产量递减自动拟合方法的适用条件研究

在产量递减自动拟合模型（简称LM模型）的基础上，结合数值模拟研究了LM模型在正常压力气藏气井产量递减分析中的适用条件。研究表明，LM模型可用于任何边界形状气藏气井的产量递减分析，但对于低渗气藏的计算结果偏差很大。为了改善LM模型的预测精度，提出了去掉不稳定生产数据后，再用LM模型反求地层参数。为了便于实际应用中得到正确的计算结果，提出了检验计算结果正确与否的检验标准。

THE APPLICABILITY OF RATE DECLINE AUTOMATIC MATCHING METHOD

Based on rate decline automatic matching model(LM model in short) and combined with the singlewell numerical simulator, the applicability of LM's automatic matching model on analyzing the gaswell decline of the normal pressure gas reservoir is investigated. The research shows that the LM model can be applied to analyze the gaswell rate decline for any boundaryshape gas reservoir, however, as for the lowpermeability gas reservoir, the calculation results take on great errors. To improve LM model predication accuracy, a way of acquiring the formation parameters is presented in the paper by firstly removing the unsteady production data and then, following the LM automatic matching model to get formation parameters. Besides,the authors put forward a touchstone to justify the calculation results.