WO2019140975A1 - 用于瓦斯含量定点取样的往复式取样方法及装置 - Google Patents

用于瓦斯含量定点取样的往复式取样方法及装置 Download PDF

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Publication number
WO2019140975A1
WO2019140975A1 PCT/CN2018/112672 CN2018112672W WO2019140975A1 WO 2019140975 A1 WO2019140975 A1 WO 2019140975A1 CN 2018112672 W CN2018112672 W CN 2018112672W WO 2019140975 A1 WO2019140975 A1 WO 2019140975A1
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Prior art keywords
coal
pipe
hollow drill
core tube
sampling
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PCT/CN2018/112672
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English (en)
French (fr)
Inventor
李辉
魏建平
程磊
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河南理工大学
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Priority to AU2018403373A priority Critical patent/AU2018403373B2/en
Publication of WO2019140975A1 publication Critical patent/WO2019140975A1/zh

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
    • G01N1/08—Devices for withdrawing samples in the solid state, e.g. by cutting involving an extracting tool, e.g. core bit
    • 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
    • E21B25/06—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors the core receiver having a flexible liner or inflatable retaining means
    • 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
    • E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
    • E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/2294—Sampling soil gases or the like

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  • the invention particularly relates to a reciprocating sampling method and device for fixed-point sampling of gas content, and belongs to the technical field of geological drilling.
  • the direct measurement method for coal seam gas content mainly adopts desorption method.
  • the specific process is divided into three steps: 1 collecting coal samples in newly exposed coal wall, Shimen or rock roadway; 2 measuring natural gas desorption in underground; 3 laboratory Residual gas content determination. Among them, the 2 and 3 steps are mature, and the influence on the gas content measurement can be ignored. Since 1 involves fixed-point sampling and the calculation of gas loss is the main source of gas content measurement error.
  • the determination of gas content in underground coal mines shall be carried out by the core-core method and the fixed-point sampling method based on the orifice connection method.
  • the biggest drawback of the orifice sampling method is that the purity of the obtained coal sample is not high, and the phenomenon of "mixed sample” is serious, and fixed-point sampling cannot be achieved.
  • the core tube method quickly exits the drilling tool and sends the core tube to the bottom of the hole to drill the core.
  • the core tube and the coal seam are used for the drilling to complete the sampling.
  • the drill pipe is withdrawn. Take out the coal sample and put it into a special coal tank.
  • the method can really achieve fixed-point sampling, however, the following problems exist: the sampling takes much longer than the sampling time is not more than 5 minutes; the coal sample is exposed for a long time, and the coal core tube and the coal seam friction heat will cause coal.
  • the gas at the bottom of the target coal sample has begun to escape, and at this time, the gas escape
  • the amount of gas does not take into account the gas loss of the coal sample taken; the stability of the borehole in the soft coal seam is poor, and it is easy to deviate from the predetermined drilling path after re-drilling, which leads to the application of the coal core tube sampling method in the soft coal seam. Poor sex.
  • the present invention provides a reciprocating sampling method for fixed-point sampling of gas content, which specifically includes the following steps:
  • the hollow drill pipe with the coal core pipe fixed at the front end is drilled in sections according to the predetermined drilling path. After each drilling, the hollow drill pipe is fixed, and the coal core pipe is combined with the coal seam entering the coal core pipe. Take out along the inner hole of the hollow drill pipe and take out the rock layer from the coal core pipe, then push the coal core pipe along the inner hole of the hollow drill pipe to the front end of the hollow drill pipe and fix it, and press the predetermined hole again. The path is drilled in the next section;
  • a sealing airbag connected with an inflation pipe is arranged at the front end opening of the coal core pipe, and then the coal core pipe is pushed into the hollow drill pipe along the inner hole of the hollow drill pipe.
  • the front end is fixed and the hollow drill pipe is drilled again to the sampling length.
  • the coal sample enters the coal core tube, and the air bag at the front end of the coal core tube is inflated by the inflation pipe, and the front end of the coal core tube is sealed after the air bag is expanded;
  • the method of the present invention is to provide a core tube inside the hollow drill pipe, and the drill pipe is not used in the whole process from drilling to sampling.
  • the sampling speed can be greatly increased, and the sampling time is not more than 5 minutes.
