The great Gulf of Mexico oil spill of 2010 is rapidly moving towards the status of the worst accident in U.S. history, as it is clear that with more oil pouring out of the well every day, it will soon surpass the level of the Valdez spill by Exxon Mobil (NYSE:XOM).

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Beyond Environmental Impact
While most of the attention of the world has correctly been focused on the environmental consequences of this spill, the accident has a direct impact on many publicly-traded companies in the energy industry, including the operator of the rig, the rig owner and the oil service companies that provide services on the rig.

Many of these stocks have plunged over the last two weeks as investors overreacted to the possible financial implications of the accident.

Operator
On April 20, 2010, a fire and explosion was reported on a rig at the Macondo Prospect in the Gulf of Mexico on Mississippi Canyon Block 252 operated by BP (NYSE:BP). It's not exactly clear at this point what the cause of the explosion was, but speculation has focused on the blow out preventer (BOP), which is used to control formation pressure on the well.

BP probably has insurance to clean up the oil spill, and if that runs out, the company has deep pockets and can use its owns funds. BP had cash and equivalents of $6.8 billion, and was under-levered with a net debt to capital ratio of 19%, as of March 31, 2010.

Anadarko Petroleum (NYSE:APC) has a 25% working interest in Macondo, but BP, as the operator of the well, has the responsibility for drilling.

Rig Owner
The explosion occurred on the Deepwater Horizon rig, owned by Transocean (NYSE:RIG). The Deepwater Horizon is a semi-submersible that was built in 2001. The rig started working for BP in September 2007, and was contracted out for three years starting at a day rate of $278,000. This day rate escalated during the life of the contract and reached $458,000 per day in March 2008, and was to reach $517,000 per day by the end of the term in September 2010. The rig was insured for $560 million, including costs of removal if needed.

Blowout Preventer
The BOP on the rig came from Cameron International Corp (NYSE:CAM), which was using the Cameron Type TL double blowout preventer with a 18.75 inch bore size and rated up to 15,000 psi. Cameron also provided the Deep Water, High Capacity (DWHC) wellhead connector, which was designed especially by the company for deepwater drilling of the type that BP was conducting.

Halliburton (NYSE:HAL) provided cementing services on the well and completed the final production casing string about a day before the incident occurred. Other major oil service companies operating in the oil rig industry include Schlumberger (NYSE:SLB) and Smith International (NYSE:SII).

Bottom Line
The clean up cost and ultimate liability for the Gulf of Mexico oil spill is unknown at this point, but the market is under going its usual spasm of overreaction, perhaps providing an opportunity for more rational and long term players. (For more information about the economics of natural disasters, refer to The Economics Of Natural Disasters.)

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