Analysis of Multiple Annular Pressure in Gas Storage Well and High-Pressure Gas Well

In gas storage or high-pressure wells, annular pressure is an unavoidable threat to safe, long-term resource production. The more complex situation, however, multiple pressure, which means happens in not only one annulus but two more. Such a situation brings serious challenges the identification of well integrity. However, few researches analyze phenomenon pressure. Therefore, this paper studies mechanism multi-annular provide foundation for its prevention and diagnosis. Firstly, classified according field data. Then failure function wellbore safety barriers process passage formation are analyzed. Finally, some suggestions put forward identifying controlling results show that wells have conditions generate channels, leads expansion from single annuli. channel composed tubing string, casing cement mantle, failures among three causal hierarchical relationships. According direction, it can be divided into types: tubing-casing annulus, former harmful. Some measures considered prevent channeling, including improvement cementing quality, revision maximum allowable suitable frequency relief.