天然气工业2026，Vol.46Issue(4)：102-112,11.DOI:10.3787/j.issn.1000-0976.2026.04.009
复杂裂缝中超低密度支撑剂运移规律及组合注入工艺研究
Experimental study on the transport performance and hybrid injection process of ultra-low-density proppant in complex fractures
摘要
Abstract
Ultra-low-density proppants have excellent transport performance,which is of great significance for improving the support effect of hydraulic fractures in unconventional reservoirs.However,they are not widely applied on site due to the unavailability of robust performance evaluation system and the absence of cost-effective implementation procedures.Based on a large,visual particle transport simulation device integrating various primary and secondary branch fractures,the transport performance of ultra-low-density proppant and quartz sand was compared.Moreover,the morphology of settled proppant bank within complex fractures was investigated under the processes of sequential hybrid injection of ultra-low-density proppant and quartz sand,and pulsed injection of ultra-low-density proppant.The following results are obtained.First,compared with quartz sand,ultra-low-density proppant is more easily carried by fracturing fluid,which can increase the proppant intake into branch fractures and improve the support length of main fracture and branch fractures,with a 17％improvement in the main fracture's support length.Second,the sequential hybrid injection of ultra-low-density proppant and quartz sand can leverage the easy transportability of ultra-low-density proppant and the easy settling of quartz sand to enhance the support length of the main and branch fractures while enabling the near-wellbore fracture filling.This process significantly reduces costs compared to the application of ultra-low-density proppant alone.Third,under the process of pulsed injection,ultra-low-density proppant exhibits a high efficiency of progressive transport.Even if the proppant settles,it can still be carried by the fracturing fluid towards the branch fractures and deeper into the fracture,increasing the filling ratio of primary branch fractures by 37.5％-73.3％.The conclusion holds that pulsed injection of ultra-low-density proppant,and hybrid injection of ultra-low-density proppant and quartz sand,are expected to be new approaches for efficient and low-cost use of ultra-low-density proppant.关键词
水力压裂/支撑剂运移/超低密度支撑剂/复杂裂缝支撑/多级分支缝/脉冲注入Key words
Hydraulic fracturing/Proppant transport/Ultra-low-density proppant/Complex fracture support/Multi-level branch fracture/Pulsed injection分类
能源科技引用本文复制引用
吕明锟,郭天魁,陈铭,崔付义,刘拥赞,曲占庆..复杂裂缝中超低密度支撑剂运移规律及组合注入工艺研究[J].天然气工业,2026,46(4):102-112,11.基金项目
国家自然科学基金面上项目"深部储层压裂缝内暂堵剂体系构筑与运移-封堵-造缝机理研究"(编号:52474069)、山东省自然科学基金杰出青年基金项目"储层压裂改造理论与技术"(编号:ZR2024JQ012). （编号:52474069）
