CAJ | 학술논문

针对鄂尔多斯盆地超低渗气藏开发井地层古老、砂砾岩及石英砂岩可钻性差、研磨性强、夹层多、非均质性强、有效应力高、井斜、井漏、井壁失稳、井喷、卡钻、跳钻等地层特性与井下复杂情况，从地质和工程2个因素分析了钻井过程中面临的技术难点，提出了优化钻具组合、优选钻头类型、优选钻井液、优化气层保护完井液、钻具失效预防等技术对策与措施。现场应用结果表明，有效地解决了鄂尔多斯盆地山西组开发井的钻井难题，使该井实际钻井周期缩短30%，机械钻速提高10%，为鄂尔多斯盆地超低渗气藏开发井的有效钻进和储层保护提供了技术参考。
침대악이다사분지초저삼기장개발정지층고로、사력암급석영사암가찬성차、연마성강、협층다、비균질성강、유효응력고、정사、정루、정벽실은、정분、잡찬、도찬등지층특성여정하복잡정황，종지질화공정2개인소분석료찬정과정중면림적기술난점，제출료우화찬구조합、우선찬두류형、우선찬정액、우화기층보호완정액、찬구실효예방등기술대책여조시。현장응용결과표명，유효지해결료악이다사분지산서조개발정적찬정난제，사해정실제찬정주기축단30%，궤계찬속제고10%，위악이다사분지초저삼기장개발정적유효찬진화저층보호제공료기술삼고。
In line with formation characteristics and downhole complicated conditions like old age of formations in development wells for ultra-low permeability gas pools in Ordos, poor drill ability of sandy conglomerate and quartz sandstone, strong abrasion, too many interbeds, high heterogeneity, high effective stress, hole deviation, lost circulation, unstable wellbore, blowout, stuck pipe, bit bouncing, etc., analysis of technical dififculties during drilling was conducted in terms of geology and engineering, and technical coun-termeasures and measures were proposed regarding optimized BHA, optimized bit types, optimized drilling lfuid, optimized completion lfuid for gas reservoir protection and prevention of drill string failure. The ifeld application shows that these measures have effectively solved the drilling dififculties in development well of Shanxi well group in Ordos Basin, and the drilling cycle of this well was reduced by 30%and drilling rate up by 10%, providing technical reference for effective drilling of ultra-low permeability gas pool by development wells and reservoir protection in Ordos Basin.