沈161块低渗透油藏水驱后高压注空气数值模拟研究

发布时间：2018-07-06 21:05

本文选题：开发效果评价 + 数值模拟　；参考：《东北石油大学》2015年硕士论文

【摘要】：把空气注入轻质油油藏可以认为是一种新的三次采油提高采收率的方法。在空气注入轻质油油藏时,氧气同原油之间就会发生放热化学反应,发生的这些反应主要是氧化反应,不仅产生热量而且伴随氧的消耗会产生碳的氧化物(主要是CO和CO2)。本文所研究的沈161区块为深层低渗透轻质油油藏,目前已经进入注水开发中后期开发阶段,主要面临着注水压力高,注水困难和采出程度低等问题。注水开发18年之后,断块采出程度仅为13.0%,目前还有48.7681×104t剩余可采储量未有效动用,油田下步开发仍具备较大的潜力。因此,明确剩余油分布规律,研究油藏高压注空气提高采收率成为本次研究的主要问题。根据研究区实际静态数据,应用经验公式法和水驱规律曲线法等油藏工程分析方法,着重研究了水驱采收率、含水变化规律、目前井网井距适应性等方面;在精细三维地质模型的基础上,利用Eclipse数值模拟软件对研究区进行了剩余油分布规律进研究;根据研究区剩余油分布规律及开发特征,建立了高压空气驱数值模拟模型,对试验区进行选择,并对高压注空气的井网、井距进行了初步论证,给出了合理的注气参数,在此基础上,对研究区进行整体高压空气驱方案预测,生产指标和经济评价表明,研究区进行高压注空气后,区块的采收率为10.02%,达到了预期的效果,为现场实施高压注空气技术提供了理论基础,具有重要的指导意义。
[Abstract]:Injecting air into light oil reservoir can be regarded as a new method to improve oil recovery by tertiary oil recovery. When air is injected into light oil reservoir, exothermic chemical reactions occur between oxygen and crude oil. These reactions are mainly oxidation reactions, which not only produce heat but also produce carbon oxides (mainly CO and CO 2) with oxygen consumption. The Shen161 block studied in this paper is a deep low permeability light oil reservoir. It has entered the middle and late stage of water injection development at present. It is mainly faced with the problems of high water injection pressure, difficult water injection and low recovery degree. After 18 years of water injection development, the recovery degree of fault block is only 13.00.At present, there are still 48.7681 脳 104t remaining recoverable reserves that have not been used effectively, and the next step development of oil field still has great potential. Therefore, it is the main problem of this study to determine the distribution of remaining oil and to study high pressure air injection to improve oil recovery. According to the actual static data of the study area, the reservoir engineering analysis methods such as empirical formula method and water drive law curve method are applied to study the water drive recovery factor, water cut variation law, and the adaptability of well spacing at present. On the basis of fine 3D geological model, the residual oil distribution law in the study area was studied by using Eclipse numerical simulation software, and the numerical simulation model of high pressure air drive was established according to the distribution law and development characteristics of remaining oil in the study area. The experimental area is selected, and the well pattern and well spacing of high pressure air injection are preliminarily demonstrated, and reasonable gas injection parameters are given. On the basis of this, the overall high pressure air drive scheme prediction, production index and economic evaluation are carried out in the study area. After high pressure air injection in the study area, the recovery factor of the block is 10.02, which achieves the expected effect, which provides a theoretical basis for the field implementation of high pressure air injection technology and has important guiding significance.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357

【参考文献】