浅薄层稠油油藏水平井CO_2吞吐效果
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摘要
利用累计增油量和换油率两个指标参数,对冀东油田G区块7口典型水平井CO2吞吐试验效果进行了评价,并利用数值模拟手段对生产历史进行拟合,结合油井地质工艺参数,开展了水平井CO2吞吐提高采收率的作用机理及主要影响因素研究。结果表明,水平井周围含油饱和度越高,CO2吞吐见效越明显;水平井的水平段越长,射开井段越长,注入CO2横向波及范围越大,CO2在底水层中的消耗越少,吞吐效果越好;在CO2吞吐的过程中,CO2不仅溶于原油,还会在注入压力的驱动下,将井底附近的原油驱离井底,使邻井受效;在CO2吞吐结束后,井底附近的含油饱和度大幅度降低,形成"空腔",进而影响下一轮吞吐效果。
The paper uses the 2 indexes of accumulative oil increment and oil exchange ratio to evaluate the field test effects of CO_2 huffand puff in 7 typical horizontal wells in G block of Jidong oilfield, performs the production history matching through numerical simulationand studies the mechanism of CO_2 huff and puff EOR and its main influence factors by combining with geological and engineering parame-ters. The study results show that the higher the oil saturation around horizontal wells, the better the EOR effects by CO_2 huff and puff inhorizontal wells; the longer the horizontal section of horizontal wells, the longer the perforated intervals, the larger the laterally swept areasof CO_2, and the less of CO_2 consumption in bottom-water layer, the better huff and puff effect will be gained. During CO_2 huff and puff, CO_2 is not only dissolved in the oil, but also can drive the oil away from the well bottom under the injection pressure, which could result in theeffects of adjacent wells. After CO_2 huff and puff, the oil saturation around the horizontal well bottom drops dramatically and a cavity willform, which can influence the effect of next cycle of CO_2 huff and puff.
The paper uses the 2 indexes of accumulative oil increment and oil exchange ratio to evaluate the field test effects of CO_2 huffand puff in 7 typical horizontal wells in G block of Jidong oilfield, performs the production history matching through numerical simulationand studies the mechanism of CO_2 huff and puff EOR and its main influence factors by combining with geological and engineering parame-ters. The study results show that the higher the oil saturation around horizontal wells, the better the EOR effects by CO_2 huff and puff inhorizontal wells; the longer the horizontal section of horizontal wells, the longer the perforated intervals, the larger the laterally swept areasof CO_2, and the less of CO_2 consumption in bottom-water layer, the better huff and puff effect will be gained. During CO_2 huff and puff, CO_2 is not only dissolved in the oil, but also can drive the oil away from the well bottom under the injection pressure, which could result in theeffects of adjacent wells. After CO_2 huff and puff, the oil saturation around the horizontal well bottom drops dramatically and a cavity willform, which can influence the effect of next cycle of CO_2 huff and puff.
引文
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[9]王子强,张代燕,杨军,等.普通稠油油藏渗流特征实验研究——以新疆油田九4区齐古组油藏为例[J].石油与天然气地质,2012,33(2):302-306.WANG Ziqiang,ZHANG Daiyan,YANG Jun,et al.Experimentals study on percolation characteristics of ordinary heavy oil reservoirs:a case study from the Qigu formation reservoir in Nine-4 block of Xinjiang oilfield[J].Oil&Gas Geology,2012,33(2):302-306.
[10]张娟.浅薄稠油油藏水平井二氧化碳吞吐数值模拟研究[D].成都:西南石油大学,2012.ZHANG Juan.Numerical simulation study of CO2huff-n-puff in thin heavy oil reservoirs[D].Chengdu:Southwest Petroleum University,2012.
[11]何应付,梅士盛,杨正明,等.苏丹Palogue油田稠油CO2吞吐开发影响因素数值模拟分析[J].特种油气藏,2006,13(1):64-67.HE Yingfu,MEI Shisheng,YANG Zhengming,et al.Numerical simulation analyze of CO2huff-n-puff influence factors in thin heavy oil reservoirs[J].Special Oil&Gas Reservoirs,2006,13(1):64-67.
[12]孙凯.CO2吞吐室内实验研究及现场试验[D].大庆:东北石油大学,2014.SUN Kai.CO2huff-n-puff laboratory experiment and field test[D].Daqing:Northeast Petroleum University,2014.
[13]史英,盖长城,颜菲,等.稠油油藏CO2吞吐合理吞吐轮次[J].大庆石油地质与开发,2017,36(1):129-133.SHI Ying,GAI Changcheng,YAN Fei,et al.The reasonable CO2huff-n-puff rounds of heavy oil reservoirs[J].Petroleum Geology&Oilfield Development in Daqing,2017,36(1):129-133.
