CN104727802A - Underground coal seam holing through method - Google Patents

Underground coal seam holing through method Download PDF

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CN104727802A
CN104727802A CN 201510035352 CN201510035352A CN104727802A CN 104727802 A CN104727802 A CN 104727802A CN 201510035352 CN201510035352 CN 201510035352 CN 201510035352 A CN201510035352 A CN 201510035352A CN 104727802 A CN104727802 A CN 104727802A
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pressure
seam
injection
method
amount
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CN 201510035352
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Chinese (zh)
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CN104727802B (en )
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刘清宇
刘刚
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新奥气化采煤有限公司
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/295Gasification of minerals, e.g. for producing mixtures of combustible gases
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21CMINING OR QUARRYING
    • E21C43/00Methods for preparing for the gasification of coal underground

Abstract

The invention relates to an underground coal seam holing through method. The method is used for holing through a coal seam between a channel prefabricated during underground coal gasification and a combustion space area, the channel is formed through extending of a directional hole on the ground in the underground coal seam, the tail end of the channel is close to the combustion space area, an injection pipe is arranged in the directional hole, and gas is injected to the place nearby the tail end of the channel through the injection pipe. According to the method, gasifying agents directly act on a coal seam section to be holed through, the holing through time is shortened, a furnace establishing period is shortened, and the effects of establishing the furnace rapidly and reaching the production rapidly are achieved.

Description

地下煤层贯通方法 Coal through underground method

技术领域 FIELD

[0001] 本发明涉及一种地下煤炭气化技术领域,尤其是指地下煤炭贯通方法。 [0001] The present invention relates to an underground coal gasification technologies, and particularly to a method of underground coal through.

背景技术 Background technique

[0002] 地下煤炭气化技术主要是指煤、焦炭或者半焦等固体燃料在高温常压或者加压条件下与气化剂发生反应,转化为气体产物和少量残渣的过程。 [0002] UCG art mainly refers to the reaction of coal, char or coke and other solid fuels with the gasification agent at a high temperature atmospheric or pressurized conditions, and a small amount of product gas into the process residue. 所述气化剂主要是水蒸气、空气、不同浓度的富氧或者它们的混合气。 The gasification agent is mainly water vapor, air, or enriched with different concentrations of a mixed gas thereof. 煤炭气化过程生产燃料煤气,作为工业窑炉用气或者城市煤气,也可用于制造混合气,作为合成氨、合成甲醇和合成液体燃料的原料,因此煤炭气化技术是煤化工的重要技术之一。 Gasification process to produce fuel gas, as an industrial furnace or gas city gas, a mixed gas can also be used in the manufacture, as ammonia, methanol and synthetic raw material for synthesizing liquid fuels, coal gasification is therefore one of the important chemical coal .

[0003] 为了达到规模化生产,煤炭地下气化前需提前预制气化通道构建气化炉,在煤层气化过程中,所述通道的建立通常需要利用钻具,施工过程中所需要的钻井液以及通道内的煤层水会渗漏至所述燃空区,这种现象称为漏液。 [0003] In order to achieve large-scale production, before the underground gasification of coal gasification passage constructed gasifier preform for an advance in the CBM process of establishing the channel typically require the use of the drilling, construction process required Coal and liquid water can leak to the channel region of the combustion air, a phenomenon known as leakage. 大量漏液不利与气化运行。 A lot of leakage and adverse gasification operation. 在钻具施工后期,所述通道与所述燃空区间的煤层易发生塌方,导致钻具无法继续工作。 In the late drilling construction, landslide-prone coal seams with the passage of the fuel-air section, resulting in the drill can not continue to work. 因施工技术水平限制无法将机械建立的通道完全和与燃空区邻接的区域即火区连接,同时考虑到构建气化炉时煤层中的水和钻井液对气化产生的不利影响,一般情况下在通道施工时出现漏液现象时即有钻井液渗漏时即停止施工,从而导致机械建立的通道与燃空区所在的通道之间被一段煤层阻隔。 Due to construction technology limits can not be completely mechanical and the channel established with the fuel-air region adjacent to the region that is connected to the fire zone, taking into account the water and coal seam drilling fluid build gasification gasifier adverse effects, generally That has to stop construction when drilling fluid that is leaking, causing some seams to be a barrier between the channel and the channel established mechanical fuel-air area where leakage occurs when the phenomenon under construction at the time of passage. 在煤层气化过程中首先要通过高压气体将该段煤层压裂产生通道,从而使两个通道贯通后再进行气化生产。 The first fracturing coalbed methane produced by the process of high-pressure gas passage seam section, so that the two channels through the gasifier after production.

[0004] 现有对通道的贯通方式是通过孔口输入气化剂,不断提高进气压力的方法来压裂煤层,当煤层出现裂隙后,气体通过裂隙将两个通道连接起来;由于气体通过裂隙进入了火区,从而导致在火区附近形成逆向引火,通过热作用使通道完全贯通,最终使两个通道压力达到平衡。 [0004] The conventional way through passage is through an orifice to a gasification agent, to continuously improve the method of intake pressure to fracture the coal seam, the seam when the fracture occurs, cracks by the two gas channels are connected together; by the gas fissures into the fire area, resulting in the formation in the vicinity of the reverse pilot fire zone, by making the channel completely through the action of heat, the final equilibrium pressure of two channels. 上述方法虽然实现了地下煤层的贯通,但是贯通时间长,漏失率较高,主要原因有以下两点:(I)钻孔完工后,煤层水和钻井液的存在使大部分建造的通道充满水,现有通过孔口加压,通道内的水在压力作用下排干后所述气化剂才能到达要贯通的部位,通道越长,排水时间越长,导致贯通时间延长;(2)孔口加压时,在加压排水过程中,煤层中的水会向燃空区渗漏,对于排干水的煤层,由于气化剂直接在通道内传输,因此易于漏失至煤层中,从而延长了贯通时间。 Although the above-described method achieved through an underground coal seam, but through a long time, a high leakage rate, the following two main reasons: the (I) completed the drilling, the presence of water and drilling fluid seam so that most water-filled channel construction , conventional pressurized through the orifice, the water in the channel under pressure is drained to the gasification agent to reach the site through, the longer the channel, the longer the drainage time, resulting in prolonged penetration; (2) the hole when the pressure port, the pressure in the drainage process, the seam of water can leak into the fuel-air area, for draining the water seam, since the gasification agent directly transmitted within the channel, it is easy to loss seam, extending through the time.

