Fremgangsmåte og verktøystreng som tilveiebringer kontroll av transiente trykkforhold i en brønnboring.

摘要

A method and apparatus for use in a wellbore includes running a tool string to an interval of the wellbore, and activating a first component in the tool string to create a transient underbalance pressure condition in the wellbore interval. Additionally, a second component in the tool string is activated to create a transient overbalance pressure condition in the wellbore interval, or vice versa.