WO2018082201A1 - 立井井筒揭穿特厚松软突出煤层的快速卸压排放瓦斯方法 - Google Patents

立井井筒揭穿特厚松软突出煤层的快速卸压排放瓦斯方法 Download PDF

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WO2018082201A1
WO2018082201A1 PCT/CN2017/000659 CN2017000659W WO2018082201A1 WO 2018082201 A1 WO2018082201 A1 WO 2018082201A1 CN 2017000659 W CN2017000659 W CN 2017000659W WO 2018082201 A1 WO2018082201 A1 WO 2018082201A1
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coal
hole
injection units
gas
pressure
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English (en)
French (fr)
Inventor
李晓伟
唐俊
陈裕佳
蒋承林
王超杰
潘兴峰
孔卓一
陈子贤
周震
廖晓雪
高广强
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China University of Mining and Technology CUMT
China University of Mining and Technology Beijing CUMTB
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China University of Mining and Technology CUMT
China University of Mining and Technology Beijing CUMTB
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    • 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
    • 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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets

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  • the invention relates to a method for rapidly releasing pressure and discharge gas of a downhole shaft well which is exposed to a thick and soft protruding coal seam, and is suitable for the gas emission reduction gas of a thick and soft protruding coal seam with a narrow working face of the vertical shaft.
  • Article 49 (4) of the Regulations on Prevention of Coal and Gas Outburst stipulates that: the anti-burst measures for the coal seam gas area in the coal-extracting area of the pre-drilling stone door (including vertical and inclined wells) shall be exposed.
  • the coal working face is implemented before the minimum normal distance of 7 m from the coal seam (the distance should be appropriately increased in the structural failure zone).
  • the minimum control range of the drilling hole is: 12m outside the contour of the roadway in the Shimen and vertical shafts and the inclined shaft, and the outer edge of the control area to the roadway contour (including the expected front).
  • the minimum distance of the contour of the roadway of the uncovering coal section is not less than 5m, and when the drilling cannot penetrate the full thickness of the coal seam once, the minimum lead distance of the coal hole should be kept 15m.
  • the borehole needs to be controlled to the vertical wellbore contour line to the position of 12m at the coal spot. Because of the large thickness of the coal seam in the extra-thick coal seam, according to the regulations, after designing the borehole through the coal body, the range of gas to be discharged is very large. At the same time, for soft coal seams, the gas permeability is poor, and the downhole drilling is easily affected by the water seal, which makes gas discharge difficult and the single hole control range is small. Based on the above factors, the traditional gas emission method is adopted, and the number of drill holes is huge, and the working face of the narrow wellbore cannot be constructed.
  • the object of the present invention is to overcome the above problems in the prior art and to provide a method for rapid pressure relief discharge of a reliable vertical wellbore that exposes extra-thick soft protruding coal seams.
  • the present invention adopts the following technical solution: a method for quickly releasing pressure discharge gas of a vertical wellbore to expose a thick and soft protruding coal seam, comprising the following steps:
  • the wellbore is drilled to a position 7m away from the coal seam, and a multi-circle discharge borehole is designed from the outside to the inside along the wellbore tunneling face contour line, and the hole bottom spacing of the discharge hole is 3m;
  • the designed discharge drilling holes are divided into a plurality of nine-stroke and nine-injection units according to a distance of 6m ⁇ 6m, and each of the nine-punch and nine-injection units includes nine drilling holes, and the minimum coal consumption per hole is calculated;
  • each nine-cylinder and nine-injection unit is bored from the outside to the inside, drilled into a 3m with a 133mm drill bit, and then fed into a 3m long D108 ⁇ 5mm seamless steel pipe;
  • the cement slurry is injected into the seamless steel pipe, waiting for the cement slurry to solidify;
  • the fifth step is to drill 3.5m in the seamless steel pipe, and carry out the withstand voltage test on the borehole. After the pressure is passed, the sixth step is carried out. If the withstand voltage is unqualified, return to the fourth step of the step;
  • the steps of the coal-filling construction for completing the drilling of one hole in the nine-cylinder and nine-injection units are as follows;
  • the coal-filling construction of the other eight holes of the nine-cylinder and nine-injection units is completed in sequence, thereby completing the coal-punching construction of a nine-punch and nine-injection unit;
  • a gas inspection hole is constructed in the area of the nine-flush and nine-injection units of the coal-filling construction to determine the gas content. If the gas content is less than the highest gas content capable of eliminating the protrusion, the ninth step is performed if the gas content is greater than or equal to Returning to the sixth step, the highest gas content that can be eliminated;
  • the nine holes of the nine-cylinder and nine-injection units for determining the gas content are cement-reinforced
  • the tenth step repeat the seventh step to the ninth step above, and carry out the coal-filling construction and cement reinforcement for all the nine-cylinder and nine-injection units from the outside to the inside, and complete the pressure relief gas discharge and coal reinforcement in the unloading coal area of the vertical shaft.
