考虑多因素的致密砂岩气藏不同井型气水产能预测新模型

针对致密砂岩气藏不同类型压裂井，根据稳定渗流理论，利用保角变换、水电相似原理，综合考虑启动压力梯度、应力敏感、气井产水等多个因素的影响，分别建立适用于致密砂岩气藏压裂直井、压裂水平井及压裂斜井的气水两相产能预测模型。实例计算及敏感性分析表明，利用本文模型预测的各类气井无阻流量与测试无阻流量值相近，证实了本文模型产能预测的有效性；压裂气井产能随着启动压力梯度、应力敏感及生产水气比的增加而降低，其中气水两相启动压力梯度对产能影响较小，实际应用时可简化处理。该方法为致密砂岩气藏的合理开发提供了一定的参考价值。

Productivity Prediction Method for Fractured Wells of Different Well Types with Multiple Factors in Tight Sandstone Gas Reservoirs

Aiming at different types of fractured wells in tight sandstone gas reservoir, a gas-water two-phase productivity prediction model for fractured vertical wells, fractured horizontal wells and fractured inclined wells in tight sandstone gas reservoir was established according to the stable seepage theory, using conformal transformation, water and electricity similarity principle, and considering the influence of starting pressure gradient, stress sensitivity and gas well water production. The case calculation and sensitivity analysis show that the open flow rate predicted by the model is close to the tested open flow rate, which proves the validity of the productivity prediction model. The productivity of fractured gas wells decreases with the increase of start-up pressure gradient, stress sensitivity and production water gas ratio. The gas-water two-phase start-up pressure gradient has little effect on productivity, which can be simplified in practical application. This method provides some reference value for the reasonable development of tight sandstone gas reservoir.