发明内容 SUMMARY

[0005] 为此,本发明所要解决的技术问题在于克服现有技术中贯通煤层需要的时间长,且气化剂易于漏失在煤层中的问题从而提供一种不但气化剂可直接作用与待贯通的煤层而且贯通时间较短的地下煤层贯通方法。 [0005] To this end, the present invention is to overcome the technical problems that the prior art through the time required seam length, and the gasifying agent easily in coal dropout problem thereby providing a gasifying agent can act directly, not only to be through the coal seam and a short time through the underground coal seam through method.

[0006] 为解决上述技术问题,本发明所述的一种地下煤层贯通方法,用于将煤炭地下气化时预制的通道与燃空区之间的煤层贯通,所述通道由地面上的定向孔在地下煤层延伸形成,且所述通道的末端靠近所述燃空区,所述方法包括以下步骤:步骤S1:在所述定向孔内设置注入管,通过向所述注入管内注入气体对所述通道的末端附近进行缓慢加压;步骤S2:提高所述注入管的加压量,观察所述注入管处的压力变化,若压力开始下降,表明所述注入管内的气体向待贯通煤层渗漏;步骤S3:增加所述注入管的进气量用以维持所述注入管的加压量;观察所述定向孔的孔口处的压力变化值,当孔口处的压力值趋近于所述燃空区的压力值时,贯通完成。 [0006] To solve the above problems, an underground coal seam through the method of the present invention, for the seam between the prefabricated underground coal gasification fuel-air passage area through the passage by the orientation on the ground seam extending hole formed in the ground, and the end of the channel region close to the combustion air, said method comprising the following steps: step S1: the directional bore is provided in the injection pipe, through which gas is injected into the injection tube near the end of said passage for pressurized slowly; step S2: increase the amount of pipe pressure, the injection pressure change was observed at the injection tube, if the pressure begins to fall, indicating that the gas in the tube to be injected through the coal seam permeability a drain; step S3: increasing the intake air amount of the injection tube to maintain the tube pressure injection amount; the pressure change was observed at the orifice of the directional opening when pressure at the orifice tends to when the fuel-air pressure region, through completion.

[0007] 在本发明的一个实施例中,所述步骤SI和所述步骤S2之间还设有调节所述定向孔的孔口处压力为零的步骤。 [0007] In one embodiment of the present invention, the step between the step S2 and SI further provided the step of orienting the aperture of said hole pressure zero adjustment.

[0008] 在本发明的一个实施例中,所述调节定向孔的孔口处压力为零的步骤如下:密封所述定向孔的孔口,通过设置在密封位置下方的放散管缓慢降低所述孔口的压力直至孔口处的压力为零。 Step zero pressure at the orifice [0008] In one embodiment of the present invention, the adjusting hole is oriented as follows: sealing said aperture directional opening, disposed below the sealing position by diffusing slowly lowering the tube pressure orifice until the pressure at the orifice to zero.

[0009] 在本发明的一个实施例中,所述放散管内有水排出地面时,所述孔口的压力为零。 When [0009] In one embodiment of the present invention, the emission surface has a water discharge pipe, the orifice pressure is zero.

[0010] 在本发明的一个实施例中,所述步骤S2中,通过提高所述注入管的加压量来增加通入通道末端的进气量。 [0010] In one embodiment of the present invention, the step S2, the measuring tube by the pressure increase of the injection to increase the passage into the end of the intake air amount.

[0011] 在本发明的一个实施例中,所述注入管的加压量提高后,所述通道与所述燃空区之间的待贯通煤层形成间隙,从而使所述注入管内的气体向待贯通煤层渗漏,导致所述注入管的压力开始下降。 After [0011] In one embodiment of the present invention, the injection pressure increases the amount of pipe to be through the seam between the fuel channel and the air gap region is formed, so that the gas into the injection tube be leakage through the seam, resulting in a pressure of the injection pipe starts decreasing.

[0012] 在本发明的一个实施例中,所述注入管加压量的最高压力应小于煤层顶板所承受的压力。 [0012] In one embodiment of the present invention, the maximum injection pressure tube pressure should be less than the amount of pressure on the top plate seam.

[0013] 在本发明的一个实施例中,所述步骤S3中,为了维持所述注入管的加压量,所述注入管的进气量逐渐增加,当进气量升高到设定值后,保持该进气量不变,观察所述定向孔的孔口处的压力变化值。 [0013] In one embodiment of the present invention, the step S3, the amount of pressure in order to maintain the injection tube, said injection tube is gradually increased intake air amount, when the intake air amount increases to the set value after the intake air amount remains constant, the pressure observed at the orifice of the directional opening change value.

[0014] 在本发明的一个实施例中,所述注入管的末端在所述通道的末端附近。 [0014] In one embodiment of the present invention, the ends of the tube near the end of the injection channel.

[0015] 在本发明的一个实施例中,所述通道的水平段设有支护管材。 [0015] In one embodiment of the invention, the horizontal segment of the channel is provided with support pipe.

[0016] 本发明的上述技术方案相比现有技术具有以下优点: [0016] The technical solution of the present invention has the following advantages over the prior art:

[0017] 本发明所述气化剂直接作用于待贯通段煤层,从而降低了贯通时间,缩短了建炉周期,达到了快速建炉、快速达产的效果。 The [0017] present invention, the gasifying agent to be directly applied to the seam through the section, thereby reducing the penetration time, shortened construction period of the furnace, a furnace construction to achieve a rapid, rapid production of effect.

