ConocoPhillips (COP) unveiled Wednesday plans to sell an additional $5 billion to $10 billion in non-core assets over the next two years as the oil producer and refiner continues efforts to improve its balance sheet.

The move, announced at the company's analyst meeting in
New York , had been expected by some analysts. The Houston-based company said it expects to sell a total of $12 billion to $17 billion in assets from 2010 to 2013, including at least $1 billion in refining and marketing properties this year.

Conoco said potential new dispositions include a 15% stake in the Australia-Pacific liquefied natural gas project, a joint venture with Origin Energy Ltd. (ORG.AU), non-strategic assets in the
North Sea and additional mature assets in the U.S. and Canada .

"We are executing the plan set out last year to improve returns and create value through disciplined capital spending, non-core asset sales and growing production per share," said Chief Executive Jim Mulva.

ConocoPhillips said it expects to use proceeds from the asset sales announced Wednesday to fund a $10 billion share buyback program it had previously unveiled, and for capital investment. In a slide presentation, the company said it expects share buybacks to total $11 billion this year and in 2012.

The asset sales mark a shift from Conoco's debt-fueled acquisition spree when commodity prices were soaring.

ConocoPhillips, the third-largest
U.S. oil company by market value after Exxon Mobil Corp. (XOM) and Chevron Corp. (CVX), said it expects its oil-and-gas production to be between 1.6 million and 1.7 million barrels of oil equivalent in 2013, down from 1.75 million barrels of oil equivalent produced last year due to the impact of the asset sale program. The oil giant, however, said it expects output to grow 2% to 3% per year in the long term, driven mainly by the startup of projects in Asia , the North Sea and the U.S.

The company plans $13.5 billion of capital spending this year, with the vast majority targeted for exploration and development. It said it plans to invest $14 billion to $15 billion per year from 2012 to 2015. Conoco plans to invest 50% more this year in projects in
North America .

The company said it sees oil prices remaining strong in the long term, driven by increased global demand, but added that natural gas prices in the
U.S. are likely to remain depressed due the shale gas production boom.

The company said it plans to invest $1.4 billion in the APLNG project, and that it will be sanctioned by mid-year and have its first liquid natural gas delivery in 2015.

Conoco in January reported that its fourth-quarter profit rose 60% on high oil prices and improved refining margins.

Conoco's shares were trading at $77.30, up a fraction.