Chesapeake Energy Corp. agreed to sell a stake in an oil and natural-gas field to China's Sinopec for $1 billion, as the U.S. company tries to plug a gap in its cash flow. Investors punished Chesapeake after it fulfilled a nearly yearlong quest to sell at least a stake in its Mississippi Lime acres, which straddle the Oklahoma and Kansas border, saying the company cut too deep a discount in its asking price. Chesapeake shares declined 6.8%, or $1.39, to $19.11 at 4 p.m. Monday in composite trading on the New York Stock Exchange
Chesapeake Energy Corp. agreed to sell a stake in an oil and natural-gas field to China's Sinopec for $1 billion, as the U.S. company tries to plug a gap in its cash flow.

Investors punished Chesapeake after it fulfilled a nearly yearlong quest to sell at least a stake in its Mississippi Lime acres, which straddle the Oklahoma and Kansas border, saying the company cut too deep a discount in its asking price. Chesapeake shares declined 6.8%, or $1.39, to $19.11 at 4 p.m. Monday in composite trading on the New York Stock Exchange.

Chesapeake is still reeling from a collapse in U.S. natural-gas prices, while it attempts an expensive shift to more profitable oil drilling. The second-largest natural-gas producer in the U.S., after Exxon Mobil Corp., is selling assets to address an expected $4 billion funding shortfall.

The Sinopec deal also would increase state-owned Chinese oil and gas producers' rapidly expanding foothold in the North American oil patch. Sinopec, known formally as Sinopec International Petroleum Exploration & Production Corp., entered a $2.5 billion joint venture with Devon Energy Corp. in January 2012 to drill in the Mississippi Lime. Cnooc Ltd., meanwhile, just concluded a $15 billion takeover of Canada's Nexen Energy in the largest overseas acquisition by a Chinese state-owned energy company. In 2010 and 2011, Cnooc bought stakes in Chesapeake's oil-rich shale fields in south Texas, as well as fields in Colorado and Wyoming.

The latest deal "moves us further along in achieving our asset-sales goals and secures an excellent partner to share the capital costs required" to develop this large area, said Chesapeake's chief operating officer, Steven C. Dixon.

Chesapeake and other natural-gas producers have been hurt by a glut of the resource that stems from their use of hydraulic fracturing, or fracking, to unlock gas from shale formations. The resulting production surge caused prices to collapse to a 10-year low, below $2 a million British thermal units last April. Chesapeake posted shrinking revenue and chose to sell more than $10 billion in assets last year to improve its balance sheet.

Chesapeake Chief Executive Aubrey McClendon said in November that the company marketed its Mississippi Lime acres for most of 2012 to Asian energy companies, but added at the time that reaching a potential deal "became more complicated" as regulators increased scrutiny of foreign companies trying to invest in U.S. energy assets.

The stamp of approval that the Canadian and U.S. governments recently gave to Cnooc's $15 billion takeover of Nexen might have calmed those fears, said China energy analyst Robert Gee, head of Gee Strategies Group LLC.

"The Nexen deal was obviously critical in communicating a signal -- it gave a green light" for Chinese investment in exploration and production in the U.S. and Canada, he said.

Chesapeake's deal with Sinopec would give the Chinese company a 50% interest in 850,000 of Chesapeake's net oil and natural-gas leasehold acres in the Mississippi Lime. Chesapeake will receive about 90% of proceeds upon the deal's close, expected in the second quarter, with the remainder to be paid later.

The Mississippi Lime has been a target for companies using fracking techniques in search of oil, but so far there has been only moderate success. Chesapeake said it averaged 34,000 barrels a day of oil and natural gas in its Mississippi Lime wells in the fourth quarter.

Analysts applauded Chesapeake for landing the deal with Sinopec. But they also voiced concern that the company's need to sell helped undercut the final price tag by as much as $200 million.