石油学报 ›› 2013, Vol. 34 ›› Issue (2): 334-339.DOI: 10.7623/syxb201302016

• 油田开发 • 上一篇    下一篇

页岩储层防水锁微乳液的制备与性能

邱正松 1   逄培成 1,2   黄维安 1   高宏松 1   刘均一 1   

  1. 1.中国石油大学石油工程学院 山东青岛 266580; 2.中海油田服务股份有限公司油田化学事业部 河北燕郊 065201
  • 收稿日期:2012-08-31 修回日期:2012-12-27 出版日期:2013-03-25 发布日期:2013-01-31
  • 通讯作者: 黄维安,男,1976年8月生,2007年获中国石油大学(华东)博士学位,现为中国石油大学(华东)副教授,主要从事油气井化学工程方向科研和教学工作。
  • 作者简介:赵邦六,男,1963年10月生,1985年毕业于长春地质学院应用地球物理专业,现为中国石油天然气股份有限公司勘探与生产分公司总工程师、教授级高级工程师,主要从事油气勘探工作。Email:blzhao@petrochina.com.cn
  • 基金资助:

    国家自然科学基金重点项目(No.51034007)、国家自然科学基金项目(No.41072094)、中央高校基本科研业务费专项资金项目(10CX04010A)以及教育部海洋油气井钻完井理论与工程创新团队项目(IRT1086)资助。

Preparation and performance of anti-waterblock microemulsion for shale reservoirs

QIU Zhengsong 1   PANG Peicheng 1,2   HUANG Wei’an 1   GAO Hongsong 1   LIU Junyi 1   

  • Received:2012-08-31 Revised:2012-12-27 Online:2013-03-25 Published:2013-01-31

摘要:

针对目前页岩气储层开采过程中普遍存在的水锁伤害难题,以Gemini季铵盐型表面活性剂GTN+Tween80-正丁醇-正辛烷-水为主要原料,制备了新型微乳液防水锁剂ME-1和ME-2,并对双连续区域内临界O/W(水包油)和W/O(油包水)边界处微乳液稀释形成不同浓度纳米乳液的防水锁性能进行了研究。根据页岩储层超低渗特性,对ME-1和ME-2不同加量所形成的纳米乳液体系开展了表面张力、接触角、粒度分布、膨胀抑制性以及岩心自吸等性能评价实验,探讨了其防水锁机理,其中1.0%ME-2效果最佳。研究表明,新型微乳液防水锁剂能够有效降低体系表面张力,增大与页岩的接触角,减弱孔喉水化膨胀缩径效应,最终降低外来流体侵入储层孔喉的毛管力,同时可以多形态变形挤入微孔缝中,阻挡水分子侵入,阻缓压力传递,大幅降低页岩储层岩心自吸水量,有效减少液相圈闭及水锁伤害,有利于页岩气储层保护。

关键词: 页岩气储层, 微乳液, 纳米乳液, 防水锁, 储层保护

Abstract:

In view of serious damage caused by waterblock prevalent during the exploitation process of shale gas reservoirs, two novel anti-waterblock microemulsion agents, ME-1 and ME-2, were developed by employing Gemini hyamine surfactant GTN plus Tween 80, n-butyl alcohol, n-octane and water as major raw materials. Anti-waterblock behaviors of these two microemulsion agents with different concentrations in critical O/W and W/O boundaries within bicontinuous districts were examined. Based on ultra-low permeability of shale reservoirs, we evaluated various properties of nanoemulsion systems obtained by diluting the microemulsion agents into surfactants with different concentrations, such as surface tension, contact angle, distribution of micelle size, anti-swelling ability and spontaneous imbibition of rocks. The results showed that the novel microemulsion agents could effectively reduce the surface tension of fluids, increase contact angle with shale, weaken pore throat shrinkage caused by hydrous swelling, and finally decrease the capillary pressure of pore throats caused by the incursion of allothigenous fluids upon reservoirs. Simultaneously, micelle could deform and squeeze into micropores, block water incursion and slow down transmission of pressure. All of the effects of microemulsion agents can substantially decrease liquid spontaneous imbibition of rocks and effectively reduce aqueous-phase traps and waterblock damage. Therefore, the novel anti-waterblock microemulsion agents are conducive to the protection of shale gas reservoirs.

Key words: shale gas reservoir, microemulsion; nanoemulsion; anti-waterblock; reservoir protection