In the process of offshore gas well productivity testing,due to the influence of short production time and low permeability of the reservoir,it is often difficult to reach a stable state of flow pressure at the bottom of the well,which results in large errors in the productivity evaluation and even abnormalities in the production capacity equations.In order to effectively eliminate this kind of influence,based on the theory of seepage flow in test wells,and the analysis of the influence law of the testing system on productivity,this paper establishes a productivity evaluation method for flow pressure correction based on the analysis results of unstable test wells.A case study was applied to well A-1 of a low-permeability gas reservoir in the Bohai Sea.The results showed that the relative error of open flow of gas wells calculated before and after correction reached 8.35%,and the corrected results were closer to the actual production data after production,confirming that this method can help to improve the accuracy of gas well productivity evaluation results and better guide the reasonable production allocation.
gas well productivityflowing pressure correctiontesting systemsuperposition principleopen flow
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