长庆姬塬油田黄3区CO_2驱对采出原油物性影响

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英文篇名：Effect of CO_2 flooding on physical properties of produced crude oil in Huang 3 block of Changqing Oilfield 作者：刘笑春 ; 黎晓茸 ; 杨飞涛 ; 马国伟 ; 梁晓静 英文作者：Liu Xiaochun;Li Xiaorong;Yang Feitao;Ma Guowei;Liang Xiaojing;Oil and Gas Technology Research Institute Changqing Oilfield Company, PetroChina;National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields PetroChina;No.5 Oil Production Plant Changqing Oilfield Company, PetroChina;Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences; 关键词：CO_2驱 ; 原油族组分 ; 原油凝点 ; 黏温曲线 英文关键词：CO_2 flooding;;crude oil group components;;crude oil pour point;;viscosity-temperature curve 中文刊名：KTDQ 英文刊名：Reservoir Evaluation and Development 机构：中国石油长庆油田分公司油气工艺研究院;中国石油低渗透油气田勘探开发国家工程实验室;中国石油长庆油田分公司第五采油厂;中国科学院兰州化学物理研究所; 出版日期：2019-06-26 出版单位：油气藏评价与开发 年：2019 期：v.9;No.50 基金：国家示范工程“长庆低渗透砂岩油藏CO2驱油与埋存注采工艺配套”(2016ZX05056002);; 中国石油重大科技专项“CO2驱油与埋存注采配套技术研究”(2014E-3603) 语种：中文; 页：KTDQ201903009 页数：5 CN：03 ISSN：32-1825/TE 分类号：42-46

摘要

为深入研究CO_2驱提高原油采收率方法对原油物性的影响,加深了解CO_2驱油机理,为CO_2驱现场试验效果分析提供理论依据,针对在长庆姬塬油田黄3区进行的CO_2驱提高原油采收率现场试验,采用柱色谱法、气相色谱—质谱联用法等方法对长庆姬塬油田黄3区CO_2驱油前后采出原油的物性变化进行了详细研究,重点考察了原油族组分含量、不同碳链烷烃含量、凝点、黏温曲线的变化情况。试验结果表明:注入CO_2后,原油烷烃组分先减小后增加,非烃和沥青质组分先增加后减小;原油烷烃组分中轻质烷烃(C_8—C_(16))先减小后增加,重质烷烃(C_(17)—C_(40))含量先增加后减小;原油凝点先升高后降低,原油黏度低温(35℃)略有升高,高温下无明显变化。上述结果符合CO_2混相驱油机理,原油物性的变化是由CO_2抽提机理和CO_2萃取机理共同作用的结果。通过上述研究,为CO_2驱油机理的认识提供了数据支撑,为进一步制定提高CO_2驱油效率方案提供了一定依据。
        In order to study the effect of CO_2 flooding on the physical properties of crude oil, understand the mechanism of CO_2 flooding, and provide theoretical basis for the analysis of field test results of CO_2 flooding, the field test of CO_2 flooding in Huang 3 block of Jiyuan oilfield in Changqing was carried out by column chromatography and gas chromatography-mass spectrometry. The physical properties of crude oil produced before and after CO_2 flooding in Huang 3 block of Jiyuan oilfield, Changqing, were studied in detail by means of column chromatography, gas chromatography and mass spectrometry method and other methods. The changes of crude oil group content, different carbon chain alkanes content, solidification point and viscosity-temperature curve were mainly investigated. The experimental results show that after CO_2 injection, the alkane fraction of crude oil first decreases and then increases, while the non-hydrocarbon and asphaltene fraction first increases and then decreases; the light alkane(C_8—C_(16))in the alkane fraction of crude oil first decreases and then increases, the heavy alkane(C_(17)—C_(40))content first increases and then decreases; the pour point of crude oil first increases and then decreases, and the viscosity of crude oil at low temperature(35 ℃)increased slightly, but there was no obvious change at high temperature. The above results accord with the mechanism of CO_2 miscible flooding.The change of crude oil physical properties is the result of the interaction of CO_2 extraction mechanism. Through the above research, it provides data support for understanding the mechanism of CO_2 flooding, and provides a certain basis for further formulating plans to improve the efficiency of CO_2 flooding.

引文

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