CN111396028B - 基于液态co2致裂增透和相变驱置瓦斯抽采达标等效量化评估方法 - Google Patents
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Abstract
本发明提供了一种基于CO2液态致裂增透和相变驱置瓦斯抽采达标等效量化评估方法;该方法结合《煤层抽采达标暂行规定》定量表征了工程试验等效达标半径、驱替置换比和瓦斯驱置效率;此外,此评估方法将液态CO2压注量与等效达标半径、驱替置换比和瓦斯驱置效率有机联合在一起,实现压注液态CO2后的量化评估(压注多少量,等效达标半径可达到多少,驱替置换比可达到多少,瓦斯驱置效率可达到多少),不仅可以为工程试验液态CO2压注量和抽采钻孔间距设计提供依据,而且可以提高瓦斯抽采和减少矿井瓦斯灾害。
Description
技术领域
本发明涉及煤层瓦斯抽采技术领域,特别涉及一种基于液态CO2致裂增透和相变驱置瓦斯抽采达标等效量化评估方法。
背景技术
瓦斯对大气环境也有较大危害,其对臭氧层的破坏及产生的温室效应分别是CO2的7倍和21倍。此外,瓦斯又是一种清洁、高效、的能源。然而,我国煤层渗透率低、瓦斯压力高、含量大,原始煤层瓦斯抽采困难。国内外学者研发了多种煤层增透及瓦斯促抽技术,主要有保护层开采、水力压裂、水力割缝、预裂爆破、冲击波致裂、液态CO2爆破等孔裂隙重构技术,以及注热、微波、声场、置换解吸等瓦斯强化解吸技。其中,CO2压入煤层具有致裂增渗和驱替置换的双重瓦斯强化抽采作用,近年来液态CO2压裂及驱替煤层瓦斯成为非常规天然气领域的研究热点之一。
目前,国内外进行了许多液态CO2压裂及驱替煤层瓦斯先导性现场试验,仅从瓦斯抽采产量上粗略获得一定效果,从未量化表征煤层达标效果。当前,常规抽采条件下,高瓦斯、煤与瓦斯突出矿井在贯彻《防治煤与瓦斯突出规定》、《煤矿瓦斯抽采达标暂行规定》,而对于液态CO2压裂及驱替煤层瓦斯试验区抽采达标效果等效量化评估,缺乏相应的方法及规范。因此,研究了一种基于液态CO2致裂增透和相变驱置瓦斯抽采达标等效量化评估方法。
发明内容
本发明所要解决的技术问题在于针对上述现有技术的不足,本发明提供了一种基于液态CO2致裂增透和相变驱置瓦斯抽采达标等效量化评估方法。
为了解决上述技术问题,本发明提供的技术方案为:基于液态CO2致裂增透和相变驱置瓦斯抽采达标等效量化评估方法,包括以下步骤:
步骤一、考察试验区域煤层CH4和CO2平均含量值,分别记为WCH4和WCO2;
步骤二、在钻孔施工过程中,收集压注孔和抽采孔煤样,在实验室进行吸附解吸实验和工业分析,获得吸附常数a,b值和煤的灰分Ad和煤的水分Mad,按《煤矿瓦斯抽采达标暂行规定》确定不可解吸瓦斯量Wb;
步骤三、统计试验压注液态CO2体积V1,根据储存液态CO2温度、压力特点,计算气化后的体积Vq;
步骤四、统计并计算时间(t)内总得抽采孔CH4和CO2抽采量,包括:抽采孔每天抽采孔瓦斯平均混合流量Qih;每天抽采钻孔CH4浓度CiCH4;每天抽采钻孔CO2浓度CiCO2;每天抽采钻孔CH4量ViCH4;每天抽采钻孔CO2量ViCO2;时间t内总得抽采孔CH4和CO2抽采量,分别记为VCH4和VCO2。
