西南石油大学学报(自然科学版)

• 油气化学工程 • 上一篇    下一篇

砂岩储层酸化智能复合酸液体系研究及应用

刘平礼1 *,孙庚2,邢希金3,潘亿勇4,赵立强1   

  1. 1.“油气藏地质及开发工程”国家重点实验室·西南石油大学,四川成都610500;
    2. 中国石化西北油田分公司采油三厂,新疆库车841000;
    3. 中海石油研究总院,北京朝阳100028;4. 中海石油(中国)有限公司天津分公司,天津塘沽300450
  • 出版日期:2015-12-01 发布日期:2015-12-01
  • 通讯作者: 刘平礼,E-mail:liupingli@vip.163.com
  • 基金资助:

    国家重大专项(2011ZX05030 005)。

Study and Application of Intelligent Integrated Acid System for#br# Sandstone Stimulation

Liu Pingli1*, Sun Geng2, Xing Xijin3, Pan Yiyong4, Zhao Liqiang1   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China
    2. No.3 Oil Production Plant Northwest Oilfield Branch,SINOPEC,Kuqa,Xinjiang 841000,China
    3. CNOOC Research Institute,Chaoyang,Beijing 100028,China
    4. Tianjin Branch,CNOOC(China)Co. Ltd.,Tanggu,Tianjin 300450,China
  • Online:2015-12-01 Published:2015-12-01

摘要:

常规砂岩酸化为了实现有效解堵,必须采用前置液、处理液和后置液多段液体,其作业程序复杂,研制出一套
智能复合酸液体系InteAcid。该酸液能替代常规砂岩酸化的多段酸液,实现单步酸化,显著简化作业程序,特别适
合于海上酸化作业。室内实验表明,InteAcid 在溶解砂岩矿物和解除伤害的同时,能有效抑制二次沉淀,对金属氟化
物、氟硅/铝酸盐和金属氢氧化物沉淀抑制率可分别达到71.81%、70.51% 和78.59%;单步岩芯流动实验后,无伤害、轻
微伤害、重度伤害岩芯渗透率提高为原始渗透率的1.35 倍、3.60 倍和15.00 倍;酸处理后孔隙结构微观分析表明,该酸
液具有提高岩芯渗透率和稳定黏土作用,对岩石骨架破坏很小。该酸液现场单步酸化11 口注水井,成功率100%,效
果显著率达90%。

关键词: 智能酸化, 单步, 二次沉淀, 螯合

Abstract:

By use of preflush,treating fluid,over-flush and diverter,conventional sandstone acidizing treatment could effectively
break down formation and prevent the secondary precipitation,which is very complicated. To overcome the shortage of
conventional sandstone acidizing,InteAcid is developed. Through the use of InteAcid,single-step acidizing can be realized,
instead of using conventional sandstone acidizing. Single-step acidizing could significantly simplify the acidizing stimulation
process,which can be widely used for offshore well acidizing. The experimental data shows that InteAcid could not only
dissolve sandstone mineral and remove well damage effectively,but also prevent secondary precipitation excellently,especially
for metal fluoride precipitation(the inhibition ratio is 71.81%),fluosilicate/aluminate precipitation(the inhibition ratio is
70.51%)and metal hydroxides(the inhibition ratio is 78.59%). After treated by single-step acidizing,the original permeability
of non-damage core,slight-damage core and severe-damage core have been improved to 1.35times,3.6 times and 15 times
respectively. The micro pore structure analysis result shows that InteAcid can stabilize clay and almost never damage the rock
structure while improving the core permeability. 11 in-situ injection well have been stimulated by single-step acidizing. The
success rate is 100% and 90 percent of these wells have been improved obviously,of which the injection index is increased
largely and the pressure declines notably.

Key words: intelligence aciding, single step, secondary precipitation, chelating

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