Eight miles north of the maritime border with Mexico, in waters a mile and a half deep, Shell Oil Co. is constructing the most ambitious offshore oil platform ever attempted in the Gulf of Mexico.

As tall as the Eiffel Tower, the floating production facility will be anchored to the ocean floor by moorings spanning an area the size of downtown Houston. Slated to begin operating late next year, this leviathan known as Perdido (or Lost) will cost billions and be capable of pumping 100,000 barrels of crude a day.

But Perdido’s most-notable achievement may be to compel Mexico to loosen its 70-year government monopoly on the petroleum sector, thanks to a phenomenon Mexicans have dubbed the “drinking straw effect.”

Mexicans fear that companies drilling in U.S. waters close to the border will suck Mexican crude into their wells. Actor Daniel Day-Lewis’ fictional oilman in “There Will Be Blood” likened the concept to siphoning a rival’s milkshake.


“When they take petroleum from the American side, our petroleum is going to migrate,” Sen. Francisco Labastida Ochoa, head of the Mexican Senate’s Energy Committee, told the newspaper Milenio recently.

Oil isn’t a simple commodity in Mexico. It’s a powerful symbol of national sovereignty. Rancor over foreigners profiting from its hydrocarbons -- namely America’s Standard Oil -- led Mexico to nationalize its industry in 1938. The state-owned oil company Pemex is forbidden by law from partnering with outsiders to exploit a drop of Mexican crude.

But for a growing chorus of Mexicans, sharing a milkshake is preferable to watching your neighbor drink it up. Mexico has no viable deepwater drilling program to match U.S. efforts near the maritime border. And it lacks an iron-clad legal means to defend its patrimony. Some are urging their government to partner with the U.S. to co-develop border fields or risk losing those deposits.

Mexican Energy Secretary Georgina Kessel has spoken repeatedly of her desire to negotiate such a pact. Cross-border fields are a hot topic in Mexico’s Congress. Lawmakers are embroiled in a heated debate on how to strengthen Pemex, which provides 40% of Mexico’s tax revenue but whose slumping output is alarming the nation.


Proposed legislation would still ban partnerships. But the consensus to permit some exception in the gulf region is growing as oil companies move closer to Mexican territory. The U.S. has issued drilling rights on dozens of parcels less than 10 miles from Mexican waters. Shell, BP, Chevron and Exxon Mobil, plus independents including Houston’s Bois d’Arc Energy, have secured acreage adjacent to the boundary.

“The pressure is forcing [legislators] to do something,” said Mexico City attorney David Enriquez, a maritime law expert who will testify at a Senate hearing today on transborder reservoirs. “It’s the one area where they are unified.”

It’s unclear whether big shared deposits even exist in the Gulf of Mexico. Historically, the region’s deepwater finds have been isolated pockets of petroleum, not mega-fields.

Officials at the U.S. Minerals Management Service, the federal agency that regulates U.S. offshore production, said they had no knowledge that any gulf reservoirs now under development crossed the international divide.


Shell, which is developing its Perdido platform with Chevron and BP, said the deposits they were targeting were confined to U.S. territory.

Mexicans are skeptical. A recent editorial cartoon showed a greedy Uncle Sam sucking from a straw plunged deep into the gulf. But Pemex hasn’t done the seismic and drilling work needed to determine if there is crude on its side.

All the more reason, Enriquez said, for Mexico to collaborate with the U.S. to find out what lies near the 470-nautical-mile gulf border and end all the speculation.

A spokesman for Minerals Management said his agency had worked with Mexico before on boundary issues and was open to discussing cross-border fields. “It’s the neighborly thing to do,” said Dave Cooke, deputy regional supervisor for resource evaluation for the agency in New Orleans.


Oil and gas fields straddle international borders all over the globe. Countries typically strike a “unitization agreement” to share the costs to extract the deposits and split the proceeds based on how much lies in each nation.

Britain has partnered with the Netherlands and Norway in the crowded North Sea. Australia and East Timor have a unitization agreement. So do Nigeria and Equatorial Guinea.

But the U.S. and Mexico have long skirted the topic, given their prickly history with oil.

Until recently, such an agreement wasn’t necessary. Both nations had plenty of shallow-water reserves to keep them occupied. Low oil prices didn’t justify the exorbitant costs of deepwater drilling, where a single well can cost $100 million or more.


But exploding crude prices and advances in seismic technology now have oil companies pushing into the farthest reaches of the U.S. gulf. Private operators snapped up a record $3.7 billion worth of leases at Mineral Management Services’ March auction, virtually all of them in deep water.

Since 1992, firms have drilled more than 2,100 wells at depths greater than 1,000 feet in the U.S. gulf. Pemex has drilled seven deepwater wells since 2004, none of which is producing, and none is likely to for years.

Therein lies the nation’s predicament. Mexico is the world’s sixth-largest crude producer, but production is in its fourth straight year of decline. Mexico could become a net oil importer within a decade if it doesn’t find new reserves fast.

Cantarell, a shallow-water gulf field in southern Mexico, is drying up after more than a quarter-century of production. April output averaged just over 1 million barrels a day, less than half of its peak in 2003.


Pemex says there are billions of untapped barrels in Mexico’s deep waters. But it lacks the capital and know-how to go after them.

A bill being pushed by President Felipe Calderon’s administration would make it easier for Pemex to hire the expertise it needs. But deep-water projects cost billions and can take a decade to come on line. Oil majors typically want a share of any crude that they find -- a standard industry practice forbidden by Mexico’s constitution.

It’s unclear whether a constitutional change would be necessary to let Mexico forge a unitization agreement with the United States. But industry experts said a deal would make sense for both sides.

Companies working in U.S. waters wouldn’t have to worry about Mexico taking legal action if it were determined that Mexican crude was ending up in their wells. International law and commercial custom dictate that communal reservoirs be shared. But the U.S. has not ratified a key United Nations treaty on maritime law, which could complicate Mexico’s effort to pursue any complaint over pilfered crude.


Nevertheless, oil companies don’t like surprises, said Michelle Foss, chief energy economist at the University of Texas at Austin’s Bureau of Economic Geology. “You’re not going to put a billion dollars at risk if . . . you might have to suspend operations because of an international dispute,” she said.

A unitization deal would give Pemex a chance to learn from deepwater veterans who have been working the gulf for decades. There is pipeline infrastructure on the U.S. side, eliminating the need for Mexico to duplicate such a costly effort.

Yet critics such as Mexican opposition leader Andres Manuel Lopez Obrador say border fields are the first step in opening Mexico’s energy sector to foreigners and privatizing Pemex. Calderon denies it.

As Mexico mulls its next move, the U.S. is hitting the gas. Its gulf crude production averages 1.3 million barrels daily and is projected to rise to as much as 2.1 million barrels a day by 2016, thanks to Perdido and other deepwater projects.


Shaped like a giant tin can, Perdido will be anchored in 8,000 feet of water, making it the deepest so-called spar in the world. The movable structure, with up to 150 workers, will tap oil at three fields, Silvertip, Tobago and Great White.

“The easy oil is gone,” said Russ Ford, Shell’s technical vice president for the Americas.

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marla.dickerson@latimes.com