密封圈和上滑动套，上密封圈位于上滑动套下端；轴承箱下端盖与密封筒之间形成一个上活塞腔，上滑动套安装在上活塞腔里；密封筒上部加工有径向孔道F，孔道F与上活塞腔连通；液压介质一路到孔道F，液压介质推动上滑动套压紧上密封圈；在密封筒内缘面与外管外缘面之间，孔道E与密封下盖之间设置有下密封圈和下滑动套，下密封圈位于下滑动套上端；密封下盖与密封筒之间形成一个下活塞腔，下滑动套安装在下活塞腔里；密封筒下部加工有径向孔道G，孔道G与下活塞腔连通；液压介质另一路到孔道G，液压介质推动下滑动套压紧下密封圈。
所述上密封圈与孔道E之间，下密封圈与孔道E之间均再安装一道旋转密封。
上密封圈与下密封圈为V型组合密封圈。
所述内管的凸台外缘与外管台阶孔内缘通过螺纹连接；内管与外管之间安装密封圈A。
本发明的优点是：①通过调节液压站输出介质压力，可以调节上下滑动套对上下密封圈的压紧程度，从而调节密封过盈量，达到调节旋转扭矩、密封磨损程度和承压水平的目的；②当出现井控高压等紧急情况时，可以通过提高液压站输出介质压力，保证旁通口密封承压能力，提高井控安全性。
附图说明
图1是本发明一种双流道流体注入装置的结构示意图。
图中：1、主轴，2、轴承箱，3、密封盒，10、外管，11、内管，12、密封圈A，13、环隙B，14、孔道B，15、孔道D，20、上端盖，21、下端盖，22、外壳，23、轴承组，24、油封，25、压注油杯，26、端盖密封圈，30、密封筒，31、密封下盖，32、上旋转密封，33、上密封圈，34、上滑动套，35、孔道F，36、孔道E，37、下旋转密封，38、下密封圈，39、孔道G，310、下滑动套。
具体实施方式
下面结合附图对本发明作进一步描述：
实施例1：一种双流道流体注入装置，包括主轴1、轴承箱2和密封盒3；其中：所述主轴1包括外管10和内管11，外管10呈圆筒状，外管10内部轴向设有上下连通的孔道C，孔道C上端加工有向外凹陷的台阶孔，内管11为圆管状，上端加工有向外的凸台，内管11从上向下***外管10孔道C内，内管11的凸台下端面抵靠在外管10台阶孔下端面，内管11的凸台外缘与外管10台阶孔内缘固定连接，内管11的内部孔道为孔道B14，孔道B14与上下贯通道构成第一流体通道，内管11外缘面下部与外管10内缘面下部形成环形孔道为环隙B13，外管10下部径向加工有孔道D15，孔道D15与环隙B13连通构成第二流体通道，外管10上、下端分别设有连接头，内管11下端设有插接密封头；
外管10上部外缘加工有凸台，所述轴承箱2安装在外管10凸台上，并与外管10构成旋转密封配合；
密封盒3包括密封筒30，密封筒30为筒状结构，固定连接在轴承箱下端盖21下端，并与外管10构成旋转密封配合，在密封筒30与外管10下部孔道D15对应位置上径向加工有孔道E36，孔道E36与第二流体通道连通。
实施例2：基于实施例1的基础上进一步包括：
所述轴承箱2包括上端盖20、下端盖21、外壳22、轴承组23、端盖密封圈26和油封24；其中，外筒2外缘上端凸台上下安装轴承组23，轴承组23外端安装外壳22，外壳上下端分别安装上端盖20和下端盖21；上端盖20、下端盖21与外壳22之间分别安装端盖密封圈26；上端盖20、下端盖21与外管2之间分别安装油封25。
所述密封盒3还包括上滑动套34、下滑动套310、上密封圈33、下密封圈38和密封下盖31；其中，密封下盖31安装在密封筒30下端，密封筒30与密封下盖31套在外管2的外缘上；密封筒30中部径向加工有孔道E36；在密封筒30内缘面与外管2外缘面之间，孔道E36与轴承箱下端盖21之间设置有上密封圈33和上滑动套34，上密封圈33位于上滑动套34下端；轴承箱下端盖21与密封筒30之间形成一个上活塞腔，上滑动套34安装在上活塞腔里；密封筒30上部加工有径向孔道F35，孔道F35与上活塞腔连通；液压介质一路到孔道F35，液压介质推动上滑动套34压紧上密封圈33；在密封筒30内缘面与外管10外缘面之间，孔道E36与密封下盖31之间设置有下密封圈38和下滑动套40，下密封圈38位于下滑动套310上端；密封下盖31与密封筒30之间形成一个下活塞腔，下滑动套310安装在下活塞腔里；密封筒30下部加工有径向孔道G39，孔道G39与下活塞腔连通；液压介质另一路到孔道G39，液压介质推动下滑动套310压紧下密封圈38。