步骤五、在可解吸瓦斯含量基础上,提出适用于液态CO2致裂增透和相变驱置瓦斯抽采达标等效半径评估方法,首先基于液态CO2致裂增透和相变驱置推导煤层剩余可解吸瓦斯含量;其次,以穿层孔为例,假设以压注孔为圆心,达标等效半径为Ri,计算达标区域煤体体积Vc;最后,依据矿井工作面日常量,并通过《煤矿瓦斯抽采达标暂行规定》获得相应产量条件下可解吸瓦斯量应达到的指标,联立式(6)、(7)可获得达标等效半径计算公式(8)。
步骤六、煤体在达标范围内,进而对驱替置换比η和瓦斯驱置效率μ评估,在第五步的基础上,可获得相应驱替置换比和瓦斯驱置效率。
进一步地,所述步骤二具体为计算不可解吸瓦斯量Wb,
式中,Wb为煤在标准大气压力下的不可解吸瓦斯量,m3·t-1;a为煤的瓦斯吸附常数,试验温度下煤的极限吸附量,cm3·g-1;b为煤的瓦斯吸附常数,MPa-1;Ad为灰分;Mad为煤的水分;π为孔隙率,m3·m-3;γ为煤的容重,N·m-3。
进一步地,所述步骤三具体为计算进入压注孔CO2体积,
进一步地,所述步骤四具体为第一步计算每天抽采钻孔CH4量,
第二步计算每天抽采钻孔CO2量,
第三步计算时间t内总得抽采孔CH4和CO2抽采量,分别记为VCH4和VCO2,
进一步地,所述步骤五具体为第一步基于液态CO2致裂增透和相变驱置推导煤层剩余可解吸瓦斯含量,
式中,Vf为抽采时间t内试验区风排瓦斯量;
第二步计算达标区域煤体体积,
式中,HC为煤层厚度;L为钻孔套管出口与孔底的距离;
第三步计算达标等效半径,
进一步地,所述步骤六具体为第一步计算达标区域驱替置换比η,
第二步计算达标区域瓦斯置换效率μ,
本发明与现有技术相比有以下优点:
该方法结合《煤层抽采达标暂行规定》定量表征了工程试验等效达标半径、驱替置换比和瓦斯驱置效率;此外,此评估方法将液态CO2压注量与等效达标半径、驱替置换比和瓦斯驱置效率有机联合在一起,实现压注液态CO2后的量化评估(压注多少量,等效达标半径可达到多少,驱替置换比可达到多少,瓦斯驱置效率可达到多少),不仅可以为工程试验液态CO2压注量和抽采钻孔间距设计提供依据,而且可以提高瓦斯抽采和减少矿井瓦斯灾害。
附图说明
下面结合附图和实施例对本发明进一步说明。
图1是基于液态CO2致裂增透和相变驱置瓦斯抽采达标等效量化评估方法的流程示意图。
图2是穿层钻孔布置示意图。
图3是顺层钻孔布置示意图。
具体实施方式
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的一部分实施例,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作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。
实施例1:
如图1、图2、图3所示,一种基于液态CO2致裂增透和相变驱置瓦斯抽采达标等效量化评估方法,包括以下步骤:
第一步考察试验区域煤层CH4和CO2平均含量值,分别记为WCH4和WCO2;
第二步在钻孔施工过程中,收集压注孔和抽采孔煤样,在实验室进行吸附解吸实验和工业分析,获得吸附常数a,b值和煤的灰分Ad和煤的水分Mad,按《煤矿瓦斯抽采达标暂行规定》确定不可解吸瓦斯量Wb;
在实际使用当中,通过公式式中,Wb为煤在标准大气压力下的不可解吸瓦斯量,m3·t-1;a为煤的瓦斯吸附常数,试验温度下煤的极限吸附量,cm3·g-1;b为煤的瓦斯吸附常数,MPa-1;Ad为灰分,%;Mad为煤的水分,%;π为孔隙率,m3·m-3;γ为煤的容重,N·m-3,来计算相应的数值。
实施例2:
基于实施例1的基础上,
