技术领域technical field
本发明属于煤矿开采施工技术领域，具体涉及一种基于孔眼支护的煤矿顶板卸压方法。The invention belongs to the technical field of coal mine mining and construction, and in particular relates to a coal mine roof pressure relief method based on hole support.
背景技术Background technique
冲击地压又称岩爆，是一种岩体中聚积的弹性变形势能在一定条件下突然猛烈释放，导致岩石急剧破坏的现象。在煤矿开采过程中，煤层上方厚而坚硬砂岩顶板是影响冲击地压发生的主要因素之一，对矿井、井下人员和设备具有重大威胁。采用超前导硐、宽巷掘进、爆破、钻孔、煤层注水或压裂等方式卸压，将顶板破断，降低顶板释放因应力集中而产生的能量，减少顶板由于采动影响和时间效应而产生的断裂对煤层和支架的冲击振动，可以有效地降低冲击地压危险性。Rockburst, also known as rockburst, is a phenomenon in which the elastic variable energy accumulated in rock mass is suddenly and violently released under certain conditions, resulting in rapid rock destruction. In the process of coal mining, the thick and hard sandstone roof above the coal seam is one of the main factors affecting the occurrence of rock burst, which poses a major threat to mines, underground personnel and equipment. Adopt methods such as advanced pilot tunnel, wide roadway excavation, blasting, drilling, coal seam water injection or fracturing to relieve pressure, break the roof, reduce the energy generated by the roof release due to stress concentration, and reduce the impact of the roof due to mining and time effects. The impact and vibration of the fracture on the coal seam and the support can effectively reduce the risk of rock burst.
其中，水力压裂进行顶板卸压是近年来发展起来的新开采技术，将用于油气井的压裂技术移用到顶板卸压上来。其基本过程类似于油气井的压裂开采，即先钻孔眼到顶板层，然后放入射孔和压裂工具进行射孔压裂。不同点在于，由于孔眼小于一般的油气井，因而钻孔完成后无法进行混凝土固井，顶板应力随时间变化，孔眼壁易出现坍塌导致孔眼堵塞，射孔工具无法布置或射孔被迫中断，后续卸压施工无法继续。特别是在钻长孔眼后，由于极易出现部分位置的坍塌，现有技术下通常在钻眼完成后马上布置射孔工具，但孔眼内需要多次多位点射孔，该过程中孔眼坍塌的威胁始终存在。因此，需要一种能够预防孔眼坍塌的顶板卸压方法，以便于后续射孔和压裂。Among them, hydraulic fracturing for roof pressure relief is a new mining technology developed in recent years, which transfers the fracturing technology used for oil and gas wells to roof pressure relief. The basic process is similar to the fracturing of oil and gas wells, that is, drilling holes to the roof layer, and then putting in perforation and fracturing tools for perforation and fracturing. The difference is that because the holes are smaller than ordinary oil and gas wells, concrete cementing cannot be carried out after the drilling is completed, the roof stress changes with time, the hole walls are prone to collapse and the holes are blocked, and the perforation tools cannot be arranged or the perforation is forced to be interrupted. Subsequent pressure relief construction cannot continue. Especially after the long hole is drilled, because some parts are prone to collapse, under the prior art, the perforating tools are usually arranged immediately after the drilling is completed, but multiple multi-point perforations are required in the hole, and the hole collapses during the process. Threats are always there. Therefore, there is a need for a roof decompression method that can prevent perforation collapse for subsequent perforation and fracturing.
发明内容Contents of the invention
有鉴于此，本发明提供一种基于孔眼支护的煤矿顶板卸压方法。In view of this, the present invention provides a coal mine roof pressure relief method based on hole support.
