摘要
引入体视粒子图像测速技术,开展支撑剂平面三维速度场测试,研究“垂直主裂缝-垂直分支缝”90°相交的裂缝模式下分支缝的支撑剂入缝过程,分析泵注排量、压裂液黏度、支撑剂粒径、裂缝宽度对支撑剂进入分支缝运动特征的影响。研究表明:依据主缝中支撑剂偏转特征可将主裂缝划分为入缝前过渡区、入缝前稳定区、缝口转向入缝区、回吸入缝区、远离缝口区5个区域,支撑剂主要在分支缝口处转向进入分支缝,少量支撑剂在缝口后部回吸进入分支缝。增大泵注排量、减小支撑剂粒径、增大支缝宽度有利于支撑剂转向进入分支缝;增大压裂液黏度,支撑剂进入支缝能力先增强后减弱,高黏不利于支撑剂进入分支缝。现场施工时,初期可采用大排量、微—小粒径支撑剂,确保分支缝有效铺置,后期采用中—大粒径支撑剂,确保主缝有效铺置,提高缝网整体导流能力。
Particle image velocimetry technology was employed to investigate the planar three-dimensional velocity field and the process of proppant entry into branch fractures in a fracture configuration of“vertical main fracture-vertical branch fracture”intersecting at a 90°angle.This study analyzed the effects of pumping rate,fracturing fluid viscosity,proppant particle size,and fracture width on the transport behavior of proppant into branch fractures.Based on the deflection behavior of proppant,the main fractures can be divided into five regions:pre-entry transition,pre-entry stabilization,deflection entry at the fracture mouth,rear absorption entry,and movement away from the fracture mouth.Proppant primarily deflects into the branch fracture at the fracture mouth,with a small portion drawn in from the rear of the intersection.Increasing the pumping rate,reducing the proppant particle size,and widening the branch fracture are conducive to promoting proppant deflection into the branch.With increasing fracturing fluid viscosity,the ability of proppant to enter the branch fracture first improves and then declines,indicating that excessively high viscosity is unfavorable for proppant entry into the branch.During field operations,a high pumping rate and micro-to small-sized proppant can be used in the early stage to ensure effective placement in the branch fractures,followed by medium-to large-sized proppant to ensure adequate placement in the main fracture and enhance the overall conductivity of the fracture network.
作者
郭建春
左恒愽
张涛
唐堂
周航宇
刘彧轩
李明峰
GUO Jianchun;ZUO Hengbo;ZHANG Tao;TANG Tang;ZHOU Hangyu;LIU Yuxuan;LI Mingfeng(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China;Shale Gas Research Institute,PetroChina Southwest Oil&Gasfield Company,Chengdu 610051,China;CHN Energy Yulin Chemical Co.,Ltd.,Yulin 719300,China)
出处
《石油勘探与开发》
北大核心
2025年第5期1189-1198,共10页
Petroleum Exploration and Development
基金
国家自然科学基金联合基金集成项目“湖相多岩相组合页岩油气储层成缝机制及有效开采机理研究”(U23B6004)。
关键词
水力压裂
垂直主裂缝
垂直分支缝
体视粒子图像测速(SPIV)
三维速度场
支撑剂转向
支撑剂输送
hydraulic fracturing
vertical main fracture
vertical branch fracture
stereoscopic particle image velocimetry
three-dimensional velocity field
proppant deflection
proppant transport