  • the amount of coal washed is calculated according to the 3 ⁇ and 20 times coal thickness of the coal in the total control coal, and the large value is taken as the total minimum coal consumption, and the total minimum coal consumption is divided by The total number of holes is drilled, and the minimum coal volume is obtained.
  • the coal thickness is the quality of the coal obtained by taking the thickness of the coal seam.
  • the unit is t.
  • the thickness of the coal seam is proved in the geological borehole of the coal, according to the wellbore.
  • the total control range, coal seam dip angle and thickness of the coal seam are calculated to calculate the volume of the coal body within the control range of the borehole. Then the volume of the coal body in the borehole control area is multiplied by the apparent density of the coal to obtain the total coal quality in the coal mine.
  • the total control range of the coal mining hole is the maximum range enclosed by all the holes.
  • the pressure test procedure is as follows:
  • the gas inspection hole is constructed at the maximum distance between the nine holes of the nine-cylinder and nine-injection units, and the maximum gas volume capable of eliminating the protrusion is equal to the original coal body within the control range of the nine-cylinder and nine-injection units.
  • the gas content is 70% and less than 8m 3 /t, and the control range of the nine-stroke and nine-injection units is the maximum range enclosed by nine drill holes.
  • the cement reinforcement step is: injecting a cement slurry having a water-cement ratio of 1:1 into the nine holes of the nine-cylinder and nine-injection units, the grouting pressure is not less than 6 MPa, and cannot be reached at the initial stage of grouting. At 6 MPa, 9 holes can be filled with cement slurry first, and then injected again after 30 minutes, and so on until the grouting pressure reaches the pressure requirement.
  • the quick relief pressure discharge gas method of the vertical wellbore provided by the present invention for uncovering the extra-thick soft protruding coal seam can realize hydraulic punching of the coal body within the control range of the drilling hole, and the pressure relief expansion of the coal body after flushing out the coal body Deformation, the gas permeability is significantly increased, and the gas emission is accelerated; the invention adopts 9 drill holes as a unit in punching, and the reinforced cement slurry is injected after the punching, thereby avoiding problems such as cracking of the well wall caused by stress change after punching, and strengthening At the same time, during the construction, from the outside to the inside, after completing all the elements of the outermost ring, a protective curtain is formed, which cuts off the passage of gas into the control range, and under the premise of ensuring safety, the single hole discharge is increased. The rapid discharge gas discharge of the extra-thick soft protruding coal seam is realized.
  • Figure 1 is a schematic view of the arrangement of the discharge borehole.
