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川南深层页岩气开发实践与面临的挑战

詹国卫 杨建 赵勇 张南希 王保保 李曙光

詹国卫, 杨建, 赵勇, 张南希, 王保保, 李曙光. 川南深层页岩气开发实践与面临的挑战[J]. 石油实验地质, 2023, 45(6): 1067-1077. doi: 10.11781/sysydz2023061067
引用本文: 詹国卫, 杨建, 赵勇, 张南希, 王保保, 李曙光. 川南深层页岩气开发实践与面临的挑战[J]. 石油实验地质, 2023, 45(6): 1067-1077. doi: 10.11781/sysydz2023061067
ZHAN Guowei, YANG Jian, ZHAO Yong, ZHANG Nanxi, WANG Baobao, LI Shuguang. Development practice and challenges of deep shale gas in southern Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(6): 1067-1077. doi: 10.11781/sysydz2023061067
Citation: ZHAN Guowei, YANG Jian, ZHAO Yong, ZHANG Nanxi, WANG Baobao, LI Shuguang. Development practice and challenges of deep shale gas in southern Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(6): 1067-1077. doi: 10.11781/sysydz2023061067

川南深层页岩气开发实践与面临的挑战

doi: 10.11781/sysydz2023061067
基金项目: 

中国石化科技部重点科技项目“威荣深层页岩气立体开发优化技术研究” P22041

详细信息
    作者简介:

    詹国卫(1976—),男,博士,高级工程师,从事非常规油气勘探开发工作。E-mail: zhanguowei.xnyq@sinopec.com

    通讯作者:

    杨建(1983—),男,硕士,副研究员,从事非常规气藏工程方面研究工作。E-mail: yangjianchn@126.com

  • 中图分类号: TE37

Development practice and challenges of deep shale gas in southern Sichuan Basin

  • 摘要: 深层页岩气资源量丰富,开发潜力巨大,但工程地质条件相对略差,效益开发难度较大。为支撑深层页岩气的效益开发,以四川盆地南部地区威荣和永川气田的开发实践为例,针对深层页岩气构造复杂、断缝发育、优质储层薄、产量递减快、最终可采储量低等难点,以“布好井、打好井、管好井”为目标,在气藏精细描述、渗流实验等研究基础上,采用地球物理—地质建模—压裂模拟—数值模拟一体化方法,形成了以地质甜点评价与预测技术、复杂构造区井网优化设计技术、“四位一体”钻井跟踪保障技术和全生命周期生产精细管控技术为核心的开发关键技术体系。同时,根据开发中暴露出的问题,梳理总结了在“构造—断裂—应力场”耦合机理、小—微尺度裂缝精细刻画、开发技术政策优化等方面的难点,提出了持续攻关的方向。研究认为:①深层页岩孔隙度、含气量等地质参数与中深层基本相当,但工程参数更复杂,具有地应力高、水平应力差高和破裂压力高的特征,改造难度大;②深层页岩气已在甜点评价与预测、建模—数模一体化技术和精细生产管理等方面形成了关键配套技术,取得了较好的开发效果;③目前深层页岩气主要面临套变、压窜、最终可采储量不达标等方面的难题,需要持续深化地质精细评价、流体运移规律和建模—数模一体化等技术攻关。

     

  • 图  1  川南下志留统龙马溪组压力系数与埋深叠合图

    Figure  1.  Superimposed map of pressure coefficient and burial depth of Lower Silurian Longmaxi Formation in southern Sichuan

    图  2  川南页岩甜点评价与预测技术流程

    Figure  2.  Flow-process chart of shale sweet spot evaluation and prediction technology in southern Sichuan

    图  3  川南永川气田井轨迹方位与无阻流量关系

    Figure  3.  Relationship between well trajectory orientation and absolute open flow rate in Yongchuan gas field in southern Sichuan

    图  4  川南永川气田水平井段长与投资、产值和净现值关系

    Figure  4.  Relationship between horizontal well length and investment, output value, and NPV in Yongchuan gas field in southern Sichuan

    图  5  川南永川气田气井距B级断层距离与无阻流量关系

    Figure  5.  Relationship between the distance from gas wells in Yongchuan gas field to B-level faults and open flow rate, southern Sichuan

    图  6  川南永川气田井距与采出程度、单井EUR关系

    Figure  6.  Relationship between well spacing and recovery degree, single well EUR in Yongchuan gas field in southern Sichuan

    图  7  川南深层页岩气地质工程“四性合一”精细地质分段

    Figure  7.  Fine geological segmentation of "four in one" deep shale gas geological engineering in southern Sichuan

