摘要
为了研究断块油藏特高含水阶段剩余油再聚集速度及其影响因素的敏感性,以胜利东辛油田断块油藏为研究对象,从剩余油的受力分析入手,计算原油聚集的驱替压力梯度后认为:当持续注采时,与注采井间注采驱替压力梯度相比,剩余油分异再聚集的动力处于次要地位;当油藏高含水废弃静置后,注采井间驱替压力梯度逐渐消失,剩余油的分异再聚集动力则发挥主要作用,并在油层高部位重新聚集形成剩余油富集区。正交试验结果表明,影响东辛油田高渗稀油断块油藏剩余油再聚集速度的主要因素为地层渗透率,而地下原油黏度、原油密度,地层倾角、综合含水率为次要因素。
In order to study the re-accumulation rate of residual oil and the sensitivity of its influencing factors in fault block reservoir at ultra-high water cut stage,this paper takes the fault block reservoir of Dongxin oilfield in Shengli as the research object,starts with the stress analysis of residual oil,calculates the displacement pressure gradient of crude oil accumulation,and considers that when continuous injection and production,compared with the injection and production displacement pressure gradient between injection and production wells,the dynamic force of residual oil differentiation and re accumulation is obvious When the reservoir is abandoned with high water cut,the displacement pressure gradient between injection and production wells will gradually disappear,and the differentiation and re accumulation power of remaining oil will play a major role.Affected by this,the remaining oil will re-accumulate in the high part of the reservoir to form the remaining oil enrichment area.According to the orthogonal test analysis,the main factors affecting the remaining oil re-accumulation rate of the medium high permeability thin oil fault block reservoir in Dongxin oilfield are formation permeability,underground crude oil viscosity,crude oil density,and the secondary factors are formation dip angle and comprehensive water cut.
作者
吴义志
WU Yizhi(Research Institute of Exploration and Development, Shengli Oilfield Company, SINOPEC, Dongying, Shandong 257000, China)
出处
《中国科技论文》
CAS
北大核心
2022年第1期105-109,共5页
China Sciencepaper
基金
国家科技重大专项(2016ZX05011-002)。
关键词
断块油藏
剩余油
再聚集速度
敏感性
fault block reservoir
remaining oil
re-aggregation rate
sensitivity
