Thru Tubing Inflatable Retrievable Bridge Plug Deployed on Coiled Tubing in Low Pressure Gas Wells with ID Restrictions for Workover Operations - A Case History from China

Abstract

A workover campaign in low bottomhole pressure gas wells in China South Sea was planned, where a through tubing retrievable inflatable bridge plug (TTIRBP) was chosen to provide zonal isolation. Challenging circumstances include zero fluid contamination allowed, small through tubing restriction as opposed to large setting ID, shallow working depth and tight working schedule to complete the workover activity during the typhoon season. To mitigate the fluid contamination challenge, Nitrogen-driven setting of TTIRBP was selected. Through Tubing Intervention (TTI) services were safely and successfully completed by nitrogen-driven in all six wells via coiled tubing deployment and met the customer workover schedule deadline. After that, these gas wells were recovered to the same initial production rate quickly and efficiently. This paper will provide operational details for the 6 wells in this campaign. These methods are described in detail to share the valuable experience for readers’ similar application.