  • the method does not need to carry out the retracting and the rod in the whole drilling process, so that the hollow drill rod can always be drilled according to the predetermined path, the accuracy of the fixed point sampling can be improved, and the coal core tube sampling method can be applied to the soft coal seam.
  • the drill pipe When the sampling point is reached, the drill pipe is still drilled, which can solve the problem that the traditional sampling method coal core tube and coal seam friction heat generation will cause the coal sample temperature to rise and deteriorate, and accelerate the coal sample gas desorption.
  • the sealing of the nozzle is achieved after the coal core tube is inflated by the airbag, which can completely prevent the gas escape during the sampling process and ensure the accuracy of the gas content determination in the coal sample.
  • the traditional coal core tube sampling method will discharge a large amount of dust during the drilling process.
  • the method adopts reciprocating drilling, and the coal powder is taken out with the coal core tube, and no dust leakage occurs in the whole process, which will not affect the working environment.
  • the present invention also provides a reciprocating sampling device for fixed-point sampling of gas content, comprising a hollow drill pipe, a coal core pipe and a coring rod;
  • the coal core tube is an open end cylinder
  • the outer diameter of the cylinder is matched with the inner diameter of the hollow drill pipe;
  • the front end of the inner side wall of the hollow drill pipe is provided with a front limit of the coal core pipe for fixing the coal core pipe and a rear limit of the coal core pipe, and the front limit of the coal core pipe
  • the position is a fixed limit, and the rear limit of the coal core tube is a one-way limit position arranged in the backward direction;
  • the core rod is a hard drill rod, and the front end of the core rod is provided with a detachable joint, and the joint is used for the joint After driving the core tube and limiting the position and connecting with the coal core tube;
  • the inner side wall of the opening of the coal core tube is provided with a ring groove, and an air bag is embedded in the ring groove, and the air bag is connected with an air tube; the air tube is connected with an inflation valve.
  • the inflation valve is disposed at a rear portion of the coal core tube.
  • the coal core tube is sleeved with a sealing bag body, and the opening direction of the sealing bag body is consistent with the opening direction of the coal core tube, and the air bag is connected with the opening of the sealing bag body.
  • the one-way limit is a limiting block elastically connected to the inner side wall of the hollow drill rod, and one end of the limiting block is an inclined surface, and the other end is a vertical surface.
  • the front limit of the coal core tube is an annular limit station disposed along the inner side wall of the hollow drill rod.
  • the rear end of the coal core tube is provided with a card joint;
  • the joint head is a cylindrical body matched with the inner hole of the hollow drill rod, the front end of the cylindrical body is open, and the front end of the cylindrical body is provided for Fast snaps for card connector connections.
  • the sampling device is used for implementing the coring method disclosed in the present invention.
  • the working principle is: when the sampling is needed, the intake pipe of the external inflation mechanism is connected with the inflation valve of the inflation tube on the coal core tube, and then the coal is taken by the core rod.
  • the core tube is pushed into the front end of the hollow drill pipe along the inner hole of the hollow drill pipe.
  • the front end of the coal core pipe first touches the limit position of the coal core pipe, and drives the coal core pipe to stop the limit action, and the coal core pipe continues. Pushing in until the rear end is in the rear limit of the core tube, the rear limit of the coal core tube is reset, which plays a fixed role on the coal core tube. At this point, the hollow drill pipe is drilled.
  • the drilling is stopped, the air bag is inflated, the air bag is expanded, and the nozzle of the coal core tube is closed, and then the connector is connected to the top of the core rod.
  • the coring rod with the connecting head is pushed along the inner hole of the hollow drill pipe, the connecting head first drives the coal core tube to limit the movement, and is connected with the card joint at the rear end of the coal core tube; finally, the core rod is connected to the coal core The tube is taken out together to complete the sampling operation.
  • Figure 1 is a schematic view showing the structure of a sampling device in the present invention.
  • a reciprocating sampling method for fixed-point sampling of gas content specifically comprising the following steps:
  • the hollow drill pipe with the coal core pipe fixed at the front end is drilled in sections according to the predetermined drilling path. After each drilling, the hollow drill pipe is fixed, and the coal core pipe is combined with the coal seam entering the coal core pipe. Take out along the inner hole of the hollow drill pipe and take out the rock layer from the coal core pipe, then push the coal core pipe along the inner hole of the hollow drill pipe to the front end of the hollow drill pipe and fix it, and press the predetermined hole again. The path is drilled in the next section;
  • a sealing airbag connected with an inflation pipe is arranged at the front end opening of the coal core pipe, and then the coal core pipe is pushed into the hollow drill pipe along the inner hole of the hollow drill pipe.