其技术方案如下：Its technical scheme is as follows:
一种基于孔眼支护的煤矿顶板卸压方法，其关键在于按以下步骤进行：A coal mine roof pressure relief method based on hole support, the key lies in the following steps:
步骤一，钻孔眼，在煤层上方的顶板钻孔施工，形成卸压孔眼；Step 1, drilling holes, drilling construction on the roof above the coal seam to form pressure relief holes;
步骤二，孔眼支护，向所述卸压孔眼内放入膨胀管柱并扩张该膨胀管柱以支护所述卸压孔眼的孔壁；Step 2, hole support, putting an expansion string into the pressure relief hole and expanding the expansion string to support the hole wall of the pressure relief hole;
步骤三，试压，确定所述膨胀管柱密封良好；Step 3, pressure testing, to determine that the expansion string is well sealed;
步骤四，射孔，放置射孔工具到预射孔位置进行射孔；Step 4, perforating, placing the perforating tool to the pre-perforation position for perforating;
步骤五，压裂。Step five, fracturing.
采用以上方法，在卸压孔眼内放入膨胀管柱并将其扩张对孔壁进行支护，有效防止了孔壁坍塌，为后续射孔和压裂施工提供稳定的条件，并且孔眼支护所采用的膨胀管工具和膨胀工艺均为现有技术，膨胀管柱原始直径较小便于放入卸压孔眼内，放入后扩张膨胀即对卸压孔眼形成稳定支护。Using the above method, the expansion string is placed in the pressure relief hole and expanded to support the hole wall, which effectively prevents the hole wall from collapsing and provides stable conditions for subsequent perforation and fracturing construction. The expansion pipe tool and expansion process used are all existing technologies. The original diameter of the expansion pipe string is small so that it can be placed in the pressure relief hole. After being placed, it expands and expands to form a stable support for the pressure relief hole.
作为优选技术方案，上述步骤一中，从煤矿巷道内斜向上向所述顶板钻孔，并在所述顶板内沿水平方向继续延伸钻孔。As a preferred technical solution, in the above step 1, holes are drilled obliquely upwards from the coal mine roadway to the roof, and the holes are continuously extended in the roof along the horizontal direction.
采用以上方法，形成的卸压孔眼大部分位于顶板的合适深度，便于后续压裂使顶板破坏。With the above method, most of the pressure relief holes formed are located at the proper depth of the roof, which is convenient for subsequent fracturing to damage the roof.
作为优选技术方案，在竖直方向上，所述卸压孔眼的水平段位于所述顶板的中间。As a preferred technical solution, in the vertical direction, the horizontal section of the pressure relief hole is located in the middle of the top plate.
采用以上设计，使得压裂裂缝在竖直方向尽可能贯穿顶板。The above design is adopted to make the fracturing fracture penetrate the roof as much as possible in the vertical direction.
作为优选技术方案，上述卸压孔眼的设计深度大于300m。As a preferred technical solution, the design depth of the pressure relief hole is greater than 300m.
采用以上设计，是因为卸压孔眼深度大则后续压裂范围大，在引入膨胀管支护操作后，卸压孔眼较稳定，允许钻出更深的卸压孔眼，减少压裂过程中的钻孔次数。The above design is adopted because the depth of the pressure relief hole is large, and the subsequent fracturing range is large. After the expansion pipe support operation is introduced, the pressure relief hole is more stable, allowing deeper pressure relief holes to be drilled, reducing the drilling time during the fracturing process frequency.
