WO2020034354A1 - 割芯装置 - Google Patents

割芯装置 Download PDF

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Publication number
WO2020034354A1
WO2020034354A1 PCT/CN2018/108975 CN2018108975W WO2020034354A1 WO 2020034354 A1 WO2020034354 A1 WO 2020034354A1 CN 2018108975 W CN2018108975 W CN 2018108975W WO 2020034354 A1 WO2020034354 A1 WO 2020034354A1
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WO
WIPO (PCT)
Prior art keywords
claws
base body
claw
annular base
cutting device
Prior art date
Application number
PCT/CN2018/108975
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English (en)
French (fr)
Inventor
陈领
谢和平
高明忠
张茹
张志龙
张泽天
赵武
华夏
明传剑
陆彤
何志强
李聪
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 WO2020034354A1 publication Critical patent/WO2020034354A1/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
    • E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors
    • 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
    • E21B25/10—Formed core retaining or severing means

Definitions

  • the invention relates to the technical field of core grabbing, and in particular to a core cutting device.
  • 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 core catcher is a key component to keep the core in the inner cylinder when the core drilling is finished.
  • the existing core catcher can only take soft rock, but it is difficult to take hard rock.
  • the invention aims to provide a core cutting device, which is provided with a claw which is gathered inwardly, which is convenient for taking hard rock.
  • the core cutting device includes a ring-shaped base body and a plurality of claws.
  • the claws are evenly arranged on the ring-shaped base body.
  • the lower end of the claw is connected to the ring-shaped base body and the upper end of the claw is folded inward.
  • the claw includes a vertical arm and an inclined arm manufactured integrally, the lower end of the vertical arm is connected to the annular base, the upper end of the vertical arm is connected to the lower end of the inclined arm, the upper end of the inclined arm is a free end, and the inclined arm is from below Tilt up and in.
  • the width of the claw gradually decreases from bottom to top.
  • the inclination angle of the inclined arm is 60 °.
  • the thickness of the claw is equal to the thickness of the annular base.
  • the claw is manufactured integrally with the annular base body.
  • annular base body is sleeved with an annular sleeve, and the annular base body is fixedly connected with the annular sleeve.
  • the annular base body is welded to the annular sleeve.
  • the present invention has the following beneficial effects:
  • the mechanical jaws designed upward and inwardly are designed in the present invention.
  • the jaws When the jaws are downward, the jaws are easily supported by the core, so that the core enters the inner cylinder.
  • the jaws When the jaws are upward, the jaws are difficult to be supported by the core.
  • the core cannot resist the large tensile force and the clamping action of the claw, the core is broken at the claw, and the fractured core will continue to go up with the claw to remain in the inner cylinder.
  • Figure 1 is a three-dimensional view of the present invention
  • Figure 2 is a sectional view of the present invention
  • FIG. 3 is a schematic diagram when the present invention is installed in an inner cylinder
  • the core cutting device disclosed in the present invention includes a ring-shaped base body 1 and a plurality of claws 2, and the claws 2 are evenly disposed on the ring-shaped base body 1. 2
  • the upper end is folded inward.
  • the number of the claws 2 can be set as required, and is not limited to the above number.
  • the claw 2 includes a vertical arm 21 and an inclined arm 22 that are integrally manufactured.
  • the lower end of the vertical arm 21 is connected to the annular base body 1.
  • the upper end of the vertical arm 21 is connected to the lower end of the inclined arm 22.
  • the upper end of the inclined arm 22 is a free end.
  • the arm 22 is inclined from the bottom up to the inside, and the inclination of the inclined arm 22 can be adjusted as required.
  • the inclination angle of the inclined arm 22 is 60 °, and the width of the claw 2 gradually decreases from bottom to top.
  • the thickness of the claw 2 is equal to the thickness of the annular base body 1, and the claw 2 and the annular base body 1 are manufactured integrally.
  • the ring-shaped base body 1 is provided with a ring-shaped sleeve 3 on the outer sleeve, and the ring-shaped base body 1 and the ring-shaped sleeve 3 are fixedly connected.
  • the lower end of the inner cylinder 4 extends to the bottom of the outer cylinder 5 and cooperates with the outer cylinder 5.
  • the drill 6 is installed at the lower end of the outer cylinder 5, and the claw 2 is installed on the inner wall of the lower end of the inner cylinder 4.
  • the inner wall of the inner cylinder 4 is provided with an annular groove adapted to the annular sleeve 3, and the annular sleeve 3 is embedded in the annular groove.
  • the free end of the claw 2 faces upward, and the free end of the claw 2 faces upward and gathers inward.
  • the core enters the inner cylinder 4 and passes through the core cutting device.
  • the claw 2 will be opened;
  • the claw 2 moves upward with the inner cylinder 4 because the free end of the claw 2 is retracted.
  • the claw 2 is difficult to be opened by the core. Because the core cannot resist a large pulling force and the inner end of the free end of the claw 2 The rock core is pulled and broken at the jaw 2, and the fractured core will continue to go up with the jaw 2 to remain in the inner cylinder 4.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (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)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Earth Drilling (AREA)

