西南石油大学学报(自然科学版) ›› 2012, Vol. 34 ›› Issue (1): 90-96.

• 石油与天然气工程 • 上一篇    下一篇

强敏感性低渗透储层的改造模拟实验初探

操应长,远光辉,葸克来   

  1. 中国石油大学(华东)地球科学与技术学院,山东青岛266555
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2012-02-01 发布日期:2012-02-01

Preliminary Discussion of Improvement Experiments on StrongSensitivity–Low Permeability Reservoir

Cao Yingchang, Yuan Guanghui, Xi Kelai   

  1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu Sichuan 610500,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2012-02-01 Published:2012-02-01

摘要: 准噶尔盆地北三台地区白垩系储层中低渗透储层占73.11%,储层中粘土矿物以蒙脱石及无序伊/蒙混层矿物
为主,高岭石、绿泥石和伊利石整体含量较低,但局部富集。室内敏感性实验分析表明:研究区低渗透储层具有敏感性
复杂、多种敏感性共存的特征,敏感性尤以水敏最强,是造成主力油层低产、无产的直接原因。酸敏实验表明:常规土
酸酸化不能有效改善研究区的储层物性,也不能有效降低储层水敏性。针对研究区储层具体特征,筛选配制了配方
为8% 盐酸+2% 醋酸+2% 氟化铵+1.5% 粘土稳定剂A+2% 铁离子稳定剂TLJ 的复合解堵液。模拟地层温度、压力条
件,进行了水敏样品的解堵改造实验和原样提高渗透率实验,结果表明:对于蒙脱石及伊/蒙混层矿物相对含量高、绿
泥石相对含量低的储层,该复合解堵液具有较好的解堵效果和物性改良作用。

关键词: 准噶尔盆地, 低渗透储层, 敏感性, 复合解堵液, 改造实验

Abstract: In Beisantai area,Junggar Basin,73.11 percent of Cretaceous reservoir is low permeability reservoir. Clay minerals
in Cretaceous reservoir are mainly montmorillonite and disordered illite-montmorillonite. Kaolinite,chlorite and illite are at
lower levels overall,but local enrichment. Results of sensitivity experiments show that reservoir sensitivity of study area is
complex,a variety of sensitivity coexist and directly lead to low-yielding of oil reservoir. Water sensitivity is most strong.
Acid sensitivity experiments indicate that mud acid can’t improve reservoir quality and reduce reservoir water sensitivity effectively.
According to specific reservoir property of study area,composite plug removal liquid with prescription of 8%HCl,
2%CH3COOH,2%NH4F,1.5%clay stabilizer A,2%ferric iron stabilizer TLJ is confected. Plug removal experiments of water
sensitivity samples and permeability improvement experiments of natural core samples are conducted under conditions with
stimulated actual formation temperature and pressure. Results show that the composite plug removal liquid is valid in plug
removal and permeability improvement on reservoir with high montmorillonite and illite-montmorillonite relative content but
low chlorite relative content.

Key words: Beisantai area, Cretaceous, low permeability reservoir, reservoir sensitivity, composite plug removal liquid, improvement experiment

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