  • a vertical wellbore of the present invention debunks a thick and soft protruding coal seam, and the method for rapidly discharging pressure and discharge gas comprises the following steps:
  • the wellbore is drilled to a position 7m away from the coal seam, and a multi-circle discharge borehole is designed from the outside to the inside along the wellbore tunneling face contour line, and the hole bottom spacing of the discharge hole is 3m;
  • the designed discharge hole is divided into a plurality of nine-stroke and nine-note units according to a distance of 6m ⁇ 6m, and each of the nine-stroke and nine-note units includes nine holes and a single hole is calculated. Minimum amount of coal washed;
  • each nine-cylinder and nine-injection unit is bored from the outside to the inside, drilled into a 3m with a 133mm drill bit, and then fed into a 3m long D108 ⁇ 5mm seamless steel pipe;
  • the cement slurry is injected into the seamless steel pipe, waiting for the cement slurry to solidify;
  • the fifth step is to drill 3.5m in the seamless steel pipe, and carry out the withstand voltage test on the borehole. After the pressure is passed, the sixth step is carried out. If the withstand voltage is unqualified, return to the fourth step of the step;
  • the coal-filling construction of one hole in the nine-cylinder and nine-injection units is completed.
  • the steps of the coal-filling construction are as follows:
  • the coal-filling construction of the other eight holes of the nine-cylinder and nine-injection units is completed in sequence, thereby completing the coal-punching construction of a nine-punch and nine-injection unit;
  • a gas inspection hole is constructed in the area of the nine-flush and nine-injection units of the coal-filling construction to determine the gas content. If the gas content is less than the highest gas content capable of eliminating the protrusion, the ninth step is performed if the gas content is greater than or equal to Returning to the sixth step, the highest gas content that can be eliminated;
  • the nine holes of the nine-cylinder and nine-injection units for determining the gas content are cement-reinforced
  • the tenth step repeat the seventh step to the ninth step above, and carry out the coal-filling construction and cement reinforcement for all the nine-cylinder and nine-injection units from the outside to the inside, and complete the pressure relief gas discharge and coal reinforcement in the unloading coal area of the vertical shaft.
  • the amount of coal washed is calculated according to the 3 ⁇ and 20 times coal thickness of the coal in the total control coal, and the large value is taken as the total minimum coal consumption, and the total minimum coal consumption is divided by the total drilling.
  • Quantity the minimum coal volume per hole is obtained, wherein the coal thickness quality is the empirical coal quality obtained by taking the coal seam thickness value, the unit is t, the coal seam thickness has been proved in the coal mining geological borehole, and the coal mine is drilled according to the wellbore
  • the total control area, coal seam dip angle and thickness are used to calculate the volume of coal in the borehole control range. Then the coal volume in the borehole control area is multiplied by the apparent density of the coal to obtain the total control coal quality in the borehole.
  • the total hole control range is the maximum range enclosed by all drill holes.
  • the pressure test procedure is as follows:
  • the gas inspection hole construction is at the maximum distance between the nine holes of the nine-cylinder and nine-injection units, and the maximum gas volume that can be eliminated is equal to the original gas content of the coal within the control range of the nine-cylinder and nine-injection units. 70% and less than 8m 3 /t, wherein the nine-stroke and nine-injection unit control range is the maximum range enclosed by 9 holes.
  • the cement reinforcement step is: injecting cement with a water-cement ratio of 1:1 to the nine holes of the nine-cylinder and nine-injection units.
  • Pulp, grouting pressure is not less than 6MPa, when the initial grouting can not reach 6MPa, you can first fill 9 holes with cement slurry, and then inject again after 30min, so repeated until the grouting pressure reaches the pressure requirement.

