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WO2020034349A1 - Hard rock coring drilling tool - Google Patents

Hard rock coring drilling tool Download PDF

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Publication number
WO2020034349A1
WO2020034349A1 PCT/CN2018/108970 CN2018108970W WO2020034349A1 WO 2020034349 A1 WO2020034349 A1 WO 2020034349A1 CN 2018108970 W CN2018108970 W CN 2018108970W WO 2020034349 A1 WO2020034349 A1 WO 2020034349A1
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WO
WIPO (PCT)
Prior art keywords
drill bit
stage blade
drilling tool
hard rock
rock core
Prior art date
Application number
PCT/CN2018/108970
Other languages
French (fr)
Chinese (zh)
Inventor
谢和平
张茹
张志龙
陈领
高明忠
鲁义强
何志强
李聪
华夏
明传剑
陆彤
彭高友
Original Assignee
四川大学
深圳大学
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 四川大学, 深圳大学 filed Critical 四川大学
Publication of WO2020034349A1 publication Critical patent/WO2020034349A1/en

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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
    • E21B10/00—Drill bits
    • E21B10/02—Core bits
    • 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
    • E21B10/00—Drill bits
    • E21B10/42—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits
    • 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
    • E21B10/00—Drill bits
    • E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
    • 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
    • E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors

Definitions

  • the invention relates to the technical field of core drilling equipment, in particular to a hard rock core drilling tool.
  • cores are important data for discovering oil and gas layers and studying formations, oil layers, reservoirs, caps, structures, etc. By observing and studying cores, you can directly understand the lithology and physical properties of underground rocks. And oily, gas, aquatic characteristics.
  • Coring is the use of special coring tools to pull underground rocks into the ground during drilling. This type of rock is called a core, which can be used to determine various properties of the rock and intuitively study the underground structure. And rock sedimentary environment, and understand the fluid properties. In the process of mineral exploration and development, it is necessary to carry out drilling according to the stratigraphic level and depth of the geological design, run core tools into the well, and drill out the rock samples.
  • the drilling tool is an indispensable tool for core extraction.
  • the existing core drills have a slower drilling speed and low core removal efficiency.
  • the core drill's blades have slow cooling speeds, fast tool wear, and the use of blades. Short life.
  • the invention aims to provide a hard rock core drilling tool, the drill bit of which has a secondary blade, which can increase the drilling speed and improve the coring efficiency; by setting a coolant circuit hole, the cooling blade can be accelerated and the service life of the blade can be extended.
  • a hard rock core drilling tool includes a hollow drill bit including a first stage blade for drilling and a second stage blade for reaming.
  • the drill bit includes an inner drill bit and an outer drill bit, the inner drill bit is installed in the outer drill bit, the first-stage blade is located at the lower end of the inner drill bit, and the second-stage blade is located on the outer wall of the outer drill bit.
  • the position of the outer drill bit corresponding to the first-stage blade has a first-stage blade avoidance gap, and the first-stage blade avoidance gap is opened at the front surface of the outer drill bit.
  • the hard rock core drilling tool further includes an outer core tube, the drill bit is installed at the lower end of the outer core tube, the outer core tube and the outer wall of the bit are provided with spiral grooves, the spiral groove on the drill bit and the spiral on the outer core tube The grooves are continuous.
  • three first-stage blades are provided at equal intervals in the circumferential direction.
  • three second-stage blades are provided at equal intervals in the circumferential direction.
  • a coolant circuit hole is provided at the first-stage blade and the second-stage blade on the drill bit.
  • the coolant circuit hole at the second-stage blade is a bar-shaped hole.
  • the coolant circuit hole at the first-stage blade is an arc-shaped hole, and the arc-shaped hole is opened at the front face of the drill.
  • a seal ring is provided on the inner wall of the drill bit, and a highly elastic hoop seal ring is used to realize the encapsulation of the rock core during the coring process, thereby achieving the isolation and quality assurance effects and achieving the goals of moisture retention and quality retention.