[2]沈晓英,汤勇,王卫东,等.吐哈油田稠油油藏优化注气吞吐降黏实验研究[J].钻采工艺,2013,36(5):88-91.SHEN Xiaoying,TANG Yong,WANG Weidong,et al.Huff and puff visbreaking experiment in Tuha oilfield heavy oil reservoir[J].Drilling&Production Technology,2013,36(5):88-91.
[3]刘博.CO2吞吐降压开采模拟实验研究[J].钻采工艺,2017,40(2):41-44.LIU Bo.Simulation test on CO2huff-n-puff depressurization production.[J].Drilling&Production Technology,2017,40(2):41-44.
[4]张朝富,刘滨,蒲玉娥,等.稠油油藏CO2吞吐参数优化[J].新疆石油地质,2011,32(5):528-530.ZHANG Chaofu,LIU Bin,PU Yu'e,et al.Optimization of CO2huff and puff parameter of heavy oil reservoirs[J].Xinjiang Petroleum Geology,2011,32(5):528-530.
[5]孙雷,庞辉,孙扬,等.浅层稠油油藏CO2吞吐控水增油机理研究[J].西南石油大学学报(自然科学版),2014,36(6):88-94.SUN Lei,PANG Hui,SUN Yang,et al.Mechanism study on water control and enhanced oil recovery by CO2huff-puff for shallow heavy oil reservoir[J].Journal of Southwest Petroleum University(Science&Technology Edition),2014,36(6):88-94.
[6]杨正明,刘学伟,张仲宏,等.致密油藏分段压裂水平井注二氧化碳吞吐物理模拟[J].石油学报,2015,36(6):725-728.YANG Zhengming,LIU Xuewei,ZHANG Zhonghong,et al.Physical simulation of stage-fracturing horizontal wells using CO2huff-puff in tight oil reservoirs[J].Acta Petrolei Sinica,2015,36(6):725-728.
[7]周玉辉.准噶尔盆地稠油油藏CO2驱提高采收率及埋存技术可行性研究[D].成都:西南石油大学,2014.ZHOU Yuhui.Research on feasibility of CO2flooding and storage technology application in Junggar basins heavy oil reservoir[D].Chengdu:Southwest Petroleum University,2014.
[8]张本艳,党文斌,王少朋,等.鄂尔多斯盆地红河油田长8储层致密砂岩油藏注CO2提高采收率[J].石油与天然气地质,2016,37(2):272-275.ZHANG Benyan,DANG Wenbin,WANG Shaopeng,et al.CO2-EOR in Chang 8 tight sandstone reservoir of Honghe oilfield in Ordos basin[J].Oil&Gas Geology,2016,37(2):272-275.
[9]王子强,张代燕,杨军,等.普通稠油油藏渗流特征实验研究——以新疆油田九4区齐古组油藏为例[J].石油与天然气地质,2012,33(2):302-306.WANG Ziqiang,ZHANG Daiyan,YANG Jun,et al.Experimentals study on percolation characteristics of ordinary heavy oil reservoirs:a case study from the Qigu formation reservoir in Nine-4 block of Xinjiang oilfield[J].Oil&Gas Geology,2012,33(2):302-306.
[10]张娟.浅薄稠油油藏水平井二氧化碳吞吐数值模拟研究[D].成都:西南石油大学,2012.ZHANG Juan.Numerical simulation study of CO2huff-n-puff in thin heavy oil reservoirs[D].Chengdu:Southwest Petroleum University,2012.
[11]何应付,梅士盛,杨正明,等.苏丹Palogue油田稠油CO2吞吐开发影响因素数值模拟分析[J].特种油气藏,2006,13(1):64-67.HE Yingfu,MEI Shisheng,YANG Zhengming,et al.Numerical simulation analyze of CO2huff-n-puff influence factors in thin heavy oil reservoirs[J].Special Oil&Gas Reservoirs,2006,13(1):64-67.
[12]孙凯.CO2吞吐室内实验研究及现场试验[D].大庆:东北石油大学,2014.SUN Kai.CO2huff-n-puff laboratory experiment and field test[D].Daqing:Northeast Petroleum University,2014.
[13]史英,盖长城,颜菲,等.稠油油藏CO2吞吐合理吞吐轮次[J].大庆石油地质与开发,2017,36(1):129-133.SHI Ying,GAI Changcheng,YAN Fei,et al.The reasonable CO2huff-n-puff rounds of heavy oil reservoirs[J].Petroleum Geology&Oilfield Development in Daqing,2017,36(1):129-133.