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Asset retirement obligation (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Asset retirement obligations    
Asset retirement obligation, January 1 $ 2,770fil_AssetRetirementObligationJanuary1 $ 2,770fil_AssetRetirementObligationJanuary1
Acquisition of oil and gas properties 0fil_AcquisitionOfOilAndGasProperties 0fil_AcquisitionOfOilAndGasProperties
Revisions in the estimated cash flows 0fil_RevisionsInTheEstimatedCashFlows 0fil_RevisionsInTheEstimatedCashFlows
Liability incurred upon acquiring and drilling wells 0fil_LiabilityIncurredUponAcquiringAndDrillingWells 0fil_LiabilityIncurredUponAcquiringAndDrillingWells
Liability settled upon plugging and abandoning wells 0fil_LiabilitySettledUponPluggingAndAbandoningWells 0fil_LiabilitySettledUponPluggingAndAbandoningWells
Accretion of discount expense 0fil_AccretionOfDiscountExpense 0fil_AccretionOfDiscountExpense
Asset retirement obligation, December 31 $ 2,770fil_AssetRetirementObligationDecember31 $ 2,770fil_AssetRetirementObligationDecember31