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1、第34卷第6期石油鉆采工藝Vo1.34No.62012年11月OILDRILLING&PR0DUCTIONTECHN0LOGYNOV.2012文章編號:1000—7393(2012)06—0036—03務(wù)古4井復(fù)雜深井鉆井液技術(shù)趙江印陳永奇劉志廣賈思航周鋒周春陽(1.渤海鉆探工程公司第四鉆井工程分公司,河北任丘062552;2.華北油田公司第三采油廠,河北河間0624503.華北油田公司第一采油廠,河北任丘062552)引用格式:趙江印,陳永奇,劉志廣,等.務(wù)古4井復(fù)雜深井鉆井液技術(shù)[J].石油鉆采工藝,2012,34(6):36-38.摘要:務(wù)古4井為一口重
2、點探井,完鉆井深5750m。該井二開裸眼井段鉆遇巨厚層泥巖,選用聚磺鉆井液體系,解決了地層嚴(yán)重造漿及井眼穩(wěn)定問題;三開裸眼井段存在多套壓力系統(tǒng)和多處斷層,鉆遇石膏、含膏泥巖、大套玄武巖以及凝灰?guī)r和碳質(zhì)泥巖等地層,特別容易發(fā)生坍塌和井漏,井壁極為不穩(wěn)定。現(xiàn)場采用有機鹽鉆井液體系,有效解決了石膏、膏泥巖污染和嚴(yán)重井壁垮塌導(dǎo)致的大段劃眼、嚴(yán)重蹩鉆及遇阻卡等復(fù)雜問題;添加低滲透處理劑和屏蔽暫堵劑及復(fù)合堵漏劑,提高井壁的承壓能力,解決了三開施工出現(xiàn)的壓差卡鉆風(fēng)險,確保了鉆井安全順利,完井電測一次成功,鉆井周期大幅度降低。關(guān)鍵詞:深井;聚磺鉆井液;有機鹽鉆井液;井壁穩(wěn)定;
3、務(wù)古4井中圖分類號:TE254文獻(xiàn)標(biāo)識碼:BComplexdeepwelldrillingfluidtechnologyforWellWugu一4ZHA0Jiangyin,CHENY0ngqi,LIUZhiguang,JIASihang,ZHOUFeng,ZHOUChunyang。(1.No.4DrillingCompany,BHDC,Renqiu062552,China;2.No.3ProductionPlant,HuabeiOilfieldCompany,Hejian062450,China3.No.1ProductionPlant,HuabeiOilfi
4、eldCompany,Renqiu062552,China)Abstract:WellWugu-4isakeyexplorationwellwithtotaldepthof5750m.Duringdrillingthe2ndintervalopenhole,thickmudstonewaspenetrated.Polysulfonatedrillingfluidwastakentosolvetheseriousmud—makingandwellborestabilityissues.Forthe3rdinterval,multiplepressuresyste
5、mandfaultswereencountered,andplaster,plastermudstone,hugebasalt,tuff,andblackswerepenetrated,whichmakesitpronetocollapse,leakingandwellboreinstability.Organicsaltdrillingfluidwastakentoslovetheissuesofreamingdown,bitbouncing,bitsticking,etc.Thelowpermeabilityadditive,temporaryblocki
6、ngagent,andsealingagentswereaddedtoimprovewellborepressurebearingability.Theriskofbitstickingfrompressurediferenceduringthe3rdintervaldrillingwassolvedanddrillingsafetywasensured.Thecompletionloggingwassuccessfulwithonlyonerun,andthedrillingcyclewasdecreasedsignificantly.Keywords:de
7、epwell;polysulfonatedrillingfluid;organicsaltdrillingfluid;wellborestability;WellWugu一4務(wù)古4井為冀中坳陷廊固凹陷楊稅務(wù)古背潛mmX4997.61TI;四開152.4mmX57501TI,裸眼山帶韓村潛山構(gòu)造的一口重點預(yù)探井,完鉆井深完井。眼完鉆井周期168.5d。5750113,鉆探目的是預(yù)探韓村一楊稅務(wù)古背斜奧鄰井務(wù)古2井完鉆井深5920.5m,施工中先后陶系潛山的含油氣性,落實韓村潛山的天然氣規(guī)劃眼129次,劃眼段長976ITI,嚴(yán)重蹩鉆542次,遇模。該井依次鉆遇第四
8、系的平原組和第三系的明阻卡376次,鉆