CN111472832A - Coal bed gas self-circulation gas injection yield increasing method - Google Patents
Coal bed gas self-circulation gas injection yield increasing methodDownload PDFInfo
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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
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- 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
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- E21B43/168—Injecting a gaseous medium
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Abstract
Description
Translated fromChinese技术领域technical field
本发明涉及煤层瓦斯抽采领域，具体涉及一种煤层瓦斯自循环注气增产方法。The invention relates to the field of coal seam gas drainage, in particular to a method for increasing production by self-circulating gas injection of coal seam gas.
背景技术Background technique
随着浅部煤炭资源的逐渐枯竭，未来煤炭资源开采将逐渐进入深部。而深部煤层具有含气量高、压力大等特点，严重威胁煤矿的安全开采和生成。由于煤层瓦斯不仅是一种清洁能源而且也是一种强温室气体。据统计，我国埋深在1000～2000m之间的煤层瓦斯资源量占全国煤层瓦斯资源总量的61.2％，具有极高的开采价值。因此，实现煤层瓦斯的高效开采对于提高煤矿安全开采，实现资源化利用和环境保护均具有重要意义。With the gradual exhaustion of shallow coal resources, coal resource mining will gradually enter the deep in the future. The deep coal seam has the characteristics of high gas content and high pressure, which seriously threatens the safe mining and formation of coal mines. Because coal seam gas is not only a clean energy but also a strong greenhouse gas. According to statistics, the coal seam gas resources buried in the depth of 1000-2000m in my country account for 61.2% of the total coal seam gas resources in China, and have extremely high mining value. Therefore, realizing the efficient mining of coal seam gas is of great significance for improving the safe mining of coal mines, realizing resource utilization and environmental protection.
而我国目前大部分的煤层瓦斯抽采方式主要包括：(1)通过抽采泵直接连入抽采系统进行抽采；(2)首先通过水力压裂、水力割缝以及松动爆破等措施对煤层进行致裂增透，然后在连入抽采系统进行抽采；(3)通过高压泵注入氮气和二氧化碳等气体对煤层瓦斯进行驱替抽采。但是以上措施均存在一些包括成本较高，抽采效率较低以及施工风险较大等缺点。因此，为了提高煤层瓦斯的高效抽采效果和抽采浓度，急需寻求全新的抽采模式及方法，以满足煤矿井下瓦斯高效抽采的要求。Most of the current coal seam gas extraction methods in my country mainly include: (1) Draining through the extraction pump directly connected to the extraction system; (2) First, the coal seam is drained by hydraulic fracturing, hydraulic slitting and loosening blasting. Fracture and increase permeability, and then connect to the extraction system for extraction; (3) The coal seam gas is displaced and extracted by injecting nitrogen, carbon dioxide and other gases through a high-pressure pump. However, the above measures all have some disadvantages including high cost, low extraction efficiency and high construction risk. Therefore, in order to improve the efficient drainage effect and drainage concentration of coal seam gas, it is urgent to seek a new drainage mode and method to meet the requirements of efficient underground gas drainage in coal mines.
发明内容SUMMARY OF THE INVENTION
针对上述存在的技术不足，本发明的目的是提供一种煤层瓦斯自循环注气增产方法，其操作简单、成本低、安全性高、抽采效果较好。In view of the above-mentioned technical deficiencies, the purpose of the present invention is to provide a method for increasing production by self-circulating gas injection of coal seam gas, which is simple in operation, low in cost, high in safety and good in extraction effect.
