摘要
低渗透油藏开采存在储层孔喉细小、连通性较低、驱替压力大、注采不易见效等问题,而纳米材料具有小尺寸效应,能够轻松通过低渗油藏的孔喉注入储层,通过改性的纳米材料形成的纳米乳液可以有效扩大波及体积,进而提高驱油效率。为满足低渗透油藏高效提高采收率的需求,制备一种新型纳米乳液作为低渗油藏提高采收率的驱油剂,并对其物理、化学特性及其室内驱油效果进行分析研究。室内实验表明制得的纳米乳液液滴粒径中值为5.37 nm,粒径极小,且分布均匀,ξ电位绝对值为43.30 mV,属于稳定体系。通过傅里叶红外光谱法证实了纳米流体中亲水官能团的存在,其使得本身疏水的聚硅氧烷更容易分散于极性介质中,有利于纳米流体在岩石表面的铺展及润湿,提高了纳米流体稳定性,室内物理驱油实验表明该纳米乳液水驱后提高采收率20%以上,具有较好的应用前景。
The exploitation of low-permeability reservoirs has problems such as small pore throat,low connectivity,large displacement pressure,and difficult injection and production,while nanomaterials have small size effects,which can be easily injected into the reservoir through the pore throat of low-permeability reservoirs,and the nanoemulsion formed by modified nanomaterials can effectively expand the sweep volume,thereby improving the oil displacement efficiency.In order to meet the needs of efficient oil recovery in low permeability reservoirs,a new nanoemulsion was prepared as an oil displacement agent for enhanced oil recovery in low permeability reservoirs,and its physical and chemical characteristics and indoor oil displacement effects were analyzed.Indoor experiments showed that the median particle size of the prepared nanoemulsion droplets was 5.37nm,the particle size was extremely small,and the distribution was uniform,and the absolute value of ξ potential was 43.30mV,which belonged to a stable system.The existence of hydrophilic functional groups in nanofluids wasconfirmed by Fourier infrared spectroscopy,which madethe hydrophobic polysiloxane more easily dispersed in polar media,which wasconducive to the spreading and wetting of nanofluids on the rock surface to improve the stability of nanofluids.Laboratory physical oil displacement experiments showed that the recovery rate of the nano-emulsion after water flooding wasmore than 20%,having a good application prospect.
作者
张艺千
何英伟
石芳
吴景春
ZHANG Yi-qian;HE Yin-wei;SHI Fang;WU Jing-chun(Key Laboratory for EOR Technology(Ministry of Education),Northeast Petroleum University,Daqing Heilongjiang 163318,China;No.10 Oil Production Plant of Daqing Oilfield Company,Daqing Heilongjiang 163315,China)
出处
《当代化工》
CAS
2023年第8期1933-1937,共5页
Contemporary Chemical Industry
基金
黑龙江省本科高校引导创新基金项目(项目编号:15071202205)
黑龙江省自然科学基金资助项目(项目编号:LH2019E020)。
关键词
纳米乳液
低渗透油藏
稳定性
提高采收率
Nanoemulsion
Low permeability reservoir
Stability
Enhanced oil recovery