作为优选技术方案，上述步骤二中，先设置好膨胀系统；As a preferred technical solution, in the above-mentioned step 2, the expansion system is first set;
所述膨胀系统包括膨胀管柱、膨胀锥和膨胀堵头；The expansion system includes an expansion string, an expansion cone and an expansion plug;
所述膨胀管柱由至少两段膨胀管沿着同一直线方向依次连接至设计长度而成；The expansion pipe string is formed by connecting at least two sections of expansion pipes to the designed length sequentially along the same straight line direction;
所述膨胀锥从所述膨胀管柱的任一自由端进入并嵌套在所述膨胀管柱内，该膨胀锥所在的自由端为所述膨胀管柱的头部，所述膨胀管柱的另一端为尾部；The expansion cone enters from any free end of the expansion string and is nested in the expansion string. The free end where the expansion cone is located is the head of the expansion string. The other end is the tail;
所述膨胀堵头包括堵头座和封堵球，所述堵头座固定设置在所述膨胀管柱的头部，所述堵头座位于所述膨胀锥前方，所述封堵球备用；The expansion plug includes a plug seat and a plugging ball, the plug seat is fixedly arranged at the head of the expansion string, the plug seat is located in front of the expansion cone, and the plugging ball is for standby;
所述膨胀锥还连接有连续油管，该连续油管的自由端与所述膨胀锥相连，该连续油管的固定端从所述膨胀管柱的尾部伸出；The expansion cone is also connected with a coiled tubing, the free end of the coiled tubing is connected with the expansion cone, and the fixed end of the coiled tubing stretches out from the tail of the expansion string;
然后通过所述连续油管将所述膨胀管柱放置到所述卸压孔眼内，再扩张所述膨胀管柱。The expansion string is then placed into the pressure relief hole through the coiled tubing, and the expansion string is expanded.
采用以上设计，便于膨胀管柱的放置和扩张。The above design facilitates the placement and expansion of the expansion string.
作为优选技术方案，上述膨胀管柱伸入所述卸压孔眼直至其头部到达所述卸压孔眼的孔底，然后回拖所述膨胀管柱到达预定支护位置。As a preferred technical solution, the expansion pipe string extends into the pressure relief hole until its head reaches the bottom of the pressure relief hole, and then drags the expansion pipe string back to a predetermined support position.
采用以上设计，根据卸压孔眼的深度和伸入的连续油管的长度，可以方便地确定在膨胀管柱在所述卸压孔眼内的位置。With the above design, according to the depth of the pressure relief hole and the length of the extended coiled tubing, the position of the expansion string in the pressure relief hole can be conveniently determined.
作为优选技术方案，上述膨胀管柱放置到所述卸压孔眼内后，从所述连续油管的井口端投入所述封堵球，并注入少量液体，使该封堵球穿过所述膨胀锥的内孔后坐在所述堵头座上，形成密封的所述膨胀堵头，该膨胀堵头与所述膨胀锥之间的所述膨胀管柱的内腔形成膨胀腔；As a preferred technical solution, after the above-mentioned expansion string is placed in the pressure relief hole, the plugging ball is put into the wellhead end of the coiled tubing, and a small amount of liquid is injected to make the plugging ball pass through the expansion cone The inner hole of the inner hole sits on the plug seat to form a sealed expansion plug, and the inner cavity of the expansion string between the expansion plug and the expansion cone forms an expansion cavity;
再通过所述连续油管向所述膨胀腔内注入高压液体，以使所述膨胀腔对应的所述膨胀管柱扩张，高压液体推动所述膨胀锥向所述膨胀管柱的尾部移动，与此同时回退所述连续油管，使得所述膨胀管柱从头部到尾部逐渐扩张以支撑所述卸压孔眼的内壁。Then inject high-pressure liquid into the expansion chamber through the coiled tubing, so as to expand the expansion string corresponding to the expansion chamber, and the high-pressure liquid pushes the expansion cone to move to the tail of the expansion string. At the same time, the coiled tubing is retreated, so that the expansion string gradually expands from the head to the tail to support the inner wall of the pressure relief hole.
采用以上设计，膨胀管的扩张技术很成熟。With the above design, the expansion technology of the expansion tube is very mature.
作为优选技术方案，使用所述连续油管放置射孔工具至所述膨胀管柱内的预射孔位置，从所述连续油管泵入高压磨料水进行射孔，然后回拖所述射孔工具，沿着所述卸压孔眼的底部到出口方向在多个位置射孔。As a preferred technical solution, the coiled tubing is used to place the perforating tool to the pre-perforation position in the expansion string, pump high-pressure abrasive water from the coiled tubing to perform perforation, and then drag the perforating tool back, Perforations are perforated at various locations along the bottom of the pressure relief perforation to the outlet.
