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不同提液方式对强水驱海相砂岩油藏驱油效率影响的实验研究

李伟 王亚会 陈肖 蒋鏖 杨勇 王伟峰

李伟, 王亚会, 陈肖, 蒋鏖, 杨勇, 王伟峰. 不同提液方式对强水驱海相砂岩油藏驱油效率影响的实验研究[J]. 地质科技通报, 2021, 40(5): 301-306. doi: 10.19509/j.cnki.dzkq.2021.0030
引用本文: 李伟, 王亚会, 陈肖, 蒋鏖, 杨勇, 王伟峰. 不同提液方式对强水驱海相砂岩油藏驱油效率影响的实验研究[J]. 地质科技通报, 2021, 40(5): 301-306. doi: 10.19509/j.cnki.dzkq.2021.0030
Li Wei, Wang Yahui, Chen Xiao, Jiang Ao, Yang Yong, Wang Weifeng. Experimental study on the effect of different liquid extraction methods on the oil displacement efficiency of strong water flooding marine sandstone reservoirs[J]. Bulletin of Geological Science and Technology, 2021, 40(5): 301-306. doi: 10.19509/j.cnki.dzkq.2021.0030
Citation: Li Wei, Wang Yahui, Chen Xiao, Jiang Ao, Yang Yong, Wang Weifeng. Experimental study on the effect of different liquid extraction methods on the oil displacement efficiency of strong water flooding marine sandstone reservoirs[J]. Bulletin of Geological Science and Technology, 2021, 40(5): 301-306. doi: 10.19509/j.cnki.dzkq.2021.0030

不同提液方式对强水驱海相砂岩油藏驱油效率影响的实验研究

doi: 10.19509/j.cnki.dzkq.2021.0030
详细信息
    作者简介:

    李伟(1972-), 男, 高级工程师, 主要从事油田开发、油藏工程及油藏管理工作。E-mail: liwei1@cnooc.com.cn

  • 中图分类号: TE357.1

Experimental study on the effect of different liquid extraction methods on the oil displacement efficiency of strong water flooding marine sandstone reservoirs

  • 摘要: 南海东部海相砂岩强底水驱稠油油藏经过多年开发,面临油田综合含水高、采出程度低的问题,油井提液是改善开发效果、实现稳产增产的重要措施,目前国内外关于不同提液方式对驱油效率的影响研究较少。为此,基于PY油田主力油藏典型渗透率级别天然岩心,开展了实际油藏条件下的水驱油核磁共振实验研究,分析了高含水期中不同提液组合方式下驱油效率的变化,从不同孔隙类型的动用程度揭示了影响驱油效率变化的内在因素并优选出适合该类型油藏的提液方式。实验结果表明:在多次控幅提液方式下,较于其他提液方式驱油效率平均提高了6.08%,能大幅提高微孔与小孔的动用程度,孔隙动用程度平均增加了7.76%,提液效果最佳。该成果为海相砂岩稠油油藏制定合理提液技术政策提供了依据。

     

  • 图 1  核磁共振成像实验设备图

    Figure 1.  Diagram of MRI experimental equipment

    图 2  核磁共振成像实验流程示意图

    Figure 2.  Schematic diagram of the MRI experiment process

    图 3  4种提液方式下注入PV数与驱油效率曲线图

    Figure 3.  Injection of PV number and oil displacement efficiency in four types of extraction methods

    图 4  A-1和A-2核磁T2弛豫谱

    Figure 4.  A-1 and A-2 NMR T2 relaxation spectrum

    图 5  A-3和A-4核磁T2弛豫谱

    Figure 5.  A-3 and A-4 NMR T2 relaxation spectrum

    图 6  4种提液方式下孔隙的动用程度

    Figure 6.  Sweep degree of pores under four extration methods

    表  1  水驱油核磁成像提液方案设计

    Table  1.   Design of water-flooding nuclear magnetic imaging fluid extraction scheme

    岩心渗透率/10-3 μm2 原油黏度/(mPa·s) 提液方式
    2 000 100 中高含水期多次控幅提液:0.1 mL/min至含水率80%或80%~90%+0.5 mL/min×5 PV+1 mL/min×5 PV+1.5 mL/min至含水率100%(驱替PV数>20 PV)
    特高含水期多次控幅提液:0.1 mL/min至含水率95%+0.5 mL/min×5 PV+1 mL/min×5 PV+1.5 mL/min至含水率100%
    中高含水期一次大幅提液:0.1 mL/min至含水率90%或>90%+1.5 mL/min至含水率100%
    特高含水期一次大幅提液:0.1 mL/min至含水率95%+1.5 mL/min至含水率100%
    下载: 导出CSV

    表  2  取心岩样基本参数

    Table  2.   Basic parameters of coring rock samples

    岩心编号 岩心长度/cm 岩心直径/cm 液测孔隙度/% 气测渗透率/10-3 μm2
    A-1 4.54 2.42 33.45 2 157.68
    A-2 4.31 2.41 31.46 1 793.97
    A-3 4.78 2.39 32.37 1 969.33
    A-4 4.72 2.42 34.09 2 116.18
    下载: 导出CSV

    表  3  地层水分析资料

    Table  3.   Analysis data of formation water

    离子 Na+/K+ Ca2+ Mg2+ Cl- HCO3- SO42- 总矿化度
    质量浓度/(mg·L-1) 10 166 695 191 17 409 76 0 28 537
    下载: 导出CSV

    表  4  4种提液方式下岩心基础数据

    Table  4.   Basic data of cores in four types of extraction methods

    岩心编号 孔隙度/% 渗透率/10-3 μm2 饱和油/mL 束缚水饱和度/% 实验
    A-1 33.45 2 157.68 5.60 19.84 高含水期一次大幅提液
    A-2 31.46 1 793.97 5.05 18.43 特高含水期一次大幅提液
    A-3 32.37 1 969.33 5.50 20.76 高含水期多次控幅提液
    A-4 34.09 2 116.18 5.85 20.96 特高含水期多次控幅提液
    下载: 导出CSV

    表  5  4种提液方式下驱油效率的实验结果

    Table  5.   Experiment result of oil displacement efficiency in four types extraction methods

    提液方式 提液时含水率/% 单次提液幅度/% 驱油效率/%
    高含水期一次大幅提液 95 - 54.46
    特高含水期一次大幅提液 90 - 59.41
    高含水期多次控幅提液 80 10.90, 3.64, 1.81 63.64
    特高含水期多次控幅提液 95 9.83, 4.27, 0.85 62.39
    下载: 导出CSV

    表  6  一次大幅提液不同驱替阶段累计孔隙度分量统计

    Table  6.   Accumulated porosity components in different displacement stages of a large-scale fluid extraction

    岩心编号 提液方式 0.1 mL/min 1.5 mL/min 低速水驱 提液后
    阶段末φ/% 孔隙度分量减小值/%
    A-1 中高一次 14.12 10.74 11.44 3.38
    A-2 特高一次 13.01 10.28 11.65 2.73
    下载: 导出CSV

    表  7  多次控幅提液不同驱替阶段累计孔隙度分量统计

    Table  7.   Accumulated porosity components in different displacement stages of multiple amplitude control fluid extraction

    岩心编号 提液方式 0.1 mL/min 一次 二次 三次 一次提液 二次提液 三次提液
    φ/% 孔隙度分量减小值/%
    A-3 中高多次控幅 15.84 12.58 11.59 11.16 3.26 0.99 0.43
    A-4 特高多次控幅 13.49 10.62 9.38 8.33 2.87 1.24 1.05
    下载: 导出CSV
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  • 收稿日期:  2020-08-09

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