Abstract: A method for determining integrity of annular seals in wellbores. In an embodiment, two wellbores are selected that extend through a common geological formation which is capable of sealing against casing sections located in the wellbores. A pressure test is typically carried out in a first of the wellbores to check that the formation provides an effective seal, and a logging tool is typically run to obtain well log data from which can be derived a characteristic response that is associated with the formation providing an effective annular seal around the casing section in the first wellbore. A logging tool may then be run in the second of the wellbores to obtain a second set of well log data, which are comparable with the characteristic response to determine whether the formation provides an effective annular seal in the second wellbore.

Abstract: A method for determining integrity of annular seals in wellbores. In an embodiment, two wellbores are selected that extend through a common geological formation which is capable of sealing against casing sections located in the wellbores. A pressure test is typically carried out in a first of the wellbores to check that the formation provides an effective seal, and a logging tool is typically run to obtain well log data from which can be derived a characteristic response that is associated with the formation providing an effective annular seal around the casing section in the first wellbore. A logging tool may then be run in the second of the wellbores to obtain a second set of well log data, which are comparable with the characteristic response to determine whether the formation provides an effective annular seal in the second wellbore.