为解决上述技术问题，本发明采用如下技术方案：In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions:
本发明提供一种煤层瓦斯自循环注气增产方法，具体包括以下步骤：The invention provides a method for increasing production by self-circulating gas injection of coal seam gas, which specifically includes the following steps:
S1：首先从巷道钻场向煤层中分别施工两个瓦斯抽采钻孔和一个注气钻孔，然后再将瓦斯抽采管一、瓦斯抽采管二和注气管分别放入瓦斯抽采钻孔和注气钻孔后并封孔；S1: First, construct two gas drainage holes and one gas injection hole into the coal seam from the roadway drilling site, and then put the first gas drainage pipe, the second gas drainage pipe and the gas injection pipe into the gas drainage drill. Hole and gas injection after drilling and sealing;
S2：将瓦斯抽采管一和瓦斯抽采管二通过管路与瓦斯抽采泵吸气口相连接，注气管通过管路与气体增压泵出气口相连接；S2: Connect the gas extraction pipe 1 and the
S3：瓦斯抽采泵出气口分两路，一路连接瓦斯抽采系统，另一路连接过滤装置，瓦斯抽采系统、过滤装置与瓦斯抽采泵之间的管路上分别设置阀门四和阀门一，过滤装置出气口通过管路依次连接储气罐、气体混配室和气体增压泵，储气罐、气体增压泵与气体混配室之间的管路分别设置阀门二和阀门三；S3: The gas outlet of the gas extraction pump is divided into two channels, one is connected to the gas extraction system, and the other is connected to the filter device. Valve four and valve one are respectively set on the pipeline between the gas extraction system, the filter device and the gas extraction pump. The air outlet of the filter device is connected to the air storage tank, the gas mixing chamber and the gas booster pump in sequence through pipelines, and the pipelines between the gas storage tank, the gas booster pump and the gas mixing chamber are respectively provided with
S4：关闭阀门四，打开瓦斯抽采泵和阀门一，开始进行煤层的瓦斯抽采，抽采的瓦斯先经过过滤装置过滤掉抽采过程产生的废渣和废水，然后进入到储气罐，之后打开阀门二并控制阀门二的开度使瓦斯气体按照一定流量进入到气体混配室内；S4:
S5：在气体混配室内首先通过其自带的气体浓度检测功能检测流入的瓦斯浓度，若瓦斯浓度处于瓦斯爆炸界限内，则通过注入干空气混配将瓦斯浓度降低到爆炸界限以下；然后打开阀门三和气体增压泵，混配后的瓦斯气体通过气体增压泵增压到设定的临界值后，通过注气管注入到煤层中进行驱替作业；S5: In the gas mixing chamber, first detect the inflowing gas concentration through its own gas concentration detection function. If the gas concentration is within the gas explosion limit, the gas concentration is reduced to below the explosion limit by injecting dry air; then open the Valve Sanhe gas booster pump. After the mixed gas is boosted to the set critical value by the gas booster pump, it is injected into the coal seam through the gas injection pipe for displacement operation;
S6：待驱替一定时间后，关闭阀门一、阀门二、阀门三和气体增压泵；S6: After a certain time of displacement, close valve 1,
S7：打开阀门四，将瓦斯抽采管一和瓦斯抽采管二通过瓦斯抽采泵连入瓦斯抽采系统进行抽采作业；S7: Open the fourth valve, and connect the gas extraction pipe 1 and the
S8：待瓦斯抽采系统中的瓦斯浓度降低到设定临界值以下时，重复步骤S4～S7，直至抽采作业结束。S8: When the gas concentration in the gas extraction system falls below the set critical value, repeat steps S4 to S7 until the extraction operation ends.
优选地，步骤S1中，注气钻孔位于两个瓦斯抽采钻孔之间的中部位置。Preferably, in step S1, the gas injection hole is located in the middle position between the two gas drainage holes.
优选地，步骤S8中，设定瓦斯抽采系统中的瓦斯浓度临界值为20％。Preferably, in step S8, the critical value of gas concentration in the gas extraction system is set to 20%.
优选地，步骤S5中，设定混配后的瓦斯气体通过气体增压泵增压的临界值为10Mpa。Preferably, in step S5, the critical value of the mixed gas gas being boosted by the gas booster pump is set to be 10Mpa.
优选地，步骤S6中设定驱替时间为小时。Preferably, the displacement time is set to hours in step S6.
本发明的有益效果在于：本发明通过煤层瓦斯的自循环系统，形成了煤层瓦斯的自驱替方法，避免了外部气体大量混入煤层，节约了驱替成本，降低了驱替风险；同时利用抽采的瓦斯循环驱替煤层瓦斯提高了瓦斯的驱替效果，结合并联的瓦斯抽采系统形成交变的强化瓦斯抽采方法，该方法操作简单、成本低、安全性高、抽采效果好、适用范围较广。The beneficial effects of the present invention are as follows: the present invention forms a self-displacement method for coal seam gas through the self-circulation system of coal seam gas, which avoids a large amount of external gas being mixed into the coal seam, saves the cost of displacement, and reduces the risk of displacement; The mined gas circulates to displace the coal seam gas, which improves the gas displacement effect. Combined with the parallel gas extraction system, an alternate enhanced gas extraction method is formed. The method is simple in operation, low in cost, high in safety, good in extraction effect and Wide range of applications.
