近日,大港油田技術(shù)人員在趙東油田攻克高難度大斜度井長穩(wěn)斜段鉆完井難題,高質(zhì)量完成D45-40井的下尾管及固井作業(yè),以2645米的長度刷新國內(nèi)側(cè)鉆井尾管下入最長紀(jì)錄。D45-40井是趙東油田投入開發(fā)以來施工難度最大的一口側(cè)鉆井,定向井難度系數(shù)達(dá)6.679,屬于高難度定向井。
趙東油田位于極淺海區(qū),是中國石油灘海油田高效開發(fā)的標(biāo)桿?;诤I祥_發(fā)的特點(diǎn),油田井口需要被不斷重復(fù)使用,趙東油田已形成密集叢式井復(fù)雜井網(wǎng)軌跡,后期新鉆井以老井開窗側(cè)鉆為主。
由于大斜度井長穩(wěn)斜段過長,在尾管下入過程中多次遇阻,陸地技術(shù)團(tuán)隊(duì)24小時(shí)提供支持,海上監(jiān)督團(tuán)隊(duì)24小時(shí)在鉆臺(tái)輪換堅(jiān)守,嚴(yán)格執(zhí)行各項(xiàng)措施。最終,該井歷經(jīng)39個(gè)小時(shí)成功完鉆,井身質(zhì)量合格率達(dá)100%,固井質(zhì)量合格率達(dá)100%,鉆井費(fèi)用較單井投資預(yù)算節(jié)約174萬元。
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