High pressure constant volume body identification and disposal method during drilling

Abstract

The present application relates to a kind of high-pressure constant-volume body identification and disposal method during drilling, belong to the technical field of well control during drilling.It includes: using the change rule and feature of standpipe pressure, casing pressure, mud pit increment and other mud logging parameters during the process of well closure and killing before and after overflow occurs, to determine whether high-pressure constant-volume body exists;After well closure after overflow, the volume of high-pressure constant-volume body is estimated using pressure return method;Using conventional pressure return method or engineer method to kill overflow caused by high-pressure constant-volume body drilled;Based on the pressure difference between high-pressure constant-volume body and well bottom, the formation pressure is released by maintaining micro-negative pressure difference at well bottom while drilling, to realize high-pressure constant-volume body while drilling pressure relief, gradually reduce the high pressure of high-pressure constant-volume body to normal pressure.The present application can greatly reduce the risk of drilling high-pressure constant-volume body, avoid high casing pressure that may occur during killing, and provide safety guarantee for subsequent drilling operations.

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