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OA
Experimental study on the transport performance and hybrid injection process of ultra-low-density proppant in complex fractures
超低密度支撑剂优异的运移性能对提高非常规油气藏水力压裂缝网的支撑效果具有重要意义,但受制于性能评价体系不完善、缺乏低成本应用方法等因素,现场应用尚不普遍.为此,基于具有多种一级分支缝和二级分支缝的大型可视化颗粒运移模拟装置,对比了超低密度支撑剂与石英砂的运移性能差距,研究了超低密度支撑剂与石英砂先后组合注入、脉冲注入对复杂缝内砂堤形态的影响.研究结果表明:①与石英砂相比,超低密度支撑剂更易被压裂液携带,可增加分支缝的进砂量,提高主裂缝和分支缝的支撑长度,主缝支撑长度提高17％;②超低密度支撑剂与石英砂先后组合注入,可发挥超低密度支撑剂易运移、石英砂易沉降的特点,提高主缝和分支缝的支撑长度并兼顾近井裂缝充填,与全程使用超低密度支撑剂相比,可极大降低成本;③脉冲注入时,超低密度支撑剂滚流输送效率高,即使发生沉降也能被压裂液携带向裂缝深部和分支缝推移,可将一级分支缝充填比例提升37.5％～73.3％.结论认为,脉冲注入超低密度支撑剂、与石英砂组合使用有望成为超低密度支撑剂高效低成本应用的新思路.
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.
吕明锟;郭天魁;陈铭;崔付义;刘拥赞;曲占庆
深层油气全国重点实验室[中国石油大学(华东)]深层油气全国重点实验室[中国石油大学(华东)]||中国石油大学(华东)石油工程学院中国石油大学(华东)石油工程学院阳泉市长青石油压裂支撑剂有限公司深层油气全国重点实验室[中国石油大学(华东)]||中国石油大学(华东)石油工程学院中国石油大学(华东)石油工程学院
能源科技
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
Hydraulic fracturingProppant transportUltra-low-density proppantComplex fracture supportMulti-level branch fracturePulsed injection
《天然气工业》 2026 (4)
102-112,11
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).
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