WO2016112759A1 - 一种钻孔内热驱替式强化抽采方法 - Google Patents

一种钻孔内热驱替式强化抽采方法 Download PDF

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WO2016112759A1
WO2016112759A1 PCT/CN2015/096789 CN2015096789W WO2016112759A1 WO 2016112759 A1 WO2016112759 A1 WO 2016112759A1 CN 2015096789 W CN2015096789 W CN 2015096789W WO 2016112759 A1 WO2016112759 A1 WO 2016112759A1
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pipe
heat
borehole
hole
thermal
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PCT/CN2015/096789
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English (en)
French (fr)
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林柏泉
洪溢都
朱传杰
姚昊
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中国矿业大学
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Priority to US15/323,272 priority Critical patent/US9869168B2/en
Priority to AU2015377012A priority patent/AU2015377012B2/en
Publication of WO2016112759A1 publication Critical patent/WO2016112759A1/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
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
    • 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
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
    • E21B33/14—Methods or devices for cementing, for plugging holes, crevices or the like for cementing casings into boreholes
    • 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
    • E21B36/00—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
    • 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
    • E21B36/00—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
    • E21B36/04—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones using electrical heaters
    • 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
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells

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  • the invention relates to a thermal flooding enhanced drainage method in a borehole, and is particularly suitable for gas efficient extraction of a high gas and low permeability coal seam in a coal mine.
  • the basic means of gas control in underground coal mines in China is the gas drainage measures based on the method of drilling gas drainage.
  • the low permeability of coal seams has gradually become the main controlling factor for efficient gas drainage. Therefore, strengthening the anti-reflection has become a key technology to improve the gas drainage effect and achieve deep coal and gas co-production.
  • intensive anti-reflection technologies There are mainly two types of intensive anti-reflection technologies mainly used.
  • One is a method in which a fluid machine and a fluid medium are combined to treat a coal body, such as hydraulic slitting, hydraulic fracturing, etc., and the other is an explosive explosion method. Cause the coal body to crack.
  • Both methods can increase the permeability of the coal seam and improve the gas drainage effect, but still have their own limitations.
  • hydraulic cutting, hydraulic fracturing and other methods there will be water lock effect and other methods to suppress gas analysis;
  • explosives and other methods there is costly charging, and the explosive itself is a dangerous source, and there is a certain safety for underground production. Threat. Therefore, it is necessary to find a safe and reliable, time-saving and labor-saving, simple and easy to implement and cost-effective strengthening measures, which is of great significance to improve mine gas drainage efficiency and prevent coal and gas outburst.
  • the object of the present invention is to overcome the deficiencies in the prior art and to provide a method for intensive drilling and drainage in a borehole that is safe, reliable, time-saving, labor-saving, simple and inexpensive.
  • the method for intensifying the excavation in the borehole of the present invention including through-drilling or bedding drilling, spacing a plurality of holes of the pumping holes in the coal seam; Sealing and paralleling into the gas extraction pipe network for gas drainage; the steps are as follows:
  • multiple heat-displaced drill holes are arranged at intervals in a plurality of pumping boreholes, and the heat-displaced drill holes are alternately arranged with the drill holes;
  • the thermal drive for the drill hole, exit the drill pipe, and then send the grouting pipe, the slurry return pipe, the heat pipe and the pumping pipe to the hot drive, and connect the exposed end of the grouting pipe with the grouting pump.
  • the exposed end of the extraction pipe is connected to the gas drainage pipe network, and a heating device is installed on the exposed section of the heat pipe;
  • the present invention utilizes a heat pipe to continuously release heat in a borehole, and continuously heats the coal body or the surrounding coal body in the borehole to form a higher temperature field.
  • the law of gas adsorption reduction occurs when the coal temperature rises, thereby promoting the desorption of gas and achieving the purpose of strengthening gas drainage, significantly expanding the effective pressure relief range of single holes, and improving the gas drainage efficiency of coal seam by more than 40%.
  • the method is safe and reliable, low in cost, simple and easy to operate, saves time and labor, and has wide practicality.
  • FIG. 1 is a schematic view of a method for enhancing thermal drainage in a borehole according to the present invention
  • FIG. 2 is a schematic view showing the staggered arrangement of the extraction drilling holes and the thermal displacement drilling holes of the present invention.
  • the borehole internal thermal flooding enhanced drainage method of the present invention comprises a through-hole drilling or a bedding drilling:
  • the heating device 4 After the end of the sealing, the heating device 4 is started, the heat pipe 5 starts to work, the heat pipe absorbs heat from the heating device, releases heat in the borehole, and releases heat in the borehole by continuously driving the heat to the borehole, thereby improving the borehole. And the temperature of the coal around the borehole, promote the gas analysis of the coal in the area, and then achieve the thermal flooding enhanced pumping;
  • the distance between the extraction drilling hole and the thermal drive for the end of the drilling end is 6-8 m; when drilling the bedding layer, the drilling hole and the thermal drive replace the drilling hole end.
  • the center connection distance is 3 to 5 m.
  • the heating device adopts a water circulation heating method or an electric heating tube heating method.
  • the heating device is a closed container, and after the explosion-proof treatment, the heating element is immersed in the water and passed through The hot water further heats the heat pipe or is isolated from the surrounding environment, and heats the heat pipe by heat radiation and heat convection, has no direct contact with the heat pipe, and has no direct contact with the downhole air.
  • the heat pipe is composed of a pipe shell, a liquid absorbing core and an end cover, and is a mature heat dissipating device on the market, which utilizes the liquid filled in the pipe, absorbs heat at one end of the heat pipe, and releases heat at the other end, thereby realizing heat. transfer.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
  • Road Paving Structures (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