所述上密封圈33与孔道E36之间，下密封圈38与孔道E36之间均再安装一道旋转密封。
上密封圈33与下密封圈38为V型组合密封圈。
所述内管11的凸台外缘与外管10台阶孔内缘通过螺纹连接；内管11与外管10之间安装密封圈A12。
典型实施例3：一种双流道流体注入装置上部连接钻机水龙头，下部连接双壁方钻杆，双壁方钻杆包括外方钻杆和内插管，内插管***外方钻杆的内部形成两个孔道，一个是内插管与外方钻杆之间的环隙A，另一个是内插管内部孔道A。
参照附图1，一种双流道流体注入装置包括主轴1、轴承箱2、密封盒3和液压站(图中未示出)。主轴1包括外管10和内管11；外管10呈圆筒状，外管10内部轴向加工有上下连通的孔道C，孔道C上端加工有向外凹陷的台阶孔；内管11为圆管状，上端加工有向外的凸台；内管11从上向下***外管10孔道C内，内管11的凸台下端面抵靠在外管10台阶孔下端面，内管11的凸台外缘与外管10台阶孔内缘通过螺纹固定连接。内管11的内部孔道为孔道B14，内管11外缘面下部与外管10内缘面下部形成环形孔道为环隙B13，内管11与外管10之间安装密封圈A12，密封圈A12隔离环隙B13内的流体向上流动，防止环隙B13中流体向上流动到内管11凸台和外管10台阶孔之间。外管10下部径向加工有孔道D15，孔道D15与环隙B13连通。外管10上端与钻机水龙头连接，外管10下端与外方钻杆连接，内插管上端与内管11下端插接密封在一起，钻机水龙头内部流道、孔道B14以及孔道A形成第一流体通道，孔道D15、环隙B13和环隙A形成第二流体通道。
外管10上端外缘加工有凸台，凸台上安装轴承箱2；轴承箱2包括上端盖20、下端盖21、外壳22、轴承组23、端盖密封圈26和油封24；外筒2外缘上端凸台上下安装轴承组23，轴承组23外端安装外壳22，外壳22上下端分别安装上端盖20和下端盖21；上端盖20、下端盖21与外壳22之间分别安装端盖密封圈26；上端盖20、下端盖21与外管10之间分别安装油封24；轴承箱2与外管10之间相对旋转。轴承箱2上加工安装有压注油杯25，通过压注油杯25 注入黄油对轴承组23进行润滑。
密封盒3包括密封筒30、上滑动套34、下滑动套310、上密封圈33、下密封圈38和密封下盖31。密封筒30为筒状结构，固定连接在轴承箱下端盖21下端，密封下盖31安装在密封筒30下端，密封筒30与密封下盖31均套在外管2的外缘上。密封筒30中部径向加工有孔道E36，孔道E36与第二流体通道连通。
在密封筒30内缘面与外管2外缘面之间，以及孔道E36与轴承箱下端盖21之间设置有上密封圈33和上滑动套34。上密封圈33位于上滑动套34下端；轴承箱下端盖21与密封筒30之间形成一个上活塞腔，上滑动套34安装在上活塞腔里；密封筒30上部加工有径向孔道F35，孔道F35与上活塞腔连通；液压站输出液压介质一路到孔道F35，液压介质推动上滑动套34压紧上密封圈33。
在密封筒30内缘面与外管2外缘面之间，以及孔道E36与密封下盖31之间设置有下密封圈38和下滑动套40，下密封圈38位于下滑动套310上端；密封下盖31与密封筒30之间形成一个下活塞腔，下滑动套310安装在下活塞腔里。密封筒30下部加工有径向孔道G39，孔道G39与下活塞腔连通；液压站输出液压介质另一路到孔道G39，液压介质推动下滑动套310压紧下密封圈38；上密封圈33和下密封圈38阻止第二流体通道内流体通过密封筒和外管之间的间隙泄漏。上密封圈33与下密封圈38为V型组合密封圈。
上密封圈33与孔道E36之间，下密封圈38与孔道E36之间均再安装一道旋转密封，分别为上旋转密封32和下旋转密封37；上旋转密封32和下旋转密封37为旋转格莱圈或者旋转泛塞封。
钻井过程中，调节液压站输出液压介质压力，上滑动套34和下滑动套310分别压缩上密封圈33和下密封圈38，使得上密封圈33和下密封圈38获得一个合适的压缩量，保证第二流体通道内的流体***漏到密封盒2外部；当井内压 力增加时，增加液压站输出的液压介质压力，使得上密封圈33和下密封圈38保持良好的密封能力。液压介质压力随第二流体通道内压力的变化而变化，能够保证密封盒2旋转扭矩合理、降低上密封圈33和下密封圈38的磨损，并保证突发高压等情况下仍然能够具备密封可靠性。
