CO_2在准噶尔盆地昌吉油田吉7井区稠油中的溶解性研究
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摘要
为论证CO_2驱油技术在准噶尔盆地昌吉油田吉7井区稠油开发中的可行性,开展了原油注CO_2膨胀实验及细管驱替实验,以研究CO_2在研究区稠油中的溶解特性。实验结果表明:(1)在目前16.41MPa地层压力的条件下,当CO_2注入比例达到50mol/mol时可使原油黏度降低42.3%~66.7%,原油密度由0.9011g/cm3降低至0.8428g/cm3,体积系数增大20%,原油膨胀系数增加至1.13~1.24,气油比增加6.3~8倍,饱和压力增大140%~306%;(2)随注入压力提高,地层原油采收率不断增加,气体突破较晚,当注入压力为45MPa时,地层原油采收率为46.68%,表现为非混相驱特征;(3)实验结果表明CO_2对研究区稠油具有很好的降黏和膨胀作用,表明CO_2非混相驱油技术适用于研究区特深层稠油油藏开发。
To demonstrate the feasibility of CO_2 flooding development of the heavy reservoirs in Well Ji7 of Changji oilfield in the Junggar Basin, experiments on injecting CO_2 into crude oil and slim-tube displacement were carried out to investigate the solubility of CO_2 in heavy oil. The experiment results proved that:(1) When injecting CO_2 at 50 mol/mol at present 16.41 MPa underground pressure, the viscosity of the crude oil was reduced by 42.3%-66.7%, the density was reduced from 0.9011 g/cm3 to 0.8428 g/cm3, the volume factor was increased by 20%, the expansion factor was increased to 1.13-1.24, the gas-to-oil ratio increased by 6.3-8 times, and the saturation pressure increased by 140%-306%.(2) The oil recovery increased with injection pressure, and gas breakthrough was delayed. When the injection pressure was 45 MPa, the oil recovery was 46.68%, and non-miscible displacement worked.(3) CO_2 effectively reduced the viscosity and made the crude oil expand in the study area. All these results above show that CO_2 flooding technology is effective for the development of deep heavy oil reservoirs in the study area.
To demonstrate the feasibility of CO_2 flooding development of the heavy reservoirs in Well Ji7 of Changji oilfield in the Junggar Basin, experiments on injecting CO_2 into crude oil and slim-tube displacement were carried out to investigate the solubility of CO_2 in heavy oil. The experiment results proved that:(1) When injecting CO_2 at 50 mol/mol at present 16.41 MPa underground pressure, the viscosity of the crude oil was reduced by 42.3%-66.7%, the density was reduced from 0.9011 g/cm3 to 0.8428 g/cm3, the volume factor was increased by 20%, the expansion factor was increased to 1.13-1.24, the gas-to-oil ratio increased by 6.3-8 times, and the saturation pressure increased by 140%-306%.(2) The oil recovery increased with injection pressure, and gas breakthrough was delayed. When the injection pressure was 45 MPa, the oil recovery was 46.68%, and non-miscible displacement worked.(3) CO_2 effectively reduced the viscosity and made the crude oil expand in the study area. All these results above show that CO_2 flooding technology is effective for the development of deep heavy oil reservoirs in the study area.
引文
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[2]孙赞东,贾承造,李相方.非常规油气勘探与开发[M].北京:石油工业出版社,2011:274-298.Sun Zandong,Jia Chengzao,Li Xiangfang.Unconventional oil&gas exploration and development[M].Beijing:Petroleum Industry Press,2011:274-298.
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[4]顾浩,孙建芳,秦学杰,董翠,李洪毅,郑昕.稠油热采不同开发技术潜力评价[J].油气地质与采收率,2018,25(3):112-116.Gu Hao,Sun Jianfang,Qin Xuejie,Dong Cui,Li Hongyi,Zheng Xin.Potential evaluation of different thermal-recovery technologies for heavy oil[J].Petroleum Geology and Recovery Efficiency,2018,25(3):117-121.
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[7]彭永灿,史艳玲,崔志松,王桂军,刘建,程中疆,等.中深层稠油油藏有效开发方式探讨[J].石油天然气学报,2014,36(12):183-186.Peng Yongchan,Shi Yanling,Cui Zhisong,Wang Guijun,Liu Jian,Cheng Zhongjiang,et al.The effective development ways of mid-deep heavy oil reservoirs[J].Journal of Oil and Gas Technonlogy,2014,36(12):183-186.
[8]桑林翔,杨兆中,杨果,丁超,支锦飞.高黏稠油生物降黏驱替技术实验研究[J].特种油气藏,2017,24(6):148-151.Sang Linxiang,Yang Zhaozhong,Yang Guo,Ding Chao,Zhi Jinfei.Experimental study of biological viscosity reduction for high-viscosity heavy oil[J].Special Oil&Gas Reservoirs,2017,24(6):148-151.
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[10]胡文瑞.中国低渗透(致密)油气勘探开发技术研讨会论文集[M].北京:石油工业出版社,2010:111-122.Hu Wenrui.Symposium of exploration and development technology of low permeability or tight reservoir in China[M].Beijing:Petroleum Industry Press,2010:111-122.
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[18]程杰成,朱维耀,姜洪福.特低渗油藏CO2驱油多相渗流理论模型研究及应用[J].石油学报,2008,29(2):246-251.ChengJiecheng,ZhuWeiyao,JiangHongfu.Studyon mathematicalformulti-phaseporousflowinCO2driveof extra-lawpermeabilityreservoirandfieldapplication[J].Acta Petrolei Sinica,2008,29(2):246-251.
[19]王一平,孙业恒,吴光焕,邓宏伟.超深层稠油二氧化碳吞吐渗流规律[J].特种油气藏,2017,24(4):142-146.Wang Yiping, Sun Yeheng, Wu Guanghuan, Deng Hongwei.Permeability rule of CO2 huff and puff for ultra-deep heavy oil reservoirs[J]. Special Oil&Gas Reservoirs, 2017,24(4):142-146.
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