混相压力调节剂提高CO_2驱采收率室内研究
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摘要
中原油田部分区块属于高压低渗透油藏,油层温度高、矿化度高、注入压力过高、注水开发困难。为改善CO_2气驱开发效果,达到混相驱替,选取混相压力调节剂降低最小混相压力。实验测试不同浓度调节剂降低最小混相压力的效果,优选出混相压力调节剂浓度为0.3%(质量浓度),最佳调节剂注入段塞为0.1孔隙体积,最佳注入方式为(当总注入量)大段塞注入。结果表明,混相压力调节剂能明显改善气驱开发效果,为提高类似油藏气驱采收率提供依据。
Some high-pressure & low-permeability blocks of Zhongyuan oilfield have the following characteristics: high pressure,high temperature,high salinity,and low permeability. The layer injection pressure is too high to water injection. In order to promote the recovery efficiency of CO2 flooding to achieve miscible displacement,it selects miscible modulator to reduce the minimum miscible pressure. Using experimental method to test the effect of different concentration and different slug of modulator to reduce the minimum miscible pressure,optimizing the appropriate miscible modulator concentration is 0. 3%( mass concentration),and the optimal modulator injection slug is 0. 1 pore volume. At the same time,we get the conclusion that the best injection way is long slug injection,when the injection slug is the same. The results show that the miscible modulator can significantly improve recovery efficiency of gas flooding. It has important guiding significance for the similar reservoir development.
Some high-pressure & low-permeability blocks of Zhongyuan oilfield have the following characteristics: high pressure,high temperature,high salinity,and low permeability. The layer injection pressure is too high to water injection. In order to promote the recovery efficiency of CO2 flooding to achieve miscible displacement,it selects miscible modulator to reduce the minimum miscible pressure. Using experimental method to test the effect of different concentration and different slug of modulator to reduce the minimum miscible pressure,optimizing the appropriate miscible modulator concentration is 0. 3%( mass concentration),and the optimal modulator injection slug is 0. 1 pore volume. At the same time,we get the conclusion that the best injection way is long slug injection,when the injection slug is the same. The results show that the miscible modulator can significantly improve recovery efficiency of gas flooding. It has important guiding significance for the similar reservoir development.
引文
1 Chen B L,Huang H D,Zhang Y,et al.An improved predicting model for minimum miscibility pressure(MMP)of CO2and crude oil.Journal of Oil and Gas Technology,2013;35(2):126—130
2 Zheng Q,Cheng L S,Huang S J,et al.Prediction of the minimum miscibility pressure of CO2-flooding for low permeability reservoir.Special Oil and Gas Reservoirs,2010;17(5):67—69
3 Li X L,Guo P,Li H C,et al.Determination of minimum miscibility pressure between formation crude and carbon dioxide in Fan 124block of Daluhu oilfield.Petroleum Geology and Recovery Efficiency,2002;9(6):62—63
4 Fouad W A,Berrouk A S.Phase behavior of sour natural gas systems using classical and statistical thermodynamic equations of states.Fluid Phase Equilibria,2013;356:136—145
5 毛振强,陈凤莲.CO2混相驱最小混相压力确定方法研究.成都理工大学学报(自然科学版),2005;32(1):61—64Mao Zhenqiang,Chen Fenglian.Determination of minimum miscible phase pressure for CO2miscible drive.Journal of Chengdu University of Technology(Science&Technology Edition),2005;32(1):61 —64
6 苏玉亮,吴晓东,侯艳红,等.低渗透油藏CO2混相驱油机制及影响因素.中国石油大学学报(自然科学版),2011;35(3):99 —102Su Yuliang,Wu Xiaodong,Hou Yanhong,et al.Mechanism of CO2miscible displacement in low permeability reservoir and influencing factor.Journal of China University of Petroleum,2011;35(3):99 —102
2 Zheng Q,Cheng L S,Huang S J,et al.Prediction of the minimum miscibility pressure of CO2-flooding for low permeability reservoir.Special Oil and Gas Reservoirs,2010;17(5):67—69
3 Li X L,Guo P,Li H C,et al.Determination of minimum miscibility pressure between formation crude and carbon dioxide in Fan 124block of Daluhu oilfield.Petroleum Geology and Recovery Efficiency,2002;9(6):62—63
4 Fouad W A,Berrouk A S.Phase behavior of sour natural gas systems using classical and statistical thermodynamic equations of states.Fluid Phase Equilibria,2013;356:136—145
5 毛振强,陈凤莲.CO2混相驱最小混相压力确定方法研究.成都理工大学学报(自然科学版),2005;32(1):61—64Mao Zhenqiang,Chen Fenglian.Determination of minimum miscible phase pressure for CO2miscible drive.Journal of Chengdu University of Technology(Science&Technology Edition),2005;32(1):61 —64
6 苏玉亮,吴晓东,侯艳红,等.低渗透油藏CO2混相驱油机制及影响因素.中国石油大学学报(自然科学版),2011;35(3):99 —102Su Yuliang,Wu Xiaodong,Hou Yanhong,et al.Mechanism of CO2miscible displacement in low permeability reservoir and influencing factor.Journal of China University of Petroleum,2011;35(3):99 —102