煤层气井生产曲线的拟合和产量预测

The Fitting of the Coalbed Methane Production Curve and its Output Estimate

本文根据煤层气井的储层参数和水文地质数据,通过计算排采在煤层中形成的压力降, 再结合兰氏方程、临界解吸压力等参数,进一步计算出煤层气井的产水量和产气量,并与实际的 生产曲线相比较,进行拟合校正,建立合理的预测模型,用于煤层气并未来的产水量和产气量的 预测。该方法回避了以往数值模拟的解吸、扩散、气水两相流运移的复杂计算。

Based on storage parameters of coalbed methane wells and hydro geological data, this paper first calculates the pressure decrease in the coal seam after the drainage and then gets the water output and methane output from wells by integrating parameters such as Lan' s formula and critical desorption pressure. The result will be used to compare with the actual production curve for curve fitting and establishment of reasonable estimating model, which will be used to predict the future output of water and methane in the coalbed methane well. It avoids complicate calculations in the data simulation of desorption, difusion and vapour/water movement in the traditional methods.