By Dan Molinski 

CEDEÑO, Colombia--The recent blast was routine: Marxist rebels detonated dynamite remotely by cellphone along the Caño Limon oil pipeline, scorching the jungle as it blew up its target.

And once again, an economic lifeline for Colombia--a 480-mile pipeline that can carry 220,000 barrels of crude a day to a Caribbean port--closed for repairs.

"The guerrillas gave us advanced notice, so I sent the kids home a bit early," said Melida Wilches, a teacher at a school adjacent to pipeline mile-marker 79, where the blast occurred.

Over the last two years, attacks by rebels against Colombian pipelines have punctured a hole in the progress and the self-assuredness of one of Latin America's most dynamic economies and raised questions about the outlook for Colombia as a reliable provider of crude to the U.S.

Following a boom by a sector that President Juan Manuel Santos had called an economic locomotive--when oil production doubled to 1 million barrels a day--the sector contracted by 2.2% in the second quarter, even as Colombia's GPD rose 4.3%.

Oil investment, at $2.8 billion through June, was the lowest for that half-year period since 2011. An oil auction in July lured commitments of $1.4 billion, just more than half of what the government had intended.

To be sure, part of Colombia's woes can be traced to lower global oil prices, the U.S. fracking boom, which has dampened energy investment across Latin America, and bureaucratic delays in Colombia for granting drilling rights, say oil executives and government officials. Still, rising rebel attacks are a main factor in the falling production and energy companies' reluctance to invest here, these people say.

"There's a pessimism that wasn't there before among companies in Colombia, an increasing risk perception," said Lisa Viscidi, an energy analyst at the Washington-based policy group, Inter-American Dialogue.

The situation has become so delicate for the government that Mr. Santos publicly said in late July that continued attacks by the Revolutionary Armed Forces of Colombia, or FARC, could jeopardize ongoing peace talks aimed at ending a half century of conflict with that main rebel group.

"You're playing with fire," he warned the rebels in a speech.

Jaime Bocanegra, who oversees state-oil company Ecopetrol's network of pipelines, said the attacks were a "hard blow to the national economy," which depends on oil for half of export revenue. The strikes have resulted in Ecopetrol producing nearly 30,000 fewer barrels a day through August, the equivalent of $3 million daily. "All this means fewer royalties," he said.

Such attacks were believed to be in the past after Colombia's military had weakened the guerrillas over a several-year period.

Here in the sparsely-populated eastern plains where the Caño Limon pipeline lies, Colombian counter-guerrilla troops trained by U.S. Special Forces soldiers from Fort Bragg, N.C., were able to lower the number of bombings from 170 in 2001 to just 37 a year between 2007 and 2010.

The improvements, though, proved fleeting, as the attacks rose over the next three years. Neither the Farc nor the second main guerilla group, the National Liberation Army, could be reached for comment on their motivation for the attacks.

But Major General Germán Eudoro Velasco, who commands a unit that protects one of Caño Limon's most dangerous stretches, said the FARC's commanders want to bolster their bargaining power at the peace talks by demonstrating military strength.

Jorge Enrique Bedoya, Colombia's deputy defense minister, said 90% of the country is free of rebels. But hundreds of miles of pipelines where the rebels still retain a foothold, like the far south or here in the east, are easy targets.

"We could be standing shoulder-to-shoulder along the pipeline, and the attacks would still be tough to stop," said one soldier, an automatic rifle at his side, as he patrolled along Caño Limon on a recent day.

The rebels are projecting strength "without hurting public sentiment in the way attacks on innocent civilians would do," said former President Andrés Pastrana, whose administration in 1998 created the special battalions still in use today that are trained to protect energy infrastructure.

In 2013, pipeline bombings totaled 259. The pace of attacks have dipped this year but still average one every three days through August, according to the Defense Ministry. Nonetheless, their cost has risen.

Francisco Lloreda, president of the Colombian Oil Association, an industry group representing Exxon Mobil Corp. and other foreign firms here, said rebel attacks this year have cost the sector $522 million in lost oil production compared with $350 million in all of last year.

A new $1.6 billion pipeline, the Bicentennial, completed last year and slated to carry 110,000 barrels a day through what officials said would be virtually impenetrable cement, hasn't been spared. It was shut 174 days through the first eight months of this year, mostly because of rebel violence, Ecopetrol officials say.

The attacks are giving ammunition to the government's critics, who charge that the president has softened security strategies to advance talks with the FARC.

"As the peace process drags on, the armed forces are no longer attacking the guerrillas like before," said Alfredo Rangel, an opposition senator.

The government denies it has softened security. Ecopetrol said that thousands of troops are being deployed, with at least 100 rebel strikes thwarted this year.

"We're not sitting here with our arms crossed," Finance Minister Mauricio Cardenas told reporters recently.

Companies that are already well-entrenched in Colombia say they remain confident of long-term prospects, including Los Angeles-based Occidental Petroleum Corp., which provides most of the oil used by the Caño Limon pipeline.

"We believe there are ample opportunities in the country for future investment," said Robert Palmer, president of the company's local unit.

But with investments sagging, Mr. Lloreda said the search for new oil deposits has become tougher. Reserves now stand at 2.4 billion barrels, which the government says is enough to last less than seven years at current extraction levels. Mr. Lloreda said the country needs to drill 230 wells a year to boost reserves, but only 71 had been perforated through late August.

"The current level of reserves no longer guarantees our country's energy self-sufficiency." Mr. Lloreda said. "We could lose it and that would be grave. It would mean importing oil."

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