采用以上方法，对卸压孔眼分段射孔。The above method is used to perforate the pressure relief holes in sections.
作为优选技术方案，射孔完成后，起出所述射孔工具，使用所述连续油管安放压裂管柱到所述膨胀管柱内，所述压裂管柱两端分别设有液压封隔器，两个所述液压封隔器连接有同一根供液导管，该供液导管沿着所述连续油管设置；As a preferred technical solution, after the perforation is completed, the perforating tool is pulled out, and the coiled tubing is used to place a fracturing string into the expansion string, and hydraulic seals are provided at both ends of the fracturing string The two hydraulic packers are connected with the same liquid supply conduit, and the liquid supply conduit is arranged along the coiled tubing;
首先放置所述压裂管柱至所述卸压孔眼底部的射孔位置，通过所述供液导管加压至两个所述液压封隔器膨胀并分别座封到所述射孔位置前方和后方的所述膨胀管柱内壁，然后向所述压裂管柱中注入压裂液，完成一个层段压裂；First place the fracturing string to the perforation position at the bottom of the pressure relief hole, pressurize through the liquid supply conduit until the two hydraulic packers expand and are respectively set to the front of the perforation position and expanding the inner wall of the string at the rear, and then injecting fracturing fluid into the fracturing string to complete the fracturing of a layer;
再卸压使所述液压封隔器收缩，回拖所述压裂管柱至下一个射孔位置，重复压裂过程，完成整个所述卸压孔眼的分段压裂。The pressure is released again to make the hydraulic packer shrink, and the fracturing string is dragged back to the next perforation position, and the fracturing process is repeated to complete the staged fracturing of the entire pressure relief hole.
采用以上方法，便于对顶板进行压裂。By adopting the above method, it is convenient to fracturing the roof.
与现有技术相比，本发明的有益效果：利用膨胀管柱对卸压孔眼的孔壁进行支护，有效防止了孔壁坍塌，为后续射孔和压裂施工提供稳定的条件，从而允许钻长孔眼以进行大范围地顶板卸压，降低冲击地压危险性，提高后续开采的安全性。Compared with the prior art, the present invention has the beneficial effects: using the expansion string to support the hole wall of the pressure relief hole, effectively preventing the hole wall from collapsing, and providing stable conditions for subsequent perforation and fracturing construction, thus allowing Drilling long holes for large-scale roof pressure relief, reducing the risk of rock burst and improving the safety of subsequent mining.
附图说明Description of drawings
图1为卸压孔眼的位置示意图；Figure 1 is a schematic diagram of the position of the pressure relief hole;
图2为膨胀系统的结构示意图；Fig. 2 is the structural representation of expansion system;
图3为膨胀管柱放置到卸压孔眼内的示意图；Fig. 3 is a schematic diagram of placing the expansion string into the pressure relief hole;
图4为投入封堵球并使之座封堵头座的示意图；Fig. 4 is the schematic diagram of dropping into the plugging ball and making it block the head seat;
图5为膨胀管柱扩张并支护卸压孔眼的示意图；Fig. 5 is a schematic diagram of the expansion of the expansion string and the support of the pressure relief hole;
图6为放置射孔工具到卸压孔眼进行射孔的示意图；Fig. 6 is a schematic diagram of placing the perforating tool to the pressure relief hole for perforating;
图7为放置压裂管柱到卸压孔眼进行分段压裂的示意图；Fig. 7 is a schematic diagram of placing a fracturing string into a pressure relief hole for staged fracturing;
图8为顶板被压裂后的示意图。Figure 8 is a schematic view of the roof after it has been fractured.
具体实施方式Detailed ways
以下结合实施例和附图对本发明作进一步说明。The present invention will be further described below in conjunction with embodiment and accompanying drawing.
