煤层气井注水泥顶替效率研究.pdf

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1、第42卷第3期煤田地质与勘探Vl01．42NO．32014年6月CoALGE0LoGY&EXP10RⅡ0NJun．2014文章编号：1001-1986(2014)03．0043．04煤层气井注水泥顶替效率研究张立刚，金显鹏2，吕德庆r1．东北石油大学石油工程学院，黑龙江大庆163318；2．大庆油田有限责任公司井下作业分公司，黑龙江大庆163412)摘要：煤层低压易塌、易漏造成煤层段井眼不规则，扩径严重，使注水泥过程顶替效率降低，影响水泥浆的封固效果。运用CFD数值模拟方法，结合鹤岗煤层气井测井数据，模拟了煤层

2、段不同扩径长度、扩径率、井斜角、套管居中度、水泥浆流变参数及顶替流态下的体积顶替效率及截面顶替效率值；分析了各因素对顶替效率的影响规律。结果表明，扩径段长度增加，顶替效率提高；扩径率、井斜角及偏心度增加，顶替效率降低；宾汉流体及幂率流体均存在顶替效率最高的流变参数值，顶替流态建议采用塞流顶替。研究成果为煤层气井安全优质固井提供了技术指导。关键词：煤层气；顶替效率；CFD数值模拟；注水泥中图分类号：P634文献标识码：ADOI：10．3969~．issn．1001．1986．2014．03．010Displace

3、mentemciencyofcementinginCBMwellZHANGLigang，JINXianpengz，LYUDeqingz(1．PetroleumEngineeringDepartment，NortheastPetroleumUniversity，Daqing163318，China；2．DownholeServicesBranch，DaqingOitfieldCompanyLtd,PetroChina，Daqing163412，China)Abstract：Duetosomecharacteris

4、ticsofthecoalseamsuchasthelowpressure，easytocollapseandleakage，re-suitingintheirregularboreholeincoalseamsegmentsandseriousholeenlargement，thedisplacementeficiencyintheprocessofcementingisreduced，whichafectsthesealingefectsofslurryincementing．Inthispaper,thr

5、oughtheuseofCFDnumericalsimulationmethod，combinedwithHegangCBMwellloggingdata，variousparametersofthediferentcoalseamsegmentssuchasthelengthoftheholeenlargement，holeenlargementratio，deviationangle，thecentralisationdegreeofcasing，theslurryrheologicalparameters

6、andthevalueofvolumedisplacementeficiencyunderthereplacementfuidstateandcross-sectiona1displacementeficiencyaresimulated．Theinflu．enceofvariousfactorsonthedisplacementeficiencyisanalyzed．Thedisplacementeficiencywillbeimprovedwiththelengthoftheholeenlargements

7、egmentincreasing．Onthecontraryitwillbereducedwiththeholeenlargementratio，thedeviationangleandtheeccentricityboosting．Binghamfluidandpowerlawfluidbothhavethehighestrheologicalparametervaluesofdisplacementeficiency．Theplugflowdisplacementisrecommendedunderrepl

8、acementfluidstates．TheaboveresearchresultshaveprovidedthetechnicalguidanceforthesafeandhighqualitycementingofCBMwells．Keywords：CBM；thedisplacementeficiency；CFDnumericalsimulation；cementing煤层气俗称瓦