A new method for correcting the abandonment pressure of gas reservoirs
The production and pressure data of gas reservoir productivity test are affected by pollution of drilling and completion,reservoir opening,imperfect perforation density and non-Darcy flow,etc.,and there are different degrees of deviation,which leads to negative or different regression coefficients of laminar flow(Darcy flow)coefficient A and turbulent flow term(non-Darcy flow)coefficient B calculated by tra-ditional binomial method.In this paper,the method of programming solution is adopted to optimize the cal-culated value of additional pressure drop on the basis of predecessors,which can make the regression coeffi-cient of binomial method closer to 1 and further improve the accuracy.The total skin additional pressure drop at any time of production is obtained by introducing the proportional coefficient m,which represents the additional pressure drop between the real skin coefficient and the additional pressure drop caused by non-Darcy flow.The revised abandonment pressure can be calculated according to the ultimate output of site en-gineering facilities and economic evaluation.Taking the production capacity test data of H gas field abroad as an example,the modified abandonment pressure and recalculated recovery efficiency obtained by this method are closer to the actual demonstrated value of the gas field,so as to improve the reliability of the cal-culation of related parameters in the subsequent gas field evaluation and development process.
gas reservoirsabandonment pressureskin coefficientadditional pressure drop
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