煤矿安全2017，Vol.48Issue(10)：5-8,4.DOI:10.13347/j.cnki.mkaq.2017.10.002
煤粉产出对煤层气井压裂裂缝渗透率的影响
Influence of Coal Fines Output on Permeability of Fracturing Fractures of CBM Well
摘要
Abstract
In order to reasonably control coal fines output of coalbed methane (CBM) well,taking high-rank coal in southern Qinshui basin as reseach object,permeability of fracturing fractures under different effective stress and different rate of water injection was measured.Based on the permeability,influence of coal fines output on permeabihty of fracturing fractures was discussed.The results show that with the increase of effective stress,permeability of fracturing fractures increases firstly and then decreases.When effective stress is equal to or less than 4 MPa,with the increase of effective stress,permeability of fracturing fractures declines rapidly because of the clogging of coal fines.When effective stress is more than 4 MPa,plastic deformation of coal matrix occurs,which causes the increase of permeability.When there is single grain size sand in fracturing fractures and the rate of water injection is equal to or less than 20 mL/min,the permeability declines rapidly because of the low water carrying capacity of coal fines and the serious clogging of coal fines.When rate of water injection is more than 20 mL/min,high velocity flow alleviates clogging of coal fines and the permeability has slowed down.When mixed sanding is in fracturing fractures,fracturing sand polishes the wall of fracturing fracture and causes the increase of permeability.关键词
高阶煤/煤粉产出/压裂裂缝/渗透率/沁水盆地南部/煤层气Key words
high-rank coal/coal fines output/fracturing fracture/permeability/southern Qinshui basin/coalbed methane分类
矿业与冶金引用本文复制引用
张学彦,刘世奇,桑树勋,杨延辉,杨艳磊,刘书培..煤粉产出对煤层气井压裂裂缝渗透率的影响[J].煤矿安全,2017,48(10):5-8,4.基金项目
国家自然科学基金资助项目(41402135,41330638,41272154) （41402135,41330638,41272154）
江苏省煤基CO2捕集与地质储存重点实验室(中国矿业大学)开放基金资助项目(2015A04) （中国矿业大学）
国家重点基础研究发展计划(973计划)资助项目(2009CB219608) （973计划）
