钻孔漏失冲洗液，在孔壁不稳定的情况下，往往引起孔内坍塌、掉块和缩径，轻则影响钻进，重则造成孔内事故。我们在生产实践中，曾根据漏失程度分为轻微漏失，中等漏失和严重漏失三类，并根据不同漏失程度选择不同的堵漏方法，取得了较好的效果，现简介如下： Drilling fluid leakage loss, in the case of pore wall instability, often caused by collapse of the hole, fell off and reduced diameter, ranging from the impact of drilling, heavy cause hole accident. In our production practice, we have divided into three categories according to the degree of leakage: slight loss, medium loss and serious loss. According to the different degree of leakage, we have chosen different methods of plugging and achieved good results. The brief introduction is as follows: