钻井液与完井液2016，Vol.33Issue(6)：121-126,6.DOI:10.3696/j.issn.1001-5620.2016.06.022
压裂液存留液对致密油储层渗吸替油效果的影响
Effect of Retained Fracturing Fluid on the Imbibition Oil Displacement Efficiency of Tight Oil Reservoir
郭钢 1薛小佳 2李楷 1范华波 2刘锦 1吴江2
作者信息
- 1. 长庆油田分公司油气工艺研究院,西安710018
- 2. 低渗透油气田勘探开发国家工程实验室,西安710018
- 折叠
摘要
Abstract
The flowback of fracturing fluid directly affects the production rate of a reservoir in the later stage of production.In laboratory studies,the basic physical properties of reservoir core and fracturing fluid were measured.Based on the measurement,factors affecting automatic imbibition and key factors affecting oil/water replacement by fracturing fluid were studied through experiment.The optimum imbibition recovery rate and the maximum imbibition rate for field use were determined in laboratory studies.Differences between imbibition and displacement are explained by nuclear magnetic experiment.The experimental results have shown that influencing factors affected imbibition rate in an order of:interfacial tension ＞ permeability ＞ viscosity of crude oil ＞ salinity.The imbibition recovery rate increased with increase in permeability,while the amplitude of increase was gradually reducing.When the viscosity of the simulated oil was in a range of 1.204-4.864 mPa · s,the imbibition recovery rate increased with decrease in the viscosity of the simulated oil.When the salinity of the imbibition fluid was in a range of 1 000-80 000 mg/L,the imbibition recovery rate increased with increase in salinity,When the concentration of cleanup additive in imbibition fluid was in a range of 0.005％-5％,i.e.,the interfacial tension was in a range of 0.316-10.815 mN/m,the use of the imbibition fluid containing 0.5％ cleanup additive (interfacial tension 0.869 mN/m) got the maximum imbibition recovery rate.Static imbibition experimental resultshave shown that higher interfacial tension did not necessarily result in higher recovery rate;instead,there was an optimum interfacial tension at which the amount of bypassed oil was minimized,and the imbibition recovery rate was maximized.This finding provides a guide to enhance recovery rate from tight reservoirs.关键词
致密油/自发渗吸/核磁/驱油压裂液Key words
Tight oil/Automatic imbibition/Nuclear magnetic/Orthogonal analysis/Oil driving fracturing fluid分类
能源科技引用本文复制引用
郭钢,薛小佳,李楷,范华波,刘锦,吴江..压裂液存留液对致密油储层渗吸替油效果的影响[J].钻井液与完井液,2016,33(6):121-126,6.
