* Posts Q3 net loss on $1.07 bln writedown charge
* To spend $150 mln more than planned on Permian basin in Q4
* Q3 oil and gas-liquids output up 35 pct (Adds comment, Deep Panuke details)
By Nia Williams
CALGARY, Alberta, Nov 12 (Reuters) - Canadian oil and natural gas producer Encana Corp reported a quarterly loss on Thursday but reported an increase in oil production and said it is speeding up spending in the Permian basin in Texas.
Encana plans to spend an extra $150 million in the Permian shale field in the current quarter that was originally earmarked for 2016. The company expects total capital spending of $2.2 billion this year, the upper end of its earlier forecast.
Even so, Encana is continuing to clamp down on costs as the oil price slump drags on.
"I'm very confident our efficiencies will be even better next year than this year. We'll build off the operating performance we've achieved," said chief executive Doug Suttles.
Encana has cut its workforce by 40 percent since the end of 2012 and Permian horizontal drilling and completion costs are down about $2 million per well this year.
It has been restructuring its portfolio to diversify production away from low-value natural gas towards oil and expects asset divestitures to total $2.8 billion in 2015.
In August, Encana sold its Haynesville natural gas assets in northern Louisiana for $850 million and said in October it would sell its Denver Julesburg basin oil and gas assets in Colorado for $900 million.
The Calgary-based company has booked impairment charges of $3.62 billion so far this year, including $1.07 billion in the third quarter, to write down the value of assets amid a prolonged slump in global crude prices.
Encana's oil and gas-liquids production rose to average 140,400 barrels per day in the third quarter, 35 percent higher than a year earlier. However, natural gas output fell 30 percent to 1.55 billion cubic feet per day.
In the last two weeks Encana restarted its Deep Panuke platform offshore Atlantic Canada, which shut down in May because of excess water in its natural gas reservoir.
Suttles also said Encana's next well in the Duvernay oil and gas formation in Alberta would be deferred until the Alberta government completes reviews into royalty rates and climate change policies.
Encana reported a third-quarter net loss of $1.24 billion, compared with a profit of $2.81 billion a year earlier.
Its operating loss, which excludes most one-time items, was $24 million, or 3 cents per share against a year-earlier profit of $281 million, or 38 cents per share.
Encana shares were up 1.6 percent at C$10.05 on the Toronto Stock Exchange.
(Additional reporting by Amrutha Gayathri in Bengaluru; Editing by Savio D'Souza and W Simon)