method for determining the integrity of an annular seal in a wellbore, and wellbore apparatus

摘要

method for determining the integrity of an annular seal in a wellbore, and apparatus for wellbore and describing a method for determining the integrity of annular seals in wellbore. In one embodiment, two wells are selected that extend through a common geological formation that is capable of sealing against casing sections located in the wells. a pressure test typically is performed on a first of the wellbores to check if the formation provides an effective seal, and a logging tool typically is operated to obtain well log data from which it can be derived. a characteristic response that is associated with forming by providing an effective annular seal around the casing section in the first well bore. a logging tool can then be operated on the second of the wellbores to obtain a second set of well logging data comparable with the characteristic response to determine if the formation provides an effective annular seal on the second wellbore.