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Title: Annulus Communications Diagnostics And Repair Using Pressure-Activated Sealant
Author: David W. Rusch
Source: American Gas Association 2005
Year Published: 2005
Abstract: Sustained casing pressure has been experienced in a number of underground storage wells. Sustained casing pressure can be a significant safety hazard and, on a number of occasions, has resulted in uncontrolled releases from such wells. Sustained casing pressure results from the migration of fluids in the annulus. The most common path for migration of fluids is through channels in the annular cement. To safely and economically eliminate sustained casing pressure on storage wells, an injectable pressureactivated sealant technology has been used to seal channels in the annular cement of the welsl and eliminate the casing pressure. The mechanical integrity of the wells has been restored using this technology.

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