强1区块轻质油藏注空气驱可行性研究

发布时间：2018-05-28 13:27

  本文选题：强1区块 + 低温氧化　； 参考：《东北石油大学》2017年硕士论文

【摘要】：近几年辽河油田低渗油藏开发效果较差,由于低渗透油藏注水开发难以建立有效驱替系统,因此急需转变开发方式。空气驱是改善低渗油藏开发效果的有效技术,特别是空气驱具有成本低、驱油效率高等优势,而在辽河油田该项技术研究仍属起步阶段,由此本文对轻质油藏空气驱进行可行性研究。本文通过调研国内外文献对轻质油藏空气驱研究现状进行归纳总结空气驱提高采收率机理。进行轻质油藏注空气驱室内实验:填砂管模型实验和细长管模型实验,对不同注气压力、不同油藏温度及不同注气速度对采收率的影响进行实验结果分析。并建立低温氧化数学模型并结合强1区实际地质特征建立空气驱模型,对开发因素和地质因素进行数值模拟研究,其中开发因素包括井距、注气速度和注入压力;地质因素包括渗透率极差,地层倾角和油藏温度,考察这六大因素对空气驱开发效果的影响。同时制定减小氧气浓度的注入气体组合,形成减氧空气驱开发方式,对减氧空气驱开发效果进行评价。研究表明,注入0.19PV时,气体发生突破,在气体突破前可形成含油饱和度较高的油墙;强1区的井距为400m,注气速度为200t/d,注入压力为16MPa,渗透率级差为40,地层倾角为10°,油藏温度为85℃时,空气驱的开发效果最佳。强1区块注空气开发效果明显好于水驱,对空气驱进行开发方案预测,生产指标结果表明,该区块进行空气驱开发潜力巨大。
[Abstract]:In recent years, the development effect of low permeability reservoir in Liaohe Oilfield is poor, and it is difficult to establish an effective displacement system for water injection development in low permeability reservoir, so it is urgent to change the development mode. Air flooding is an effective technology to improve the development effect of low permeability reservoirs, especially the air flooding has the advantages of low cost and high oil displacement efficiency. In this paper, the feasibility of air flooding in light reservoirs is studied. This paper summarizes the mechanism of air flooding for oil recovery in light reservoirs by investigating domestic and foreign literatures. Laboratory experiments of air flooding in light reservoirs are carried out: sand pipe model experiment and slender pipe model experiment. The experimental results of different gas injection pressure, different reservoir temperature and different gas injection velocity on oil recovery are analyzed. The mathematical model of low temperature oxidation is established and the air drive model is established in combination with the actual geological characteristics of area 1. The development factors including well spacing, gas injection velocity and injection pressure are studied numerically. The geological factors include permeability, dip angle and reservoir temperature. The influence of these six factors on the development effect of air flooding is investigated. At the same time, the injection gas combination to reduce the oxygen concentration is made to form the development mode of the deoxidized air drive, and the development effect of the reduced-oxygen air drive is evaluated. The results show that when 0.19PV is injected, the oil wall with high oil saturation can be formed before the gas breakthrough. When well spacing is 400 m, gas injection velocity is 200 t / d, injection pressure is 16 MPA, permeability difference is 40, formation dip angle is 10 掳, reservoir temperature is 85 鈩，

本文编号：1946890