  • the drill is a PCD tool.
  • the present invention has the following beneficial effects:
  • the drill bit is divided into two grade blades. A small hole is first drilled by the lowermost blade, and then the hole is enlarged by the upper blade, which can increase the drilling speed and the core removal efficiency.
  • the carbide thin-lip drill is used. Cutting the rock formation, reducing the disturbance of the core formation process to ensure the core integrity and quality;
  • Through holes are set as coolant circuit holes in the blades. Coolant can be sprayed through the through holes to cool the blades, speed up the cooling speed of the blades, reduce the wear of the tools, and extend the life of the blades.
  • the outer wall of the outer core pipe is provided with a spiral groove continuous with the drill bit. As the outer core pipe is screwed into the rock formation, the outer core pipe creates a closed space for the coring tool, which can prevent the fidelity tank from being contaminated;
  • the inner wall of the drill bit is provided with a sealing ring.
  • the highly elastic annular sealing ring is used to achieve the encapsulation of the rock core during the core removal process, to achieve the isolation and quality assurance effect, and to achieve the goals of moisture retention and quality assurance.
  • Figure 1 is a schematic structural view of a drill bit
  • FIG. 2 is a schematic structural diagram of an outer drill body
  • FIG. 3 is a schematic structural diagram of an inner drilling cutter body
  • FIG. 4 is a schematic structural diagram when a drill bit is installed on an outer core tube
  • the hard rock core drilling tool disclosed in the present invention includes a hollow drill bit 1, and the drill bit 1 is a PCD cutter.
  • the drill bit 1 includes a first-stage blade 2 for drilling and a second-stage blade 3 for reaming.
  • the drill 1 includes an inner drill 11 and an outer drill 12.
  • the inner drill 11 includes a first-stage blade 2 and a hollow inner drill body 111. As shown in FIG. 3, the lower end of the inner drill body 111 is provided with a first-stage blade mounting groove 112 for installing the first-stage blade 2.
  • the first-stage blade installation groove 112 is opened at the lower end surface of the inner drill body 111.
  • the first stage blade mounting groove 112 on the body 111 is provided with a coolant circuit hole 6.
  • the coolant circuit hole 6 is an arc-shaped hole that is opened at the front face of the drill 1 and communicates with the first-stage blade mounting groove 112.
  • the inner drill body 111 is provided with three first-stage blade mounting grooves 112 at equal intervals in the circumferential direction, and each first-stage blade mounting groove 112 is provided with a coolant circuit hole 6 and each first-stage blade mounting groove 112 Each has a first-level blade 2 installed.
  • a sealing ring 8 is provided on the inner wall of the inner drill body 111, and a highly elastic annular sealing ring is used to realize the wrapping of the rock core during the core removal process, thereby achieving the isolation and quality assurance effect and achieving the goals of moisture retention and quality retention.
  • the outer drill bit 12 includes a second-stage blade 3 and a hollow outer drill body 121.
  • the outer wall of the second-stage blade 3 has a second-stage blade installation groove 122 for installing the second-stage blade 3
  • the second-stage blade installation groove 122 on the outer drill body 121 has a coolant circuit hole 6.
  • the coolant circuit hole 6 is a strip-shaped hole, and the strip-shaped hole communicates with the second-stage blade mounting groove 122.
  • the outer drill body 121 is provided with three second-stage blade mounting grooves 122 at equal intervals in the circumferential direction.
  • Each second-stage blade mounting groove 122 is provided with a coolant circuit hole 6 and each second-stage blade mounting groove 122.
  • the inner drill bit 11 is installed in the outer drill bit 12, and the outer drill body 121 has a first-stage blade avoidance gap 7 at a position corresponding to the first-stage blade 2.
  • the first-stage blade avoidance gap 7 is opened on the front surface of the outer drill bit 12.
