低渗气藏水平井不同完井方式产能预测研究

Productivity prediction of a horizontal gas well in low-permeability gas reservoir under different well completion forms

根据气藏内气体的流动模型和水平井筒内流体的流动模型,建立了气藏-水平井筒流体流动的耦合模型,该模型充分考虑了气藏内的各向异性和气体的非达西流动.利用拟压力采用非稳态方法求解气藏水平井的产能模型,预测了裸眼完井、射孔完井和压裂完井的水平井气井产能,分析了影响产能的因素,并将其与直井压裂的产能进行了对比.

Based on the gas flow model in gas reservoir and the fluid flow model in horizontal wellbore, the coupled model of gas flow in gas reservoir horizontal wellbore is established for predicting the productivity of a horizontal gas well. The anisotropy of gas reservoir and the non Darcy flow of gas are considered in the coupled model. The model is solved by using pseudopressure. The productivity of a horizontal gas well is predicted under open hole completion, perforation completion and fracturing completion separately, and the factors of influencing the productivity are analyzed. The productivity of a horizontal gas well under different well completion forms separately is compared with the productivity of a vertical gas well under fracturing completion, and it is shown that under the three well completion forms, the former is all greater than the latter. In initial stage, the former is about 4 times as much as the latter under open hole completion and perforation and 7 times under fracturing completion; after three years, the former is 2 times as much as the latter under open hole completion and perforation completion and 4 times under fracturing completion.