高挥发分烟煤储层贾敏伤害特征试验研究  

Experimental study on characteristics of Jiamin damage in high-volatile bituminous coal reservoirs

作　　者：李鑫 杜世涛 杨曙光 韦波 王子强 陈艳鹏 胡振鹏 程鸣 傅雪海[5] 康俊强 LI Xin;DU Shitao;YANG Shuguang;WEI Bo;WANG Ziqiang;CHEN Yanpeng;HU Zhenpeng;CHENG Ming;FU Xuehai;KANG Junqiang(School of Geology and Mining Engineering,Xinjiang University,Urumqi 830047,China;Xinjiang Base of Huairou National Laboratory(Xinjiang Research Institute),Urumqi 830011,China;Geological Research Institute of Xinjiang Uygur Autonomous Region,Urumqi 830091,China;Xinjiang Yaxin Coalbed Methane Investment and Development(Group)Co.,Ltd.,Urumqi 830009,China;School of Resources and Geosciences,China University of Mining and Technology,Xuzhou 221000,China)

机构地区：[1]新疆大学地质与矿业工程学院,新疆乌鲁木齐830047 [2]怀柔国家实验室新疆基地(新疆研究院),新疆乌鲁木齐830011 [3]新疆维吾尔自治区地质研究院,新疆乌鲁木齐830091 [4]新疆亚新煤层气投资开发(集团)有限责任公司,新疆乌鲁木齐830009 [5]中国矿业大学资源与地球科学学院,江苏徐州221000

出　　处：《煤炭科学技术》2025年第3期151-160,共10页Coal Science and Technology

基　　金：新疆维吾尔自治区天山英才计划资助项目(2023TSYCLJ0005);国家自然科学基金资助项目(42462021);国家科技重大专项资助项目(2024ZD1406000)。

摘　　要：近年来,新疆高挥发分烟煤储层成为我国煤层气开发的聚焦领域。煤层气修井停抽可导致储层贾敏伤害,进而减小煤层气井单井产能。以新疆高挥发分烟煤岩心为研究对象,通过物理模拟试验研究了高挥发分烟煤储层排采过程贾敏伤害形成特征,并利用低场核磁共振技术分析了伤害过程特征和贾敏伤害后气相占据的孔裂隙空间。结果表明:①单相水流阶段平行层理煤心水相渗透率(0.872×10^(−3)~1.066×10^(−3)μm^(2))高出垂直层理煤心水相渗透率(0.064×10^(−3)~0.112×10^(−3)μm^(2))1个数量级。贾敏伤害稳态后平行层理和垂直层理煤心渗透率伤害率分别达40.60%、50.00%;②贾敏伤害后煤心部分水不可流动且其体积随时间增大体积增大,导致贾敏伤害后水驱过程渗透率递减;③物理模拟表明,重新开井排采无法通过地层水驱将修井停抽聚集的气体完全驱替出岩心,气体聚集成团位于中孔和大孔及裂隙中,占据渗流孔裂隙空间,导致水相渗透率减小,抑制煤层气井重新打开后排水降压;④建议通过加强气井管理、延长修井检泵周期、保持排采稳定、研制抑制贾敏的消泡剂、实施脉冲激励淘洗等方式弱化近井地带储层贾敏伤害,释放低产煤层气井产能。In recent years,the high volatile bituminous coal reservoir in Xinjiang has become the focus area for Coalbed Methane(CBM)development.The Jamin effect in the reservoir can be caused by well repair and pumping suspension,which in turn reduces the single-well productivity of CBM wells.This paper takes the high volatile bituminous coal reservoir in Xinjiang as the research object,studies the characteristics of Jamin damage formation during the drainage process in high volatile bituminous coal reservoirs through physical simulation experiments,and uses low-field nuclear magnetic resonance technology to analyze the characteristics of the damage process and the porefracture space occupied by gas phase after Jamin damage.The results show that:①The permeability of the water phase in the parallel bedding coal sample(0.872×10^(−3)~1.066×10^(−3)μm^(2))in the single-phase flow stage is one order of magnitude higher than that of the vertical bedding coal sample(0.064×10^(−3)~0.112×10^(−3)μm^(2)).The water phase permeability damage rate after Jiamin in parallel bedding and vertic-al bedding coal samples at steady-state reached 40.60%and 50.00%,respectively.②After Jiamin damage,part of the water in coal core becomes non-mobile,and the volume of this part increases over time.This increase in volume leads to a decrease in permeability during the post-Jiamin waterflooding process.③The physical simulation suggests that when a CBM well temporarily halted for maintenance,the accumulated gas within the reservoir cannot be fully displaced by the formation water during subsequent re-opening and waterflooding.The gas tends to cluster in the medium and large pores and fractures,occupying the pore space for fluid flow.This leads to a reduction in water permeability and inhibits the effective removal of water upon re-opening of the CBM well,resulting in reduced drainage efficiency and pressure reduction.④It is recommended to reduce Jamin damage in the vicinity of the well and release the productivity of low-yield CBM w

关 键 词：煤层气 贾敏伤害 储层伤害 低场核磁共振 物理模拟 

分 类 号：TD844[矿业工程—煤矿开采]