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1、第31卷第1期石油鉆采工藝V01.3lNo.12009年2月OILDRILLING&PRODUCTIONTECHN0LOGYFeb.2009文章編號:1000—7393(2009)01—0038—04深部開窗側鉆井元壩1一側1井固井技術陳道元趙洪濤(中原油田固井工程處,河南濮陽457331)摘要:元壩1一側1井是在元壩1井的基礎上進行開窗側鉆的一1:2重點探井,目的是為了進一步揭示元壩地區(qū)礁灘相儲層氣藏情況。完鉆斜深7427.23m,0146.1mtn無接箍尾管下深7425.8lm,是目前川東北地區(qū)完鉆和套管下深最深的一口井。具有井深、溫度高、壓力高
2、、鉆井液密度高、環(huán)空間隙小、井斜、位移大、裸眼段長、小間隙、無接箍套管不能加裝扶正器、套管在井眼中居中困難、地層破裂壓力梯度不詳、面臨井漏等技術難題。通過采取優(yōu)選抗高溫水泥漿體系、加重隔離液體系。合理設計入井管柱結構,采用平衡壓力固井技術,改進配漿方式等一系列技術措施固井。保證了套管順利下入,解決了井漏、頂替效率低、施工泵壓高、氣體竄槽等問題。固井施工順利,測井解釋固井質量優(yōu),為超深井、小間隙井固井提供了可借鑒的依據(jù)。關鍵詞:超深井;側鉆井;尾管固井;固井質量;元壩1一側1井中圖分類號:TE256-3文獻標識碼:BCementingtechnolog
3、yforYuanbaNo.1-sideldeepsidetrackingwellCHENGDaoyuan,ZHAOHongtao(CementingCompanyofZhongyuanPetroleumExplorationBureau,Puyang457331,China)Abstract:YuanbaNo.1一side1wellisanimportantaside—trackingexplorationwellbasedonYuanbaNo.1,whichisdisposedtorevealthesituationofreefbeachphase
4、payzonegasreservoirsinYuanbaarea.Itiscurrentlythedeepestwellwiththefinalinclineddepth7427.23mandtheruninhole(Rm)depthoftheflushliner0146.1min7425.81minsoutheasternSichuan.Itfeaturesinhightemperatureandpressure,highdrillingfluiddensity,smallannularclearance,inclinedwellbore,grea
5、tofset,longopenhole,andsmallclearance.Inaddition,alotoftechnicalproblemsneedtobesolved.Forinstance,centralizerscannotbeaddedtotheflushcasing,tokeepcasingcentralizedinsidethewellboregetsdificult,andcirculationlossislikelytooccur.Systematiccementingmethodsaread—opted,suchastheopt
6、imizationofhightemperatureresistancecementingslurrysystemandweightedspacerfluidsystem,therationaldesignofRIHstringcombination,theuseofbalancedpressurecementingtechniques,andtheimprovementofslurrymakingmethod.Allthemethodsensurethecasingisruninholesuccessfully,solvingtheproblems
7、likecirculationloss,poordisplacement,highpumppressure,andgaschanneling.Cementingoperationrunssuccessfully,andlogginginterpretationshowsthecementingqualityisexcel—lent.ThesuccessfulwellcementingcreatestherecordofultradeepwellcementinginsoutheasternSichuan,providingusefulreferenc
8、eforcementingofultradeepwellsandwellsofsmallclearancei