Removing Trapped Air From Subsea Wells
04 August 2005
One rig devised a way of removing trapped air from the 30” CART in
subsea wells, that does not need ROVs and/or rope on handles. With
the CART engaged to the conductor, and set on the moonpool beams,
they found that pumping really hard can expel the air. Another team
questioned the need to expel air at all.
The same is true for 18.3/4" housings. Water depth (air complession)
should tell you if you need to or not. My experience in moderate
depth water has been that it isn't necessary, with a modest rig air
gap. The idea of pumping reasonably quickly makes good sense.
Whatever it takes to avoid people dangling on tuggers in the
moonpool gets my vote !