BUENOS AIRES--Argentine President Cristina Kirchner pledged on Wednesday to double down on her government's economic program and push ahead with plans to increase oil and gas production.

In her first public speech since having surgery to remove a blood clot near her brain about six weeks ago, Mrs. Kirchner said the government would "deepen" its economic policies and do whatever is required to become energy self-sufficient again.

"The goal is to recovery our energy sovereignty," Mrs. Kirchner told a boisterous group of young political activists gathered just outside her office. "We're going to partner with whomever we need to under the terms that are most favorable to our country."

Mrs. Kirchner was referring to efforts by the state-run oil company YPF SA (YPF) to partner with major international energy companies to revitalize Argentina's ailing energy industry.

Oil and gas production has plummeted over the past decade, turning the country into a net energy importer to the detriment of the government's finances. Argentina's imported fuel bill is increasing about 25% a year and the country is on track to spend around $12 billion this year alone on energy imports, according to official data.

Mrs. Kirchner has been searching for outside energy investment since she expropriated a 51% stake in YPF last year from the Spanish oil company Repsol SA (REP.MC). Mrs. Kirchner said the takeover was necessary to reverse falling oil and gas output. Repsol disputes those claims and is suing Argentina for $10.5 billion in compensation.

YPF recently partnered with Chevron Corp. (CVX) in a $1.5 billion deal to produce shale oil and gas. Some analysts hailed the deal as a key step toward unlocking Argentina's vast unconventional energy resources. Critics say the Kirchner administration handed Argentina's energy sovereignty over to a foreign company.

"We know this demands capital that is either not in Argentina or is somewhere else and they don't want to put it here. I'm confident people will understand that need we have to recover our energy sovereignty," she said.

Mrs. Kirchner spoke to the crowd after swearing in new members of her cabinet. After dressing in black for the past three years in mourning for the death of her husband and predecessor, Nestor Kirchner, she addressed the crowd in a dark but colorful skirt.

Earlier this week, she purged her economic team and named a new chief of staff in the biggest cabinet shakeup in years. The changes come as the administration struggles with a sluggish economy, doubts about the president's health, and a succession struggle in the ruling Peronist movement two years before Mrs. Kirchner is scheduled to step down.

Mrs. Kirchner's promotion of Axel Kicillof to Economy Minister from the No. 2 job at the ministry will likely put an end to the Balkanization of economic policy-making that has characterized her government.

Until now, outgoing Economy Minister Hernan Lorenzino, Mr. Kicillof, and Guillermo Moreno, who enforced price controls and foreign trade policies, had competed with each other for the president's ear. Central bank president Mercedes Marco del Pont frequently clashed with some members of the economic team over how to address inflation, which economists say totals around 25% annually.

The exit of Mr. Lorenzino, Mr. Moreno and Mrs. Marco del Pont clears the way for Mr. Kicillof to assume full responsibility for running the economy without distracting power struggles within the ministry.

A student of Marxist and Keynesian economic theory, Mr. Kicillof is an outspoken supporter of a significant state presence in the economy. He is widely credited with engineering Mrs. Kirchner's expropriation of YPF.

Mr. Kicillof will have little time to ease into his new role as Argentina suffers fatigue from more than a decade of populist economic policies initiated by Mr. Kirchner when he took office in 2003.

Many economists say that inflation has been running at or above 20% for almost four years due in large part to rampant government spending financed in part by the printing of money. Argentina also faces declining foreign currency reserves that have led the government to ration U.S. dollars to businesses and the public. Reserves settled at $31.9 billion Wednesday, a drop of more than 25% since the end of last year.

Analysts expect the administration to expand currency controls and import restrictions in the coming weeks to staunch the bleeding.

"It should become an increasingly active debate on how officials will honor the hefty U.S. dollar liabilities with scarce foreign exchange reserves," Siobhan Morden, head of Latin America strategy at Jeffries, said in a note.

Write to Ken Parks at ken.parks@wsj.com and Taos Turner at taos.turner@wsj.com

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