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Abstract

公开了一种立井井筒揭穿特厚松软突出煤层的快速卸压排放瓦斯方法，包括以下步骤：沿井筒掘进工作面轮廓线设计多圈排放钻孔；将排放钻孔划分为多个九冲、九注单元；对每个九冲、九注单元进行钻孔施工；对钻孔进行耐压试验；依次完成九冲、九注单元9个钻孔的冲煤施工；在完成冲煤施工的九冲、九注单元区域内施工瓦斯检查孔，测定瓦斯含量；对完成瓦斯含量测定的九冲、九注单元的9个钻孔进行水泥加固；依次对所有九冲、九注单元进行冲煤施工和水泥加固。该方法避免了冲孔后应力变化造成井壁开裂等问题，且加固了煤体，在保证安全的前提下，加大了单孔排放量，实现了特厚松软突出煤层的快速卸压瓦斯排放。

Description

立井井筒揭穿特厚松软突出煤层的快速卸压排放瓦斯方法 技术领域
本发明涉及井下立井井筒揭穿特厚松软突出煤层的快速卸压排放瓦斯方法，适用于立井井筒工作面狭小的特厚松软突出煤层消突排放瓦斯。
背景技术
目前《防治煤与瓦斯突出规定》中第第四十九条第(四)款规定：穿层钻孔预抽石门(含立、斜井等)揭煤区域煤层瓦斯区域防突措施应当在揭煤工作面距煤层的最小法向距离7m以前实施(在构造破坏带应适当加大距离)。钻孔的最小控制范围是：石门和立井、斜井揭煤处巷道轮廓线外12m(急倾斜煤层底部或下帮6m)，同时还应当保证控制范围的外边缘到巷道轮廓线(包括预计前方揭煤段巷道的轮廓线)的最小距离不小于5m，且当钻孔不能一次穿透煤层全厚时，应当保持煤孔最小超前距15m。
按照以上规定，钻孔需要控制到立井井筒轮廓线至见煤点12m位置，特厚煤层由于煤层厚度较大，所以按照规定，设计钻孔穿过煤体后，需要排放瓦斯的范围十分巨大。同时，对于松软煤层来说，透气性差，下向钻孔容易受水封影响，造成瓦斯排放困难，单孔控制范围较小。基于以上因素，采用传统的瓦斯排放方法，钻孔数量巨大，狭小的井筒工作面，无法进行施工。为增加排放量，减少钻孔数量，需要采用水力化措施进行钻孔卸压增透，但冲孔后，冲煤量越大，应力变化越剧烈，对井壁影响越明显，严重时造成井壁开裂。所以，快速卸压排放瓦斯，达到消突效果，且不对立井井筒产生影响，成为揭穿特厚松软突出煤层的主要问题。
发明内容
发明目的：本发明的目的是要克服已有技术中存在的上述问题，提供一种可靠的立井井筒揭穿特厚松软突出煤层的快速卸压排放瓦斯方法。
为了实现上述目的，本发明采用了如下的技术方案：一种立井井筒揭穿特厚松软突出煤层的快速卸压排放瓦斯方法，包括以下步骤：
第一步，在井筒掘进至距离煤层7m位置，沿井筒掘进工作面轮廓线由外至内设计多圈排放钻孔，排放钻孔的孔底间距为3m；
第二步，将设计好的排放钻孔按照6m×6m间距划分为多个九冲、九注单元，每个九冲、九注单元包含9个钻孔，并计算单孔最小冲煤量；
第三步，由外向内对每个九冲、九注单元进行钻孔施工，以133mm钻头钻进3m，然后送入3m长的D108×5mm无缝钢管；
第四步，向无缝钢管中注入水泥浆，等待水泥浆凝固；
第五步，在无缝钢管中钻进3.5m，对钻孔进行耐压试验，耐压合格后，进行第六步，若耐压不合格，则返回步骤第四步；
第六步，完成九冲、九注单元内1个钻孔的冲煤施工冲煤施工步骤如下；