  • the cutting edge of the first-stage blade 2 is exposed from the outer drill body 121 at a position where the first-stage blade avoids the notch 7.
  • the thickness of the blade in this embodiment is 3.2 mm.
  • the drill bit is divided into two-stage blades.
  • a small hole is first drilled by the first-stage blade 2 at the lower end, and then the hole is enlarged by the second-stage blade 3 above, which can increase the drilling speed.
  • Through-holes are provided as cooling fluid circuit holes 6 at the blade positions, and cooling fluid can be sprayed through the through-holes to cool the blades.
  • the invention uses a hard alloy sharp mouth thin lip drill bit to cut the rock formation, reduces the disturbance of the core formation to the formation, and ensures the integrity and quality of the coring.
  • the hard rock core drilling tool further includes an outer core tube 5.
  • the drill 1 is installed at the lower end of the outer core tube 5, and the upper end of the outer drill body 121 is connected to the lower end of the outer core tube 5.
  • the outer core pipe 5 and the outer wall of the outer drill body 121 are both provided with a spiral groove 4.
  • the spiral groove 4 on the outer drill body 121 is continuous with the spiral groove 4 on the outer core pipe 5.
  • An outer core tube 5 provided with a spiral groove 4 on the outer wall is equivalent to a spiral outer drill.
  • the seal ring 8 Package to prevent the fidelity compartment from being contaminated.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)

Abstract

A hard rock coring drilling tool, comprising an outer core tube (5) and a hollow drill bit (1), wherein the drill bit (1) is installed at a lower end of the outer core tube (5), outer walls of the outer core tube (5) and the drill bit (1) are each provided with a spiral groove (4), and the spiral groove (4) on the drill bit (1) and the spiral groove (4) on the outer core tube (5) are continuous; the drill bit (1) comprises an inner drill bit (11) and an outer drill bit (12), the inner drill bit (11) is installed in the outer drill bit (12), a lower end of the inner drill bit (11) has a first-stage blade (2), an outer wall of the outer drill bit (12) has a second-stage blade (3), and coolant circuit holes (6) are provided at the first-stage blade (2) and the second-stage blade (3).

Description

硬岩取芯钻具Hard rock core drill 技术领域Technical field
本发明涉及岩芯钻取设备技术领域，尤其涉及硬岩取芯钻具。The invention relates to the technical field of core drilling equipment, in particular to a hard rock core drilling tool.
背景技术Background technique
在油田勘探过程中，岩芯是发现油气层和研究地层、生油层、储油层、盖层、构造等的重要资料，通过对岩芯的观察研究，可以直接地了解地下岩层的岩性、物性和含油、气、水产状特征。油田投入开发后，要通过岩芯进一步研究和认识油层沉积特征，储层的物性、孔隙结构、润湿性、相对渗透率、岩相特征，油层物理模拟和油层水淹规律；认识和掌握不同开发阶段、不同含水阶段油层水淹特征，搞清剩余油分布，为油田开发方案设计，层系、井网调整和加密井提供科学依据。In the process of oilfield exploration, cores are important data for discovering oil and gas layers and studying formations, oil layers, reservoirs, caps, structures, etc. By observing and studying cores, you can directly understand the lithology and physical properties of underground rocks. And oily, gas, aquatic characteristics. After the oilfield is put into development, it is necessary to further study and understand the sedimentary characteristics of the reservoir through the core, the physical properties, pore structure, wettability, relative permeability, lithofacies of the reservoir, physical simulation of the reservoir, and the law of water flooding of the reservoir; recognize and master the different Water flooding characteristics of the reservoirs in the development stage and in different water-cutting stages, to clarify the distribution of remaining oil, and to provide scientific basis for the design of oilfield development schemes, layer system, well pattern adjustment, and infill wells.
