Hi I've got a scenario and would like a confirmation or rejection on it's correctness. If i lower a steel riser (for simplicity it is 3000 m and vertical, open ended, cylindrical steel pipe, completely flush) into drilling mud (assume water) the surface weight would be the steel weight in mud. When I set the riser down (say i latch it on to an existing riser that is already in place with top at ~3000m), the weight of the riser at surface immediately becomes the air weight of the riser when it latches. Correct?? In reality the steel would buckle a bit by the upforce before beeing latched and even more so when it is latched and surface pulling reduced to zero so the whole string rests on itself (far fetched, but example purpose). How does this affect the buoyancy force on the steel pipe?? does it contribute to the buoyancy force acting on the riser??