西南石油大学学报(自然科学版)

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低渗透油藏水锁伤害机理及解水锁实验研究

1. 中国地质大学博士后流动站,北京海淀100083
2. 中国石化河南油田分公司勘探开发研究院,河南南阳473400   

  1. 1. 中国地质大学博士后流动站,北京海淀100083
    2. 中国石化河南油田分公司勘探开发研究院,河南南阳473400
  • 出版日期:2013-06-01 发布日期:2013-06-01
  • 作者简介:杨永利,1967 年生,男,汉族,内蒙 古丰镇人,高级工程师,在站博士 后,主要从事开发技术和管理工 作。E-mail:26706381@qq.com

Study of Water Locking Damage Mechanism and Water Unlocking of Low
Permeability Reservoir

1. Postdoctoral Research Station,China University of Geosciences,Haidian,Beijing 100083,China
2. Exploration and Development Research Institute,Henan Oilfield Company,Nanyang,Henan 473400,China   

  1. 1. Postdoctoral Research Station,China University of Geosciences,Haidian,Beijing 100083,China
    2. Exploration and Development Research Institute,Henan Oilfield Company,Nanyang,Henan 473400,China
  • Online:2013-06-01 Published:2013-06-01

摘要:

针对地层压力低(压力系数小于1)、油井含水率低(小于50%)的低渗油井,水锁伤害普遍存在的问题,研究
了毛细管效应和贾敏效应对产生水锁现象的机理认识。通过实验数据结果分析,得到了水锁现象与渗透率的关系,
即:渗透率越低,水锁程度越严重,10.00 mD 以下的岩芯,压力升高值基本在25% 左右,而大于10.00 mD 的岩芯压力
升高值在15% 左右。注入表面活性剂后,解除水锁效果非常明显,特别是渗透率越低,效果越明显,最高驱替压力值
下降幅度达到了近50%。说明表面活性剂对解水锁具有很好的效果。

关键词: 水锁, 低渗透, 储层伤害, 表面活性剂

Abstract:

Water locking phenomenon is the typical of low and extra low permeability reservoir. Which is a common problem
in low permeability oil wells,and is of low formation pressure(pressure coefficient less than 1)and of low water cut(less than
50%). Capillary effect and Jiamin effect is the main mechanism of the occurrence of water locking phenomenon. Through
experimental analysis we find out that the lower the permeability is,the worse the water locking degree is. The pressure of the
core which is less than 10 mD rise about 25%. But the pressure of the core which is more than 10 mD rise about 15%. The
injection of a surfactant displayed remarkable water unlocking effect,especially when the permeability is low,and the maximum
displacement value of pressure drops by almost 50%,which proves that surfactant is very effective in water unlocking.

Key words: water locking, low permeability, reservoir damage, surfactant