Analyzing and Understanding the Influencing Factors of CO2 Flooding in the Subei Complex Fault Block Reservoirs
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摘要: 苏北盆地复杂断块油藏CO2驱油效果差异较大，为制定提高CO2驱油效果的有效措施，分析了其主要影响因素。对苏北9个CO2驱区块的相关数据进行了统计，分析了井型、压裂情况、注气前油井产油量、注采比和注气方式等对CO2驱油效果的影响。分析结果为：直井的开发效果好于水平井，非压裂井的效果好于压裂井，油井初产量越高则CO2驱油效果越好，最佳注采比为2.5左右，而注CO2方式对开发效果影响不大。研究结果表明，低渗透油藏采用的井型、油井是否压裂、注气前油井产油量是影响CO2驱油效果的主要因素，在研究制定提高苏北盆地复杂断块油藏CO2驱油效果的技术措施时，应充分考虑这些主要影响因素。Abstract: The performance of CO2 flooding in the complex fault block reservoirs of the Subei Basin varies greatly. In order to find effective measures to improve the development of these unique fault-block reservoirs, the main influencing factors were analyzed. Based on the data from 9 CO2 flooding blocks in north Jiangsu, the influences of well type, fracturing conditions, initial production before gas injection, the injection-production ratio and the gas injection method on CO2 flooding effects were analyzed. The analysis results show that the development effect of vertical wells is better than that of horizontal wells, and it is better for non-fractured wells than fractured. The higher the initial production of the well, the better the CO2 flooding effect. The optimal injection-production ratio is around 2.5, while CO2 injection methods play an insignificant role in the development effect. The results show that those factors, such as low permeability reservoir well type and the necessity of reservoir stimulation, are the main factors influencing CO2 flooding. Those issues need to be fully considered in improving the CO2 flooding effect in the complex fault block reservoirs in the Subei Basin.
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Key words:
- CO2 flooding /
- well type /
- oil saturation /
- injection-production ratio /
- fault block reservoir /
- Subei Basin
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图 1 注CO2开发不见效水平井日产油量叠加曲线
Figure 1. Normalized daily oil rate superposition curve of a non-affected horizontal well after CO2 injection
图 2 注CO2开发见效水平井日产油量叠加曲线
Figure 2. A normalized daily oil rate superposition curve of affected horizontal well after CO2 injection
图 3 注CO2见效前后日产量之间关系
Figure 3. The relationship between daily oil rates before and after effective CO2 flooding
图 4 CZ区块注CO2采油井日产油量与注采比的关系
Figure 4. The relationship curves of daily oil rate and injection-production ratio of CO2 flooding in wells in the CZ Block
图 5 TN区块注CO2采油井日产油量与注采比的关系
Figure 5. The relationship curves for the daily oil rate and the injection-production ratio of CO2 flooding well in the TN Block
图 6 ZJD区块注CO2采油井日产油量与注采比的关系
Figure 6. Relationship curves for the daily oil rate and injection-production ratio of CO2 flooding well in the ZJD Block
表 1 苏北盆地9个注CO2区块油藏基本参数
Table 1. Basic reservoir parameters of 9 CO2 flooding blocks in the Subei Basin
区块
名称层位 油藏
类型油藏中深/
m油藏有效
