A new method for evaluating the driving energy of gas cap reservoirs via calculation of average formation pressure based on the production performance data
In view of the problem of the existing driving index analysis methods,which requires relatively complete bottom pressure detection data and cannot calulate the driving index when the formation pressure history is not clear,this study proposes a new strat-egy to use partial production performance data to calculate relevant parameters through an improved material balance method,in the case of not shutting down the well and affecting the production,and to calculate the complete average formation pressure history by driving a formula.Then,based on the average formation pressure obtained by this method,the driving energy and driving index could be calculated.Compared with two sets of actual field data,the average relative errors by calculation were 1.28%and 1.07%,respectively,proving the effectiveness of this method.The research results can guide the design and subsequent optimization of oil reservoir development.
gas cap reservoirmaterial balance equationaverage formation pressuredriving energyproduction dynamic data
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