一种钻孔内热驱替式强化抽采方法，适用于煤矿井下瓦斯的高效抽采。该方法包括如下步骤：首先在煤层里交错布置抽采钻孔和热驱替钻孔，接着利用热管（5）在钻孔内持续加热煤体，形成较稳定的温度场，通过热效应显著降低瓦斯吸附势，促进瓦斯解吸，从而达到强化瓦斯抽采的目的。该方法可以扩大单孔有效卸压影响范围，使煤层瓦斯抽采效率提高40％以上，安全可靠，成本低廉，简单易行，省时省力。

Description

一种钻孔内热驱替式强化抽采方法 技术领域
本发明涉及一种钻孔内热驱替式强化抽采方法，尤其适用于煤矿井下高瓦斯低透气性煤层的瓦斯高效抽采。
背景技术
我国煤矿井下瓦斯治理的根本手段是以钻孔瓦斯抽采方式为主的瓦斯抽采措施。随着我国煤矿进入深部开采，煤层透气性低逐渐成为制约瓦斯高效抽采的主控因素。因此，强化增透成为改善瓦斯抽采效果，实现深部煤与瓦斯共采的关键技术。当前主要采用的强化增透技术主要有两种，一种是流体机械和流体介质相配合对煤体进行的处理的方法，例如水力割缝、水力压裂等；另一种是******等方式促使煤体致裂。两种方法均能增大煤层透气性，提高瓦斯抽采效果，但是仍然具有自身局限性。利用水力割缝、水力压裂等方法时，会有水锁效应等抑制瓦斯解析；利用******等方法时，则存在装药费事费力，而且***本身就是危险源，对于井下安全生产也存在一定的威胁。因此，寻找一种安全可靠、省时省力、简单易行和成本低廉的强化增透措施是十分必要的，这对提高矿井瓦斯抽采效率及预防煤与瓦斯突出具有重要意义。
诸多研究表明，煤体的瓦斯吸附势随着温度的提高会呈现显著降低。伴随瓦斯吸附势的降低，有益于煤体瓦斯解析。因此，倘若能够人为的对煤体附加一个温度场，势必会有效促进煤体瓦斯解析。
发明内容
技术问题：本发明的目的是克服已有技术中的不足之处，提供安全可靠、省时省力、简单易行和成本低廉的钻孔内热驱替式强化抽采方法。
技术方案：本发明的钻孔内热驱替式强化抽采方法，包括穿层钻孔或顺层钻孔，在煤层中间隔布置多个抽采钻孔的孔位；依次施工抽采钻孔、封孔、并联入瓦斯抽采管网进行瓦斯抽采；步骤如下：
a.在多个抽采钻孔中间隔布置多个热驱替钻孔，热驱替钻孔与抽采钻孔成交错排列；
b.依次施工热驱替钻孔，退出钻杆后向热驱替钻孔内送入注浆管、回浆管、热管和抽采管，将注浆管的外露端与注浆泵相连接、抽采管外露端与瓦斯抽采管网相连，并在热管的外露段上安装加热装置；
c.开启注浆泵，通过注浆管向热驱替钻孔内注浆，待回浆管回浆后，停止注浆，对热驱替钻孔进行封孔；
d.启动加热装置，使热管开始工作，不断向热驱替钻孔内释放热量，通过提高钻孔 内及钻孔周围煤体的温度，促进区域内煤体的瓦斯解析，从而实现热驱替式强化抽采；
e.重复上述步骤，继续下一区域的热驱替式强化抽采。
有益效果：本发明利用热管在钻孔内持续释放热量，通过对钻孔内煤体或周围煤体持续加热，从而形成较高温度场。利用煤体在温度升高时出现瓦斯吸附降低的规律，从而促进瓦斯解吸，达到强化瓦斯抽采的目的，显著扩大了单孔有效卸压影响范围，使煤层瓦斯抽采效率提高40％以上。该方法安全可靠，成本低廉，简单易行，省时省力，具有广泛的实用性。
附图说明
图1是本发明的钻孔内热驱替式强化抽采方法示意图；
图2是本发明的抽采钻孔和热驱替钻孔的交错布置示意图。
图中：1-注浆泵，2-注浆管，3-回浆管，4-加热装置，5-热管，6-抽采管。
具体实施方式
下面结合附图对本发明的一个实施例作进一步的描述：
本发明的钻孔内热驱替式强化抽采方法，包括穿层钻孔或顺层钻孔：
a.在煤层中间隔布置抽采钻孔的孔位，保障抽采钻孔在热驱替钻孔的影响范围内；
b.施工抽采钻孔，封孔，联入瓦斯抽采管道进行瓦斯抽采；
c.在多个抽采钻孔中间隔布置多个热驱替钻孔，热驱替钻孔与抽采钻孔成交错排列，如图2所示；
d.依次施工热驱替钻孔，退出钻杆后向热驱替钻孔内送入注浆管2、回浆管3、热管5和抽采管6，将注浆管2的外露端与注浆泵1相连接、抽采管6外露端与瓦斯抽采管网相连，并在热管5的外露段上安装加热装置4；
e.开启注浆泵1，通过注浆管2向热驱替钻孔内注浆，待回浆管3回浆后，停止注浆，对热驱替钻孔进行封孔；
f.待封孔结束后，启动加热装置4，使热管5开始工作，热管从加热装置吸取热量，在钻孔内释放热量，通过不断向热驱替钻孔内释放热量，从而提高钻孔内及钻孔周围煤体的温度，促进区域内煤体的瓦斯解析，进而实现热驱替式强化抽采；
g.重复步骤c～f，继续下一区域的热驱替式强化抽采。
所述的打穿层钻孔时，抽采钻孔与热驱替钻孔末端中心连线距离为6～8m；打顺层钻孔时，抽采钻孔和热驱替钻孔孔口端中心连线距离为3～5m。
所述的加热装置采用水循环加热方式或电热管加热方式。
所述的加热装置是一个密闭容器，经过隔爆处理，其加热元件浸没在水中，通过加 热水进而加热热管，或与周围环境隔绝，通过热辐射和热对流对热管加热，与热管无直接接触，与井下空气无直接接触。所述的热管由管壳、吸液芯和端盖组成，是当前市面上成熟的一种散热装置，其利用管内充填的液体，在热管一端吸收热量，在另一端释放热量，从而实现热量的传递。