取岩芯是在钻井过程中使用特殊的取芯工具把地下岩石成块地取到地面上来，这种成块的岩石叫做岩芯，通过它可以测定岩石的各种性质，直观地研究地下构造和岩石沉积环境，了解其中的流体性质等。在矿产勘探和开发过程中，需要按地质设计的地层层位和深度，开展钻进工作，向井内下入取芯工具，钻取出的岩石样品。Coring is the use of special coring tools to pull underground rocks into the ground during drilling. This type of rock is called a core, which can be used to determine various properties of the rock and intuitively study the underground structure. And rock sedimentary environment, and understand the fluid properties. In the process of mineral exploration and development, it is necessary to carry out drilling according to the stratigraphic level and depth of the geological design, run core tools into the well, and drill out the rock samples.
而钻具是取岩芯必不可少的工具，现有的取芯钻头，钻进速度较慢，取芯效率低；此外，取芯钻头的刀片冷却速度慢，刀具的磨损快，刀片的使用寿命短。The drilling tool is an indispensable tool for core extraction. The existing core drills have a slower drilling speed and low core removal efficiency. In addition, the core drill's blades have slow cooling speeds, fast tool wear, and the use of blades. Short life.
发明内容Summary of the Invention
本发明旨在提供硬岩取芯钻具，其钻头具有二级刀片，可以提高钻进速度，提高取芯效率；通过设置冷却液回路孔可以加速冷却刀片，延长刀片的使用寿命。The invention aims to provide a hard rock core drilling tool, the drill bit of which has a secondary blade, which can increase the drilling speed and improve the coring efficiency; by setting a coolant circuit hole, the cooling blade can be accelerated and the service life of the blade can be extended.
为达到上述目的，本发明采用的技术方案如下：In order to achieve the above objective, the technical solution adopted by the present invention is as follows:
硬岩取芯钻具，包括空心的钻头，所述钻头包括用于钻孔的第一级刀片和用于扩孔的第二级刀片。A hard rock core drilling tool includes a hollow drill bit including a first stage blade for drilling and a second stage blade for reaming.
进一步的，所述钻头包括内钻头和外钻头，所述内钻头安装在外钻头内，第一级刀片位于内钻头下端，第二级刀片位于外钻头外壁。Further, the drill bit includes an inner drill bit and an outer drill bit, the inner drill bit is installed in the outer drill bit, the first-stage blade is located at the lower end of the inner drill bit, and the second-stage blade is located on the outer wall of the outer drill bit.
进一步的，外钻头上对应第一级刀片的位置有第一级刀片避让缺口，第一级刀片避让缺口开口于外钻头的前端面。Further, the position of the outer drill bit corresponding to the first-stage blade has a first-stage blade avoidance gap, and the first-stage blade avoidance gap is opened at the front surface of the outer drill bit.
进一步的，硬岩取芯钻具还包括外芯管，所述钻头安装在外芯管下端，所述外芯管和钻头外壁均设有螺旋槽，钻头上的螺旋槽与外芯管上的螺旋槽连续。Further, the hard rock core drilling tool further includes an outer core tube, the drill bit is installed at the lower end of the outer core tube, the outer core tube and the outer wall of the bit are provided with spiral grooves, the spiral groove on the drill bit and the spiral on the outer core tube The grooves are continuous.
优选地，所述第一级刀片在圆周方向等间隔设有三个。Preferably, three first-stage blades are provided at equal intervals in the circumferential direction.
优选地，第二级刀片在圆周方向等间隔设有三个。Preferably, three second-stage blades are provided at equal intervals in the circumferential direction.
进一步的，钻头上第一级刀片和第二级刀片处均设有冷却液回路孔。Further, a coolant circuit hole is provided at the first-stage blade and the second-stage blade on the drill bit.
优选地，第二级刀片处的冷却液回路孔为条形孔。Preferably, the coolant circuit hole at the second-stage blade is a bar-shaped hole.
