煤层多分支水平井叶脉仿生瓦斯抽采实验研究  

Experimental study on leaf vein bionic gas drainage of multi-branch horizontal wells in coal seams

作　　者：郭晓阳[1] 邓存宝[1,2] 凡永鹏 范楠 穆永亮 GUO Xiaoyang;DENG Cunbao;FAN Yongpeng;FANNan;MU Yongliang(College of Safety Science and Engineering,L iaoning Technical University,Fuxin,L iaoning 123000,China;College of Safety and Emergency Management Engineerings Taiyuan University of Technology Taiyuan,Shanxi 030024,China;College of Mining Engineerings Liaoning Technical University Fuxin,Liaoning 123000,China)

机构地区：[1]辽宁工程技术大学安全科学与工程学院,辽宁阜新123000 [2]太原理工兴学安全与应急管理工程学院,山西太原030024 [3]辽宁工程技术大学矿业学院,辽宁阜新123000

出　　处：《岩石力学与工程学报》2019年第12期2418-2427,共10页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家科技重大专项资助项目(2016ZX05067005–003);国家自然科学基金资助项目(51604144)~~

摘　　要：为了提高低渗煤层气采收率,提出多分支水平井叶脉仿生瓦斯抽采技术理念。通过叶片标本扫描和结构测量对4种典型的叶脉结构进行数据提取和分析,并用荧光标记实验研究叶脉结构内部水分运输,提取多分支水平井的叶脉仿生特征。采用自主研发的实验系统进行物理模拟实验,研究多分支水平井的叶脉仿生特征对储层瓦斯渗流–温度场时空演化规律的影响。结果显示:分支井呈非对称分布时抽采效果更好,分支井长度对抽采效果的影响最大。当分支井长度增加50%,瓦斯压力降低28.37%。分支井夹角的增加能显著增强储层瓦斯卸压效果。当间距增加50%,瓦斯压力降低6.81%。煤储层温度变化比压力变化滞后,在抽采前期,瓦斯压力和储层温度的降低与初始瓦斯压力呈正相关,但在抽采后期所受影响较小。In order to improve coalbed methane recovery in low permeability coal seams,a concept of leaf vein bionic gas drainage of multi-branch horizontal wells was proposed. Vein structure of 4 typical leaves was extracted and analyzed by leaf specimen scanning and structural measurement. The fluorescent labeling experiment was used to study water transport in vein structureand to obtain the bionic features. The physical simulation experiment was carried out by self-developed experimental system to study the influence of leaf vein bionic characteristics on flow-temperature field. The results show that the extraction effect is better with asymmetrical branches and is most affected by the length of branch wells. When the length of branch wells increases by 50%,the gas pressure decreases by 28.37% in the reservoir. Increasing the angle of branch wells can significantly enhance the gas pressure relief. When the distance between the branch wells increases by 50%,the gas pressure decreases by 6.81%. Temperature change lags behind the pressure in the reservoir. The decreases of both the gas pressure and the temperature are positively correlated with the initial gas pressure in the early stage of gas extraction but hardly affected by the initial gas pressure in the later stage.

关 键 词：采矿工程 叶脉仿生 煤层气 多分支水平井 物理模拟实验 

分 类 号：TD32[矿业工程—矿井建设]