厚度/m原始地层
压力/MPa地层温度/
℃孔隙
度，%渗透率/
mD地下原油密度/
（kg·L–1）地下原油黏度/
（mPa·s）CS 泰州组 低渗透 2 860.00 38.80 32.7 110.0 14.1 46.0 0.754 3 19.85 CS 阜三段 低渗透 2 945.00 9.20 30.8 104.0 19.0 12.9 0.799 0 5.14 TN 阜三段 低渗透 2 521.80 14.50 26.3 86.7 20.1 47.0 0.788 0 5.67 JN 阜二段 低渗透 2 160.00 6.90 22.5 74.3 13.0 17.0 0.816 9 8.40 ZJD 阜三段 特低渗透 3 150.00 5.10 40.8 105.9 17.8 5.6 0.803 4 3.79 QT 阜三段 特低渗透 3 056.00 5.80 30.9 101.2 17.7 4.0 0.803 4 3.78 HL 阜三段 中高渗 2 364.60 2.90 24.6 81.3 26.7 93.7 0.821 0 7.86 ZC 垛一段 中高渗 1 649.70 25.40 16.0 75.6 27.1 1 394.0 0.866 9 26.35 XB 垛一段 普通稠油 1 948.00 7.40 22.2 81.0 28.4 120.0 0.888 9 5 335.87 
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表 2 注CO2区块直井见气见效情况
Table 2. Flooding effects and gas production in vertical wells in a CO2 flooding blocks
区块及层位 井数/口 见效井
占比，%不见效井
占比，%油井 见气不
见效不见气
不见效见气
见效CN泰州组 14 3 1 10 71 29 CN阜一段 1 0 0 1 100 0 CZ阜三段 11 0 3 8 73 27 TN阜三段 9 1 2 6 67 33 HL阜三段 3 1 2 0 0 100 ZJD阜三段 2 0 0 2 100 0 QT阜三段 1 0 1 0 0 100 ZC垛一段 7 0 2 5 71 29 合计 48 5 11 32 67 33
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表 3 注CO2区块水平井见气见效情况
Table 3. Flooding effect and gas production in horizontal wells in CO2 flooding block
区块及层位 井数/口 见效井
占比，%不见效井
占比，%油井 见气不
见效不见气
不见效见气
见效CN泰州组 2 1 1 0 0 100 CN阜一段 2 2 0 0 0 100 TN阜三段 2 2 0 0 0 100 HL阜三段 1 0 0 1 0 0 ZJD阜三段 7 2 3 2 29 71 QT阜三段 7 4 1 2 29 71 合计 21 11 5 5 24 76
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表 4 注CO2水平井压裂后见气见效情况
Table 4. Flooding effect and gas production of CO2 flooding in fractured horizontal wells
区块及层位 井数/口 见效井
占比，%不见效井
占比，%油井 见气不
见效不见气
不见效见气
见效CN阜一段 1 1 0 0 0 100 TN阜三段 2 2 0 0 0 100 ZJD阜三段 5 2 3 0 0 100 QT阜三段 7 4 1 2 29 71 合计 15 9 4 2 13 87
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表 5 注CO2未压裂水平井见气见效情况
Table 5. Flooding effect and gas production of CO2 flooding in non-fractured horizontal wells
区块及层位 井数/口 见效井
占比，%不见效井
占比，%油井 见气不
见效不见气
不见效见气
见效CN泰州组 2 1 1 0 0 100 CN阜一段 1 1 0 0 0 100 HL阜三段 1 0 0 1 100 0 ZJD阜三段 2 0 0 2 100 0 合计 6 2 1 3 50 50
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表 6 苏北盆地注CO2见效井日产油量统计
Table 6. Statistics on the oil production of wells with effective CO2 flooding in the Subei Basin
采油井名 日产油量/t 单井日增油量/t 增油倍比 注气前 注气见效后 T111-1 0.44 1.09 0.65 1.48 TP5 0.98 2.86 1.88 1.92 T6 1.05 3.29 2.24 2.13 C32 1.35 2.60 1.25 1.93 H5P1 1.43 4.23 2.80 1.96 C34 1.56 3.90 2.34 2.50 CZ1–9 1.57 3.80 2.23 1.42 T11 1.58 3.32 1.74 2.10 CZ1–9 1.60 3.90 2.30 1.44 T7 1.65 4.61 2.96 2.79 CN2 1.68 5.90 4.22 2.51 CQK–118 1.83 3.81 1.98 1.08 CZ2 2.00 4.09 2.09 2.05 CZ1–4 2.24 4.60 2.36 1.05 ZH1–2 2.25 5.98 3.73 1.66 Z6 2.25 6.30 4.05 1.80 C14 2.40 5.30 2.90 1.21 S15–18 2.59 5.97 3.38 1.31 C18 2.69 5.51 2.82 1.05 Q101–1HF 2.71 4.86 2.15 0.79 CZ1–3 3.05 4.82 1.77 1.58 CZ1–6 3.20 6.90 3.70 1.16 ZH1–4 3.90 8.33 4.43 1.14 CQK–14 4.96 10.00 5.04 1.02 Q1–20 5.83 8.55 2.72 0.47 ZH1–6 6.86 14.70 7.84 1.14 QK–26 7.20 14.95 7.75 1.08 ZH3-XIE1 8.64 15.07 6.43 1.74 平均 2.84 6.04 3.21 1.30