优选地，第一级刀片处的冷却液回路孔为弧形孔，弧形孔开口于钻头的前端面。Preferably, the coolant circuit hole at the first-stage blade is an arc-shaped hole, and the arc-shaped hole is opened at the front face of the drill.
进一步的，钻头内壁设有密封圈，利用高弹性的环向密封圈，实现取芯过程中对岩芯的包裹，达到隔离保质效果，达到保湿、保质目标。Further, a seal ring is provided on the inner wall of the drill bit, and a highly elastic hoop seal ring is used to realize the encapsulation of the rock core during the coring process, thereby achieving the isolation and quality assurance effects and achieving the goals of moisture retention and quality retention.
其中，钻头为PCD刀具。Among them, the drill is a PCD tool.
与现有技术相比，本发明具有以下有益效果：Compared with the prior art, the present invention has the following beneficial effects:
1，本发明中钻头分为二级刀片，由最下端的刀片首先钻小孔，再由上方的刀片扩孔，可以提高钻进速度，提高取芯效率；利用硬质合金锐口薄唇钻头切割岩层，减少取芯过程对地层的扰动，保证取芯完整度和质量；1. In the present invention, the drill bit is divided into two grade blades. A small hole is first drilled by the lowermost blade, and then the hole is enlarged by the upper blade, which can increase the drilling speed and the core removal efficiency. The carbide thin-lip drill is used. Cutting the rock formation, reducing the disturbance of the core formation process to ensure the core integrity and quality;
2，在刀片部位均设置通孔作为冷却液回路孔，冷却液可以通过该通孔喷出来冷却刀片，加快刀片的冷却速度，减少刀具的磨损，延长刀片的寿命；2. Through holes are set as coolant circuit holes in the blades. Coolant can be sprayed through the through holes to cool the blades, speed up the cooling speed of the blades, reduce the wear of the tools, and extend the life of the blades.
3，在外芯管的外壁设置有与钻头连续的螺旋槽，随着外芯管旋入岩层，外芯管给取芯工具创造一个密闭空间，可防止保真舱被污染；3. The outer wall of the outer core pipe is provided with a spiral groove continuous with the drill bit. As the outer core pipe is screwed into the rock formation, the outer core pipe creates a closed space for the coring tool, which can prevent the fidelity tank from being contaminated;
4，钻头内壁设有密封圈，利用高弹性的环向密封圈，实现取芯过程中对岩芯的包裹，达到隔离保质效果，达到保湿、保质目标。4. The inner wall of the drill bit is provided with a sealing ring. The highly elastic annular sealing ring is used to achieve the encapsulation of the rock core during the core removal process, to achieve the isolation and quality assurance effect, and to achieve the goals of moisture retention and quality assurance.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
图1是钻头的结构示意图；Figure 1 is a schematic structural view of a drill bit;
图2是外钻刀体的结构示意图；FIG. 2 is a schematic structural diagram of an outer drill body;
图3是内钻刀体的结构示意图；3 is a schematic structural diagram of an inner drilling cutter body;
图4是钻头安装在外芯管上时的结构示意图；4 is a schematic structural diagram when a drill bit is installed on an outer core tube;
图中：1-钻头、2-第一级刀片、3-第二级刀片、4-螺旋槽、5-外芯管、6-冷却液回路孔、7-第一级刀片避让缺口、8-密封圈、11-内钻头、12-外钻头、111-内钻刀体、112-第一级刀片安装槽、121-外钻刀体、122-第二级刀片安装槽。In the picture: 1-bit, 2-first stage blade, 3-second stage blade, 4-spiral groove, 5-outer core tube, 6-coolant circuit hole, 7-first stage blade avoidance gap, 8- Seal ring, 11-inner drill bit, 12-outer drill bit, 111-inner drill bit body, 112-first stage blade installation groove, 121-outer drill body, 122-second stage blade installation groove.
具体实施方式detailed description
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图，对本发明进行进一步详细说明。In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings.
