Abstract:  Yongjin Oilfield is located in the southern margin of the Junggar Basin, in the western section of Changji Sag in the central depression of the Junggar Basin. During the exploration and development, wellbore instability in Qingshuihe Formation and Xishanyao Formation is prominent. Several wells have been drilled with accidents like collapse, reaming, and sticking. An all-oil synthetic drilling fluid system was formulated, suitable for Yongjin Oilfield. It has been successfully applied in Well Yong 3-Ceping x, wall instability, suspension carrying, lubrication and sticking problems are solved, It provides the successful experience for exploration and development of Yongjin Oilfield and technical support for adjacent well drilling.

Key words:  , all-oil base, synthetic base, drilling fluid,borehole wall stability, yongjin oilfield

摘要：  永进油田位于准噶尔盆地南缘，区域构造上位于准噶尔盆地中央坳陷昌吉凹陷西段，在勘探开发中 清水河组和西山窑组的井壁失稳问题突出，已完钻的数口井均出现坍塌掉块、划眼、卡钻等事故。研制适用于永进 油田的全油合成基钻井液体系配方，并在永 ３－侧平 ×井成功应用，解决了井壁失稳、悬浮携带、润滑防卡等难题， 为永进油田的勘探开发取得了成功经验，为邻井钻探提供了技术保障。

关键词:  全油基, 合成基, 钻井液, 井壁稳定, 永进油田