Abstract

一种割芯装置，包括环形基体（1）和多个卡爪（2），卡爪（2）均匀设置在环形基体（1）上，卡爪（2）下端与环形基体（1）连接，卡爪（2）上端向内收拢；卡爪（2）包括一体制造的竖直臂（21）和倾斜臂（22），竖直臂（21）下端与环形基体（1）连接，竖直臂（21）上端与倾斜臂（22）的下端连接，倾斜臂（22）的上端为自由端，倾斜臂（22）从下往上向内倾斜，卡爪（2）从下往上宽度逐渐变小。环形基体（1）外套装有环形套（3），环形基体（1）与环形套（3）固接。朝上并向内收拢的机械卡爪（2），当卡爪（2）下行时，卡爪（2）易被岩芯撑开，从而使岩芯进入内筒（4）中；当卡爪（2）上行时，卡爪（2）难以被岩芯撑开，由于岩芯不能抵抗较大的拉力以及卡爪（2）的夹紧作用，岩芯在卡爪（2）处被拉断，断裂的岩芯将随卡爪（2）继续上行从而保持在内筒（4）中。

Description

割芯装置 技术领域
本发明涉及岩芯抓取技术领域，尤其涉及割芯装置。
背景技术
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。
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。
捕芯器是取芯钻进结束时将岩芯保持在内筒中的关键部件，现有的捕芯器只能取软岩，难以取硬岩。
发明内容
本发明旨在提供割芯装置，设置向内收拢的卡爪，便于取硬岩。
为达到上述目的，本发明采用的技术方案如下：
割芯装置，包括环形基体和多个卡爪，卡爪均匀设置在环形基体上，卡爪下端与环形基体连接，卡爪上端向内收拢。
进一步的，卡爪包括一体制造的竖直臂和倾斜臂，所述竖直臂下端与环形基体连接，竖直臂上端与倾斜臂的下端连接，倾斜臂的上端为自由端，倾斜臂从下往上向内倾斜。
优选地，所述卡爪从下往上宽度逐渐变小。
优选地，倾斜臂的倾斜角为60°。
其中，卡爪的厚度与环形基体的厚度相等。
进一步的，卡爪与环形基体一体制造。
进一步的，环形基体外套装有环形套，环形基体与环形套固接。
其中，环形基体与环形套焊接。
进一步的，卡爪有8-15个。
优选地，卡爪有12个。
与现有技术相比，本发明具有以下有益效果：
本发明设计朝上并向内收拢的机械卡爪，当卡爪下行时，卡爪易被岩芯撑开，从而使岩芯进入内筒中；当卡爪上行时，卡爪难以被岩芯撑开，由于岩芯不能抵抗较大的拉力以及卡爪的夹紧作用，岩芯在卡爪处被拉断，断裂的岩芯将随卡爪继续上行从而保持在内筒中。
附图说明
图1是本发明的三维图；
图2是本发明的截面图；
图3是本发明安装在内筒中时的示意图；
图中：1-环形基体、2-卡爪、3-环形套、4-内筒、5-外筒、6-钻头、21-竖直臂、22-倾斜臂。
具体实施方式
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。
如图1、2所示，本发明公开的割芯装置，包括环形基体1和多个卡爪2，卡爪2均匀设置在环形基体1上，卡爪2下端与环形基体1连接，卡爪2上端向内收拢。卡爪2有8-15个，优选地，卡爪2有12个。卡爪2的个数可根据需要设置，不限于上述个数。
卡爪2包括一体制造的竖直臂21和倾斜臂22，竖直臂21下端与环形基体1连接，竖直臂21上端与倾斜臂22的下端连接，倾斜臂22的上端为自由端，倾斜臂22从下往上向内倾斜，倾斜臂22的倾斜度可以根据需要调整。本实施方式中倾斜臂22的倾斜角为60°，卡爪2从下往上宽度逐渐变小。
其中，卡爪2的厚度与环形基体1的厚度相等，卡爪2与环形基体1一体制造。环形基体1外套装有环形套3，环形基体1与环形套3固接。
如图3所示，内筒4下端伸向外筒5底部并与外筒5间隙配合，钻头6安装于外筒5下端，将卡爪2安装在内筒4下端的内壁上。具体的，在内筒4内壁设置与环形套3适配的环形槽，将环形套3嵌装在环形槽中，卡爪2的自由端朝向上方，卡爪2自由端朝上并向内收拢，当岩芯从下往上穿过硬质的卡爪2时容易被撑开，反之则难。工作时，随着钻头6的钻进，岩心进入内筒4中并从割芯装置中间穿过，在岩心穿过硬质的卡爪2时会将卡爪2撑开；停钻后，向上提拉时，卡爪2随内筒4向上移动，因为卡爪2自由端内收，此时卡爪2难以被岩心撑开，由于岩芯不能抵抗较大的拉力以及卡爪2自由端的内收夹紧，岩芯在卡爪2处被拉断，断裂的岩芯将随卡爪2继续上行从而保持在内筒4中。
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。

