Study On Material Equilibrium Equation And Productivity Of Low Permeability Tight Abnormal High Pressure Condensate Gas Reservoir

This study is aimed at the Huoerguosi oil and gas field,H gas reservoir,the original formation pressure is 77.56MPa,the temperature is 76.7?,the formation pressure coefficient is 2.55,Condensate oil content is 153g/m3,the dew point pressure is 67.05MPa,and the dew pressure is about 1OMPa,belonging to the abnormal high pressure gas condensate reservoir.In this paper with the support of "Study on the high pressure gas state equation and stress sensitivity",the research can guide the problems and challenges in the process of exploitation,improve the development efficiency of the gas reservoir,and it is also significant to reduce the development risk.By using the methods of the relevant theoretical knowledge and indoor physical simulation experiment,though the results of the actual reservoir full diameter core stress sensitivity experiment and abnormal high pressure fluid physical parameters,stress sensitivity of low permeability and tight abnormal high pressure condensate gas reservoir material balance equation are established.At the same time,research on the effect of stress sensitivity on H10 wells is conducted by taking advantage of stress sensitive experiment data and field test data.The results show:(1)when the pressure is higher than the dew point,the deviation coefficient of well H10 S2 layer and S3 layer can be calculated by using XXJ formula,when the pressure is below the dew point pressure,on the whole side,for the well H10 S3 layer,PR equation in the dew point pressure,deviation coefficient(under high pressure)and other aspects has performed a good effect;for well H10 S2 layer,SRK(Peneoux-T)overall simulation accuracy shown to be higher,meanwhile it is difficult for the phase properties(dew point pressure,condensate volume etc.)and volumetric properties(deviation coefficient)to achieve very high accuracy.(2)4 pieces of full diameter core test had very strong stress sensitivity,stress sensitivity and irreversible loss of permeability ratio is between 15-30%.(3)based on the material level balance principle,together with relevant theoretical knowledge and empirical formula,the established stress sensitivity of low permeability and abnormal high pressure gas condensate reservoir material balance equation is correct.(4)The stress sensitive effect has great influence on the yield of H10 S3 well layer(capacity 18.2%lower).in the same well bottom pressure,with the increase of permeability modulus,gas yield is lower;the production pressure difference is bigger,the stress sensitive effect makes gas production more powerful.