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Asset retirement obligation (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Asset retirement obligation details    
Asset retirement obligation, January 1 $ 2,770 $ 2,770
Acquisition of oil and gas properties 0 0
Revisions in the estimated cash flows 0 0
Liability incurred upon acquiring and drilling wells 0 0
Liability settled upon plugging and abandoning wells 0 0
Accretion of discount expense 0 0
Asset retirement obligation, December 31 $ 2,770 $ 2,770