  • the front end is fixed and the hollow drill pipe is drilled again to the sampling length.
  • the coal sample enters the coal core tube, and the air bag at the front end of the coal core tube is inflated by the inflation pipe, and the front end of the coal core tube is sealed after the air bag is expanded;
  • a reciprocating sampling device for fixed-point sampling of gas content includes a hollow drill pipe 1, a core tube 2 and a coring rod 4;
  • the core tube 2 is a cylinder having an opening at one end, and a cylinder
  • the outer diameter of the body is matched with the inner diameter of the hollow drill pipe 1;
  • the front end of the inner side wall of the hollow drill pipe 1 is provided with a front limit 7 of the core tube for fixing the coal core pipe 2 and a rear limit 6 of the core tube, and the core tube
  • the front limit 7 is a fixed limit
  • the rear limit 6 of the coal core tube is a unidirectional limit disposed in the backward direction;
  • the coring rod 4 is a rigid drill rod, and the front end of the coring rod 4 is provided with a detachable
  • the connector 3 is used to drive the rear end limit 6 of the core tube and is connected to the core tube 2.
  • the inner side wall of the opening of the core tube 2 is provided with a ring groove, and the air bag 5 is embedded in the ring groove, and the air bag 5 is connected with the air tube 11; the air tube 11 is connected with the inflation valve 12.
  • the inflation valve 12 is provided at the rear of the core tube 2.
  • a sealed bag body 10 is sleeved in the core tube 2, and an opening direction of the sealing bag body 10 coincides with an opening direction of the core tube 2, and the air bag 5 is connected to an opening of the sealing bag body 10.
  • the airbag 5 is integrally connected with the sealing bag body 10, and the inflated air can completely seal the coal sample in the sealing bag body 10.
  • the one-way limit is a limit block elastically connected with the hollow drill rod, and one end of the limit block is an inclined surface, and the other end is a vertical surface.
  • the vertical plane is set toward the limit direction, and when the limit block is pushed along the vertical plane, the limit block can effectively serve as a limit position; and when the limit block is pushed along the inclined surface, the limit block can be pressed into the hollow drill pipe or coal The inner side wall of the core tube loses the limit function.
  • the coal core tube front limit 7 is an annular limit station disposed along the inner side wall of the hollow drill pipe 1.
  • the rear end of the core tube 2 is provided with a card joint 8;
  • the connecting head 3 is a cylindrical body matched with the inner hole of the hollow drill pipe 1, and the front end of the cylindrical body is provided for connection with the card joint 8.
  • Quick snap 9 When the quick catch 9 is connected to the card connector 8, the connector 3 is integrally connected to the rear end of the core tube 2.
  • the connector 3 is provided with a through hole for arranging the intake pipe to facilitate connection of the intake pipe to the inflation valve 12 on the core tube 2 at the time of sampling.
  • the connecting head 3 and the coring rod 4 can be connected by screws; the specific structure of the quick detent 9 can be in the form of a quick joint which is conventionally used in the prior art, as long as the connecting head 3 can be pushed with the core tube when being pushed.
  • the rear end of the card connector 8 is quickly connected and can be quickly disassembled after the core tube is removed.
  • the connection of the connector 3 to the core tube 2 can also be replaced by other conventional means such as screwing or magnetically absorbing connections.