如图1、2、3所示，本发明公开的硬岩取芯钻具，包括空心的钻头1，钻头1为PCD刀具。钻头1包括用于钻孔的第一级刀片2和用于扩孔的第二级刀片3。As shown in FIGS. 1, 2 and 3, the hard rock core drilling tool disclosed in the present invention includes a hollow drill bit 1, and the drill bit 1 is a PCD cutter. The drill bit 1 includes a first-stage blade 2 for drilling and a second-stage blade 3 for reaming.
钻头1包括内钻头11和外钻头12，内钻头11包括第一级刀片2和空心的内钻刀体111。如图3所示，内钻刀体111下端有用于安装第一级刀片2的第一级刀片安装槽112，第一级刀片安装槽112开口于内钻刀体111的下端面，内钻刀体111上第一级刀片安装槽112处有冷却液回路孔6，该冷却液回路孔6为弧形孔，弧形孔开口于钻头1的前端面并且与第一级刀片安装槽112连通。内钻刀体111上在圆周方向等间隔设有三个第一级刀片安装槽112，每个第一级刀片安装槽112处均设有冷却液回路孔6，每个第一级刀片安装槽112中均安装有第一级刀片2。内钻刀体111内壁设有密封圈8，利用高弹性的环向密封圈，实现取芯过程中对岩芯的包裹，达到隔离保质效果，达到保湿、保质目标。The drill 1 includes an inner drill 11 and an outer drill 12. The inner drill 11 includes a first-stage blade 2 and a hollow inner drill body 111. As shown in FIG. 3, the lower end of the inner drill body 111 is provided with a first-stage blade mounting groove 112 for installing the first-stage blade 2. The first-stage blade installation groove 112 is opened at the lower end surface of the inner drill body 111. The first stage blade mounting groove 112 on the body 111 is provided with a coolant circuit hole 6. The coolant circuit hole 6 is an arc-shaped hole that is opened at the front face of the drill 1 and communicates with the first-stage blade mounting groove 112. The inner drill body 111 is provided with three first-stage blade mounting grooves 112 at equal intervals in the circumferential direction, and each first-stage blade mounting groove 112 is provided with a coolant circuit hole 6 and each first-stage blade mounting groove 112 Each has a first-level blade 2 installed. A sealing ring 8 is provided on the inner wall of the inner drill body 111, and a highly elastic annular sealing ring is used to realize the wrapping of the rock core during the core removal process, thereby achieving the isolation and quality assurance effect and achieving the goals of moisture retention and quality retention.
外钻头12包括第二级刀片3和空心的外钻刀体121。如图2所示，第二级刀片3外壁有用于安装第二级刀片3的第二级刀片安装槽122，外钻刀体121上第二级刀片安装槽122处有冷却液回路孔6，该冷却液回路孔6为条形孔，条形孔与第二级刀片安装槽122连通。外钻刀体121上在圆周方向等间隔设有三个第二级刀片安装槽122，每个第二级刀片安装槽122处均设有冷却液回路孔6，每个第二级刀片安装槽122中均安装有第二级刀片3。The outer drill bit 12 includes a second-stage blade 3 and a hollow outer drill body 121. As shown in FIG. 2, the outer wall of the second-stage blade 3 has a second-stage blade installation groove 122 for installing the second-stage blade 3, and the second-stage blade installation groove 122 on the outer drill body 121 has a coolant circuit hole 6. The coolant circuit hole 6 is a strip-shaped hole, and the strip-shaped hole communicates with the second-stage blade mounting groove 122. The outer drill body 121 is provided with three second-stage blade mounting grooves 122 at equal intervals in the circumferential direction. Each second-stage blade mounting groove 122 is provided with a coolant circuit hole 6 and each second-stage blade mounting groove 122. Each has a second-stage blade 3 installed.
