Abstract:To solve the complex repair problem of"accident plus accident"in a fluid observation well of a volcanic monitoring station,the construction team fully prepared a variety of drilling accident handling tools in the early stage,customized special casing milling tools with the manufacturer,and combined with on-site flexible tool processing to support the implementation of various accident handling methods such as"fishing,reversing,grinding,and casing milling".During the construction,the downhole TV system was used to accurately observe the conditions in the well,clearly grasping the position and state of the fallen objects;at the same time,the"mud non-landing"process was adopted to build a flushing fluid circulation system to avoid mud polluting the environment and realize green construction.Finally,the team successfully completed the repair of the observation well,fished out all the fallen objects in the well without causing secondary damage to the well wall.The repaired observation well can be used normally to place the probe monitoring instruments of the specified specifications into the well.This not only achieved significant economic benefits and restored nearly 2 million yuan from losses,but also ensured the subsequent development of volcanic monitoring work,with good social benefits.
