煤矿深部膨胀性泥岩钻孔变形机理及控制技术数值研究
|
摘要
煤矿深部膨胀性泥岩钻孔水力排渣过程中,围岩膨胀变形和岩性软化,使钻孔缩径严重。提出一种聚胺钻孔液成孔新技术,利用数值模拟软件ANSYS模拟分析了钻孔液浸泡前后煤矿膨胀性泥岩钻孔周围应力场和位移变化,在现场抽放钻孔进行了应用,稳定孔壁效果显著。试验结果表明聚胺钻孔液浸泡后,钻孔围岩等效应力增加,围岩稳定性增强,钻孔缩径量明显降低,有效防止了膨胀性泥岩钻孔缩径卡钻、夹钻,增加了钻孔抽放时间。
In the process of hydraulic slagging in expansive mudstone borehole in deep coal mine,surrounding rock deformation and softening and borehole shrinkage were obvious and serious.A new drilling technique using polyamine drilling fluid was proposed,and the stress field and displacement changes around the borehole in the expansive mudstone before and after drilling fluid soaking were analyzed by numerical simulation software ANSYS.The results were applied to gas drainage and drilling,and the stabilizing effect was great.The test results showed that when the surrounding rocks were soaked by the polyamine drilling fluid,the equivalent stress of borehole surrounding rock was increased,while the stability of surrounding rock was improved and the borehole shrinkage was decreased,which effectively prevented the jamming and sticking of drilling tool in expansive mudstone and increased the borehole gas drainage time.
In the process of hydraulic slagging in expansive mudstone borehole in deep coal mine,surrounding rock deformation and softening and borehole shrinkage were obvious and serious.A new drilling technique using polyamine drilling fluid was proposed,and the stress field and displacement changes around the borehole in the expansive mudstone before and after drilling fluid soaking were analyzed by numerical simulation software ANSYS.The results were applied to gas drainage and drilling,and the stabilizing effect was great.The test results showed that when the surrounding rocks were soaked by the polyamine drilling fluid,the equivalent stress of borehole surrounding rock was increased,while the stability of surrounding rock was improved and the borehole shrinkage was decreased,which effectively prevented the jamming and sticking of drilling tool in expansive mudstone and increased the borehole gas drainage time.
引文
[1]袁亮,薛俊华,张农等.煤层气抽采和煤与瓦斯共采关键技术现状与展望[J].煤炭科学技术,2013(9)
[2]黄盛初,刘文革,赵国泉.中国煤层气开发利用现状及发展趋势[J].中国煤炭,2009(1)
[3]何满潮.煤矿软岩工程技术现状及展望[J].岩土力学,1999(8)
[4]刘光廷,胡昱,李鹏辉.软岩遇水软化膨胀特性及其对拱坝的影响[J].岩石力学与工程学报,2006(9)
[5]Amer A.Al-Rawas.The factors controlling the expansive nature of the soils and rocks of northern Oman[J].Engineering Geology.1999(53)
[6]王波.软岩巷道吸水膨胀变形量计算分析[J].中国煤炭,2011(5)
[7]翟成,李贤忠,李全贵.煤层脉动水力压裂卸压增透技术研究与应用[J].煤炭学报,2011(12)
[8]张震,梁金燕,林柏泉等.穿层钻孔割缝混合强化预抽煤巷条带消突机制研究及应用[J].中国煤炭,2013(5)
[9]许超,石智军.煤矿井下定向钻进钻孔事故的预防及处理[J].煤田地质与勘探,2014(3)
[10]姚宁平,张杰,李乔乔.煤矿井下近水平定向钻技术研究与应用[J].煤炭科学技术,2011(10)
[11]邱正松.钟汉毅,黄维安.新型聚胺页岩抑制剂特性及作用机理[J].石油学报,2011(4)
[12]缪协兴.用湿度应力场理论分析膨胀岩巷道围岩变形[J].中国矿业大学学报,1995(1)
[2]黄盛初,刘文革,赵国泉.中国煤层气开发利用现状及发展趋势[J].中国煤炭,2009(1)
[3]何满潮.煤矿软岩工程技术现状及展望[J].岩土力学,1999(8)
[4]刘光廷,胡昱,李鹏辉.软岩遇水软化膨胀特性及其对拱坝的影响[J].岩石力学与工程学报,2006(9)
[5]Amer A.Al-Rawas.The factors controlling the expansive nature of the soils and rocks of northern Oman[J].Engineering Geology.1999(53)
[6]王波.软岩巷道吸水膨胀变形量计算分析[J].中国煤炭,2011(5)
[7]翟成,李贤忠,李全贵.煤层脉动水力压裂卸压增透技术研究与应用[J].煤炭学报,2011(12)
[8]张震,梁金燕,林柏泉等.穿层钻孔割缝混合强化预抽煤巷条带消突机制研究及应用[J].中国煤炭,2013(5)
[9]许超,石智军.煤矿井下定向钻进钻孔事故的预防及处理[J].煤田地质与勘探,2014(3)
[10]姚宁平,张杰,李乔乔.煤矿井下近水平定向钻技术研究与应用[J].煤炭科学技术,2011(10)
[11]邱正松.钟汉毅,黄维安.新型聚胺页岩抑制剂特性及作用机理[J].石油学报,2011(4)
[12]缪协兴.用湿度应力场理论分析膨胀岩巷道围岩变形[J].中国矿业大学学报,1995(1)