内钻头11安装在外钻头12内，外钻刀体121上对应第一级刀片2的位置有第一级刀片避让缺口7，第一级刀片避让缺口7开口于外钻头12的前端面，第一级刀片2的切削刃从第一级刀片避让缺口7处外露于外钻刀体121。本实施方式中刀片的厚度为3.2mm。The inner drill bit 11 is installed in the outer drill bit 12, and the outer drill body 121 has a first-stage blade avoidance gap 7 at a position corresponding to the first-stage blade 2. The first-stage blade avoidance gap 7 is opened on the front surface of the outer drill bit 12. The cutting edge of the first-stage blade 2 is exposed from the outer drill body 121 at a position where the first-stage blade avoids the notch 7. The thickness of the blade in this embodiment is 3.2 mm.
本发明中钻头分为二级刀片，由最下端的第一级刀片2首先钻小 孔，再由上方的第二级刀片3扩孔，可以提高钻进速度。在刀片部位均设置通孔作为冷却液回路孔6，冷却液可以通过该通孔喷出，来冷却刀片。本发明利用硬质合金锐口薄唇钻头切割岩层，减少取芯过程对地层的扰动，保证取芯完整度和质量。In the present invention, the drill bit is divided into two-stage blades. A small hole is first drilled by the first-stage blade 2 at the lower end, and then the hole is enlarged by the second-stage blade 3 above, which can increase the drilling speed. Through-holes are provided as cooling fluid circuit holes 6 at the blade positions, and cooling fluid can be sprayed through the through-holes to cool the blades. The invention uses a hard alloy sharp mouth thin lip drill bit to cut the rock formation, reduces the disturbance of the core formation to the formation, and ensures the integrity and quality of the coring.
如图4所示，在另一个实施例中硬岩取芯钻具还包括外芯管5，钻头1安装在外芯管5下端，外钻刀体121的上端与外芯管5的下端连接，外芯管5和外钻刀体121外壁均设有螺旋槽4，外钻刀体121上的螺旋槽4与外芯管5上的螺旋槽4连续。外壁设置螺旋槽4的外芯管5相当于螺旋外钻，随着外芯管5旋入岩层，外芯管5给取芯工具创造一个密闭空间，密封圈8在取芯过程中对岩芯的包裹，防止保真舱被污染。As shown in FIG. 4, in another embodiment, the hard rock core drilling tool further includes an outer core tube 5. The drill 1 is installed at the lower end of the outer core tube 5, and the upper end of the outer drill body 121 is connected to the lower end of the outer core tube 5. The outer core pipe 5 and the outer wall of the outer drill body 121 are both provided with a spiral groove 4. The spiral groove 4 on the outer drill body 121 is continuous with the spiral groove 4 on the outer core pipe 5. An outer core tube 5 provided with a spiral groove 4 on the outer wall is equivalent to a spiral outer drill. As the outer core tube 5 is screwed into the rock formation, the outer core tube 5 creates a closed space for the coring tool. The seal ring 8 Package to prevent the fidelity compartment from being contaminated.
当然，本发明还可有其它多种实施方式，在不背离本发明精神及其实质的情况下，熟悉本领域的技术人员可根据本发明作出各种相应的改变和变形，但这些相应的改变和变形都应属于本发明所附的权利要求的保护范围。Of course, the present invention may have various other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes All modifications and variations shall fall within the protection scope of the appended claims.

Claims (10)

  1. 硬岩取芯钻具，其特征在于:包括空心的钻头(1)，所述钻头(1)包括用于钻孔的第一级刀片(2)和用于扩孔的第二级刀片(3)。The hard rock core drilling tool is characterized by comprising a hollow drill bit (1), the drill bit (1) comprising a first-stage blade (2) for drilling and a second-stage blade (3) for reaming. ).