Claims (10)

  1. 割芯装置，其特征在于:包括环形基体(1)和多个卡爪(2)，卡爪(2)均匀设置在环形基体(1)上，卡爪(2)下端与环形基体(1)连接，卡爪(2)上端向内收拢。
  2. 根据权利要求1所述的割芯装置，其特征在于：卡爪(2)包括一体制造的竖直臂(21)和倾斜臂(22)，所述竖直臂(21)下端与环形基体(1)连接，竖直臂(21)上端与倾斜臂(22)的下端连接，倾斜臂(22)的上端为自由端，倾斜臂(22)从下往上向内倾斜。
  3. 根据权利要求1或2所述的割芯装置，其特征在于：所述卡爪(2)从下往上宽度逐渐变小。
  4. 根据权利要求2所述的割芯装置，其特征在于：倾斜臂(22)的倾斜角为60°。
  5. 根据权利要求1所述的割芯装置，其特征在于：卡爪(2)的厚度与环形基体(1)的厚度相等。
  6. 根据权利要求1或5所述的割芯装置，其特征在于：卡爪(2)与环形基体(1)一体制造。
  7. 根据权利要求1或2所述的割芯装置，其特征在于：环形基体(1)外套装有环形套(3)，环形基体(1)与环形套(3)固接。
  8. 根据权利要求7所述的割芯装置，其特征在于：环形基体(1)与环形套(3)焊接。
  9. 根据权利要求1所述的割芯装置，其特征在于：卡爪(2)有8-15个。
  10. 根据权利要求9所述的割芯装置，其特征在于：卡爪(2)有12个。
PCT/CN2018/108975 2018-08-13 2018-09-30 割芯装置 WO2020034354A1 (zh)

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CN110374511B (zh) * 2019-07-11 2020-08-07 中电建路桥集团有限公司 一种钻孔取芯钻杆
CN113236167A (zh) * 2021-03-31 2021-08-10 广东海洋大学 岩芯采样方法

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CN201818264U (zh) * 2010-04-16 2011-05-04 北京骄阳山水石油工程技术有限公司 一种取芯工具岩芯爪
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CN201818264U (zh) * 2010-04-16 2011-05-04 北京骄阳山水石油工程技术有限公司 一种取芯工具岩芯爪
CN205477476U (zh) * 2016-03-14 2016-08-17 中国石油集团西部钻探工程有限公司 松散地层取芯用岩芯爪
CN106761382A (zh) * 2016-12-20 2017-05-31 西南石油大学 一种深井取芯装置及其操作方法

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