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[1] 钟张起,吴义平,付艳丽,等. 低渗透油藏CO2驱注入方式优化[J]. 特种油气藏, 2012, 19(1): 82–84. doi: 10.3969/j.issn.1006-6535.2012.01.019ZHONG Zhangqi, WU Yiping, FU Yanli, et al. Injection optimization in CO2 flooding for low permeability reservoir[J]. Special Oil and Gas Reservoirs, 2012, 19(1): 82–84. doi: 10.3969/j.issn.1006-6535.2012.01.019 [2] 唐人选,唐小立,秦红祥. 注CO2混相驱油藏合理采收率确定[J]. 石油钻探技术, 2012, 40(3): 112–115. doi: 10.3969/j.issn.1001-0890.2012.03.023TANG Renxuan, TANG Xiaoli, QIN Hongxiang. Determination of reasonable recovery ratio with CO2 miscible flooding in reservoir[J]. Petroleum Drilling Techniques, 2012, 40(3): 112–115. doi: 10.3969/j.issn.1001-0890.2012.03.023 [3] 宋道万. 二氧化碳混相驱数值模拟结果的主要影响因素[J]. 油气地质与采收率, 2008, 15(4): 72–74. doi: 10.3969/j.issn.1009-9603.2008.04.022SONG Daowan. Main factors affecting numerical simulation results of carbon dioxide miscible flooding[J]. Petroleum Geology and Recovery Efficiency, 2008, 15(4): 72–74. doi: 10.3969/j.issn.1009-9603.2008.04.022 [4] 吴忠宝,甘俊奇,曾倩. 低渗透油藏二氧化碳混相驱油机理数值模拟[J]. 油气地质与采收率, 2012, 19(3): 67–70. doi: 10.3969/j.issn.1009-9603.2012.03.018WU Zhongbao, GAN Junqi, ZENG Qian. Numerical simulation of mechanism of CO2 mixed flooding in low permeability reservoirs[J]. Petroleum Geology and Recovery Efficiency, 2012, 19(3): 67–70. doi: 10.3969/j.issn.1009-9603.2012.03.018 [5] 王欢,廖新维,赵晓亮. 特低渗透油藏注 CO2驱参数优化研究[J]. 西南石油大学学报(自然科学版), 2014, 36(6): 95–104. doi: 10.11885/j.issn.1674-5086.2012.08.30.03WANG Huan, LIAO Xinwei, ZHAO Xiaoliang. Research on CO2 flooding parameters optimization of extra-low permeability reservoirs[J]. Journal of Southwest Petroleum University (Science & Technology Edition), 2014, 36(6): 95–104. doi: 10.11885/j.issn.1674-5086.2012.08.30.03 [6] 王觉民,蒋华全. 水平井对各类油气藏的适应性分析[J]. 图书与石油科技信息, 1993, 7(4): 29–41.WANG Juemin, JIANG Huaquan. Adaptability analysis of horizontal wells to various oil and gas reservoirs[J]. Library & Petroleum Science-Technology Information, 1993, 7(4): 29–41. [7] 庄永涛,刘鹏程,郝明强,等. 低渗透油藏CO2驱井网模式数值模拟[J]. 断块油气田, 2013, 20(4): 477–480.ZHUANG Yongtao, LIU Pengcheng, HAO Mingqiang, et al. Numerical simulation of well pattern mode for CO2 flooding in low permeability reservoir[J]. Fault-Block Oil & Gas Field, 2013, 20(4): 477–480. [8] 谢尚贤,韩培慧,钱昱. 大庆油田萨南东部过渡带注CO2驱油先导性矿场试验研究[J]. 油气采收率技术, 1997, 4(3): 13–19.XIE Shangxian,HAN Peihui,QIAN Yu. Pilot field test of CO2 injection for oil displacement in the eastern transitional zone of Sanan, Daqing Oilfield[J]. Oil and Gas Recovery Technology, 1997, 4(3): 13–19. [9] 俞凯, 刘伟, 陈祖华, 等．陆相低渗透油藏CO2混相驱技术[M]．北京: 中国石化出版社, 2015: 7–146．YU Kai, LIU Wei, CHEN Zuhua, et al. CO2 miscible flooding technology in continental low permeability reservoirs[M]. Beijing: China Petrochemical Press, 2015: 7–146. -
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