Cause analysis and treatment measures of formation respiration effect in deep water drilling
In Marine deep water blocks for drilling,because the formation is under compacted,the formation collapse pressure and leakage between the safety working pressure small window,homework during annulus equivalent circulating density(ECD)easily exceed the equivalent density of formation leakage pressure,breathing effect on formation,drilling fluid into the formation during drilling,When the pump is stopped,the formation vomits back and overflow occurs.The effect of formation respiration is very similar to that of overflow,making it difficult to distinguish between the two conditions in the field,resulting in a waste of time and increased operational risk.In this paper,treatment measures based on respiratory effect in a well in the Gulf of Mexico,the causes of the formation respiratory effect are analyzed,the identification method of the formation respiratory effect is established,the prevention method of the formation respiratory effect is described,and the treatment measures that can be taken for the occurrence of the formation respiratory effect are summarized,so as to provide reference and technical support for the field construction operations to deal with the formation respiratory effect.
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