摘要
针对矿场尺度下致密储层纳米乳液渗吸规律不清楚的问题,基于数值模拟方法,从实验室尺度和矿场尺度2个方面对纳米乳液渗吸采收率的影响因素进行分析。结果表明:实验室尺度下,随着渗透率的增加,渗吸采收率增至47%后保持稳定;随着毛细管压力的增加,渗吸采收率逐渐增至61%;随着临界吸附量逐渐增加,渗吸采收率先稳定在28%,后降至2%。矿场尺度下,随着渗透率、毛细管压力和扩散系数的增加,渗吸采收率分别增至38%、35%、11%;随着临界吸附量逐渐增加,渗吸采收率逐渐降低至5%。矿场尺度的渗吸采收率影响因素变化规律与实验室尺度有所不同,主要原因为实验室尺度下基质体积小,岩心与压裂液接触面积大,压裂液能够进入岩心所有孔隙,与实际现场不符。该研究对致密油藏的压裂液参数设计具有指导作用。
To address the unclear understanding of the imbibition patterns of nanoemulsions in tight reservoirs at the field scale,a numerical simulation method was employed to analyze the factors influencing the imbibition recovery rate from both laboratory and field scales.The results show that at the laboratory scale,as permeability increases,the imbibition recovery rate rises to 47%and then stabilizes;with increasing capillary pressure,the recovery rate gradually increases to 61%;and as the critical adsorption amount increases,the recovery rate initially stabilizes at 28%before decreasing to 2%.At the field scale,the imbibition recovery rate increases to 38%,35%,and 11%with the rise in permeability,capillary pressure,and diffusion coefficient,respectively;and it decreases to 5%as the critical adsorption amount gradually increases.The variation patterns of factors influencing the imbibition recovery rate at the field scale differ from those at the laboratory scale,primarily because the smaller matrix volume and larger contact area between the core and fracturing fluid at the laboratory scale allow the fracturing fluid to enter all pores of the core,which does not reflect the actual field conditions.This study provides guidance for the design of fracturing fluid parameters in tight oil reservoirs.
作者
梁星原
韩国庆
周福建
梁天博
岳震铎
杨凯
LIANG Xingyuan;HAN Guoqing;ZHOU Fujian;LIANG Tianbo;YUE Zhenduo;YANG Kai(State Key Laboratory of Oil and Gas Resources and Engineering,China University of Petroleum(Beijing),Beijing 102249,China)
出处
《特种油气藏》
北大核心
2025年第2期95-102,共8页
Special Oil & Gas Reservoirs
基金
国家自然科学基金“致密油储层压裂后渗吸动用程度微观控制机理研究”(52204059)
中国石油大学(北京)科研启动基金“智能柱塞气举排水采气技术研究”(2462023YJRC019)。
关键词
致密油藏
纳米乳液
低渗储层
水力压裂
表面活性剂
润湿
tight oil reservoirs
nanoemulsions
low-permeability reservoirs
hydraulic fracturing
surfactants
wettability