  2. 根据权利要求1所述的硬岩取芯钻具，其特征在于：所述钻头(1)包括内钻头(11)和外钻头(12)，所述内钻头(11)安装在外钻头(12)内，第一级刀片(2)位于内钻头(11)下端，第二级刀片(3)位于外钻头(12)外壁。The hard rock core drilling tool according to claim 1, wherein the drill bit (1) comprises an inner drill bit (11) and an outer drill bit (12), and the inner drill bit (11) is mounted on the outer drill bit (12) Inside, the first-stage blade (2) is located at the lower end of the inner drill (11), and the second-stage blade (3) is located on the outer wall of the outer drill (12).
  3. 根据权利要求2所述的硬岩取芯钻具，其特征在于：外钻头(12)上对应第一级刀片(2)的位置有第一级刀片避让缺口(7)，第一级刀片避让缺口(7)开口于外钻头(12)的前端面。The hard rock core drilling tool according to claim 2, characterized in that the position of the outer drill bit (12) corresponding to the first-stage blade (2) has a first-stage blade avoidance gap (7), and the first-stage blade avoidance The notch (7) is opened at the front face of the outer drill (12).
  4. 根据权利要求1或2所述的硬岩取芯钻具，其特征在于：还包括外芯管(5)，所述钻头(1)安装在外芯管(5)下端，所述外芯管(5)和钻头(1)外壁均设有螺旋槽(4)，钻头(1)上的螺旋槽(4)与外芯管(5)上的螺旋槽(4)连续。The hard rock core drilling tool according to claim 1 or 2, further comprising an outer core pipe (5), the drill bit (1) is installed at the lower end of the outer core pipe (5), and the outer core pipe ( 5) A spiral groove (4) is provided on the outer wall of the drill bit (1), and the spiral groove (4) on the drill bit (1) is continuous with the spiral groove (4) on the outer core tube (5).
  5. 根据权利要求1、2或3所述的硬岩取芯钻具，其特征在于：所述第一级刀片(2)在圆周方向等间隔设有三个。The hard rock core drilling tool according to claim 1, 2 or 3, characterized in that three first-stage blades (2) are provided at equal intervals in the circumferential direction.
  6. 根据权利要求1或2所述的硬岩取芯钻具，其特征在于：第二级刀片(3)在圆周方向等间隔设有三个。The hard rock core drilling tool according to claim 1 or 2, characterized in that three second-stage blades (3) are provided at equal intervals in the circumferential direction.
  7. 根据权利要求1或2所述的硬岩取芯钻具，其特征在于：钻头(1)上第一级刀片(2)和第二级刀片(3)处均设有冷却液回路孔(6)。The hard rock core drilling tool according to claim 1 or 2, characterized in that a coolant loop hole (6) is provided at each of the first-stage blade (2) and the second-stage blade (3) on the drill bit (1). ).
  8. 根据权利要求7所述的硬岩取芯钻具，其特征在于：第二级刀片(3)处的冷却液回路孔(6)为条形孔，第一级刀片(2)处的冷却液回路孔(6)为弧形孔，弧形孔开口于钻头(1)的前端面。The hard rock core drilling tool according to claim 7, characterized in that the coolant circuit hole (6) at the second-stage blade (3) is a strip-shaped hole, and the coolant at the first-stage blade (2) The loop hole (6) is an arc-shaped hole, and the arc-shaped hole is opened at the front end surface of the drill bit (1).
  9. 根据权利要求1或2所述的硬岩取芯钻具，其特征在于：钻头(1)内壁设有密封圈(8)。The hard rock core drilling tool according to claim 1 or 2, wherein the inner wall of the drill bit (1) is provided with a seal ring (8).
  10. 根据权利要求1或2所述的硬岩取芯钻具，其特征在于：钻头(1)为PCD刀具。The hard rock core drilling tool according to claim 1 or 2, characterized in that the drill bit (1) is a PCD cutter.
PCT/CN2018/108970 2018-08-13 2018-09-30 Hard rock coring drilling tool WO2020034349A1 (en)

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