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本文针对目前制约页岩气经济有效开发的裂缝破裂延伸机理及导流特性进行了综合分析,并着重就单裂缝及多簇裂缝同步起裂延伸机制进行了阐述,对套管和施工参数对裂缝起裂扩展的影响进行了分析.在此基础上,对单一裂缝及复杂裂缝导流能力的多因素影响机制进行了研究.并结合现场实施的可能性,对复杂裂缝内支撑剂的动态输送规律及支撑剂通过转向裂缝的运移规律进行了模拟分析,得出了规律性的认识,可由此指导现场压裂设计参数优化,进而达到提高最终有效裂缝改造体积(Effective Stimulated Reservoir Volume,ESRV)的目标.最后针对深层页岩气的特点,指出了下步深化研究的方向,如“井工厂”多井多缝条件下的裂缝破裂延伸机制及岩石自支撑高导流裂缝机制等,这些对经济有效开发国内的深层页岩气,都具有重要的指导作用.
In this paper, a comprehensive analysis is made on the crack propagation mechanism and diversion characteristics that restrict the economical and effective development of shale gas. The mechanism of simultaneous initiation and propagation of single fractures and multi-cluster fractures is emphatically described. The influences of casing and construction parameters on fracture Based on the analysis, the multi-factor influencing mechanism of single crack and complicated crack diversion ability was studied.According to the possibility of on-site implementation, the dynamic transport of proppant in complex fracture And proppant are analyzed by the law of the migration of steering fractures, and regularity is gained, which can guide the optimization of on-site fracturing design parameters and further improve the Effective Stimulated Reservoir Volume (ESRV) Target.Finally, according to the characteristics of deep shale gas, the direction of further study is pointed out, such as the crack propagation and extension mechanism under multi-well and multi-well conditions and the high self-supporting crack propagation mechanism It plays an important guiding role in the economical and effective development of deep shale gas in China.