附图说明 BRIEF DESCRIPTION

[0018] 为了使本发明的内容更容易被清楚的理解,下面根据本发明的具体实施例并结合附图,对本发明作进一步详细的说明,其中 [0018] In order to make the present invention understood more readily apparent, according to the following particular embodiments of the invention taken in conjunction with the accompanying drawings, the present invention will be further described in detail, wherein

[0019] 图1是本发明所述地下煤层的结构示意图; [0019] FIG. 1 is a schematic view of an underground seam of the present invention;

[0020] 图2是本发明在地面上采用的相关设备示意图。 [0020] FIG. 2 is a schematic view of apparatus according to the present invention is related employed on the ground.

具体实施方式 detailed description

[0021] 如图1和图2所示,本发明提供了一种地下煤层贯通方法,用于将煤炭地下气化时预制的通道11与燃空区12之间的煤层贯通,所述通道11由地面上的定向孔IlA在地下煤层10延伸形成,所述通道11的水平段位于所述煤层底板1A附近,且所述通道11的末端IlB靠近所述燃空区12,所述方法包括以下步骤:步骤S1:在所述定向孔IlA内设置注入管13,通过向所述注入管13内注入气体对所述通道11的末端IlB附近进行缓慢加压;步骤S2:提高所述注入管13的加压量,观察所述注入管13处的压力变化,若压力开始下降,表明所述注入管13内的气体向待贯通煤层渗漏;步骤S3:增加所述注入管13的进气量用以维持所述注入管13的加压量;观察所述定向孔IlA的孔口处的压力变化值,当孔口处的压力值趋近于所述燃空区12的压力值时,贯通完成。 [0021] FIGS. 1 and 2, the present invention provides a method of penetrating an underground seam, for prefabricated underground coal gasification fuel passage 11 and the space between the seam region 12 through the channel 11 oriented bore 10 extends from the ground IlA seam is formed in the ground, the horizontal section of the channel 11 located in the vicinity of the seam floor. 1A, end 11 of the channel IlB and close to the fuel-air region 12, the method comprising step: step S1: set in the directional opening IlA injection pipe 13, near the end of the gas passage 11 is pressurized by injecting slowly IlB inner tube 13 to the implantation; step S2: to improve the injection pipe 13 the amount of pressure, the pressure change was observed at the injection tube 13, if the pressure begins to fall, indicating that the injection pipe 13 to the gas leakage through the seam to be; step S3: increase the gas injection pipe 13 of the 13 is pressurized to maintain the amount of said injection pipe; pressure change was observed in the IlA directional opening at the orifice, when the pressure at the orifice region close to the combustion air pressure 12, through carry out.

[0022] 本发明所述的地下煤层贯通方法,用于将煤炭地下气化时预制的通道11与燃空区12之间的煤层贯通,所述燃空区12的下方是灰渣16,所述通道11由地面上的定向孔IlA在地下煤层延伸形成,所述通道11的水平段位于所述煤层底板1A附近,且所述通道11的末端IIB靠近所述燃空区12,所述步骤SI中,在所述定向孔11A内设置注入管13,通过所述注入管13向所述通道11的末端IlB附近缓慢加压,从而使通道11内产生一定的压力值,由于通过注入管13从地面向煤层注入气体时,可以将气体直接输送至待贯通的煤层,避免了气体在传输过程中渗漏的可能性,因此提高了气体的使用率,而且降低了贯通时间;所述步骤S2中,提高所述注入管13的加压量,随着所述注入管13内加压量的不断提高,所述注入管13内的气体会逐渐向待贯通煤层渗漏,导致所述注入管13处的压力出现下 [0022] The method of penetrating underground seam of the present invention, when used in the prefabricated underground coal gasification fuel passage 11 and the space region 12 between the seam through the fuel-air zone 12 is below the ash 16, the said passage is formed by a directional hole 11 extends IlA underground seam on the ground, the horizontal section of the channel 11 located in the vicinity of the seam floor. 1A, end 11 of the channel IIB and close to the fuel-air region 12, said step the SI, disposed within the bore 11A directional injection pipe 13, through the injection pipe 13 to the pressure slowly near the end of the channel 11 ILB, so that a certain pressure passage 11, since the injection tube 13 when the gas is injected from the coal seam face, the gas can be delivered directly through the seam to avoid the possibility of gas leakage during transmission, thus improving the utilization of the gas, but also reduces the penetration time; step S2 , increasing the amount of pressure of the injection tube 13, as the injection pipe 13 continues to increase the amount of pressurization, the gas in the injection pipe 13 to be gradually leak through the seam, resulting in the injection pipe 13 appear under pressure 趋势,通过所述步骤S2可以推测得到所述注入管13内的加压量从而有效节约能源;所述步骤S3中,为了加快通道11与燃空区12之间的煤层贯通,由于步骤S2中压力出现了下降趋势,因此需要增加所述注入管13的进气量用以维持所述注入管13的加压量,使注入管13内的气体源源不断的向待贯通煤层渗漏,当所述定向孔IlA的孔口处的压力值趋近于所述燃空区12的压力值时,说明所述通道11与所述燃空区12之间的待贯通煤层已被完全打通,贯通完成。 Trends, presumably obtained by the step S2 of the injection pipe 13 so that the amount of pressurized effectively save energy; in the step S3, in order to speed up the passage 11 and the combustion space 12 through the region between the seam, since the step S2 pressure a downward trend, it is necessary to increase the intake air amount of the injection pipe 13 to an amount of pressure to maintain the injection tube 13, so that the gas injection pipe 13 in a steady stream to be leakage through the seam, when the said pressure port at the directional opening IlA value close to the pressure region 12 of the fuel-air value, indicating the passage 11 between the combustion space 12 through the seam area has been completely be opened, through the complete .

