路小茜,王伟,郑永香,尹超,李亚东,周星宇
LU Xiao-xi,WANG Wei,ZHENG Yong-xiang,YIN Chao,LI Ya-dong,ZHOU Xing-yu

• 1:石家庄铁道大学道路与铁道工程安全保障省部共建教育部重点实验室
• 2:石家庄铁道大学河北省金属矿山安全高效开采技术创新中心

摘要(Abstract)：

为了分析爆破后裂隙内气体的返排规律，基于气液两相流规律，借助相场方法对两相流界面进行追踪，模拟了驱替压差、裂隙开度和接触角等对裂隙内气体返排过程中水气界面形态和位置的时空演化规律；通过响应面法，分析了各影响因素的显著性，最终建立了气体返排效果评价流程。研究表明，单因素分析裂隙内气体返排效率同驱替压差、裂隙开度成正比。通过多因素分析，以气体排出速率作为评价指标，建立了CO_2气体返排效果评价流程。该研究内容对低渗砂岩型铀矿的爆破增渗后气体返排工艺具有一定的理论参考和现场指导意义。
In order to analyze the law of gas backflow in the fracture after blasting, based on the law of water-gas two-phase flow, the phase field method was used to track the interface of the two-phase flow, and the space-time evolution law of the shape and position of the water-gas interface in the process of gas backflow in the fracture was simulated, including pressure difference, opening degree and contact angle. The significance of each influencing factor was analyzed by response surface method, and finally the evaluation process of gas backflow was established. The results show that the gas flowback efficiency is directly proportional to the pressure difference and the opening degree. Through multi-factor analysis, the evaluation process of CO_2 gas backflow effect was established by taking the time required for complete gas discharge as the evaluation index. The research content has certain theoretical reference and field guidance significance for gas flowback process of low permeability sandstone uranium mine after blasting and increasing permeability.

关键词(KeyWords)： 爆破增渗;气体返排;两相流;界面追踪;低渗砂岩型铀矿;地浸开采
permeability enhancement by blasting;gas backflow;two phase flow;interface tracking;low permeability sandstone-type uranium deposit;In-situ leaching mining

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(51979170,U1967208);; 河北省自然科学基金资助项目(E2021210128,E2021210036);; 石家庄铁道大学研究生创新基金资助项目(YC2022011)

作者(Author): 路小茜,王伟,郑永香,尹超,李亚东,周星宇
LU Xiao-xi,WANG Wei,ZHENG Yong-xiang,YIN Chao,LI Ya-dong,ZHOU Xing-yu

