影响直流电驱油效率的因素分析  

THE ANALYSIS OF FACTORS INFLUENCING DISPLACEMENT EFFICIENCY BY DIRECT CURRENT

作　　者：彭珏[1] 康毅力[2] 王秀娟[1] 李松远[1] 

机构地区：[1]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [2]油气藏地质及开发工程国家重点实验室·西南石油大学,四川新都610500

出　　处：《大庆石油地质与开发》2010年第2期123-126,共4页Petroleum Geology & Oilfield Development in Daqing

基　　金：中国石油天然气股份有限公司科技创新研究项目和四川省青年科技基金项目（02ZQ026-042）资助.

摘　　要：直流电采油是针对我国低渗透油藏敏感性矿物丰富、孔隙喉道小、微孔隙发育、比表面积大、流体与岩石界面作用力显著等特点提出的旨在提高油井产量和采收率的一种高效开发新技术。利用室内驱替实验研究了直流电电位梯度及渗透率大小对驱油效率的影响。结果表明，不同渗透率岩样具有对应的最佳直流电电位梯度，利用该电位梯度驱油能使驱油效率达到最大值，而当岩样渗透率达到20×10^-3μm^2左右时，电场提高的驱油效率值达到最大，渗透率继续增加，驱油效率提高幅度反而开始下降。证实了利用反向直流电提高水驱油效率，特别是低渗透油层水驱油效率的有效性。The low permeability oil reservoirs are featured by abundant sensitive minerals, small pore throat, developed mieropores, large specific surface area and strong interface action between rocks and fluids. The direct current oil recovery technique is a new efficient development technology focusing on these problems and increasing oil production. The effect of the electric potential gradient of the direct current and permeability on the oil displacement efficiency has been studied based on the displacement experiments. According to the experimental results, the cores with different permeability have their corresponding optimum direct current potential gradient, and the oil displacement efficiency will be the maximum when displacing oil under the optimum electric potential gradient. When the permeability of the rock sample is about 20×10^-3μm^2 , the improved displacement efficiency under the electrical field reaches the maximum, and if the permeability continues to increase, the improved value of oil displacement efficiency begins to decrease. In this paper, it is proved that the inverse direct current can be used to improve the oil displacement efficiency of water flooding, and it is especially effective in low permeability oil reservoirs.

关 键 词：低渗透 反向直流电 电位梯度 渗透率 驱油效率 

分 类 号：TE357[石油与天然气工程—油气田开发工程]