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水平井分段完井应用前景广阔,但国内外相关研究均是以油藏为基础。根据气体稳定渗流理论及水平井三维渗流特征,通过引入流量相关表皮系数推导出了气体非达西渗流影响下微元水平段的拟压力分布,进而基于拟压力降叠加原理建立了水平井分段完井气藏模型;再结合分段完井井筒模型建立了其产能预测耦合模型。实例验证表明耦合模型准确度高;继而对气藏水平井分段完井产能进行了预测,并给出了相应流率、轴向流量及井筒流压沿井筒方向的分布。
The application of horizontal well section completion is promising, but the relevant research both at home and abroad are based on the reservoir. According to the theory of gas seepage stability and the three-dimensional seepage characteristics of horizontal well, the pseudo-pressure distribution of the micro-element horizontal section under the influence of non-Darcy seepage of gas is deduced by introducing the flow-related skin factor, and then the horizontal well section is established based on the principle of pseudo- Complete gas reservoir model; combined with the sectional wellbore model to establish its production capacity prediction coupling model. The example verification shows that the coupled model is of high accuracy. Then the prediction of the partial well completion productivity of horizontal wells in gas reservoirs is made and the corresponding flow rates, axial flow rates and wellbore pressure distribution along the wellbore direction are given.