[0023] 本发明所述步骤SI中,通过地面上所述注入管13上设置的压力表Pl观察进气压力变化,且通过所述定向孔IlA的孔口设置的压力表P2观察孔口压力变化。 [0023] Step SI the present invention, by the injection into the ground to observe the pressure gauge provided on the gas pipe 13 Pl pressure changes, the pressure gauge P2 was observed through the aperture and an aperture disposed directional opening pressure IlA Variety. 通过所述注入管13向所述通道11的末端IlB附近缓慢加压时,所述加压过程按0.5MPa/2h频次进行,且控制进气最高压力在2.5MPa至3MPa之间。 When pressure is applied gradually to near the end of the passage 11 IlB through the injection tube 13, the pressing process by 0.5MPa / 2h for frequency, and controls to 2.5MPa between 3MPa at the highest inlet pressure.

[0024] 由于煤层在气化过程中,所述通道11 一般较长且所述通道11内还存在一定量的水,因此所述注入管13的压力值和所述通道11的末端IlB的压力值不同,为了测量所述末端IlB处压力值,通过所述定向孔IlA的孔口处压力值可以大致反应所述末端IlB的压力,为了克服所述通道11内本身存在的空气以及一定量的水对所述通道11的末端IlB压力的影响,因此所述步骤SI和所述步骤S2之间还设有调节所述定向孔IlA的孔口处压力为零的步骤。 [0024] Since the seam in the gasification process, the channels 11 is generally longer and there is a certain amount of water in the passage 11, and therefore the pressure values ​​of the injection pipe 13 and the passage 11 of the tip IlB different values, in order to measure the pressure value at the end IlB, by the pressure at the orifice may be substantially oriented bore IlA end pressure IlB of the reaction, in order to overcome the inherent passage 11 and an amount of air water on the end IlB pressure passage 11, it is also provided the step of regulating the pressure at the orifice of the directional opening IlA zero between said step and said step SI S2. 具体地,所述调节定向孔IlA的孔口处压力为零的步骤如下:密封所述定向孔IlA的孔口,从而避免所述通道11内的压力受外界环境的干扰,通过设置在密封位置IIC下方的放散管14缓慢降低所述孔口的压力直至孔口处的压力为零。 Step zero pressure at the orifice in particular, the adjustment of the directional opening IlA follows: sealing the aperture hole IlA orientation so as to avoid the pressure in the passage 11 by the interference of the external environment, provided in the sealed position by IIC 14 below the vent pipe to the orifice pressure slowly reduced until the pressure at the orifice to zero.

[0025] 上述调节所述定向孔孔口处的压力方法中,通过所述放散管14缓慢降压且反复多次,保持降压速率在0.1MPa/h,使所述注入管13进气的方式保证进气压力在2.5MPa至3MPa之间,从而实现使孔口压力降至零的目的。 [0025] The method of adjusting the orientation of the pressure at the orifice hole by the vent pipe 14 and slow down repeatedly, holding down the rate at 0.1MPa / h, the injection pipe 13 of the intake means to ensure the intake pressure between 2.5MPa to 3MPa, in order to achieve the purpose of making the pressure was reduced to zero orifice. 所述放散管14内有水排出地面时,表明所述通道11内的水面上部至所述定向孔IlA孔口的空气被抽出,此时关闭阀门17,所述孔口的压力降为零,继续施工时,若通道11的末端IlB再次发生压力的变化就可以直接排除了外界环境的影响,从而避免了外界环境对通道末端的影响。 When the vent pipe to discharge water surface 14, show that the upper water level in the passage 11 is oriented to the air vent aperture IlA is drawn, this time to close the valve 17, the orifice pressure drop to zero, when construction continues, if the change in pressure channel end IlB 11 recurrence can be directly exclude the impact of the external environment, so as to avoid the influence of the external environment on the end of the tunnel.

[0026] 本发明所述步骤S2中,由于通过所述步骤SI中注入管13的加压使所述通道11的末端IlB已经具有了一定的压力,导致此时所述待贯通煤层处于自身排水阶段或煤层内的排水阶段,该阶段表现为压力高、流量小,为了调高所述注入管13的加压量,可以通过增加所述注入管13的加压量实现。 [0026] In step S2 of the present invention, since the step SI by pressing the injection pipe 13 so that the end of the channel IlB 11 already has a certain pressure, resulting in this case the seam is to be self draining through drainage stage or stages in the coal seam, the stage showed high pressure, low flow, in order to increase the pressure of the injection amount of the tube 13 can be pressurized by increasing the amount of injection pipe 13 is achieved. 为了使进气量达到500Nm3/h,以0.5Nm3/4h的频次提高进气压力,当通过提高加压量将进气达到500Nm3/h,维持该压力运行。 In order to reach the intake air amount 500Nm3 / h, to the frequency 0.5Nm3 / 4h increase the intake pressure, the intake air amount when the pressure reaches 500Nm3 / h by increasing, maintaining the operating pressure. 若所述注入管13的加压量逐渐提高后,使所述通道11与所述燃空区12之间的待贯通煤层逐渐产生间隙,这种间隙可以是裂缝或者缝隙,最终使所述注入管13内的气体通过所述间隙向待贯通煤层渗漏,导致所述注入管13的压力开始逐步下降。 If the amount of the injection pressure pipe 13 is gradually increased with the passage 11 through the seam 12 to be between the fuel-air zone is gradually gap, which gap can be crack or gap, the final injection the gas pipe 13 through the gap to be leakage through the seam, resulting in the injection pressure tube 13 gradually decrease.

