Research on the evaluation method for CO2 structural storage capacity in condensate gas reservoirs
The complex phase behavior changes in condensate gas reservoirs make it difficult to evaluate CO2 storage potential.In order to improve the calculation accuracy of CO2 tectonic storage capacity of condensate gas reservoir,based on the principle of conservation of mole,considering the mixing of injected CO2 and condensate gas,retrograde condensate,rock and bound water deformation,the general formula of material balance in production stage and CO2 storage stage of condensate gas reservoir is derived,and the CO2 tectonic storage capacity evaluation method is established.The results show that the CO2 tectonic storage capacity cal-culated by this method is in good agreement with the numerical simulation results,and the error is less than 6.42％.If the variation of deviation factor is ignored,the calculation result of CO2 tectonic storage capacity is too large,and the error reaches 18.61％.If the variation of retrograde condensate is ignored,the calculation result of tectonic storage capacity is too small,and the error is as high as 9.93％at the low storage pressure.This method is of great significance for CO2 tectonic storage capacity assessment and CO2 storage optimization in condensate gas reservoirs.
condensate gas reservoirCO2 tectonic storage capacitymaterial balancestorage potential assessment
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