Objective: Replace master valve on well. No vehicle access.
Well Information: 18mPa surface pressure with 2% H2S content.
Procedure: All personnel and equipment were flown into location from staging area. Portable lubricators filled with gel were flown into location. Wiper plug was installed in one end of lubricator and a portable 35mPa pressure washer was used to inject the freeze gel. Freeze plug was formed and pressure tested and master valve changed. Freeze plug was thawed by mother nature.
Time on location: 24 hours.