This paper extensively analyzes a drilling incident in a well within the Bohai oilfield,focusing on an 8-1/2"borehole section.It provides a comprehensive examination of the causes and management of the drilling blockage from both subjective and objective perspectives.The analysis revolves around geological,engineering,and personnel-related factors contributing to the complex situation.Recommendations proposed encompass measures such as optimizing mud circulation,conducting thorough assessments of drilling fluid properties,and pre-emptive stability testing of borehole walls.These suggestions aim to mitigate and prevent similar incidents in future drilling operations.
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