一种基于孔眼支护的煤矿顶板卸压方法，按以下步骤进行：A coal mine roof pressure relief method based on hole support, which is carried out according to the following steps:
步骤一，钻孔眼。如图1所示，从煤矿巷道a的顶部斜向上向煤层b上方的顶板c钻孔，钻眼角度为30～60°，并在所述顶板c内沿水平方向继续延伸钻孔，形成卸压孔眼1，所述卸压孔眼1的内径在50mm左右。在竖直方向上，所述卸压孔眼1的水平段位于所述顶板c的中间层。Step one, drill holes. As shown in Figure 1, a hole is drilled obliquely upwards from the top of the coal mine roadway a to the roof c above the coal seam b. Pressure hole 1, the inner diameter of the pressure relief hole 1 is about 50mm. In the vertical direction, the horizontal section of the pressure relief hole 1 is located in the middle layer of the top plate c.
步骤二，孔眼支护。向所述卸压孔眼1内放入膨胀管柱21并扩张该膨胀管柱以支护所述卸压孔眼1的孔壁。Step two, hole support. Put the expansion string 21 into the pressure relief hole 1 and expand the expansion string to support the hole wall of the pressure relief hole 1 .
具体地，先设置好膨胀系统，如图2所示，该膨胀系统包括膨胀管柱21、膨胀锥22和膨胀堵头23。Specifically, an expansion system is set up first, as shown in FIG. 2 , the expansion system includes an expansion string 21 , an expansion cone 22 and an expansion plug 23 .
所述膨胀管柱21由至少两段膨胀管沿着同一直线方向依次连接至设计长度而成；所述膨胀锥22从所述膨胀管柱21的任一自由端进入并嵌套在所述膨胀管柱21内，该膨胀锥22所在的自由端为所述膨胀管柱21的头部，所述膨胀管柱21的另一端为尾部；所述膨胀堵头23包括堵头座23a和封堵球23b，所述堵头座23a固定设置在所述膨胀管柱的头部，所述堵头座23a位于所述膨胀锥22前方，所述封堵球23b备用。The expansion string 21 is composed of at least two sections of expansion tubes sequentially connected to the designed length along the same straight line; the expansion cone 22 enters from any free end of the expansion string 21 and is nested in the expansion tube. In the pipe string 21, the free end where the expansion cone 22 is located is the head of the expansion pipe string 21, and the other end of the expansion pipe string 21 is the tail; the expansion plug 23 includes a plug seat 23a and a plugging The ball 23b, the plug seat 23a is fixedly arranged at the head of the expansion column, the plug seat 23a is located in front of the expansion cone 22, and the plug ball 23b is for standby.
所述膨胀锥22还连接有连续油管3，该连续油管3的自由端与所述膨胀锥22相连，该连续油管3的固定端从所述膨胀管柱21的尾部伸出。通过所述连续油管3将所述膨胀管柱21放置到所述卸压孔眼1内，再扩张所述膨胀管柱21。The expansion cone 22 is also connected with a coiled tubing 3 , the free end of the coiled tubing 3 is connected with the expansion cone 22 , and the fixed end of the coiled tubing 3 protrudes from the tail of the expansion string 21 . The expansion string 21 is placed in the pressure relief hole 1 through the coiled tubing 3 , and then the expansion string 21 is expanded.
如图3所示，所述膨胀管柱21伸入所述卸压孔眼1直至其头部到达所述卸压孔眼1的孔底，然后回拖所述膨胀管柱21到达预定支护位置。再从所述连续油管3的井口端投入所述封堵球23b，并注入少量液体，使该封堵球23b穿过所述膨胀锥22的内孔后坐在所述堵头座23a上，形成密封的所述膨胀堵头23，该膨胀堵头23与所述膨胀锥22之间的所述膨胀管柱21的内腔形成膨胀腔4。此时如图4所示。As shown in FIG. 3 , the expansion string 21 extends into the pressure relief hole 1 until its head reaches the bottom of the pressure relief hole 1 , and then drags the expansion string 21 back to a predetermined support position. Then drop the plugging ball 23b from the wellhead end of the coiled tubing 3, and inject a small amount of liquid, so that the plugging ball 23b passes through the inner hole of the expansion cone 22 and sits on the plug seat 23a to form The expansion plug 23 is sealed, and the inner cavity of the expansion string 21 between the expansion plug 23 and the expansion cone 22 forms an expansion cavity 4 . At this time, it is shown in FIG. 4 .
