An imperfect cement seal at the top of a liner will allow gas from below to leak into the drilling annulus above a production liner. Conversely, with a pressure differential toward the formation, fluid can be lost from the annuli during drilling or during stimulation for production. Since perfect liner cementation is an elusive target, this paper will discuss briefly the cause and effect of the leaking liner top and list the options available for solving the associated problems.

This paper was written to address the problems encountered in the drilling and completion of deep high pressure gas wells; however, much of the information can be applied to wells drilled and completed under less rigorous conditions.

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