摘要
通过系统总结火驱油墙的研究成果,提出油墙的定义及定量判定指标,并以气液两相稳态渗流理论为基础,建立考虑温度梯度的一维正向干式火驱渗流新模型。通过实验、单因素分析与正交实验设计,验证了模型的可靠性,揭示了火驱过程中油墙的形成机理及主控因素,探讨了火驱过程中油墙形成的最佳条件。研究表明,火驱油墙的形成受3个主要因素控制:(1)油墙的形成存在温度区间和临界温度梯度绝对值,温度过高或过低,温度梯度绝对值低于临界值,油墙不能形成;(2)对稠油油藏火驱而言,原油黏度控制油墙形成的宽度与速度,黏度越低,形成油墙越宽,速度越快;(3)含油饱和度影响油墙形成最佳温度与速度,含油饱和度越高,最佳储集层温度越低,形成速度越快。一维正向干式火驱渗流新模型结合正交设计方法,可优选出稠油油藏火驱油墙形成的最佳条件组合。
Based on the systematic summary of current research on oil bank,the definition of oil bank in the process of fire flooding and its quantitative indices were proposed; and a new one-dimensional positive dry-fire flooding model considering temperature gradient was established based on the steady flow theory of gas and liquid phases.Single factor analysis and orthogonal experiments were adopted to verify the reliability and reveal the formation mechanisms and the controlling factors of the oil bank.Then the optimal conditions for the oil bank to form were discussed.The study results show the formation of the oil bank is controlled by 3 factors：（1） Oil bank would come into being within a certain temperature interval and above a critical value of temperature gradient（absolute value）,with temperature too high or too low and temperature gradient absolute value lower than the critical value,the oil bank couldn＇t form.（2） For fire flooding process in heavy oil reservoirs,the viscosity of oil influences the width of oil bank and the speed at which oil bank forms; the lower the oil viscosity is,the wider the oil bank is and the faster the oil bank forms.（3） Oil saturation could affect the developing temperature and speed of oil bank.The favorable temperature at which oil bank develops gets lower and the accumulating speed of oil gets faster when the oil saturation is higher.By orthogonal experiments with the model,the optimal combinations of reservoir conditions for forming oil bank during fire flooding in heavy oil reservoirs can be worked out.
作者
李秋
易雷浩
唐君实
关文龙
蒋有伟
郑浩然
周久宁
王晓春
LI Qiu1, 2, YI Leihao3, TANG Junshi1, 2, GUAN Wenlong1, 2, JIANG Youwei1, 2, ZHENG Haoran1, 2, ZHOU Jiuning1, 2, WANG Xiaochun1, 2(1. State Key Laboratory of Enhanced Oil Recovery, Beijing 100083, China; 2. PetroChina Research Institute of Petroleum Exploration ＆ Development, Beijing 100083, China; 3. College of Petroleum Engineering, China University of Petroleum, Beijing 102249, Chin)
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2018年第3期474-481,共8页
Petroleum Exploration and Development
基金
国家科技重大专项"超深层稠油有效开发技术研究与试验"(2016ZX05012-004)
中国石油天然气股份有限公司科学研究与技术开发项目"注空气氧化机理及优化控制技术"(2016B-1402)
关键词
稠油火驱
油墙
判定指标
渗流模型
单因素分析
主控因素
正交试验
fire flooding heavy oil
oil bank
flow model
single factor analysis
controlling factor
orthogonal experiment