[0027] 需要指出的是:所述注入管13加压量的最高压力应小于煤层顶板1B所承受的压力,以防止煤层顶板1B承受的压力过大可能导致煤层顶板1B坍塌的问题。 [0027] It is noted that: the amount of pressurization of the injection pipe 13 should be less than the maximum pressure in seam roof pressure on 1B, 1B roof seam to prevent the pressure is too large may cause problems 1B seam roof collapse. 若所述注入管13的加压量达到最高时,进气量未到达500Nm3/h,维持该压力运行。 If the amount of the injection pipe 13 is the highest pressure, the intake air amount does not reach 500Nm3 / h, the pressure was maintained operation. 当进气量达到500Nm3/h后,一段时间后,所述注入管13处压力开始下降,说明少量气体已进入燃空区。 When the intake air amount reaches 500Nm3 / h, a period of time, the injection pipe 13 at the pressure begins to fall, indicating that a small amount of gas has entered the combustion zone empty.

[0028] 为了进一步扩大所述待贯通煤层的间隙,使所述注入管13内的气体可以持续作用在所述待贯通煤层上,本发明所述步骤S3中,需要维持所述注入管13的加压量,而为了维持所述注入管13的加压量,所述注入管13的进气量需要逐渐增加,当进气量升高到设定值后,不在提高进气量,维持该进气量的运行,即通过提高进气量的方法维持该压力继续运行,当进气量达到800Nm3/h,不在提高进气量,保持该进气量不变,观察所述定向孔IlA的孔口处的压力变化值,当孔口处的压力呈现下降趋势,且孔口处的压力趋近于所述燃空区12的压力时,说明所述通道11与所述燃空区12之间的待贯通煤层已被完全打通,贯通完成。 [0028] In order to further expand the gap of the seam to be through, the gas in the injection pipe 13 can be sustained through acting on the seam, the present invention is step S3, it is necessary to maintain the injection tube 13 the amount of pressure, in order to maintain the pressure and the amount of the injection tube 13, the tube 13 is injected into air amount needs to increase gradually, when the intake air amount is increased to the set value, the intake air amount does not improve, maintain the intake air operation, i.e., continue to run the pressure was maintained by raising the intake air amount, when the intake air amount reaches 800Nm3 / h, the intake air amount does not increase, the intake air amount remains unchanged, to observe the orientation of aperture IlA the pressure change at the orifice, the pressure at the orifice when a downward trend, and the pressure at the orifice to the combustion air approaching pressure region 12, illustrating the passage 11 with the region 12 of the fuel-air between seams be through has been completely opened up, through completion.

[0029] 下面结合具体数据来说明如何实现地下煤层的贯通: [0029] Next, with reference to specific data to illustrate how to achieve through the underground seam:

[0030] 实施例一: [0030] Example a:

[0031] 在所述定向孔IlA内设置所述注入管13,将所述注入管13下放至距离所述通道11的末端IlB的Im位置,通过所述注入管13向所述通道11的末端IlB附近缓慢加压,缓慢提高进气压力值至2.0MPa,观察孔口压力变化;当所述定向孔IlA的孔口出现压力后,通过所述放散管14将孔口放散缓慢泄压至孔口处出水,然后关闭设置在所述放散管14处的阀门17 ;提高所述注入管13的加压量,当进气量达到300Nm3/h后,停止加压,观察所述注入管13处的压力变化,若压力低于3.0MPa时,表明所述注入管13内的气体开始向待贯通煤层渗漏。 [0031] The injection pipe 13 is provided, the injection pipe 13 lowered into position from the end of the channel Im IlB 11 within the directional bore IlA, through the injection tube ends 13 to the passage 11 near IlB slow pressure slowly increased to 2.0MPa intake pressure values, the pressure change was observed orifice; orientation when said orifice aperture IlA pressure occurs, through the vent pipe 14 to the relief orifice holes diffuse slowly mouth water, and then close the valve disposed in the vent pipe at 1417; the amount of pressure increase of the injection tube 13, when the intake air amount reaches 300Nm3 / h, the pressure is stopped, the injection pipe was observed at 13 pressure change, if the pressure is lower than 3.0MPa, indicating that the gas in the injection pipe 13 starts to be leakage through the seam. 增加所述注入管13的进气量用以维持所述注入管13的加压量,使进气压力保持在3.0MPa左右,通过多次提高进气量,当进气量达到600Nm3/h时,停止增加进气量,保持该进气量进行贯通,同时观察所述定向孔IlA的孔口处的压力变化值,当测得所述注入管13的进气压力值和所述定向孔IlA的孔口处的压力值均降至0.7MPa时,说明贯通完成。 The intake air amount increases injection tube 13 is pressurized to maintain the amount of the injection tube 13, the intake pressure is maintained at about 3.0MPa, repeatedly raised by the intake air amount, when the intake air amount reaches 600Nm3 / h stopping the increase of the intake air amount, the intake air amount be maintained through, while observing the directional opening pressure change at IlA aperture, when the intake pressure measured values ​​of the injection pipe 13 and the directional opening IlA the pressure value at the orifice decreased to 0.7MPa, through the complete description.

[0032] 实施例二: [0032] Example II:

