The reason the oil spill has not been stopped by any of the attempts is because the problem is unimaginably worse than it already appears. Here's how it plays..... The upper string casing was never properly attached to the well head by the connecting rods, causing the varying pressure readings up to 2 weeks before the blowout we have seen talked about. The rubber in the mud was the grommet type seals (used to seal connect the well head to the upper string casing) that were damaged by the drill shaft and and casing not seating correctly. Just like an improperly installed o-ring in your kitchen sink.
These improper installations 99.9% of the time could be worked around. The fix is reinforce the concrete collar around the well head and the casing to bore hole wall concrete bond. What happened is the unconnected casing had sagged some distance from the well head and the kick rammed the outer string casing and connecter rods into the well head with at the very least 20000 psi, causing several things. The first of which is the connector rod(s) went through the well head and into the BOP causing the malfunction.
Next, the force badly damaged the cement collar used to reinforce the well head and keep it in place. The worst thing was, the kick broke away the concrete casing to bore hole wall bond allowing gas and oil to breach containment inside the casing through the gap from the damaged and unconnected upper casing to the well head and/or the connection between the 1st and 2d casing string(worse). When the rig sank the riser exerted a lot of downward and sideways force on the BOP and well head, further damaging the structure.
When the riser tore away, the flow through the it was restored and the channeling from the breached gas and oil ceased to follow the least resistant path. During top kill, every junk shot was imediatly followed by severe clouding of the water, debris and oil seemed to come up from below the camera. The shots slowed flow (increased pressure) for seconds and diverted the flow back through the breach in the well bore hole for a moment, until pressure increased enough to blow the pieces of bridging material out of the riser.
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The problem is not plugging or crimping a leaking pipe. If it was, that would have been accomplished long ago. If flow is stopped anywhere above the breach in the casing, the gas and oil will self vent through the breach, eroding an ever larger channel and ever increasing amounts of gas and oil will escape.This is the reality of the situation and why the majority of effort is being put into recovery and not plugging the leak........ Just thought ya should know!!!