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1、第42卷第3期煤田地質(zhì)與勘探Vl01．42NO．32014年6月CoALGE0LoGY&EXP10RⅡ0NJun．2014文章編號：1001-1986(2014)03．0043．04煤層氣井注水泥頂替效率研究張立剛，金顯鵬2，呂德慶r1．東北石油大學(xué)石油工程學(xué)院，黑龍江大慶163318；2．大慶油田有限責(zé)任公司井下作業(yè)分公司，黑龍江大慶163412)摘要：煤層低壓易塌、易漏造成煤層段井眼不規(guī)則，擴徑嚴重，使注水泥過程頂替效率降低，影響水泥漿的封固效果。運用CFD數(shù)值模擬方法，結(jié)合鶴崗煤層氣井測井?dāng)?shù)據(jù)，模擬了煤層
2、段不同擴徑長度、擴徑率、井斜角、套管居中度、水泥漿流變參數(shù)及頂替流態(tài)下的體積頂替效率及截面頂替效率值；分析了各因素對頂替效率的影響規(guī)律。結(jié)果表明，擴徑段長度增加，頂替效率提高；擴徑率、井斜角及偏心度增加，頂替效率降低；賓漢流體及冪率流體均存在頂替效率最高的流變參數(shù)值，頂替流態(tài)建議采用塞流頂替。研究成果為煤層氣井安全優(yōu)質(zhì)固井提供了技術(shù)指導(dǎo)。關(guān)鍵詞：煤層氣；頂替效率；CFD數(shù)值模擬；注水泥中圖分類號：P634文獻標識碼：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煤層氣俗稱瓦
