May 30, 2010
Top kill fails
Efforts to stop the flow of oil from the Deepwater Horizon well using the "top kill" and "junk shot" techniques simply did not work.
Yesterday, the decision was taken to move on to the next option: the Lower Marine Riser Package (LMRP) Cap Containment System.
BP started the "top kill" operations at 1300 CDT on May 26, 2010.
The procedure was intended to stem the flow of oil and gas and ultimately kill the well by injecting heavy drilling fluids through the blow-out preventer on the seabed, down into the well.
Despite successfully pumping a total of over 30,000 barrels of heavy mud, in three attempts at rates of up to 80 barrels a minute, and deploying a wide range of different bridging materials (the "junk shot"), the operation did not overcome the flow from the well.
The LMRP Cap Containment System operational plan first involves cutting and then removing the damaged riser from the top of the failed Blow-Out Preventer (BOP) to leave a cleanly-cut pipe at the top of the BOP's LMRP. The cap is designed to be connected to a riser from the Discoverer Enterprise drillship and placed over the LMRP with the intention of capturing most of the oil and gas flowing from the well. The LMRP cap is already on site and BP anticipates that it will be connected in about four days.
This operation has not been previously carried out in 5,000 feet of water and the successful deployment of the containment system cannot be assured.
Drilling of the first relief well continues and is currently at 12,090 feet. Drilling of the second relief well was temporarily suspended but is expected to recommence shortly from 8,576 feet.