板桥油田特高含水期水平井CO_2吞吐参数优化及实施
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摘要
目前板桥油田板14-1断块油藏含水率98.1%,采出程度10.93%,常规控水稳油技术已无法解决油藏含水高、产能低、经济效益差的问题。和常规控水增油技术相比,CO_2吞吐压锥具有工艺简单、施工周期短、成功率较高等优势。采用数值模拟技术研究了CO_2吞吐降水增油机理,并在此基础上,优化了CO_2吞吐工艺参数,确定了油藏水平井CO_2吞吐最优工艺方案。在方案优选基础上,现场实施了CO_2吞吐方案。研究结果显示,CO_2吞吐通过气驱压锥,萃取原油中间组分,降低原油黏度机理实现了特高含水期水平井控水增油;通过对比不同工艺参数下单井累计增油量及换油率,CO_2的最优注入量为600 t、注入速度4.0 t/h、焖井时间17 d、产液量16 m~3/d、吞吐轮次2个。45H井现场先导试验显示,45H井产液量为12 m~3/d,含水率由98.1%降低至62.5%,产油量由1.6 m3/d上升至4.73 m3/d,CO_2吞吐控制底水锥进、降低油井含水率和恢复产能效果明显。研究表明,水平井CO_2吞吐对板桥油田同类油藏具有较好的适应性和应用推广前景。
At present, the water cut of fault block 14-1 reservoir in Banqiao Oilfield is 98.1 % and the recovery degree is 10.93 %.Conventional water control and oil stabilization technology can not solve the problems of high water cut, low productivity and poor economic benefit. Compared with conventional water control and oil enrichment technology, CO_2 huff and puff cone has the advantages of simple technology, short construction period and high success rate. The mechanism of precipitation and oil increase by CO_2 huff and puff is studied by numerical simulation technology. On this basis, the technological parameters of CO_2 huff and puff are optimized, and the optimal technological scheme of CO_2 huff and puff for horizontal wells in reservoirs is determined. On the basis of scheme optimization, CO_2 huff and puff scheme was implemented on site. The results show that CO_2 huff and puff achieves water control and oil increase in horizontal wells at extra high water cut period by extracting the intermediate components of crude oil through gas drive pressure cone and reducing the viscosity mechanism of crude oil. By comparing the cumulative oil increase and oil exchange rate of single well under different process parameters, the optimal injection rate of CO_2 is 600 t, injection rate is 4.0 t/h,soaking time is 17 d, fluid production is 16 m~3/d, and the number of huff and puff cycles is two. Field pilot test of well 45 H shows that the fluid production of well 45 H is 12 m~3/d, the water cut is reduced from 98.1 % to 62.5 %, and the oil production is increased from 1.6 m~3/d to 4.73 m~3/d. CO_2 huff and puff can control bottom water coning, reduce water cut and restore productivity effectively.The results show that horizontal well CO_2 huff and puff has good adaptability and application prospect for similar reservoirs in Banqiao Oilfield.
At present, the water cut of fault block 14-1 reservoir in Banqiao Oilfield is 98.1 % and the recovery degree is 10.93 %.Conventional water control and oil stabilization technology can not solve the problems of high water cut, low productivity and poor economic benefit. Compared with conventional water control and oil enrichment technology, CO_2 huff and puff cone has the advantages of simple technology, short construction period and high success rate. The mechanism of precipitation and oil increase by CO_2 huff and puff is studied by numerical simulation technology. On this basis, the technological parameters of CO_2 huff and puff are optimized, and the optimal technological scheme of CO_2 huff and puff for horizontal wells in reservoirs is determined. On the basis of scheme optimization, CO_2 huff and puff scheme was implemented on site. The results show that CO_2 huff and puff achieves water control and oil increase in horizontal wells at extra high water cut period by extracting the intermediate components of crude oil through gas drive pressure cone and reducing the viscosity mechanism of crude oil. By comparing the cumulative oil increase and oil exchange rate of single well under different process parameters, the optimal injection rate of CO_2 is 600 t, injection rate is 4.0 t/h,soaking time is 17 d, fluid production is 16 m~3/d, and the number of huff and puff cycles is two. Field pilot test of well 45 H shows that the fluid production of well 45 H is 12 m~3/d, the water cut is reduced from 98.1 % to 62.5 %, and the oil production is increased from 1.6 m~3/d to 4.73 m~3/d. CO_2 huff and puff can control bottom water coning, reduce water cut and restore productivity effectively.The results show that horizontal well CO_2 huff and puff has good adaptability and application prospect for similar reservoirs in Banqiao Oilfield.
