Application of Sidetracking Obstacle Avoidance Technology in Dealing with Falling Objects in Complicated Wells
In the process of drilling,a drill bit dropped and several salvage operations failed.In order to preserve the results of the upper well section and promote the follow-up work smoothly,it was decided to sidetrack the lost bit and the old hole section.How to maintain the stability of well wall,ensure the quality of cement plug and control the track of sidetracking is the key to this construction.For this reason,two schemes of sidetracking with open window and sidetracking with open hole are developed.After many arguments,the open hole sidetracking scheme is finally adopted to solve the accident successfully.This paper summarizes the comprehensive use of directional drilling technology,measurement while drilling technology,polymer drilling fluid and other technical measures to overcome a series of problems such as mud shale wall collapse easy,long stable inclined section pressure,large hole diameter sidetracking trajectory control difficulty,etc.,which provides valuable experience for salt wells to use sidetracking technology to deal with complex downhole objects.
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