钻孔漏失所以成为复杂地层钻进中的一个难题，主要是没有一个钻孔漏失分类，由于不了解漏失通道大小和形状，不能根据不同大小的漏失通道选择与之相适应的堵漏浆液，以至造成堵漏材料全部漏失掉或全部残留在孔内而不进入漏失通道，导致堵漏失败。 Drilling holes so it becomes a complex formation drilling in a problem, mainly without a drilling leakage classification, due to lack of understanding of the size and shape of the lost channel can not be based on different size of the missing channel selection and its corresponding plugging slurry, and even Resulting in the loss of all plugging material lost or all remaining in the hole without entering the loss of access, leading to plugging failure.