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Abstract

本发明涉及一种用于瓦斯含量定点取样的往复式取样方法及取样装置，包括以下步骤：1)将前端固定有煤芯管的空心钻杆按预定钻孔路径进行分段式钻进；2)当空心钻杆钻至取样预定深度时，将煤芯管推入至空心钻杆的前端并进行固定，空心钻杆再次钻进至取样长度，煤样进入煤芯管内，对煤芯管前端的气囊充气，气囊膨胀后对煤芯管的前端密封；3)将密封后的煤芯管沿空心钻杆的内孔取出，气囊放气后将煤样从煤芯管内取出，完成定点取样。

Description

用于瓦斯含量定点取样的往复式取样方法及装置 技术领域
本发明具体涉及一种用于瓦斯含量定点取样的往复式取样方法及装置，属于地质钻探技术领域。
背景技术
目前，煤层瓦斯含量井下直接测定方法主要采用解吸法，具体过程分为三步：1在新暴露的煤壁，石门或岩石巷道打钻采集煤样；2井下自然解吸瓦斯量测定；3实验室残存瓦斯含量测定。其中2、3步理论成熟，可忽略对瓦斯含量测值产生的影响。由于1涉及定点取样方式及瓦斯损失量的计算是瓦斯含量测值误差的主要来源。煤矿井下瓦斯含量测定须采用煤芯管取芯法及基于孔口接样法的定点取样方法。孔口接样法的最大缺陷在于所取得的煤样纯度不高，“混样”现象严重，无法实现定点取样。取芯管法在取样钻孔施工完毕后快速退出钻具并将取芯管送至孔底钻进取芯，取样时依靠取芯管与煤层的摩擦钻进完成取样，取样完成后退出钻杆并取出煤样装入特制的煤罐内。该方法可以真正做到定点取样，然而存在以下几点问题：取样耗时远大于对取样用时不大于5min的规定；所取煤样一端长时间暴露，煤芯管与煤层摩擦生热会引起煤样温度升高产生变质、加速煤样瓦斯解吸的问题；钻孔施工完毕至煤芯管送至孔底的时间段内，孔底目标煤样段瓦斯已开始逸散，而此时的瓦斯逸散量并未考虑 到所取煤样的瓦斯损失量中；松软煤层中钻孔稳定性差，退钻后再次钻进很容易偏离预定钻孔路径，导致煤芯管取样法在松软煤层中的应用性较差。
发明内容
为解决上述问题，降低取样作业的劳动强度，提高取样精度和质量，本发明提供了一种用于瓦斯含量定点取样的往复式取样方法，具体包括以下步骤：
1)将前端固定有煤芯管的空心钻杆按预定钻孔路径进行分段式钻进，每段钻进后，空心钻杆固定不动，将煤芯管连同进入煤芯管中的煤层沿空心钻杆的内孔一起取出，并将岩层从煤芯管中取出后，再将煤芯管沿空心钻杆的内孔推入至空心钻杆的前端并进行固定，再次按预定钻孔路径进行下一段钻进；
2)当空心钻杆钻至取样预定深度时，在煤芯管的前端开口处设置连接有充气管路的密封用气囊，再将煤芯管沿空心钻杆的内孔推入至空心钻杆的前端并进行固定，空心钻杆再次钻进至取样长度，煤样进入煤芯管内，利用充气管路对煤芯管前端的气囊进行充气，气囊膨胀后对煤芯管的前端进行密封；
3)将密封后的煤芯管沿空心钻杆的内孔取出，气囊放气后将煤样从煤芯管内取出，完成定点取样。
本发明的方法是在空心钻杆的内部设置煤芯管，在钻孔至取样的全过程中不用退钻杆。通过对煤芯管的推入和取出操作实现取样，因而可以大幅提高取样速度，达到取样用时不大于5min的规定。本方法不用在整个钻孔过程中进行退杆和进杆，因此可以保证空心钻杆始终按预定路径进行钻孔，可以提高定 点取样的精确度，使煤芯管取样法能够适用于松软煤层。
在达到取样点时，仍然由钻杆进行钻进，可以解决传统取样法煤芯管与煤层摩擦生热会引起煤样温度升高产生变质、加速煤样瓦斯解吸的问题。在煤样进入煤芯管后，在煤芯管利用气囊充气膨胀后对管口实现密封，可以完全阻止在取样过程中的瓦斯逸散，保证煤样中瓦斯含量测定的准确性。
另外，传统的煤芯管取样法在钻孔过程中会排出大量粉尘，本方法采用往复式钻进，煤粉均随煤芯管取出，全过程均无粉尘泄漏，不会影响工作环境。
为实现本发明的取样方法，本发明还提供了一种用于瓦斯含量定点取样的往复式取样装置，包括空心钻杆、煤芯管和取芯杆；所述煤芯管为一端开口的筒体，筒体外径与空心钻杆的内径匹配；所述空心钻杆内侧壁的前端处设有用于固定煤芯管的煤芯管前限位和煤芯管后限位，煤芯管前限位为固定限位，煤芯管后限位为沿后向设置的单向限位；所述取芯杆为硬质钻杆，取芯杆的前端设有可拆卸的连接头，连接头用于驱动煤芯管后限位并与煤芯管连接；
所述煤芯管的开口处内侧壁设有环槽，环槽内嵌设有气囊，气囊连接有充气管；所述充气管连接有充气阀。
进一步的，所述充气阀设于煤芯管的后部。
进一步的，所述煤芯管内套设有密封性袋体，密封性袋体的开口方向与煤芯管的开口方向一致，所述气囊与密封性袋体的开口处连接。
进一步的，所述单向限位为与空心钻杆内侧壁弹性连接的限位块，限位块 的一端为倾斜面，另一端为垂直面。
进一步的，所述煤芯管前限位为沿空心钻杆内侧壁设置的环形限位台。
进一步的，所述煤芯管的后端设有卡接头；所述连接头为与空心钻杆的内孔相匹配的筒形体，筒形体的前端开口，筒形体的前端设有用于与所述卡接头连接的快速卡扣。
该取样装置用于实现本发明公开的取芯方法，其工作原理为：在需要取样时，将外部充气机构的进气管与煤芯管上充气管的充气阀连接，再利用取芯杆将煤芯管沿空心钻杆的内孔推入至空心钻杆的前端，煤芯管的前端首先触动煤芯管后限位，并驱动煤芯管后限位动作失去限位作用，煤芯管继续推入直至后端处于煤芯管后限位之前，煤芯管后限位复位，对煤芯管起到固定作用。此时，空心钻杆进行钻孔，煤样完全进入煤芯管后，停止钻孔，对气囊进行充气，气囊膨胀后对煤芯管的管口封闭，然后将连接头连接至取芯杆顶端，将带有连接头的取芯杆沿空心钻杆内孔推入，连接头首先驱动煤芯管后限位动作，并与煤芯管后端的卡接头连接；最后将取芯杆连通煤芯管一同取出，完成取样作业。
附图说明
图1为本发明中取样装置的结构示意图。
具体实施方式
实施例1
一种用于瓦斯含量定点取样的往复式取样方法，具体包括以下步骤：
1)将前端固定有煤芯管的空心钻杆按预定钻孔路径进行分段式钻进，每段钻进后，空心钻杆固定不动，将煤芯管连同进入煤芯管中的煤层沿空心钻杆的内孔一起取出，并将岩层从煤芯管中取出后，再将煤芯管沿空心钻杆的内孔推入至空心钻杆的前端并进行固定，再次按预定钻孔路径进行下一段钻进；
2)当空心钻杆钻至取样预定深度时，在煤芯管的前端开口处设置连接有充气管路的密封用气囊，再将煤芯管沿空心钻杆的内孔推入至空心钻杆的前端并进行固定，空心钻杆再次钻进至取样长度，煤样进入煤芯管内，利用充气管路对煤芯管前端的气囊进行充气，气囊膨胀后对煤芯管的前端进行密封；
3)将密封后的煤芯管沿空心钻杆的内孔取出，气囊放气后将煤样从煤芯管内取出，完成定点取样。
实施例2
如图1所示，一种用于瓦斯含量定点取样的往复式取样装置，包括空心钻杆1、煤芯管2和取芯杆4；所述煤芯管2为一端开口的筒体，筒体外径与空心钻杆1的内径匹配；所述空心钻杆1内侧壁的前端处设有用于固定煤芯管2的煤芯管前限位7和煤芯管后限位6，煤芯管前限位7为固定限位，煤芯管后限位6为沿后向设置的单向限位；所述取芯杆4为硬质钻杆，取芯杆4的前端设有可拆卸的连接头3，连接头3用于驱动煤芯管后限位6并与煤芯管2连接。
所述煤芯管2的开口处内侧壁设有环槽，环槽内嵌设有气囊5，气囊5连接有充气管11；所述充气管11连接有充气阀12。所述充气阀12设于煤芯管2 的后部。在气囊5未充气时，气囊5整体塌陷并紧贴于环槽内，不会影响煤样沿煤芯管2的开口进入煤芯管2内，而在气囊5以一定压力充气时，气囊5完全膨胀，并对煤芯管2的开口进行完全封闭。
