温西一区块注氮气提高采收率技术研究

发布时间：2018-05-09 04:09

本文选题：低渗透油藏 + 氮气驱　；参考：《东北石油大学》2017年硕士论文

【摘要】：吐哈油田属于中-低渗透油田,油藏物性复杂,非均质性强。尽管采取了注水等一系列有效措施,但注水水质标准要求高,处理难度大,成本高,注水压力高,从而水井发生套损现象比较普遍,水井利用率低,有的油藏甚至根本注不进水;另外,低渗油藏泥质含量高,水敏感性强,容易造成不可恢复的地层伤害,这样仍有大部分原油残留在地下采不出来。综合考虑,目前气驱比较适合中-低渗透油藏开发,进入20世纪80年代以后,由于氮气来源广泛、价格低廉、无腐蚀、无污染等独特优越性,使得氮气驱已成为注气开发的新技术、新趋势,特别是对注水困难的低渗透油藏和构造油藏,注氮气的确取得了很好的效果。进入20世纪80年代,随着制氮气技术的提高,氮气的价格越来越低廉,另外,其来源广、无腐蚀、无污染的独特优势,使氮气驱提高采收率技术成为注气开发的新技术、新趋势,特别是对注水困难的低渗透和陡构造油藏,注氮气的确取得了很好的效果。为探索吐哈油田注氮气提高低渗透油藏采收率的可行性,本文首先对国内外有关氮气驱室内研究和矿场应用情况进行了充分调研,并在此基础上制定了氮气驱选区的主要原则,根据此原则筛选出了温西一区块为该课题的研究区块,并针对该区块的油藏地质条件,选取了有代表性的油、气、水和岩心样品,进行了系统的实验研究。氮气与地层油的相特性研究,即氮气对地层油的膨胀降粘试验研究和氮气与地层油的多次接触试验研究;氮气与地层油的界面张力研究等,并研究了氮气的多种注入方式、注入时机等对氮气驱效果的影响等。通过对氮气驱的驱油机理、对地层油相态参数的改善程度和规律、氮气驱的驱油效果评价、氮气驱的注入工艺参数优化等系统的室内实验研究。分析表明选取合适的油藏类型和合适的注入方式,在吐哈油田开展氮气驱提高低渗透油藏的采收率在技术上是完全可行的。
[Abstract]:Tuha Oilfield belongs to middle-low permeability oil field with complex physical properties and strong heterogeneity. Although a series of effective measures such as water injection have been taken, the water quality standard is high, the treatment is difficult, the cost is high, and the water injection pressure is high. As a result, the phenomenon of casing damage in wells is relatively common, and the utilization rate of wells is low. Some reservoirs do not even inject water at all, in addition, low permeability reservoirs have high muddy content and strong water sensitivity, which can easily cause irrecoverable formation damage, so most of the crude oil remains in the underground can not be produced. Considering comprehensively, gas drive is more suitable for the development of medium-low permeability reservoirs at present. After the 1980s, because of its unique advantages such as wide sources of nitrogen, low price, no corrosion and no pollution, etc. Nitrogen flooding has become a new technology and trend of gas injection development, especially for low permeability reservoirs and structural reservoirs where water injection is difficult. In the 1980s, with the improvement of nitrogen production technology, the price of nitrogen gas is becoming more and more low. In addition, its unique advantages of wide source, no corrosion, no pollution, make the technology of enhanced oil recovery by nitrogen drive become a new technology of gas injection development. New trends, especially for low permeability and steep structural reservoirs with difficult water injection, have achieved good results in nitrogen injection. In order to explore the feasibility of nitrogen injection to improve oil recovery in low permeability reservoirs in Turpan-Hami Oilfield, this paper makes a full investigation on the indoor research and field application of nitrogen flooding at home and abroad, and on this basis, the main principles of nitrogen flooding selection are established. According to this principle, the Wenxi block is selected as the research block, and the representative oil, gas, water and core samples are selected for the reservoir geological conditions of the block, and a systematic experimental study is carried out. The study on the phase characteristics of nitrogen gas and formation oil, that is, the experimental study on the expansion and viscosity reduction of formation oil by nitrogen gas, the experimental study on the multiple contact between nitrogen gas and formation oil, and the study on the interfacial tension between nitrogen gas and formation oil, etc., and the study on various injection modes of nitrogen gas. The effect of injection time on nitrogen displacement. The laboratory experimental study on the oil displacement mechanism of nitrogen drive, the improvement degree and rule of oil phase parameters, the evaluation of oil displacement effect of nitrogen drive and the optimization of injection process parameters of nitrogen drive were carried out. The analysis shows that it is technically feasible to develop nitrogen flooding to improve oil recovery in low permeability reservoirs in Turpan-Hami Oilfield by selecting the appropriate reservoir types and injection methods.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE357.7

【相似文献】