欢迎来到天天文库
浏览记录
ID:46301348
大小:1.16 MB
页数:5页
时间:2019-11-22
《山西晋城采煤扰动区地面煤层气井抽采效果地质分析》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、2012年9月,第l8卷,第3期,563—567页高校地质学报September2012,Vo1.18,No.3,P.563—567GeologicalJournalofChinaUniversities山西晋城采煤扰动区地面煤层气井抽采效果地质分析田永东,张遂安,张典坤2,赵祉友,赵小山1.中国石油大-@(It京),北京102249;2.山西蓝焰煤层气集团有限责任公司,晋城048000摘要:从地质研究角度,分析了晋城矿区采煤扰动区三口地面煤层气井的抽采效果。结果表明,采动井布置需要综合考虑原位地质条件和采动后的矿井地质条件,煤层含气量较高、开放性采动裂隙发育、岩层移动相对较
2、弱的地段有利于采动井的井筒稳定和持续高产。采动井抽采过程一般经历三个阶段,即采煤工作面未达井筒阶段、采煤工作面靠近井筒阶段和采煤工作面远离井筒阶段,各阶段抽采量、浓度均表现出不同的特征。采动井的井身结构是影响抽采效果的重要工程因素,二开井段套管不固井的方式可以有效保护井身结构的完整性,但井简体系密闭性不好,受此影响导致抽采甲烷浓度偏低;三开井段采用裸眼完井方式能够有效提高抽采流量及甲烷浓度,但不利于井筒保持稳定。关键词:晋城;采动井;地质条件;抽采效果中图分类号:P618.11文献标识码:A文章编号:1006—7493(2012)03—0563—05GeologicalAna
3、lysisofDrainageEffectsonCBMWellsintheCoal—Mining-DisturbedAreaofJincheng,ShanxiProvinceTIANYongdong’,ZHANGSuian’,ZHANGDiankun,ZHAOZhiyou,ZHAOXiaoshan1.ChinaUniversityofPetroleum,Beijing102249,China;2.ShanxiLanyanCBMGroupCo.LTD,Jincheng048000,ChinaAbstract:Drainageeffectofthreecoalbedmethane
4、(CBM)groundwellsatacoal—mining—disturbedareaoftheJinchengminingdistrictwasanalyzedinthelightofthegeologicalresearch,whichprovidesanewreferencefortheCBMgroundextractioninChina.Resultsshowedthatthegeologicalconditionsin—situandaftercoalminingshoudbecomprehensivelyinvestigatedforthewell—sitede
5、signofthedisturbedarea.ItwasfoundthatthehigherCBMcontent,muchdevelopedopenminingfractureandweakerstratamovementarebeneficialtotheboreholestabilityandsustainablehighproduction.Thewholeprocessofthewelldrainagwentthroughthreestagesincludingboreholebeforecoalface,borcholenearcoalface,andborehol
6、eaftercoalface.TheproductionandconcentrationofCBMweredifferentateachstage.Casingprogramofthewellsisanimportantengineeringfactorthatcontroldrainageeffects.Non—cementingpatterncanprotecteffectivelytheintegrityofthecasingprograminthesecondsectionbutthemethaneconcentrationislowduetopoorsealingp
7、ropertyoftheboreholesystem.OpenholecompletionpatterncanimproveeffectivelytheextractionrateandmethaneconcentrationinthethirdsectionbutiSnotconducivetotheboreholestability.Keywords:Jincheng;coal—mining-disturbedwell;geologicalconditions;drainageeffectFirst
此文档下载收益归作者所有