引文
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[18]汤勇,杜志敏,孙雷,等.CO2在地层水中溶解对驱油过程的影响[J].石油学报,2011,32(2):311-314.
[19]汤勇,尹鹏,汪勇,等.CO2混相驱的可行性评价[J].西南石油大学学报:自然科学版,2014,36(2):133-138.
[20] Tang Y, Su Z, He J, et al. Numerical simulation and optimization of enhanced oil recovery by the in situ generated CO2huffn-puff process with compound surfactant[J]. Journal of Chemistry, 2016, 2016:1-13.
[21]马桂芝,陈仁保,张立民,等.南堡陆地油田水平井二氧化碳吞吐主控因素[J].特种油气藏,2013,20(5):81-85.
[22]马奎前,黄琴,张俊,等.南堡35-2油田CO2吞吐提高采收率研究[J].重庆科技学院学报:自然科学版,2011,(1):28-32.
[23]刘合,王峰,张劲,等.二氧化碳干法压裂技术-应用现状与发展趋势[J].石油勘探与开发,2014,41(4):466-472.
[2]范凤英,韩炜,郭东华,等.化学凝胶隔板阻断底水锥进矿场试验[J].钻采工艺,2003,26(4):97-99.
[3]孙琳,赵凡琪,张芸,等.高温高盐底水油藏氮气泡沫压锥实验研究[J].油气地质与采收率,2017,24(6):97-102.
[4]王鹏,赵凤兰,侯吉瑞,等.氮气泡沫吞吐抑制潜山底水油藏水平井底水锥进实验研究[J].油气地质与采收率,2018,25(5):110-115.
[5]陈平,郑继龙,宋志学,等.吞吐井氮气泡沫抑制边底水实验研究[J].科学技术与工程,2013,13(34):10147-10149.
[6]刘晓强,曲占庆,杜勇.底水油藏CO2控水实验[J].断块油气田,2016,23(3):350-353.
[7]李国永,叶盛军,冯建松,等.复杂断块油藏水平井二氧化碳吞吐控水增油技术及其应用[J].油气地质与采收率,2012,19(4):62-65.
[8]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.
[9]王春智,李兆敏,刘伟,等. HDCS吞吐转蒸汽驱物理模拟研究[J].特种油气藏,2014,21(4):93-96.
[10]杨艳霞.超深层稠油HDCS开发技术研究与应用[J].断块油气田,2012,19(S1):64-67.
[11]朱国梁.深层稠油油藏水锥机理及HDCS实验研究[J].特种油气藏,2011,18(4):90-93.
[12]段志刚,杜勇,龚雪峰,等.深层稠油油藏DCS技术研究及应用[J].特种油气藏,2011,18(6):113-116.
[13]赵淑霞,何应付,王铭珠,等.特超稠油HDCS吞吐影响因素分析及潜力评价方法[J].断块油气田,2016,23(1):69-72.
[14]聂建华,唐周怀. HDCS技术在毛8块的探索与应用[J].石油化工应用,2013,32(6):28-30.
[15]唐钢,薄纯辉,刘承杰,等.断块稠油油藏化学吞吐工艺技术研究与应用[J].西南石油大学学报:自然科学版,2012,34(4):141-146.
[16]李兆敏,陶磊,张凯,等. CO2在超稠油中的溶解特性实验[J].中国石油大学学报:自然科学版,2008,32(5):92-96.
[17]刘伟,秦学成,唐建信,等.苏北复杂断块油田CO2吞吐提高采收率[J].西南石油大学学报:自然科学版,2009,31(2):100-104.
[18]汤勇,杜志敏,孙雷,等.CO2在地层水中溶解对驱油过程的影响[J].石油学报,2011,32(2):311-314.
[19]汤勇,尹鹏,汪勇,等.CO2混相驱的可行性评价[J].西南石油大学学报:自然科学版,2014,36(2):133-138.
[20] Tang Y, Su Z, He J, et al. Numerical simulation and optimization of enhanced oil recovery by the in situ generated CO2huffn-puff process with compound surfactant[J]. Journal of Chemistry, 2016, 2016:1-13.
[21]马桂芝,陈仁保,张立民,等.南堡陆地油田水平井二氧化碳吞吐主控因素[J].特种油气藏,2013,20(5):81-85.
[22]马奎前,黄琴,张俊,等.南堡35-2油田CO2吞吐提高采收率研究[J].重庆科技学院学报:自然科学版,2011,(1):28-32.
[23]刘合,王峰,张劲,等.二氧化碳干法压裂技术-应用现状与发展趋势[J].石油勘探与开发,2014,41(4):466-472.