[0033] 在所述定向孔IlA内设置所述注入管13,将所述注入管13下放至距离所述通道11的末端IlB的0.5m位置,通过所述注入管13向所述通道11的末端IlB附近缓慢加压,同时控制所述放散管14处的阀门17,使所述注入管13的进气压力保持在2.5MPa至3.0MPa范围内,从而将通道11内的水通过所述放散管14上的排出。 [0033] disposed within the bore IlA orientation of the injection tube 13, the tube 13 is lowered into the injection position IlB distance 0.5m end of the passage 11, through the injection pipe 13 to the duct 11 IlB slowly near the end of pressing, while the control valve 17 of vent pipe 14, the intake pressure of the injection pipe 13 is maintained in the range of 2.5MPa to 3.0MPa, so that the water in the passage 11 through the relief 14 on the discharge pipe. 当所述放散管14内不再有水排出后,停止孔口进气,提高所述注入管13的加压量,观察所述注入管13处的压力变化,若压力开始下降,表明所述注入管13内的气体向待贯通煤层渗漏,此时进气量达到300Nm3/h,则保持该所述注入管13处的压力,提高所述注入管13的进气量;增加所述注入管13的进气量用以维持所述注入管13的加压量,若所述进气量低于300Nm3/h时,提高所述注入管处的压力从而将流量提高至300Nm3/h,在保持进气压力不变的情况下,提高进气量至650Nm3/h,观察所述定向孔IlA的孔口处的压力变化值,当孔口压力降至0.7MPa以下,说明贯通完成。 The vent pipe 14 when no more water is discharged, the inlet aperture stop, the amount of pressure increase of the injection tube 13, the pressure change was observed at the injection tube 13, if the pressure begins to fall, indicating that the the gas injection pipe 13 to be leakage through the seam, when the intake air amount reaches 300Nm3 / h, which is maintained at a pressure of the injection tube 13, the intake air amount increase of the injection pipe 13; increase the injection when the intake air pipe 13 to the amount of pressure to maintain the injection tube 13, when the intake air amount is less than 300Nm3 / h, increasing the pressure at said injection pipe so as to increase the flow rate of 300Nm3 / h, in maintaining a constant intake pressure, to increase the intake air amount 650Nm3 / h, the pressure change was observed IlA directional opening at the aperture, the aperture when the pressure was reduced to 0.7MPa described below through completion.

[0034] 无论实施例一或实施例二,本发明所述通道的末端IlB至所述燃空区12间所贯通的煤层段距离最短,从而利于煤层的贯通,使贯通时间最短。 [0034] Whether or an embodiment according to the second embodiment of the present invention to the end of the fuel passage IlB seam segment distance through the shortest space region 12, thereby facilitating penetration of the seam, the through shortest. 所述注入管通过地面机械驱动进行前后移动,且所述注入管13可以选择已经技术成熟的连续油管。 The injection machine moved back and forth driving of the ground by the pipe and the injection pipe 13 may be selected mature technology already coiled tubing.

[0035] 为了保证贯通的顺利进行,避免煤层失水后导致煤层10可能垮落在通道11内从而堵塞所述注入管13的问题,所述注入管13的末端设置在所述通道11的末端IlB附近。 [0035] In order to ensure smooth penetration of the seam to avoid dehydration seam 10 may cause collapse fall passage 13 so that the problem of clogging of the injection tube 11, the end of the injection tube 13 is provided at an end of the channel 11 near IlB. 具体地,所述注入管13的终端位置与所述通道11的末端IlB的距离大约在0.5m至1.0m之间。 Specifically, the injection tube 13 and the position of the terminal end of the passage 11 IlB distance between about 0.5m to 1.0m.

[0036] 为了克服煤层气化过程中的由钻井液以及通道内的煤层水渗漏至所述燃空区的漏液情况,可将所述注入管13下放在通道前,先将所述注入管13前端密封,如此以来,不但能防止煤层10失水后导致煤层10垮落堵塞注入管13的问题,同时防止通道11内沉淀的煤渣堵塞所述注入管13。 Before [0036] To overcome the CBM process of drilling fluid leakage from the water channel and the seam where the fuel to air leakage area of ​​the injection pipe 13 may be placed under the channel, the first injection the pipe end seal 13, so since not only prevent water loss after 10 10 Coal seam cause collapse clogging problems injection tube 13, while preventing the passage 11 precipitated cinder block the injection pipe 13. 所述注入管13前端密封后,使用前可通过向所述注入管13内输入一定的压力从而破除密封。 After sealing the front end of the injection tube 13, prior to use by a certain input to the injection pressure tube 13 so as to break the seal.

[0037] 所述通道11的水平段设有支护管材15,所述支付管材15可以选择玻璃钢支护,所述支护管材15主要起到对所述通道11的水平段起到支护作用,从而防止煤层10塌落堵塞通道;同时考虑到后期所述通道贯通和逆向气化等步骤,所述支护管材15应具有一定抗压性,且在高温条件下具有可燃的特性,一般选择具有一定抗压等级的玻璃钢管。 Horizontal paragraph [0037] of the channel 11 is provided with a support tube 15, the tube 15 may be selected payment fiberglass support, the support pipe 15 functions primarily as supporting the passage of the horizontal section 11 effects thereby preventing collapse seam 10 plugged channels; taking into account the post and passage through a reverse gasification step, the support tube 15 should have some resistance to stress, and has a flammable properties at high temperatures, typically selected FRP pipe has a certain level of compression. 在实际施工中,若气化煤田煤质较硬时,所述通道11水平段可不下放支护管材15。 In the actual construction, if the hard coal gasifying coal, the channel 11 may not be delegated horizontal section of pipe support 15.

[0038] 本发明中,所述通道11可提前根据计划施工,当测得火区到达所述通道11的要贯通位置时开始按本发明方法加压贯通;所述通道11也可先施工垂直段和斜孔部分段,当火区燃烧至其附近时再施工其水平段部分,也可在气化一段时间后根据实际情况施工。 [0038] In the present invention, the channel 11 may be advanced in accordance with the construction plan, when the measured reaches the fire area by the method of the present invention begins passage through the pressing position is to be through 11; and the channel 11 may be perpendicular to the first construction and section paragraph slant holes, when the fire area to burn near horizontal segment portion further construction, the construction may be based on the actual situation in the gasification time.

[0039] 本发明所述气体是指煤层气化过程中常用的气化剂,所述气化剂可以选择空气也可以选择氧气和其他惰性气体进行配比,氧浓度在21% -50%之间。 [0039] The present invention refers to a gas used in the process of CBM gasifying agent, the agent may be selected gasification air and oxygen can also choose other inert gas ratio, the oxygen concentration of 21% -50% between. 在本实施例二中,所述气化剂选择35% 二氧化碳富氧。 Second embodiment In the present embodiment, the gasification agent is selected 35 percent carbon dioxide enriched.