继续钻进至煤层，打开井筒静水压力水开关，缓慢钻进，在0.5m范围内反复进退 20min，然后继续缓慢钻进0.5m，反复进退20min，如此循环直至钻孔穿过煤层，钻孔穿入煤层后记录冲孔总出煤质量，当出煤量达到单孔最小冲煤量并穿透煤层后，停止钻进，否则继续往返钻进，直至出煤量达到单孔最小冲煤量，从而完成单个钻孔的冲煤施工；
第七步，按照第六步，依次完成九冲、九注单元其它8个钻孔的冲煤施工，从而完成一个九冲、九注单元的冲煤施工；
第八步，在完成冲煤施工的九冲、九注单元区域内施工一个瓦斯检查孔，测定瓦斯含量，如果瓦斯含量小于能够消突的最高瓦斯含量，进行第九步，如果瓦斯含量大于等于能够能够消突的最高瓦斯含量，则返回第六步；
第九步，对完成瓦斯含量测定的九冲、九注单元的9个钻孔进行水泥加固；
第十步，重复以上第七步至第九步，由外至内依次对所有九冲、九注单元进行冲煤施工和水泥加固，完成立井井筒揭煤区域的卸压瓦斯排放及煤体加固。
进一步的，第二步中，冲煤量按照钻孔总控制煤体内煤质量的3‰和20倍煤厚质量分别计算，取大值作为总最小冲煤量，以总最小冲煤量除以总钻孔数量，得到单孔最小冲煤量，其中，煤厚质量是通过取煤层厚度数值得到的经验冲煤质量，单位为t，煤层厚度在揭煤地质钻孔中已探明，按照井筒揭煤钻孔总控制范围、煤层倾角、厚度计算出钻孔控制范围内煤体体积，然后钻孔控制范围内煤体体积乘以煤的视相对密度得到钻孔总控制煤体内煤质量，井筒揭煤钻孔总控制范围为所有钻孔围成的最大范围。
进一步的，第五步中，耐压试验步骤如下：
1)使用注浆泵向钻孔缓慢注入清水，一边注浆一边观察：
2)待注水压力上升至6MPa并且钻孔孔口不漏水时，停止注水：
5)利用秒表计时，如果在5min内压力不下降，则耐压试验合格。
进一步的，第八步中，瓦斯检查孔施工在九冲、九注单元的9个钻孔中相互间距最大位置，能够消突的最高瓦斯量等于九冲、九注单元控制范围内煤体原始瓦斯含量的70％且小于8m3/t，其中九冲、九注单元控制范围为9个钻孔围成的最大范围。
进一步的，第九步中，水泥加固步骤为：向九冲、九注单元的9个钻孔注入水灰比为1∶1的水泥浆，注浆压力不小于6MPa，当注浆初期不能达到6MPa时，可先将9个钻孔注满水泥浆，30min后再次注入一遍，如此反复直至注浆压力达到压力要求。
有益效果：应用本发明提供的立井井筒揭穿特厚松软突出煤层的快速卸压排放瓦斯方法，能对钻孔控制范围内的煤体实现水力冲孔，冲出煤体后，煤体卸压膨胀变形，透气性显著增加，加快瓦斯排放；本发明在冲孔时以9个钻孔为一单元，冲完注入加固水泥浆，避免了冲孔后应力变化造成井壁开裂等问题，且加固了煤体，同时，在施工时由外向内，完成最外圈所有单元后，形成保护帷幕，截断了瓦斯向控制范围内渗透的通道，在保证安全的前提下，加大了单孔排放量，实现了特厚松软突出煤层的快速卸压瓦斯排放。
附图说明
图1为排放钻孔的布置示意图。
图中：1-井简掘进工作面轮廓线，2-九冲、九注单元，3-瓦斯检查孔。
具体实施方式：
下面结合附图对本发明做更进一步的解释。
本发明的一种立井井筒揭穿特厚松软突出煤层九冲九注快速卸压排放瓦斯方法包括以下步骤：
第一步，在井筒掘进至距离煤层7m位置，沿井筒掘进工作面轮廓线由外至内设计多圈排放钻孔，排放钻孔的孔底间距为3m；
第二步，如图所示，将设计好的排放钻孔按照6m×6m间距划分为多个九冲、九注单元，每个九冲、九注单元包含9个钻孔，并计算单孔最小冲煤量；