    图  8  川南威荣气田威页25-XHF井闷井排液阶段曲线

    Figure  8.  Shut-in well drainage stage curves of well Weiye 25-XHF in Weirong gas field, southern Sichuan

    图  9  川南威荣、永川深层页岩气定产降压阶段生产管控模式

    Figure  9.  Production control mode of Weirong and Yongchuan deep shale gas during rate-control stages in southern Sichuan

    表  1  川南威荣、永川深层页岩气与涪陵中深层页岩气地质工程参数对比

    Table  1.   Comparison of geological engineering parameters between Weirong, Yongchuan deep shale gas reservoirs and Fuling medium-deep shale gas reservoir, southern Sichuan

    地质工程参数 中深层 深层 对比情况
    涪陵气田 威荣气田 永川气田
    埋深/m 2 400~3 500 3 550~3 880 3 800~4 200 深500~1 500
    TOC大于3%页岩厚度/m 30.5 17.5 20.5 薄10~13
    孔隙度/% 5~7 4.6~6.5 5~6 相当
    含气量/(m3/t) 6~10 5~8 5~9 相当
    沉积微相 硅质深水陆棚 内灰质深水陆棚 外灰质深水陆棚 相带略差
    硅质含量/% 55 38 42 低13~17
    钙质含量/% 10 22 13 高3~12
    黏土含量/% 35 40 45 高5~10
    地压系数 1.35~1.55 1.9~2.0 1.6~2.1 高0.3~0.6
    杨氏模量/GPa 38.4 21.6 26.8 低10~15
    泊松比 0.19 0.23 0.25 高0.04~0.06
    力学脆性指数 0.62 0.43 0.46 低0.16~0.20
    最小水平应力/MPa 48.3~58.4 86~98 90~100 高30~40
    水平应力差/MPa 7.5~8.2 10~16 10~20 高3~12
    破裂压力/MPa 55~70 95~113 91.4~114 高30~40
    下载: 导出CSV

    表  2  川南威荣、永川深层页岩气与涪陵中深层页岩气主要生产动态指标对比

    Table  2.   Comparison of main production performance indicators of Weirong and Yongchuan deep shale gas reservoirs and Fuling medium-deep shale gas reservoir, southern Sichuan

    不同阶段生产动态指标 威荣气田 永川气田 涪陵气田
    排液阶段 初期井口压力/MPa 47.3 52.8 26.5
    最高日排液量/m3 650 420 35
    阶段返排率/% 39 17 4.3
    定产降压 初期产量/(104 m3/d) 7.5 5.5 8
    稳产期/d 120 260 680
    单位压降产气量/(104 m3/MPa) 58.6 51.8 272.4
    稳产期累产气量/(104 m3) 1 983 1 942 6 785
    定压降产 首年递减率/% 64 58 45.2
    返排率/% 85~90 55~60 10~15
    下载: 导出CSV

    表  3  川南威荣、永川深层页岩气排液阶段“五段式”闷排制度

    Table  3.   "Five stage" shut-in drainage system for Weirong and Yongchuan deep shale gas during drainage stage, southern Sichuan

    序号 阶段 时间/d 目的 制度/mm
    1 闷井 5~9 达到渗吸平衡
    2 纯排液 9~15 降低应力敏感性、防支撑剂回流 2~5
    3 见气初期 10~20 降低应力敏感、防裂缝快闭合 5~7
    4 气相突破 12~18 降低地层能量损失 7~9
    5 稳定测试 5~7 获取稳定测试产量及压力 6~8
    下载: 导出CSV

    表  4  川南威荣、永川深层页岩气定产降压阶段生产管控标准

    Table  4.   Rate control standards for Weirong and Yongchuan deep shale gas fields in southern Sichuan

    压力区间/MPa 生产制度/(104 m3/d) 压降速度/(MPa/d) 稳产期/d 单位压降产气量/(104 m3/MPa)
    35~45 6~8 ≤0.12 80 ≥45
    25~35 5~7 ≤0.1 100 ≥50
    20~25 4~6 ≤0.08 60 ≥60
    10~20 4~6 ≤0.05 200 ≥80
    3.5~10 3~5 ≤0.03 220 ≥100
    注:当井口压力下降至20 MPa时,开展下油管作业,以提升气井的携液生产能力。
    下载: 导出CSV
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出版历程
  • 收稿日期:  2023-08-22
  • 修回日期:  2023-10-20
  • 刊出日期:  2023-11-28

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