需要说明,本发明实施例中所有方向性指示(诸如上、下、左、右、前、后……)仅用于解释在某一特定姿态(如附图所示)下各部件之间的相对位置关系、运动情况等,如果该特定姿态发生改变时,则该方向性指示也相应地随之改变。
另外,在本发明中涉及“第一”、“第二”等的描述仅用于描述目的,而不能理解为指示或暗示其相对重要性或者隐含指明所指示的技术特征的数量。由此,限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。
各个实施例之间的技术方案可以相互结合,但是必须是以本领域普通技术人员能够实现为基础,当技术方案的结合出现相互矛盾或无法实现时应当认为这种技术方案的结合不存在,也不在本发明要求的保护范围之内。
Claims (1)
1.基于液态CO2致裂增透和相变驱置瓦斯抽采达标等效量化评估方法,其特征在于,包括以下步骤:
步骤一、考察试验区域煤层CO2和CH4平均含量值,分别记为WCH4和WCO2;
步骤二、在钻孔施工过程中,收集压注孔和抽采孔煤样,在实验室进行吸附解吸实验和工业分析,获得吸附常数a,b值和煤的灰分Ad和煤的水分Mad,按《煤矿瓦斯抽采达标暂行规定》确定不可解吸瓦斯量Wb;
步骤三、统计试验压注液态CO2体积V1,根据储存液态CO2温度、压力特点,计算气化后的体积Vq;
步骤四、统计并计算时间(t)内总得抽采孔CH4和CO2抽采量,包括:抽采孔每天抽采孔瓦斯平均混合流量Qih;每天抽采钻孔CH4浓度CiCH4;每天抽采钻孔CO2浓度CiCO2;每天抽采钻孔CH4量ViCH4;每天抽采钻CO2孔量ViCO2;时间t内总得抽采孔CH4和CO2抽采量,分别记为VCH4和VCO2;
步骤五、在可解吸瓦斯含量基础上,提出适用于液态CO2致裂增透和相变驱置瓦斯抽采达标等效半径评估方法,首先基于液态CO2致裂增透和相变驱置推导煤层剩余可解吸瓦斯含量;其次,以穿层孔为例,假设以压注孔为圆心,达标等效半径为Ri,计算达标区域煤体体积Vc;最后,依据矿井工作面日常量,并通过《煤矿瓦斯抽采达标暂行规定》获得相应产量条件下可解吸瓦斯量应达到的指标,联立式(6)、(7)可获得达标等效半径计算公式(8);
步骤六、煤体在达标范围内,进而对驱替置换比η和瓦斯驱置效率μ评估,在第五步的基础上,可获得相应驱替置换比和瓦斯驱置效率;
所述步骤二具体为计算不可解吸瓦斯量Wb,
式中,Wb为煤在标准大气压力下的不可解吸瓦斯量,m3·t-1;a为煤的瓦斯吸附常数,试验温度下煤的极限吸附量,cm3·g-1;b为煤的瓦斯吸附常数,MPa-1;
Ad为灰分;Mad为煤的水分;π为孔隙率,m3·m-3;γ为煤的容重,N·m-3;
所述步骤三具体为计算进入压注孔CO2体积,
所述步骤四具体为第一步计算每天抽采钻孔CH4量,
第二步计算每天抽采钻孔CO2量,
第三步计算时间t内总得抽采孔CH4和CO2抽采量,分别记为VCH4和VCO2,
所述步骤五具体为第一步基于液态CO2致裂增透和相变驱置推导煤层剩余可解吸瓦斯含量,
式中,Vf为抽采时间t内试验区风排瓦斯量;
第二步计算达标区域煤体体积,
式中,HC为煤层厚度;L为钻孔套管出口与孔底的距离;
第三步计算达标等效半径,
所述步骤六具体为第一步计算达标区域驱替置换比η,
第二步计算达标区域瓦斯置换效率μ,
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