[0040] 综上,本发明所述的地下煤层贯通方法具有以下优点: [0040] In summary, the method of the present invention through the underground seam has the following advantages:

[0041] 1.在本发明的所述步骤SI中,通过所述注入管向所述通道的末端附近缓慢加压,从而使通道内产生一定的压力值,由于通过注入管从地面向煤层注入气体时,可以将气体直接输送至待贯通的煤层,避免了气体在传输过程中渗漏的可能性,因此提高了气体的使用率,而且降低了贯通时间;所述步骤S2中,提高所述注入管的加压量,所述注入管内的气体会逐渐向待贯通煤层渗漏,导致所述注入管处的压力出现下降趋势,通过所述步骤S2可以推测得到所述注入管内的加压量从而有效节约能源;所述步骤S3中,为了加快通道与燃空区之间的煤层贯通,需要增加所述注入管的进气量用以维持所述注入管的加压量,使注入管内的气体源源不断的向待贯通煤层渗漏,当所述定向孔的孔口处的压力值趋近于所述燃空区的压力值时,说明所述通道与所述燃空区之间 [0041] 1. In step SI the present invention, through the injection tube to near the end of the channel gradually pressurized, so that a certain pressure value within the channel, since the injection tube from the coal seam through the injection face the gas, the gas can be delivered directly through the seam to avoid the possibility of gas leakage during transmission, thus improving the utilization of the gas, but also reduces the penetration time; in the step S2, the increase injection pressure measuring tube, the gas is injected in the pipe will be gradually leaks through the seam, resulting in a pressure tube at the injection declining trend obtained by the pressing step can be estimated amount in said injection tube S2 thereby effectively saving energy; in the step S3, in order to accelerate the seam between the through passage and the fuel-air zone, the need to increase the gas injection pipe for maintaining the pressure of the injection amount of the tube, the inner injection tube steady stream of gas to be leakage through the seam, when the directional opening pressure value close to the pressure at the orifice of the fuel-air zone value, indicating the passage between the fuel-air zone 待贯通煤层已被完全打通,贯通完成。 To be through the coal seam has been completely opened up, through completion.

[0042] 2.在本发明的煤层气化过程中,由于所述注入管的压力值和所述通道的末端的压力值不同,为了测量所述末端处压力值,通过所述定向孔的孔口处压力值可以大致反应所述末端的压力,因此所述步骤SI和所述步骤S2之间还设有调节所述定向孔的孔口处压力为零的步骤。 [0042] 2. In the process of the present invention, the CBM, the end of the pressure value of the pressure tube and the injection channel are different, in order to measure the pressure value at the end, by the directional bore holes pressure may be generally at the mouth end of the reaction pressure, it is also provided the step of regulating the pressure at the orifice of the directional opening between zero and said step SI the step S2.

[0043] 3.本发明所述注入管的末端设置在所述通道的末端附近,从而避免煤层失水后导致煤层可能垮落在通道内从而堵塞所述注入管的问题。 End [0043] 3. The present invention of the injection pipe is provided near the end of the channel, so as to avoid the seam seam may cause dehydration problems fall collapse thus blocking the passage inside the injection tube.

[0044] 4.在本发明的一个实施例中,向注入管通气时,当所述定向孔的孔口出现压力后,通过所述放散管将孔口放散缓慢泄压至孔口处出水,使所述孔口的压力降为零,气化剂可直接作用于要贯通的部位,有利于减少贯通时间,提高贯通效率。 [0044] 4. In one embodiment of the present invention, the ventilation tube is injected, when the directional opening orifice pressure occurs, through the vent pipe will slowly release the pressure relief orifice to the outlet orifice, the orifice pressure drop to zero, gasifying agent may act directly on the site through to help reduce the penetration time, improve penetration efficiency.

[0045] 显然,上述实施例仅仅是为清楚地说明所作的举例,并非对实施方式的限定。 [0045] Clearly, the above-described embodiments are merely made to clearly illustrate example, the embodiment is not limited to the embodiment. 对于所属领域的普通技术人员来说,在上述说明的基础上还可以做出其它不同形式的变化或变动。 Those of ordinary skill in the art, on the basis of the above described variations or changes may be made in various other forms. 这里无需也无法对所有的实施方式予以穷举。 It is unnecessary and can not be exhaustive of all embodiments. 而由此所引伸出的显而易见的变化或变动仍处于本发明创造的保护范围中。 And obvious variations or variations therefrom corollary still in the scope of the present inventions.

Claims (10)

