气体反循环钻井工艺在涪陵地区应用效果分析

Application analysis of gas reverse circulation in drilling technology in Fuling area

针对涪陵地区钻井过程中易发生漏失、卡钻等问题,在涪陵地区易漏失地层进行气体反循环钻井地面测试及现场试验。结果表明,反循环钻井技术能够很好地适用于涪陵地区易漏失地层,并且能获得较高的机械钻速,对井壁干扰性小,完钻井眼质量好。研究结果不仅进一步验证了气体反循环钻井工艺的现场效果,也可为类似地质特征的地区开展气体反循环钻井并扩大应用范围提供借鉴。

The applicability of the gas reverse circulation in drilling technology is evaluated in view of the problems such as leakage and sticking during drilling in Fuling area.Through the ground and field tests of gas reverse circulation drilling in the lost circulation formation,the following conclusions have been obtained.The reverse circulation drilling is not only suitable for the lost circulation formations,but with a high penetration rate,have little interference and high quality of finished borehole.The research results further verify the on-site effect of gas reverse circulation,and also provide a good guidance for areas with similar geological characteristics.