长水平段水平井砂桥卡钻反循环加压处理方法

随着大牛地气田开发的不断深入,水平井逐渐增多,长水平段水平井数量也不断增加。由于该气田目的层水平段夹层较多,施工过程中井壁失稳问题突出,易形成砂桥卡钻。与直井相比,水平井砂桥卡钻的处理方法较少,处理成本高,且不能彻底有效解除事故。针对砂桥卡钻的特点和难点,分析了大牛地气田长水平井中砂桥卡钻的形成原因及处理难点,提出了解卡新方法——反循环加压法,详细介绍了该方法的工作原理、利用该方法时常见的2种情况、实施条件及注意事项。该方法在大牛地气田DP16井、DP22井和DP17井等水平井砂桥卡钻处理中进行了应用,均取得成功,且效果良好,逐渐形成为适合大牛地气田的快速有效的卡钻处理方法。

Reverse Circulation and Pressurization Technology for Sand Bridge Sticking in Long Horizontal Wells

With the further development of Daniudi Gas Field,horizontal wells with long horizontal sections were used progressively.Due to the interbedded layers in the target zone,the wellbore stability is a prominent problem which results in sand bridge sticking.Compared with vertical wells,there are less treatment options for sand bridge sticking in horizontal wells.The cost is high and the problems cannot be eliminated completely.Considering the characteristics and difficulties of sand bridge sticking,this paper a...