附图说明Description of drawings
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.
图1为本发明实施例提供的一种煤层瓦斯自循环注气增产方法中各部件的连接系统图。FIG. 1 is a connection system diagram of each component in a coalbed gas self-circulating gas injection method for increasing production provided by an embodiment of the present invention.
附图说明：1-钻场，2-注气管，3-瓦斯抽采管一，4-瓦斯抽采管二，5-煤层，6-瓦斯抽采泵，7-阀门一，8-过滤装置，9-储气罐，10-阀门二，11-气体混配室，12-阀门三，13-气体增压泵，14-阀门四，15-瓦斯抽采系统。Description of drawings: 1-Drilling site, 2-Gas injection pipe, 3-Gas extraction pipe 1, 4-
具体实施方式Detailed ways
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
如图1所示，一种煤层瓦斯自循环注气增产方法，具体包括以下步骤：As shown in Figure 1, a method for increasing production by self-circulating gas injection in coalbed gas specifically includes the following steps:
S1：首先从巷道钻场1向煤层5中分别施工两个瓦斯抽采钻孔和一个注气钻孔，注气钻孔位于两个瓦斯抽采钻孔之间的中部位置，然后再将瓦斯抽采管一3、瓦斯抽采管二4和注气管2分别放入瓦斯抽采钻孔和注气钻孔后并封孔；S1: First, construct two gas drainage holes and one gas injection hole respectively from roadway drilling field 1 to
S2：将瓦斯抽采管一3和瓦斯抽采管二4通过管路与瓦斯抽采泵6吸气口相连接，注气管2通过管路与气体增压泵13出气口相连接；S2: Connect the gas extraction pipe 1 3 and the
S3：瓦斯抽采泵(6)出气口分两路，一路连接瓦斯抽采系统15，另一路连接过滤装置8，瓦斯抽采系统15、过滤装置8与瓦斯抽采泵6之间的管路上分别设置阀门四14和阀门一7，过滤装置8出气口通过管路依次连接储气罐9、气体混配室11和气体增压泵13，储气罐9、气体增压泵13与气体混配室11之间的管路分别设置阀门二10和阀门三12；S3: The gas outlet of the gas extraction pump (6) is divided into two channels, one is connected to the
S4：关闭阀门四14，打开瓦斯抽采泵6和阀门一7，开始进行煤层5的瓦斯抽采，抽采的瓦斯先经过过滤装置8过滤掉抽采过程产生的废渣和废水，然后进入到储气罐9，之后打开阀门二10并控制阀门二10的开度使瓦斯气体按照一定流量进入到气体混配室11内；S4: Close the valve four 14, open the gas extraction pump 6 and valve one 7, and start the gas extraction of the
S5：在气体混配室11内首先通过其自带的气体浓度检测功能检测流入的瓦斯浓度，若瓦斯浓度处于瓦斯爆炸界限内，则通过注入干空气混配将瓦斯浓度降低到爆炸界限以下；然后打开阀门三12和气体增压泵13，混配后的瓦斯气体通过气体增压泵13增压到10Mpa后，通过注气管2注入到煤层5中进行驱替作业；S5: In the
S6：待驱替24小时后，关闭阀门一7、阀门二10、阀门三12和气体增压泵13；S6: After 24 hours of displacement, close valve one 7, valve two 10, valve three 12 and
S7：打开阀门四14，将瓦斯抽采管一3和瓦斯抽采管二4通过瓦斯抽采泵6连入瓦斯抽采系统15进行抽采作业；S7: Open the valve four 14, and connect the gas extraction pipe 1 3 and the
S8：待瓦斯抽采系统15中的瓦斯浓度降低到20％以下时，重复步骤S4～S7，直至抽采作业结束。S8: When the gas concentration in the
显然，本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Thus, provided that these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.
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