煤层气井排采扰动下局部水动力场对排采的动态影响
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摘要
煤层气主要以吸附态存在于煤层中,其产出需要历经解吸—扩散—渗流的过程。煤层气的产出过程说明,煤岩储层压力低于煤层气的临界解吸压力是煤层气解析产出的关键。排水降压是降低煤岩储层压力最为行之有效的方法,在排水降压的过程中会对地下原始水动力场产生扰动,在井周围形成局部水动力场,从而影响排水降压的效能。该文根据地下水的流动状态、区域构造发育状态,结合煤储层与含水层的组合关系,提出了煤储层排水降压过程可能出现有效扰动型、含水层水入侵型、地表淡水入侵型等3种局部水动力场,并结合实例分析了不同种类水动力场对煤层气排采的动态影响,对指导煤层气的排采具有实际意义。
Coalbed gas is mainly adsorbed in coal strata adsorptive state.Its output must experience the process of desorption—diffusion—seepage.The production process of coalbed gas indicates that the pressure of coal and rock reservoir is lower than the critical desorption pressure of coalbed gas,which is the key to the resolution output of coalbed gas.Drainage depressurization is the most effective method to reduce the pressure of coal and rock reservoir.In the process of drainage and depressurization,the original hydrodynamic field of underground water will be disturbed and the local hydrodynamic field is formed around the well,which will affect the efficiency of drainage and depressurization.According to the flow state of groundwater,regional tectonic development state,combining with the combination of coal reservoir and aquifer,3 kinds of local hydrodynamic fields,such as effective disturbance type,aquifer water intrusion type and surface fresh water intrusion type are proposed in the process of coal reservoir drainage and depressurization,and different kinds of hydrodynamic fields have been analyzed combining with examples.The dynamic influence of CBM drainage is of practical significance for guiding CBM production.
Coalbed gas is mainly adsorbed in coal strata adsorptive state.Its output must experience the process of desorption—diffusion—seepage.The production process of coalbed gas indicates that the pressure of coal and rock reservoir is lower than the critical desorption pressure of coalbed gas,which is the key to the resolution output of coalbed gas.Drainage depressurization is the most effective method to reduce the pressure of coal and rock reservoir.In the process of drainage and depressurization,the original hydrodynamic field of underground water will be disturbed and the local hydrodynamic field is formed around the well,which will affect the efficiency of drainage and depressurization.According to the flow state of groundwater,regional tectonic development state,combining with the combination of coal reservoir and aquifer,3 kinds of local hydrodynamic fields,such as effective disturbance type,aquifer water intrusion type and surface fresh water intrusion type are proposed in the process of coal reservoir drainage and depressurization,and different kinds of hydrodynamic fields have been analyzed combining with examples.The dynamic influence of CBM drainage is of practical significance for guiding CBM production.
引文
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[12]朱蓉,楼章华,金爱民,等.鄂尔多斯盆地上古生界深盆气藏流体动力学特征及成藏过程分析[J].地质科学,2003,38(1):31-43.
[13]康永尚,吴文旷.含油气盆地流体分析方法体系及今后应加强研究的问题[J].地质评论,1999,45(2):151-157.
[14]秦胜飞,宋岩,唐修义,等.水动力条件对煤层气含量的影响——煤层气滞留水控气论[J].天然气地球科学,2005,16(2):149-152.
[15]王密计,康永尚,毛得雷,等.煤层气排采局部水动力场模式及其意义——以鄂尔多斯盆地东南缘为例[J].天然气工业,2013,33(7):57-62.
[16]冯三利,胡爱梅,叶建平,等.中国煤层气勘探开发技术研究[M].北京:石油工业出版社,2007:12-46.
[17]康永尚,秦绍锋,韩军,等.煤层气井排采动态典型指标分析方法体系[J].煤炭学报,2013,38(10):1825-1830.
[18]康永尚,窦凤珂,秦绍锋,等.煤层气井排采动态典型指标分析及其工程意义[A]//2012年煤层气学术研讨会论文集[C].成都:地质出版社,2012.
[19]康永尚,窦凤珂,张兵,等.煤层气井产量预测动态统计方法[A]//2013年煤层气学术研讨会论文集[C].杭州:地质出版社,2013.
[2]高洪烈.论地下水与煤层气[J].中国煤田地质,1998,10(4):45-48.
[3]周志成,王念喜,段春生.煤层水在煤层气勘探开发中的作用[J].天然气工业,1999,19(4):23-25.
[4]马凤山,李尚儒,蔡祖煌.煤层气开发的水文地质问题[J].水文地质工程地质,1998(3):20-22.
[5]刘洪林,李景明,王红岩,等.水动力对煤层气成藏的差异性研究[J].天然气工业,2006,26(3):35-37.
[6]夏朋,赵凯,李照阳,等.水动力条件对煤层气赋存的控制作用研究[J].硅谷,2009:105-164.
[7]金爱民,楼章华,朱蓉,等.地下水动力场的形成演化及其流体特征分析——以鄂尔多斯盆地上古生界为例[J].浙江大学学报(理学版),2003,30(3):337-343.
[8]骆祖江,杨锡禄.煤层甲烷运移聚集水动力场研究[J].长春地质学院学报,1997,27(3):356-358.
[9]楼章华,金爱民,田炜卓,等.论陆相含油气沉积盆地地下水动力场与油气运移、聚集[J].地质科学,2005,40(3):305-318.
[10]叶建平,武强,王子和.水文地质条件对煤层气赋存的控制作用[J].煤炭学报,2001,26(5):459-462.
[11]薛禹群,朱学愚.地下水动力学[M].北京:地质出版社,2007:18-107.
[12]朱蓉,楼章华,金爱民,等.鄂尔多斯盆地上古生界深盆气藏流体动力学特征及成藏过程分析[J].地质科学,2003,38(1):31-43.
[13]康永尚,吴文旷.含油气盆地流体分析方法体系及今后应加强研究的问题[J].地质评论,1999,45(2):151-157.
[14]秦胜飞,宋岩,唐修义,等.水动力条件对煤层气含量的影响——煤层气滞留水控气论[J].天然气地球科学,2005,16(2):149-152.
[15]王密计,康永尚,毛得雷,等.煤层气排采局部水动力场模式及其意义——以鄂尔多斯盆地东南缘为例[J].天然气工业,2013,33(7):57-62.
[16]冯三利,胡爱梅,叶建平,等.中国煤层气勘探开发技术研究[M].北京:石油工业出版社,2007:12-46.
[17]康永尚,秦绍锋,韩军,等.煤层气井排采动态典型指标分析方法体系[J].煤炭学报,2013,38(10):1825-1830.
[18]康永尚,窦凤珂,秦绍锋,等.煤层气井排采动态典型指标分析及其工程意义[A]//2012年煤层气学术研讨会论文集[C].成都:地质出版社,2012.
[19]康永尚,窦凤珂,张兵,等.煤层气井产量预测动态统计方法[A]//2013年煤层气学术研讨会论文集[C].杭州:地质出版社,2013.