然后通过所述连续油管3向所述膨胀腔4内注入高压液体，以使所述膨胀腔4对应的所述膨胀管柱21扩张，高压液体推动所述膨胀锥22向所述膨胀管柱21的尾部移动，与此同时回退所述连续油管3，使得所述膨胀管柱21从头部到尾部逐渐扩张以支撑所述卸压孔眼1的内壁。扩张完成后的膨胀管柱21如图5所示。膨胀管的扩张也可以使用普通油管代替所述连续油管3。Then inject high-pressure liquid into the expansion chamber 4 through the coiled tubing 3, so that the expansion string 21 corresponding to the expansion chamber 4 expands, and the high-pressure liquid pushes the expansion cone 22 toward the expansion string 21 At the same time, the coiled tubing 3 is retreated, so that the expansion string 21 gradually expands from the head to the tail to support the inner wall of the pressure relief hole 1 . The expanded tubing string 21 after expansion is shown in FIG. 5 . The expansion of the expansion tube can also use ordinary tubing instead of the coiled tubing 3 .
步骤三，试压。通过所述连续油管3注水保压，试压压强小于所述膨胀管柱21的抗内压强度，以确定所述膨胀管柱21密封良好，为后续封隔井段，实施压裂做准备。Step three, pressure test. Through the coiled tubing 3 for water injection and pressure maintenance, the pressure test pressure is lower than the internal pressure resistance of the expansion string 21 to confirm that the expansion string 21 is well sealed and prepare for subsequent isolation of the well section and implementation of fracturing.
步骤四，射孔。如图6所示，使用所述连续油管3放置射孔工具5至所述膨胀管柱21内的预射孔位置，从所述连续油管3泵入高压磨料水进行射孔，然后回拖所述射孔工具5，沿着所述卸压孔眼1的底部到出口方向在多个位置射孔。射孔完成后，起出所述射孔工具5。Step four, perforating. As shown in Figure 6, use the coiled tubing 3 to place the perforating tool 5 to the pre-perforation position in the expansion string 21, pump high-pressure abrasive water from the coiled tubing 3 to perform perforation, and then drag the tool back The perforating tool 5 is used to perforate at multiple positions along the direction from the bottom of the pressure relief hole 1 to the outlet. After the perforation is completed, the perforating tool 5 is pulled out.
步骤五，压裂。如图7所示，使用所述连续油管3安放压裂管柱6到所述膨胀管柱21内，所述压裂管柱6两端分别设有液压封隔器7，两个所述液压封隔器7连接有同一根供液导管7a，该供液导管7a沿着所述连续油管3设置。首先放置所述压裂管柱6至所述卸压孔眼1底部的射孔位置，通过所述供液导管7a手动加压至两个所述液压封隔器7膨胀并分别座封到所述射孔位置前方和后方的所述膨胀管柱21内壁，然后通过高压泵向所述压裂管柱6中注入压裂液，使得顶板c沿着射孔位置扩展形成裂缝8，完成一个层段压裂。再卸压使所述液压封隔器7收缩，回拖所述压裂管柱6至下一个射孔位置，重复压裂过程，完成整个所述卸压孔眼1的分段压裂。顶板c被压裂后的结构如图8所示。Step five, fracturing. As shown in Figure 7, the coiled tubing 3 is used to place the fracturing string 6 into the expansion string 21, and the two ends of the fracturing string 6 are respectively provided with hydraulic packers 7, and the two hydraulic pressure The packer 7 is connected with the same liquid supply conduit 7a, and the liquid supply conduit 7a is arranged along the coiled tubing 3 . First place the fracturing string 6 to the perforation position at the bottom of the pressure relief hole 1, pressurize manually through the liquid supply conduit 7a until the two hydraulic packers 7 are inflated and respectively set to the Expand the inner wall of the pipe string 21 in front of and behind the perforation position, and then inject fracturing fluid into the fracturing pipe string 6 through a high-pressure pump, so that the top plate c expands along the perforation position to form a fracture 8, completing a section fracture. The hydraulic packer 7 shrinks after pressure relief, drags the fracturing string 6 back to the next perforation position, repeats the fracturing process, and completes the staged fracturing of the entire pressure relief hole 1 . The structure of roof c after fracturing is shown in Fig. 8 .