第三步，由外向内对每个九冲、九注单元进行钻孔施工，以133mm钻头钻进3m，然后送入3m长的D108×5mm无缝钢管；
第四步，向无缝钢管中注入水泥浆，等待水泥浆凝固；
第五步，在无缝钢管中钻进3.5m，对钻孔进行耐压试验，耐压合格后，进行第六步，若耐压不合格，则返回步骤第四步；
第六步，完成九冲，九注单元内1个钻孔的冲煤施工，冲煤施工步骤如下：
继续钻进至煤层，打开井筒静水压力水开关，缓慢钻进，在0.5m范围内反复进退20min，然后继续缓慢钻进0.5m，反复进退20min，如此循环直至钻孔穿过煤层，钻孔穿入煤层后记录冲孔总出煤质量，当出煤量达到单孔最小冲煤量并穿透煤层后，停止钻进，否则继续往返钻进，直至出煤量达到单孔最小冲煤量，从而完成单个钻孔的冲煤施工；
第七步，按照第六步，依次完成九冲、九注单元其它8个钻孔的冲煤施工，从而完成一个九冲、九注单元的冲煤施工；
第八步，在完成冲煤施工的九冲、九注单元区域内施工一个瓦斯检查孔，测定瓦斯含量，如果瓦斯含量小于能够消突的最高瓦斯含量，进行第九步，如果瓦斯含量大于等于能够能够消突的最高瓦斯含量，则返回第六步；
第九步，对完成瓦斯含量测定的九冲、九注单元的9个钻孔进行水泥加固；
第十步，重复以上第七步至第九步，由外至内依次对所有九冲、九注单元进行冲煤施工和水泥加固，完成立井井筒揭煤区域的卸压瓦斯排放及煤体加固。
第二步中，冲煤量按照钻孔总控制煤体内煤质量的3‰和20倍煤厚质量分别计算，取大值作为总最小冲煤量，以总最小冲煤量除以总钻孔数量，得到单孔最小冲煤量，其中，煤厚质量是通过取煤层厚度数值得到的经验冲煤质量，单位为t，煤层厚度在揭煤地质钻孔中已探明，按照井筒揭煤钻孔总控制范围、煤层倾角、厚度计算出钻孔控制范围内煤体体积，然后钻孔控制范围内煤体体积乘以煤的视相对密度得到钻孔总控制煤体内煤质量，井筒揭煤钻孔总控制范围为所有钻孔围成的最大范围。
第五步中，耐压试验步骤如下：
1)使用注浆泵向钻孔缓慢注入清水，一边注浆一边观察；
2)待注水压力上升至6MPa并且钻孔孔口不漏水时，停止注水；
5)利用秒表计时，如果在5min内压力不下降，则耐压试验合格。
第八步中，瓦斯检查孔施工在九冲、九注单元的9个钻孔中相互间距最大位置，能够消突的最高瓦斯量等于九冲、九注单元控制范围内煤体原始瓦斯含量的70％且小于8m3/t，其中九冲、九注单元控制范围为9个钻孔围成的最大范围。
第九步中，水泥加固步骤为：向九冲、九注单元的9个钻孔注入水灰比为1∶1的水泥 浆，注浆压力不小于6MPa，当注浆初期不能达到6MPa时，可先将9个钻孔注满水泥浆，30min后再次注入一遍，如此反复直至注浆压力达到压力要求。
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。

Claims (5)

  1. 一种立井井筒揭穿特厚松软突出煤层的快速卸压排放瓦斯方法，其特征在于，包括以下步骤：
    第一步，在井筒掘进至距离煤层7m位置，沿井筒掘进工作面轮廓线由外至内设计多圈排放钻孔，排放钻孔的孔底间距为3m；
    第二步，将设计好的排放钻孔按照6m×6m间距划分为多个九冲、九注单元，每个九冲、九注单元包含9个钻孔，并计算单孔最小冲煤量；
    第三步，由外向内对每个九冲、九注单元进行钻孔施工，以133mm钻头钻进3m，然后送入3m长的D108×5mm无缝钢管；
    第四步，向无缝钢管中注入水泥浆，等待水泥浆凝固；
