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    莺歌海盆地高温高压气藏水溶气释放对气水界面的影响

    马勇新 肖前华 米洪刚 戚志林 黄小亮 任星明

    马勇新, 肖前华, 米洪刚, 戚志林, 黄小亮, 任星明, 2017. 莺歌海盆地高温高压气藏水溶气释放对气水界面的影响. 地球科学, 42(8): 1340-1347. doi: 10.3799/dqkx.2017.527
    引用本文: 马勇新, 肖前华, 米洪刚, 戚志林, 黄小亮, 任星明, 2017. 莺歌海盆地高温高压气藏水溶气释放对气水界面的影响. 地球科学, 42(8): 1340-1347. doi: 10.3799/dqkx.2017.527
    Ma Yongxin, Xiao Qianhua, Mi Honggang, Qi Zhilin, Huang Xiaoliang, Ren Xingming, 2017. Influence of Water-Soluble Gas Releasing on Gas-Water Interface for Yinggehai Basin High Temperature and Overpressured Gas Field. Earth Science, 42(8): 1340-1347. doi: 10.3799/dqkx.2017.527
    Citation: Ma Yongxin, Xiao Qianhua, Mi Honggang, Qi Zhilin, Huang Xiaoliang, Ren Xingming, 2017. Influence of Water-Soluble Gas Releasing on Gas-Water Interface for Yinggehai Basin High Temperature and Overpressured Gas Field. Earth Science, 42(8): 1340-1347. doi: 10.3799/dqkx.2017.527

    莺歌海盆地高温高压气藏水溶气释放对气水界面的影响

    doi: 10.3799/dqkx.2017.527
    基金项目: 

    十三五国家油气重大专项 2017ZX05013-001

    重庆市教委科学技术研究项目 KJ1601333

    国家自然科学基金项目 51374296

    重庆市教委科学技术研究项目 KJ1601313

    国家自然科学基金项目 51604053

    中海油综合科研项目 YXKY-20XZJ-01

    重庆市基础与前沿研究计划项目 cstc2016jcyjA0126

    详细信息
      作者简介:

      马勇新(1972-), 男, 高级工程师, 主要从事油气田开发研究

      通讯作者:

      肖前华

    • 中图分类号: P641.2

    Influence of Water-Soluble Gas Releasing on Gas-Water Interface for Yinggehai Basin High Temperature and Overpressured Gas Field

    • 摘要: 莺歌海盆地X区属于高温高压气藏,水溶气含量大,水溶气释放对气水界面及水侵规律的影响不明.通过PVT物性分析仪,采用复配的天然气和地层水测试了X区不同区块水溶气溶解度变化规律.设计可视化填砂管实验,探索了水溶气释放对气水界面的影响规律.研究表明:水溶气溶解度受温度、压力、地层水矿化度和天然气组分的影响,随压力的增大逐渐增大,随温度的增大先减小后增大,拐点温度为80~90℃,地层温压条件下(145℃,54 MPa)X-1区块水溶气含量为22.5 m3/m3,X-2区块为8.7 m3/m3.可视化填砂管实验研究表明:衰竭开采过程中,水溶气不断释放且携带地层水运移,同时在地层水自身泄压及毛管力作用下,气水界面明显上升.在此基础上,数值模拟气藏衰竭开采表明:水溶气溶解度越大气水界面上升越快,气井见水越早.预测期10 a中,考虑水溶气时,X-1区要早800 d见水,平面上推进快800 m,纵向上推进快7.3 m;X-2要早300 d见水,平面上推进快近500 m,纵向上推进快7.0 m.

       

    • 图  1  水溶气含量测试流程

      Fig.  1.  Experimental procedure

      图  2  LXQ-Ⅱ型高温高压可视化PVT仪(a)及其视窗(b)

      Fig.  2.  PVT apparatus (LXQ-Ⅱ) (a) and its windows (b)

      图  3  水溶气含量随压力的变化规律

      Fig.  3.  Relationship between experimental water-soluble gas content and pressure

      图  4  地层压力下水溶气含量随温度的变化规律

      Fig.  4.  Relationship between experimental water-soluble gas content and temperature

      图  5  水溶气含量影响因素分析

      付晓泰等(1996)

      Fig.  5.  Influence factors analysis for water-soluble gas content

      图  6  降压衰竭过程气液界面变化实验监测

      Fig.  6.  Gas-water interface changing characteristics during depletion-drive development

      图  7  X-1区块地层水分布剖面

      Fig.  7.  Profile of X-1 formation water

      图  8  X-2区块地层水分布剖面

      黑、白圈为左右两图显著变化的区域

      Fig.  8.  Profile of X-2 formation water

      表  1  X区天然气组分

      Table  1.   Gas composition of X area

      区块 组分(%)
      C1 C2 C3 IC4 NC4 IC5 NC5 C6PLUS CO2 N2 H2
      X-1 67.10 0.90 0.30 0.07 0.07 0.03 0.02 0.07 23.64 7.81
      X-2 85.05 1.46 0.85 0.26 0.24 0.13 0.07 0.24 3.48 8.21 0.01
      下载: 导出CSV

      表  2  X区地层水分析数据

      Table  2.   Formation water composition of X area

      区块 阳离子(mg/L) 阴离子(mg/L) 总矿化度(mg/L) 水型
      K++Na+ Ca2+ Mg2+ Cl- SO42- HCO3- CO32-
      X-1 5 077 35 8 5 955 125 3 207 未检出 14 406 NaHCO3
      X-2 5 652 40 17 6 402 1 300 2 539 未检出 15 950 NaHCO3
      下载: 导出CSV

      表  3  X-1区不同水溶气状态下气井见水时间预测

      Table  3.   Water breakthrough time prediction for X-1 area

      区块 井号 见水时间(d) 累产气(108 m3)
      Rs=22.5 Rs=0 Rs=22.5 Rs=0
      X-1 F1 797 1 598 5.82 6.92
      F3 2 794 未见水 7.93 9.34
      F4 2 602 未见水 13.27 14.76
      F5 3 540 未见水 13.43 14.09
      下载: 导出CSV

      表  4  X-2区不同水溶气状态下气井见水时间预测

      Table  4.   Water breakthrough time prediction for X-2 area

      区块 井号 见水时间(d) 累产气(108 m3)
      Rs=8.7 Rs=0 Rs=8.7 Rs=0
      X-2 A1H 2 340 未见水 26.44 26.88
      A4 900 1 384 25.66 25.28
      A6 3 340 未见水 48.78 47.08
      A8H 960 1 237 23.75 25.22
      B1H 720 1 167 21.16 20.54
      B6H 1 980 2 786 18.93 19.81
      下载: 导出CSV
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