水力射孔和压裂技术为成熟的现有技术，在一些公开文献中有详细介绍，如公开号为CN201210096577和CN109931062A的专利文件。Hydraulic perforation and fracturing technology is a mature prior art, which has been introduced in detail in some public documents, such as patent documents with publication numbers CN201210096577 and CN109931062A.
现有技术中采用水力压裂方法对顶板卸压时，为保证卸压孔眼的安全，钻眼深度较浅，多为10～20m，卸压范围小，沿着巷道a的方向，相邻两个卸压孔眼1的间距为10～15m。然而，本发明创造性地将用于油气井套管补贴的膨胀管技术用于卸压孔眼的支护，卸压孔眼1的设计深度一般大于20m，甚至在300～400m以上，进行支护后，可以有条不紊地进行后续的射孔和压裂施工，极大地保证了射孔压裂作业的顺利进行，一次钻孔和压裂可大范围地对顶板卸压。因此，沿着巷道a的方向，相邻两个卸压孔眼1的间距可适当增大，在20m以上。In the prior art, when hydraulic fracturing is used to relieve pressure on the roof, in order to ensure the safety of the pressure relief holes, the drilling depth is relatively shallow, mostly 10-20m, and the pressure relief range is small. Along the direction of the roadway a, two adjacent The distance between each pressure relief hole 1 is 10-15m. However, the present invention creatively uses the expansion tube technology used for oil and gas well casing subsidy for the support of the pressure relief hole. The design depth of the pressure relief hole 1 is generally greater than 20m, or even more than 300-400m. After the support, Subsequent perforation and fracturing operations can be carried out in an orderly manner, which greatly ensures the smooth progress of perforation and fracturing operations. One drilling and fracturing can relieve pressure on a large area of the roof. Therefore, along the direction of the roadway a, the distance between two adjacent pressure relief holes 1 can be appropriately increased to be more than 20m.
最后需要说明的是，上述描述仅仅为本发明的优选实施例，本领域的普通技术人员在本发明的启示下，在不违背本发明宗旨及权利要求的前提下，可以做出多种类似的表示，这样的变换均落入本发明的保护范围之内。Finally, it should be noted that the above description is only a preferred embodiment of the present invention, and those of ordinary skill in the art can make a variety of similar implementations under the inspiration of the present invention without violating the purpose and claims of the present invention. It means that such transformations all fall within the protection scope of the present invention.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910809164.1ACN110410053B (en) | 2019-08-29 | 2019-08-29 | Coal mine roof pressure relief method based on eyelet supporting |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910809164.1ACN110410053B (en) | 2019-08-29 | 2019-08-29 | Coal mine roof pressure relief method based on eyelet supporting |
| Publication Number | Publication Date |
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| CN110410053Atrue CN110410053A (en) | 2019-11-05 |
| CN110410053B CN110410053B (en) | 2022-03-01 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910809164.1AActiveCN110410053B (en) | 2019-08-29 | 2019-08-29 | Coal mine roof pressure relief method based on eyelet supporting |
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| CN (1) | CN110410053B (en) |
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