Claims (3)

  1. 一种钻孔内热驱替式强化抽采方法，包括穿层钻孔或顺层钻孔，在煤层中间隔布置多个抽采钻孔的孔位；依次施工抽采钻孔、封孔、并联入瓦斯抽采管网进行瓦斯抽采；其特征在于步骤如下：
    a.在多个抽采钻孔中间隔布置多个热驱替钻孔，热驱替钻孔与抽采钻孔成交错排列；
    b.依次施工热驱替钻孔，退出钻杆后向热驱替钻孔内送入注浆管、回浆管、热管和抽采管，将注浆管的外露端与注浆泵相连接、抽采管外露端与瓦斯抽采管网相连，并在热管的外露段上安装加热装置；
    c.开启注浆泵，通过注浆管向热驱替钻孔内注浆，待回浆管回浆后，停止注浆，对热驱替钻孔进行封孔；
    d.启动加热装置，使热管开始工作，不断向热驱替钻孔内释放热量，通过提高钻孔内及钻孔周围煤体的温度，促进区域内煤体的瓦斯解析，从而实现热驱替式强化抽采；
    e.重复步骤a～d，继续下一区域的热驱替式强化抽采。
  2. 根据权利要求1所述的一种钻孔内热驱替式强化抽采方法，其特征在于：施工穿层钻孔时，抽采钻孔与热驱替钻孔孔底端中心连线距离为6～8m；施工顺层钻孔时，抽采钻孔和热驱替钻孔孔口端中心连线距离为3～5m。
  3. 根据权利要求1所述的一种钻孔内热驱替式强化抽采方法，其特征在于：所述的加热装置采用水循环加热方式或电热管加热方式。
PCT/CN2015/096789 2015-01-12 2015-12-09 一种钻孔内热驱替式强化抽采方法 WO2016112759A1 (zh)

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CN106401533A (zh) * 2016-11-25 2017-02-15 河南理工大学 二次利用顺层钻孔注液氮冷冻煤体快速消突装置与方法
US9869168B2 (en) 2015-01-12 2018-01-16 China University Of Mining And Technology Method for thermal-displacement-type strengthened extraction in drill hole
CN107893651A (zh) * 2017-12-04 2018-04-10 贵州大学 一种煤矿井下注热增透装置

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