DOI: 10.19931/j.eb.20220068

参考文献(References)：

• [1] 王伟，李小春.低渗透砂岩型铀矿床增渗方法及其可行性研究[J].岩土力学，2009,30(8):2 309-2 314.WANG W,LI X C.Study of enhanced permeability methods and their feasibility in low-permeability sandstone-type uranium deposit[J].Rock and soil mechanics,2009,30(8):2 309-2 314.
• [2] 王伟，李小春，袁维，等.低渗透砂岩型铀矿床爆破增渗模型试验及增渗机制研究[J].岩石力学与工程学报，2016,35(8):1 609-1 617.WANG W,LI X C,YUAN W,et al.Model test and mechanism study of the blasting-enhanced permeability of sandstone-type uranium deposits of low-permeability[J].Chinese Journal of Rock Mechanics and Enginecring,2016,35(8):1 609-1 617.
• [3] 白鑫，骆桂君，王艳，等.低渗砂岩型铀矿液态CO2相变致裂增透高效开采新模式[J].金属矿山，2021(7):50-57.BAI X,LUO G J,WANG Y,et al.Optimization of fracture location for staged fracturing of horizontal wells in low permeability sandstone gas reservoirs[J].Journal of Metal Mine,2021(7):50-57.
• [4] 夏军，陶良云，李必红，等.二氧化碳液-气相变膨胀破岩技术及应用[J].工程爆破，2018,24(3):50-54.XIA J,TAO L Y,LI B H,et al.Technology and application of the rock breaking by CO2 liquid-gas phase transition and expansion[J].Engineering blasting,2018,24(3):50-54.
• [5] 屈亚光，巩旭，石康立，等.页岩储层压裂液渗吸及返排机理研究进展[J].当代化工，2020,49(11):2 532-2 535.QU Y G,GONG X,SHI K L,et al.Research progress on imbibition and flowback mechanism of fluids in shale reservoirs[J].Contemporary Chemical Industry,2020,49(11):2 532-2 535.
• [6] 夏开文，周传波.岩石动态力学参数测试综述[J].工程爆破，2014,20(2):43-53.XIA K W,ZHOU C B.Review of testing methods for dynamic rock mechanical properties [J].Engineering Blasting,2014,20(2):43-53.
• [7] 陈刚，徐世光，刘春学，等.岩体单裂隙渗流研究进展[J].人民黄河，2019,41(S2):64-66,77.CHEN G,XU S G,LIU C X,et al.Research progress of rock mass seepage in single fracture[J].Yellow River,2019,41(S2):64-66,77.
• [8] 王媛，速宝玉.单裂隙面渗流特性及等效水力隙宽[J].水科学进展，2002,13(1):61-68.WANG Y,SU B Y.Seepage characteristics and equivalent hydraulic gap width of single fracture surface[J].Advances in Water Science,2002,13(1):61-68.
• [9] 刘晓强，孙海，吕爱民，等.考虑压裂液返排的致密气藏气水两相产能分析[J].东北石油大学学报，2020,44(2):103-112.LIU X Q,SUN H,LV A M,et al.Gas-water two-phase productivity analysis of tight gas reservoir considering fracturing fluid flowback[J].Journal of Northeast Petroleum University,2020,44(2):103-112,.
• [10] 姜广辉.裂隙气液两相渗流特性试验研究[D].徐州：中国矿业大学，2014.JIANG G H.Experimental research on gas-water two phase flow characteristics in rock fractures[D].Xuzhou:China University of Mining and Technology,2014.
• [11] 屈圣力，刘国强，刘苏奇.大宁-吉县地区致密砂岩气井压后返排分析[J].中国石油和化工标准与质量，2019,39(10):92-93,96.QU S L,LIU G Q,LIU S Q.Post-pressure flowback analysis of tight sandstone gas wells in Daning-Jixian area[J].China Petroleum and Chemical Standard and Quality,2019,39(10):92-93,96.
• [12] SCESI L,GATTINONI P.Roughness control on hydraulic conductivity in fractured rocks[J].Hydrogeology Journal,2007,15:201-211.
• [13] 田俊林.煤储层渗透率影响因素及排采控制研究[J].内蒙古石油化工，2020,46(1):17-19.TIAN J L.Study on influencing factors of coal reservoir permeability and control of drainage and production [J].Inner Mongolia Petrochemical Industry,2020,46(1):17-19.
• [14] 蒋兰兰.CO2地质封存多孔介质内气液两相渗流特性研究[D].大连理工大学，2014.JIANG L L.Study on gas-liquid two-phase seepage characteristics in porous media of CO2 geological storage [D].Dalian University of Technology,2014.
• [15] 盛建龙，韩云飞，叶祖洋，等.粗糙裂隙水、气两相流相对渗透系数模型与数值分析[J].岩土力学，2020,41(3):1 048-1 055.SHENG J L,HAN Y F,YE Z Y,et al.Relative permeability model for water-air two-phase flow in rough-walled fractures and numerical analysis[J].Rock and Soil Mechanics,2020,41(3):1 048-1 055.
• [16] 张春梅.水气两相流在单裂隙岩体中运移规律的数值模拟研究[D].阜新：辽宁工程技术大学，2011.ZHANG C M.Numerical simulation of water-gas two-phase flow migration in single fractured rock mass [D].Fuxin:Liaoning Technical University,2011.
• [17] PENG J,SONG R,WANG Y,et al.Comparative study of VOF,LS,and VOSET on pore-scale immiscible water-flooding modeling[J].Petroleum,2021,7(3):314-324.
• [18] 刘博伟，牟松茹，李彦来，等.基于格子玻尔兹曼方法的岩心切片渗流通道研究[J].石油化工高等学校学报，2020,33(6):43-48.LIU B W,MOU S R,LI Y L,et al.Study on seepage channel of core section based on lattice boltzmann method[J].Journal of Petrochemical Universities,2020,33(6):43-48.
• [19] 杜艳珍，舒晓，张甲.基于格子玻尔兹曼方法的多孔介质渗流模拟[J].石油化工应用，2014,33(4):17-20.DU Y Z,SHU X,ZHANG J.Flow simulation in porous media based on lattice-Boltzmann method[J].Petrochemical Application,2014,33(4):17-20.
• [20] 杜殿发，赵艳武，张婧，等.页岩气渗流机理研究进展及发展趋势[J].西南石油大学学报(自然科学版),2017,39(4):136-144.DU D F,ZHAO Y W,ZHANG J,et al.Progress and trends in shale gas seepage mechanism research [J].Journal of Southwest Petroleum University (science & technology edition),2017,39(4):136-144.
• [21] 刘洋，李飞，柴小庆，等.渗流的PFC-CFD耦合细观数值模拟[J].水文地质工程地质，2008,35(2):66-70.LIU Y,LI F,CHAI X Q,et al.A PFC-CFD coupled model in meso-scale for seepage[J].Hydrogeology and Engineer-ing Geology,2008,35(2):66-70.
• [22] 李治豪，陈世江，冯宇迪，等.不同水压加载下煤体裂隙渗流数值模拟[J].科学技术与工程，2021,21(6):2 255-2 261.LI Z H,CHEN S J,FENG Y D,et al.Numerical simulation of coal fracture seepage under Different Pressure Loading [J].Science Technology and Engineering,2021,21(6):2 255-2 261.
• [23] 郭健，杨治国，康逢学.基于向量投影响应面法的隧道围岩变形稳定可靠度分析[J].现代隧道技术，2019,56(6):70-77.GUO J,YANG Z G,KANG F X.Reliability analysis of surrounding rock deformation stability based on vector projection response surface method[J].Modern Tunnel Technology,2019,56(6):70-77.