所述煤芯管2内套设有密封性袋体10，密封性袋体10的开口方向与煤芯管2的开口方向一致，所述气囊5与密封性袋体10的开口处连接。气囊5与密封性袋体10连接成一体，充气膨胀后可将煤样完全密封于密封性袋体10中。
所述单向限位为与空心钻杆弹性连接的限位块，限位块的一端为倾斜面，另一端为垂直面。垂直面朝向限位向设置，沿垂直面推动限位块时，限位块可以有效起到限位作用；而沿倾斜面推动限位块时，可以将限位块压入空心钻杆或煤芯管的内侧壁，从而失去限位作用。
所述煤芯管前限位7为沿空心钻杆1内侧壁设置的环形限位台。
所述煤芯管2的后端设有卡接头8；所述连接头3为与空心钻杆1的内孔相匹配的柱形体，柱形体的前端设有用于与所述卡接头8连接的快速卡扣9。当快速卡扣9与卡接头8连接后，连接头3与煤芯管2的后端连接成一体。连接头3留设有用于布置进气管的通孔，以方便在取样时进气管与煤芯管2上的充气阀12连接。
本实施例中连接头3与取芯杆4可通过螺纹连接；快速卡扣9的具体结构可采用现有技术中惯用的快速接头形式，只要能实现连接头3在推动时能与煤芯管后端的卡接头8快速连接，并且在煤芯管取出后能够快速拆分即可。连接 头3与煤芯管2的连接形式也可采用其它惯用手段进行替换，如螺纹连接或磁吸附连接。

Claims (7)

  1. 一种用于瓦斯含量定点取样的往复式取样方法，其特征在于，包括以下步骤：
    1)将前端固定有煤芯管的空心钻杆按预定钻孔路径进行分段式钻进，每段钻进后，空心钻杆固定不动，将煤芯管连同进入煤芯管中的煤层沿空心钻杆的内孔一起取出，并将岩层从煤芯管中取出后，再将煤芯管沿空心钻杆的内孔推入至空心钻杆的前端并进行固定，再次按预定钻孔路径进行下一段钻进；
    2)当空心钻杆钻至取样预定深度时，在煤芯管的前端开口处设置连接有充气管路的密封用气囊，再将煤芯管沿空心钻杆的内孔推入至空心钻杆的前端并进行固定，空心钻杆再次钻进至取样长度，煤样进入煤芯管内，利用充气管路对煤芯管前端的气囊进行充气，气囊膨胀后对煤芯管的前端进行密封；
    3)将密封后的煤芯管沿空心钻杆的内孔取出，气囊放气后将煤样从煤芯管内取出，完成定点取样。
  2. 一种用于瓦斯含量定点取样的往复式取样，其特征在于：包括空心钻杆、煤芯管和取芯杆；所述煤芯管为一端开口的筒体，筒体外径与空心钻杆的内径匹配；所述空心钻杆内侧壁的前端处设有用于固定煤芯管的煤芯管前限位和煤芯管后限位，煤芯管前限位为固定限位，煤芯管后限位为沿后向设置的单向限位；所述取芯杆为硬质钻杆，取芯杆的前端设有可拆卸的连接头，连接头用于驱动煤芯管后限位并与煤芯管连接；
    所述煤芯管的开口处内侧壁设有环槽，环槽内嵌设有气囊，气囊连接有充气管；所述充气管连接有充气阀。
  3. 根据权利要求2所述的用于瓦斯含量定点取样的往复式取样装置，其特征在于：所述充气阀设于煤芯管的后部。
  4. 根据权利要求2或3所述的用于瓦斯含量定点取样的往复式取样装置，其特征在于：所述煤芯管内套设有密封性袋体，密封性袋体的开口方向与煤芯管的开口方向一致，所述气囊与密封性袋体的开口处连接。
  5. 根据权利要求2所述的用于瓦斯含量定点取样的往复式取样装置，其特征在于：所述单向限位为与空心钻杆弹性连接的限位块，限位块的一端为倾斜面，另一端为垂直面。
  6. 根据权利要求2所述的用于瓦斯含量定点取样的往复式取样装置，其特征在于：所述煤芯管前限位为沿空心钻杆内侧壁设置的环形限位台。
  7. 根据权利要求6所述的用于瓦斯含量定点取样的往复式取样装置，其特征在于：所述煤芯管的后端设有卡接头；所述连接头为与空心钻杆的内孔相匹配的筒形体，筒形体的前端开口，筒形体的前端设有用于与所述卡接头连接的快速卡扣。
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