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多段压裂水平井模拟过程中大多采用与实际不符的恒定缝宽假设,压裂井产能预测结果不精确。利用商业数值模拟软件,对裂缝形态进行了近似实际的描述。采用楔形裂缝的等效形式和等导流能力方法,分析了启动压力梯度和介质变形对多段压裂水平井产能的影响,并且对比了楔形裂缝和矩形裂缝多段压裂水平井的产量。结果表明:在其他条件一样的情况下,多段压裂水平井产量随着启动压力梯度增大和介质变形程度增强而降低;且楔形裂缝多段压裂水平井产量比矩形裂缝多段压裂水平井产量低,二者相对误差随着启动压力梯度增大呈现先增大后降低的趋势,随着介质变形程度的降低呈现逐渐降低的趋势,但总体上相差幅度不大。该研究方法为多段压裂水平井产能准确预测及裂缝参数优化提供了借鉴。
Multi-section fracturing horizontal wells are mostly used in the simulation process is not consistent with the actual constant width of the assumption, fracturing well productivity prediction results are not accurate. Using commercial numerical simulation software, an approximate description of fracture morphology is made. Based on the equivalent form of wedge fracture and equivalent flow conductivity method, the influence of start-up pressure gradient and medium deformation on productivity of multi-fractured horizontal well was analyzed. The production of multi-fractured horizontal well with wedge fracture and rectangular fracture was compared. The results show that under the same conditions, the productivity of multi-fractured horizontal wells decreases with the increase of starting pressure gradient and the degree of medium deformation. Moreover, the production of multi-fractured horizontal wedges with fractures is lower than that of multi-fractured horizontal fractures with rectangular fractures , The relative error of the two increases first and then decreases with the increase of starting pressure gradient, and gradually decreases with the decrease of the medium deformation, but the overall difference is not large. The research method can provide reference for the accurate prediction of productivity of multi-section fractured horizontal wells and optimization of fracture parameters.