(Reuters) - Canadian oil and natural gas producer Encana Corp (>> Encana Corp) posted a quarterly profit, on an operating basis, as a steep fall in costs helped offset the impact of weak commodity prices.

Encana has responded to the 60 percent drop in crude oil prices since June 2014 by slashing jobs, cutting spending and selling oil and gas assets.

The efforts seem to be paying off. The company said on Thursday expenses fell to $600 million, from about $3.14 billion a year earlier.

The company has also downsized operations to focus on four core North American plays: the Montney and Duvernay in Western Canada, and the Eagle Ford and Permian in the United States.

Encana posted an operating profit of 4 cents per share, compared with the average analyst estimate of a loss of 4 cents, according to Thomson Reuters I/B/E/S.

Revenue fell 25 percent to $979 million, but beat analysts' expectation of $718.3 million.

Encana's oil and natural gas liquids production fell nearly 17 percent to average 117,000 barrels per day in the three months ended Sept.30, while natural gas output declined by about 14 percent to 1.33 billion cubic feet per day.

The company said on Thursday it expected to limit production decline from its core four assets to about four percent in the fourth quarter, citing "continued improvements in capital efficiency and strong operational performance."

Encana, which has cut over $3.5 billion of debt since 2014-end, said it paid back $2 billion of debt in the third quarter. The company had long-term debt of about $4.2 billion as of Sept.30.

The company has sold its Gordondale assets in Alberta to Birchcliff Energy Ltd (>> Birchcliff Energy Ltd.) for C$625 million, and its Denver Julesburg basin oil and gas assets in Colorado for $900 million.

Cash flow fell 32 percent to $252 million, from $371 million.

Encana posted a net profit of $317 million in the quarter, compared with a loss of $1.24 billion a year earlier.

The company took an impairment charge of more than $1 billion in the year-ago quarter.

(Reporting by Swetha Gopinath in Bengaluru; Editing by Sriraj Kalluvila)

Stocks treated in this article : Birchcliff Energy Ltd., Encana Corp