摘要
为改善辽河油田潜山油藏S625区块注水开发中后期产量递减快、采收率低、注水难度大等问题,在室内采取不同含氧量减氧空气配置实验方法,并借助物理模型、高温高压PVT等实验装置,开展减氧空气驱实验。结果表明,地层温度压力下,静态低温氧化后原油中轻质组分减少,重质组分增加;随含氧量增多,氧化程度增强,O_(2)利用率与转化率升高,产出气中CO_(2)含量增加,但不高于0.6%。油藏温度较低时(110℃),随含氧量增多,低温氧化作用对驱油效率贡献率增大,但含氧量变化对气驱驱油效率影响不明显。在地层温度下注减氧空气比单纯注氮气对原油膨胀性能好,低于饱和压力时,随着压力增加,原油溶解能力增强;同一压力下,含氧量越多,原油溶解能力越强,体积系数越大,有利于提高原油采收率。
In order to solve the problems in the middle and late stage of water injection development in block S625 of Liaohe oil field,such as rapid production decline,low recovery great difficulty on water injection and etc.,the experimental methods of oxygen reducing air configuration with different oxygen content were adopted in laboratory.By means of physical model,high-temperature and high-pressure PVT and other experimental devices,the experimental study on oxygen reducing air flooding is carried out.The experimental results show:after static low-temperature oxidation under formation temperature and pressure,the light components in crude oil decrease and the heavy components increase;with the increase of oxygen content,the oxidation degree becomes obvious,the oxygen utilization and conversion rates increase,and CO_(2)concentration in the produced gas increases,not more than 0.6%.When the reservoir temperature is low(110℃),with the increase of oxygen content,the contribution rate of low-temperature oxidation to oil displacement efficiency increases,but the change of oxygen content has no obvious effect on gas displacement efficiency.Under the formation temperature,oxygen reducing air injection is better than nitrogen injection on the expansion performance of crude oil.Below the saturation pressure,the solubility of crude oil increases with the increase of pressure.Under the same pressure,the higher the oxygen content,the stronger the crude oil solubility and the larger the volume coefficient,which is beneficial to enhance the oil recovery.
作者
张鸿
王岐
马宝全
ZHANG Hong;WANG Qi;MA Baoquan(Exploration&Development Research Institute of Liaohe Oilfield Company,PetroChina,Panjin,Liaoning 124010,China;National Energy Heavy Oil R&D Center,Panjin,Liaoning 124010,China;No.2 Oil Production Plant of Dagang Oilfield Co.,Ltd.,PetroChina,Daqing,Heilongjiang 163414,China)
出处
《石油地质与工程》
CAS
2021年第6期68-72,共5页
Petroleum Geology and Engineering
基金
中国油田天然气股份有限公司重大科技专项“辽河油田千万吨稳产关键技术研究与应用”(2017E-1603)。
关键词
潜山油藏
减氧空气驱
低温氧化
溶胀实验
buried hill reservoir
oxygen reducing air flooding
low temperature oxidation
swelling experiment