    第五步，在无缝钢管中钻进3.5m，对钻孔进行耐压试验，耐压合格后，进行第六步，若耐压不合格，则返回步骤第四步；
    第六步，完成九冲、九注单元内1个钻孔的冲煤施工，冲煤施工步骤如下：
    继续钻进至煤层，打开井筒静水压力水开关，缓慢钻进，在0.5m范围内反复进退20min，然后继续缓慢钻进0.5m，反复进退20min，如此循环直至钻孔穿过煤层，钻孔穿入煤层后记录冲孔总出煤质量，当出煤量达到单孔最小冲煤量并穿透煤层后，停止钻进，否则继续往返钻进，直至出煤量达到单孔最小冲煤量，从而完成单个钻孔的冲煤施工；
    第七步，按照第六步，依次完成九冲，九注单元其它8个钻孔的冲煤施工，从而完成一个九冲，九注单元的冲煤施工；
    第八步，在完成冲煤施工的九冲、九注单元区域内施工一个瓦斯检查孔，测定瓦斯含量，如果瓦斯含量小于能够消突的最高瓦斯含量，进行第九步，如果瓦斯含量大于等于能够能够消突的最高瓦斯含量，则返回第六步；
    第九步，对完成瓦斯含量测定的九冲、九注单元的9个钻孔进行水泥加固；
    第十步，重复以上第七步至第九步，由外至内依次对所有九冲、九注单元进行冲煤施工和水泥加固，完成立井井筒揭煤区域的卸压瓦斯排放及煤体加固。
  2. 根据权利要求1所述的一种立井井筒揭穿特厚松软突出煤层的快速卸压排放瓦斯方法，其特征在于：
    第二步中，冲煤量按照钻孔总控制煤体内煤质量的3‰和20倍煤厚质量分别计算，取大值作为总最小冲煤量，以总最小冲煤量除以总钻孔数量，得到单孔最小冲煤量，其中，煤厚质量是通过取煤层厚度数值得到的经验冲煤质量，单位为t，煤层厚度在揭煤地质钻孔中已探明，按照井筒揭煤钻孔总控制范围、煤层倾角、厚度计算出钻孔控制范围内煤体体积，然后钻孔控制范围内煤体体积乘以煤的视相对密度得到钻孔总控制煤体内煤质量，井筒揭煤钻孔总控制范围为所有钻孔围成的最大范围。
  3. 根据权利要求1所述的一种立井井筒揭穿特厚松软突出煤层的快速卸压排放瓦斯方法，其特征在于：第五步中，耐压试验步骤如下：
    1)使用注浆泵向钻孔缓慢注入清水，一边注浆一边观察；
    2)待注水压力上升至6MPa并且钻孔孔口不漏水时，停止注水；
    5)利用秒表计时，如果在5min内压力不下降，则耐压试验合格。
  4. 根据权利要求1所述的一种立井井筒揭穿特厚松软突出煤层的快速卸压排放瓦斯方法，其特征在于：第八步中，瓦斯检查孔施工在九冲、九注单元的9个钻孔中相互间距最大位 置，能够消突的最高瓦斯量等于九冲、九注单元控制范围内煤体原始瓦斯含量的70％且小于8m3/t，其中九冲、九注单元控制范围为9个钻孔围成的最大范围。
  5. 根据权利要求1所述的一种立井井筒揭穿特厚松软突出煤层的快速卸压排放瓦斯方法，其特征在于：第九步中，水泥加固步骤为：向九冲、九注单元的9个钻孔注入水灰比为1∶1的水泥浆，注浆压力不小于6MPa，当注浆初期不能达到6MPa时，可先将9个钻孔注满水泥浆，30min后再次注入一遍，如此反复直至注浆压力达到压力要求。
PCT/CN2017/000659 2016-11-04 2017-11-02 立井井筒揭穿特厚松软突出煤层的快速卸压排放瓦斯方法 Ceased WO2018082201A1 (zh)

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