石油勘探与开发 >

2022 , Vol. 49 >Issue 2: 348 - 357

DOI: https://doi.org/10.11698/PED.2022.02.13

油气田开发

低渗透储集层表面活性剂胶束溶液助排机理

  • 李俊键 ,
  • 刘奔 ,
  • 郭成 ,
  • 苏航 ,
  • 于馥玮 ,
  • 马梦琪 ,
  • 王利达 ,
  • 姜汉桥
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  • 1.油气资源与探测国家重点实验室（中国石油大学（北京））,北京 102249;
    2.中国石油勘探开发研究院,北京 100083
李俊键（1983-）,男,山东青州人,博士,中国石油大学（北京）石油工程学院教授,主要从事油气渗流机理及提高采收率方面的研究。地址：北京市昌平区府学路18号,中国石油大学（北京）石油工程学院,邮政编码：102249。E-mail:junjian@cup.edu.cn

收稿日期: 2021-07-27

  网络出版日期: 2022-03-16

基金资助

国家科技重大专项（2017ZX05009-005-003）; 中国石油大学（北京）科研基金（2462019QNXZ04）

收起

Mechanisms of water block removal by surfactant micellar solutions in low permeability reservoirs

  • LI Junjian ,
  • LIU Ben ,
  • GUO Cheng ,
  • SU Hang ,
  • YU Fuwei ,
  • MA Mengqi ,
  • WANG Lida ,
  • JIANG Hanqiao
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  • 1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China;
    2. Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China

Received date: 2021-07-27

  Online published: 2022-03-16

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摘要

鉴于针对表面活性剂胶束溶液的研究仍以配方优化和岩心实验为主,且适用于低渗透储集层的助排剂类型及其助排机理尚不明确的现状,在通过岩心实验评价不同类型表面活性剂胶束溶液助排效率的基础上,研制了表征低渗透储集层孔喉结构的多级孔喉系统微观模型,分别开展了盐水及不同盐度表面活性剂胶束溶液在微观模型中的返排实验,直观呈现了表面活性剂胶束溶液作用下微米级孔隙中原油返排的过程,揭示了表面活性剂胶束溶液的助排机理。研究表明,盐水和低盐度表面活性剂胶束溶液驱替及返排过程中均会产生大量小液滴,小液滴通过孔喉时因贾敏效应产生巨大的渗流阻力,导致驱替、返排压差的升高和驱油、返排效率的降低;能够与原油混溶形成Winsor Ⅲ型微乳液的临界盐度和最佳盐度表面活性剂胶束溶液则不会产生大量阻碍流动的小液滴,能够有效降低渗流阻力,提高驱油及返排效率。

关键词： 低渗透储集层; 助排剂; 助排机理; 表面活性剂; 微观可视化实验; 原油返排

本文引用格式

李俊键 , 刘奔 , 郭成 , 苏航 , 于馥玮 , 马梦琪 , 王利达 , 姜汉桥 . 低渗透储集层表面活性剂胶束溶液助排机理[J]. 石油勘探与开发, 2022 , 49(2) : 348 -357 . DOI: 10.11698/PED.2022.02.13

Abstract

The existing researches on surfactant micellar solutions mainly focus on the formulation optimization and core flooding test, and the types and mechanisms of cleanup additives suitable for low permeability reservoir remain unclear. The flowback efficiencies of different types of surfactant micellar solutions were evaluated by core experiments, a multi-level pore-throat system micromodel characterizing pore-throat structures of low permeability reservoir was made, and flooding and flowback experiments of brine and surfactant micellar solutions of different salinities were conducted with the micromodel to show the oil flowback process in micron pores under the effect of surfactant micellar solution visually and reveal the mechanisms of enhancing displacement and flowback efficiency of surfactant micellar solution. During the displacement and flowback of brine and low salinity surfactant micellar solution, many small droplets were produced, when the small droplets passed through pore-throats, huge percolation resistance was created due to Jamin’s effect, leading to the rise of displacement and flowback pressure differences and the drop of flowback efficiency. The surfactant micellar solutions with critical salinity and optimal salinity that were miscible with crude oil to form Winsor Ⅲ micro-emulsion didnot produce mass small droplets, so they could effectively reduce percolation resistance and enhance oil displacement and flowback efficiency.

Key words： low permeability reservoir; cleanup additive; cleanup mechanism; surfactant; microfluidic visualization experiment; crude flowback

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