体积压裂是一种通过充分破碎致密页岩岩体,在储层中制造具备有效渗流能力的改造体积,实现页岩气经济开发的改造工艺。现场可通过压裂过程中的实时微地震监测或压后停泵压降测试,对体积压裂改造效果进行分析和评价。事实上,实时微地震监测受到传感器位置、噪声点等因素影响,对压裂裂缝特征描述可能失真;停泵压降测试往往受到测试时间限制,解释范围较有限。通过试井手段对体积压裂后页岩气井生产过程中流量和压力测试数据进行分析,为改造效果评价和产能预测提供更详细、准确的参数。与常规压裂不同,体积压裂以高排量、流体切换、缝内转向等工艺手段克服地层脆性及应力条件的限制,制造形态复杂的空间裂缝网络,其渗流特征与面源缝大不相同,更近于以射孔孔眼或近井地带一定范围内主裂缝通道为中心点源流动,从试井动态上是径向或拟径向流特征,而非线性流。利用较短的主裂缝长度和高于页岩基质若干数量级的有效渗透率,对改造体积进行描述,对于评价体积压裂效果和产能预测更具有实际意义。本文通过对四川威远页岩气井压后生产的测试数据进行试井分析,给出了了典型的页岩气井体积压裂后的渗流特征,并利用试井解释建模,进行历史拟合和长期产能预测。 Volumetric fracturing is a kind of reformation process that can realize the economic development of shale gas by fully crushing the dense shale rock mass and making the volume of reformation with effective seepage capacity in the reservoir. The site can be through the fracturing process of real-time microseismic monitoring or pressure drop test stop pumping, the effect of volumetric fracturing transformation analysis and evaluation. In fact, the real-time microseismic monitoring is affected by the sensor position, noise point and other factors, which may distort the characterization of fracturing fractures. The stop-pump pressure drop test is usually limited by the test time, and the explanation range is limited. Through the well testing method, the flow and pressure test data in the production process of shale gas wells after volumetric fracturing are analyzed to provide more detailed and accurate parameters for the evaluation of transformation effects and capacity prediction. Different from conventional fracturing, volumetric fracturing can overcome the limitation of formation brittleness and stress conditions by high displacement, fluid switching, seam steering and other techniques to create complex space fractures, whose seepage features are greatly different from those of surface source fractures , Which is closer to the source of the main fracture channel within a certain range of perforation or near wellbore. It is radial or quasi-radial flow characteristics but not linear flow from well testing. Describing the reconstruction volume with shorter main-fracture length and higher-order effective permeability than the shale matrix is ​​more practical for evaluating the volumetric fracturing effect and capacity prediction. In this paper, through the well test analysis of the production data of shale gas well in Weiyuan, Sichuan, the seepage characteristics of a typical shale gas well after volumetric fracturing are given, and the history interpretation and modeling Long-term capacity forecast.