Quantitative Evaluation of Productivity Zoning in Tight Gas Fields
Tight gas is difficult to develop due to the characteristics of low pressure,low permeabili-ty and strong heterogeneity.To develop tight gas field more economically and effectively,the strategy of rolling development is often adopted,which is fat first and lean later.Therefore,it is necessary to divide the production capacity of tight gas field.At present,geological multi factor qualitative analy-sis method and energy storage coefficient method are commonly used in productivity favorable zoning of tight gas field.The geological multi factor analysis method has strong subjectivity and can only do qualitative analysis;while the energy storage coefficient method can do quantitative analysis,but it ignores the effect of tight gas reservoir permeability,only reflects the enrichment degree of reservoir gas,and can't truly reflect the productivity.Taking reservoir permeability into consideration,this paper puts forward the concept of comprehensive productivity coefficient QI(KhφSg),establishes the relationship between comprehensive productivity coefficient and open flow rate of gas well;based on economic limit open flow rate,productivity evaluation standard is put forward to divide tight gas field into production zones,and find out the real meaning of available desserts.The study provides favorable guidance for gas field well location deployment.
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