  1. 1.一种地下煤层贯通方法,用于将煤炭地下气化时预制的通道(11)与燃空区(12)之间的煤层贯通,所述通道(11)由地面上的定向孔(IlA)在地下煤层(10)延伸形成,且所述通道(11)的末端(IlB)靠近所述燃空区(12),其特征在于,所述方法包括如下步骤: 步骤S1:在所述定向孔(IlA)内设置注入管(13),通过向所述注入管(13)内注入气体对所述通道的末端(IlB)附近进行缓慢加压; 步骤S2:提高所述注入管(13)的加压量,观察所述注入管(13)处的压力变化,若压力开始下降,表明所述注入管(13)内的气体向待贯通煤层渗漏; 步骤S3:增加所述注入管(13)的进气量用以维持所述注入管(13)的加压量;观察所述定向孔(IlA)的孔口处的压力变化值,当孔口处的压力值趋近于所述燃空区(12)的压力值时,贯通完成。 CLAIMS 1. A method for penetrating underground seam, the seam between the preform for the underground gasification of coal passage (11) and the fuel-air zone (12) through said passage (11) on the ground by the orientation of aperture (IlA ) (10) is formed to extend in the underground seam, and the end of the channel (11) (ILB) near the fuel-air zone (12), characterized in that the method comprises the following steps: step S1: orienting the a hole (IlA) of injection pipe (13), by injection to the injection pipe (13) within the vicinity (ILB) end of the gas passage is gradually pressurized; step S2: to improve the injection pipe (13) the amount of pressurization, the observed change in pressure at the injection pipe (13), if the pressure begins to fall, indicating that the injection pipe (13) to be within the gas leakage through the seam; step S3: increasing the injection pipe ( 13) maintaining the amount of intake air to the amount of pressurized injection pipe (13); a pressure variation value observed at the orifice of the directional bore (IlA), and when the pressure value is close to the orifice pressure fuel-air zone (12) value, through completion.
  2. 2.根据权利要求1所述的地下煤层贯通方法,其特征在于:所述步骤SI和所述步骤S2之间还设有调节所述定向孔(IlA)的孔口处压力为零的步骤。 The method according to the through subterranean coal seam to claim 1, wherein: said adjusting step further has a directional opening (IlA) orifice at a pressure between zero and said step SI to the step S2.
  3. 3.根据权利要求2所述的地下煤层贯通方法,其特征在于:所述调节定向孔(IlA)的孔口处压力为零的步骤如下:密封所述定向孔(IlA)的孔口,通过设置在密封位置(IlC)下方的放散管(14)缓慢降低所述孔口的压力直至孔口处的压力为零。 3. The method of penetrating underground seam according to claim 2, wherein: the step of orienting hole (IlA) orifice at zero pressure adjustment of the following: directional opening to seal the orifice (IlA) by vent pipe (14) is disposed below the sealing position (IlC) slowly lowering the pressure until the pressure orifice aperture at zero.
  4. 4.根据权利要求3所述的地下煤层贯通方法,其特征在于:所述放散管(14)内有水排出地面时,所述孔口的压力为零。 4. The method of claim 3 through underground seam according to claim wherein: said vent pipe (14) when the water surface is discharged, the orifice pressure is zero.
  5. 5.根据权利要求1所述的地下煤层贯通方法,其特征在于:所述步骤S2中,通过提高所述注入管(13)的加压量来增加通入通道末端(IlB)的进气量。 The method according to the through subterranean coal seam to claim 1, wherein: said step S2, to increase the tip into the channel (ILB) increasing the amount of intake air pressurized by the injection pipe (13) .
  6. 6.根据权利要求5所述的地下煤层贯通方法,其特征在于:所述注入管(13)的加压量提高后,所述通道(11)与所述燃空区(12)之间的待贯通煤层形成间隙,从而使所述注入管(13)内的气体向待贯通煤层渗漏,导致所述注入管(13)的压力开始下降。 The underground coal seam through the method of claim 5, wherein: the amount of pressurization after injection pipe (13) is increased, the channel (11) and the fuel-air zone (12) between the seam through a gap to be formed, so that the gas (13) through the injection pipe to be seam leaks, resulting in the injection pipe (13) pressure begins to drop.
  7. 7.根据权利要求6所述的地下煤层贯通方法,其特征在于:所述注入管(13)加压量的最高压力应小于煤层顶板(1B)所承受的压力。 7. The method of penetrating underground seam according to claim 6, wherein: said injection pipe (13) pressurizing the pressure should be less than the maximum amount of coal seam roof (1B) is subjected to pressure.
  8. 8.根据权利要求1所述的地下煤层贯通方法,其特征在于:所述步骤S3中,为了维持所述注入管(13)的加压量,所述注入管(13)的进气量逐渐增加,当进气量升高到设定值后,保持该进气量不变,观察所述定向孔(IlA)的孔口处的压力变化值。 8. The method of claim 1 through underground seam claim, wherein: said step S3, in order to maintain (13) pressurizing the injection amount control, intake air pipe (13) of the injection is gradually increases, and when the intake air amount is increased to the set value, the intake air amount remains constant, the pressure change was observed at the orifice of the directional bore (IlA) a.
  9. 9.根据权利要求1或5-8中任意一项所述的地下煤层贯通方法,其特征在于:所述注入管(13)的末端在所述通道(11)的末端(IlB)附近。 1 through 9. The method of any one of claims 5-8 or underground seam claim, wherein: said near its (ILB) end of the tube (13) at an end of said passage (11).
  10. 10.根据权利要求1所述的地下煤层贯通方法,其特征在于:所述通道(11)的水平段设有支护管材(15)。 10. The method of penetrating underground seam according to claim 1, wherein: said channel (11) is provided with a horizontal section of pipe support (15).
CN 201510035352 2015-01-23 2015-01-23 Coal through underground method CN104727802B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4573531A (en) * 1980-02-21 1986-03-04 Vsesojuznoe Nauchno-Proizvod-Stvennoe Obiedinenie "Sojuzpromgaz" Method of underground gasification of coal seam
CN102477856A (en) * 2010-11-30 2012-05-30 乌兰察布新奥气化采煤技术有限公司 Method for determining coal bed fractures
CN102477857A (en) * 2010-11-30 2012-05-30 新奥气化采煤有限公司 Passage formation method for underground coal gasification
CN202612845U (en) * 2012-05-14 2012-12-19 株洲新奥燃气有限公司 Bleeder connecting component
CN103437748A (en) * 2013-09-04 2013-12-11 新奥气化采煤有限公司 Underground coal gasifying furnace and underground coal gasifying method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4573531A (en) * 1980-02-21 1986-03-04 Vsesojuznoe Nauchno-Proizvod-Stvennoe Obiedinenie "Sojuzpromgaz" Method of underground gasification of coal seam
CN102477856A (en) * 2010-11-30 2012-05-30 乌兰察布新奥气化采煤技术有限公司 Method for determining coal bed fractures
CN102477857A (en) * 2010-11-30 2012-05-30 新奥气化采煤有限公司 Passage formation method for underground coal gasification
CN202612845U (en) * 2012-05-14 2012-12-19 株洲新奥燃气有限公司 Bleeder connecting component
CN103437748A (en) * 2013-09-04 2013-12-11 新奥气化采煤有限公司 Underground coal gasifying furnace and underground coal gasifying method

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