尽管已经示出和描述了本发明的实施例，对于本领域的普通技术人员而言，可以理解在不脱离本发明的原理和精神的情况下可以对这些实施例进行多种变化、修改、替换和变型，本发明的范围由所附权力要求及其等同限定。

Claims (6)

  1. 一种双流道流体注入装置，包括主轴(1)、轴承箱(2)和密封盒(3)；其特征在于：所述主轴(1)包括外管(10)和内管(11)，外管(10)呈圆筒状，外管(10)内部轴向设有上下连通的孔道C，孔道C上端加工有向外凹陷的台阶孔，内管(11)为圆管状，上端加工有向外的凸台，内管(11)从上向下***外管(10)孔道C内，内管(11)的凸台下端面抵靠在外管(10)台阶孔下端面，内管(11)的凸台外缘与外管(10)台阶孔内缘固定连接，内管(11)的内部孔道为孔道B(14)，孔道B(14)与上下贯通道构成第一流体通道，内管(11)外缘面下部与外管(10)内缘面下部形成环形孔道为环隙B(13)，外管(10)下部径向加工有孔道D(15)，孔道D(15)与环隙B(13)连通构成第二流体通道，外管(10)上、下端分别设有连接头，内管(11)下端设有插接密封头；
    外管(10)上部外缘加工有凸台，所述轴承箱(2)安装在外管(10)凸台上，并与外管(10)构成旋转密封配合；
    密封盒(3)包括密封筒(30)，密封筒(30)为筒状结构，固定连接在轴承箱下端盖(21)下端，并与外管(10)构成旋转密封配合，在密封筒(30)与外管(10)下部孔道D(15)对应位置上径向加工有孔道E(36)，孔道E(36)与第二流体通道连通。
  2. 根据权利要求1所述的双流道流体注入装置，其特征在于：所述轴承箱(2)包括上端盖(20)、下端盖(21)、外壳(22)、轴承组(23)、端盖密封圈(26)和油封(24)；其中，外筒(2)外缘上端凸台上下安装轴承组(23)，轴承组(23)外端安装外壳(22)，外壳上下端分别安装上端盖(20)和下端盖(21)；上端盖(20)、下端盖(21)与外壳(22)之间分别安装端盖密封圈(26)；上端盖(20)、下端盖(21)与外管(2)之间分别安装油封(25)。
  3. 根据权利要求1或2所述的双流道流体注入装置，其特征在于：所述密封盒(3)还包括上滑动套(34)、下滑动套(310)、上密封圈(33)、下密封圈(38)和密封下盖(31)；其中，密封下盖(31)安装在密封筒(30)下端，密封筒(30)与密封下盖(31)套在外管(2)的外缘上；密封筒(30)中部径向加工有孔道E(36)；在密封筒(30)内缘面与外管(2)外缘面之间，孔道E(36)与轴承箱下端盖(21)之间设置有上密封圈(33)和上滑动套(34)，上密封圈(33)位于上滑动套(34)下端；轴承箱下端盖(21)与密封筒(30)之间形成一个上活塞腔，上滑动套(34)安装在上活塞腔里；密封筒(30)上部加工有径向孔道F(35)，孔道F(35)与上活塞腔连通；液压介质一路到孔道F(35)，液压介质推动上滑动套(34)压紧上密封圈(33)；在密封筒(30)内缘面与外管(10)外缘面之间，孔道E(36)与密封下盖(31)之间设置有下密封圈(38)和下滑动套(40)，下密封圈(38)位于下滑动套(310)上端；密封下盖(31)与密封筒(30)之间形成一个下活塞腔，下滑动套(310)安装在下活塞腔里；密封筒(30)下部加工有径向孔道G(39)，孔道G(39)与下活塞腔连通；液压介质另一路到孔道G(39)，液压介质推动下滑动套(310)压紧下密封圈(38)。
  4. 根据权利要求3所述的双流道流体注入装置，其特征在于：所述上密封圈(33)与孔道E(36)之间，下密封圈(38)与孔道E(36)之间均再安装一道旋转密封。
  5. 根据权利要求4所述的双流道流体注入装置，其特征在于：上密封圈(33)与下密封圈(38)为V型组合密封圈。
  6. 根据权利要求1所述的双流道流体注入装置，其特征在于：所述内管(11)的凸台外缘与外管(10)台阶孔内缘通过螺纹连接；内管(11)与外管(10)之间安装密封圈A(12)。
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