淀粉接枝共聚物凝胶稳油控水效果及作用机理研究
DOI:
作者:
作者单位:

中国石油青海油田分公司采油一厂采油工艺研究所

作者简介:

通讯作者:

中图分类号:

基金项目:

国家科技重大专项“大型油气田及煤层气开发”(2016ZX05007-002);


Oil stabilization and water control effect of starch graft copolymer gel and its mechanism
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    目前,绝大多数的陆上油田经过长时间注水及注聚开发,储层大孔道或高渗透条带发育,注入水无效低效循环日益严重。本文针对常规调剖堵水剂封堵效果较差的技术难题,以西部B油田储层及流体特征为研究对象,开展了淀粉接枝共聚物凝胶成胶基本性能评价、注入性、封堵性及不同影响因素下稳油控水效果实验研究及机理分析。结果表明,淀粉接枝共聚物凝胶初始黏度较低,注入性较好,但其受成胶空间环境影响较严重,成胶空间越大,成胶强度越高,对高渗岩心的封堵能力强于低渗岩心,此现象表明其对中低渗储层中伤害较小,一定程度上具有选择性封堵的效果。此外,实验中发现淀粉接枝共聚物凝胶并不是注入PV数越多越好,存在一个合理范围,0.1PV时采收率增幅最高,说明随着凝胶注入量的增多,对中低渗的伤害随之增大,反而不利于液流转向的发生。随着顶替段塞注入PV数的增加,采收率逐渐增大,但增幅逐渐减小,“产出/投入”比逐渐降低。淀粉接枝共聚物凝胶的注入时机及岩心非均质性对增油降水效果同样存在影响,注入时机越早,非均质性程度越弱,封堵效果越好,最终采收率增幅越高。

    Abstract:

    At present, the vast majority of onshore oil fields have been developed by water injection and polymer injection for a long time, which leads to the development of large pore channels or high permeability bands, and the ineffective and inefficient circulation of injected water becomes more and more serious. Aiming at the technical problems of poor plugging effect of conventional profile control and water plugging agent, taking the reservoir and fluid characteristics of Western B oilfield as the research object, this paper carried out the basic performance evaluation of starch graft copolymer gel, and studied the mechanism and analysis of oil and water control effect under different factors such as injection, plugging and different influencing factors. The results showed that the initial viscosity of starch graft copolymer gel was low, and the injection was good. However, the gel environment was seriously affected by gelatin. The larger the gelatin space, the higher the gelation strength. The sealing ability of the high permeability core was stronger than that of the low permeability core. This phenomenon indicated that it had less damage to the medium low permeability reservoir and had a selective sealing effect to a certain extent. In addition, it was found that the starch graft copolymer gel was not injected with PV, the more the better, there was a reasonable range. The highest recovery rate was obtained at 0.1PV, which indicated that with the increase of gel dosage, the damage to the medium and low permeability increased, but it was not conducive to the occurrence of fluid diversion. With the increase of PV number injected into the slug, the oil recovery increases gradually, but the increase decreases gradually, and the "output / input" ratio decreases gradually. The injection timing and core heterogeneity of starch graft copolymer gel also have an effect on the effect of increasing oil and precipitation. The earlier the injection time is, the weaker the degree of heterogeneity is, the better the plugging effect is, and the higher the final recovery rate is.

    参考文献
    相似文献
    引证文献
引用本文
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2020-09-21
  • 最后修改日期:2020-10-29
  • 录用日期:2020-12-28
  • 在线发布日期:
  • 出版日期:
点击这里给我发消息

点击这里给我发消息