• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Enhancing the spontaneous imbibition process in naturally fractured reservoirs through wettability alteration using surfactants: Mechanistic study and feasibility of using biosurfactants produced from agriculture waste streams.
【24h】

Enhancing the spontaneous imbibition process in naturally fractured reservoirs through wettability alteration using surfactants: Mechanistic study and feasibility of using biosurfactants produced from agriculture waste streams.

机译：通过使用表面活性剂的润湿性改变来增强天然裂缝性储层的自发吸收过程：机理研究和使用由农业废水产生的生物表面活性剂的可行性。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Naturally fractured reservoirs are characterized by having low-permeability matrix blocks surrounded with fractures of high hydraulic conductivity. Waterflooding process in such reservoirs is successful if the matrix blocks holding the dominant fraction of the reservoir porosity are able to imbibe the injected water (water-wet) and expel the oil into the fracture system and finally to the production well. This mechanism referred to as spontaneous imbibition of water into the matrix blocks is an efficient method to increase oil recovery from fractured reservoirs. However, most naturally fractured reservoir rocks are mixed- to oil-wet and do not imbibe the injected water, which translates into low-efficiency waterflood recovery. To enhance the spontaneous imbibition process, low concentration of surfactants is dissolved into the injected water to induce wettability alteration of the reservoir rock by changing the wettability of the rock toward a more water-wet state. This is the main subject of this research study. The first part of this study was devoted to evaluating and comparing the effectiveness of using a biosurfactant (surfactin) produced from agriculture waste streams against a benchmark chemical surfactant in mediating the wettability of oil-wet rocks. The ability of surfactants to enhance the spontaneous imbibition process in cleaned and crude oil-aged reservoir core plugs was tested. One of the other factors that needs to be considered is the estimation of the loss of surfactants due to adsorption onto the reservoir rock, because for the process to be effective, the injected surfactant solution should be able to penetrate deep into the reservoir. So, in this work, static and dynamic adsorption isotherms for both biosurfactant and benchmark chemical surfactants on crushed reservoir rocks and reservoir core plugs were generated and compared. The second part of the study focused on the mechanistic study of wettability alteration by surfactants. There are two main mechanisms proposed for the wettability alteration process, but none have been verified. This study is focused on investigating the wettability alteration mechanisms though experimental observations. The results of the work will provide better guidelines in designing and improving water flood performance in naturally fractured reservoirs. It was verified that wettability alteration is caused by either surfactant adsorption or the ion-pair formation between the surfactant monomer and the material adsorbed on the reservoir rock from exposure to crude oil. It was further demonstrated that the ion-pair process can be improved by increasing the charge density of the head-group in the surfactant molecule.
机译：天然裂缝性储层的特征是具有低渗透性的基质块，周围是高导水率的裂缝。如果保持储层孔隙度占主导地位的基质块能够吸收注入的水（水湿）并将油排入压裂系统，最后进入生产井，那么此类储层的注水工艺将是成功的。这种被称为水自发吸收到基质块中的机制是增加从裂缝性储层中采油的有效方法。但是，大多数自然裂缝的储集岩都是混油润湿的，不会吸收注入的水，这转化为低效率的注水采收。为了增强自发吸收过程，将低浓度的表面活性剂溶解在注入的水中，以通过将岩石的润湿性改变为更湿润的状态来诱导储层岩石的润湿性改变。这是本研究的主题。本研究的第一部分致力于评估和比较使用农业废水中产生的生物表面活性剂（表面活性素）与基准化学表面活性剂介导油湿岩石的润湿性的有效性。测试了表面活性剂增强清洁和原油老化的油藏岩心塞中自发吸收过程的能力。需要考虑的其他因素之一是由于吸附到储层岩石上而导致的表面活性剂损失的估算，因为要使该过程有效，注入的表面活性剂溶液应能够深入到储层中。因此，在这项工作中，生成并比较了生物表面活性剂和基准化学表面活性剂在破碎储层岩石和储层芯塞上的静态和动态吸附等温线。研究的第二部分侧重于表面活性剂改变润湿性的机理。对于润湿性改变过程，提出了两种主要机理，但尚未验证。这项研究集中于通过实验观察来研究润湿性改变的机理。这项工作的结果将为设计和改善天然裂缝水库的水驱性能提供更好的指导。证实了润湿性改变是由于表面活性剂的吸附或表面活性剂单体与由于暴露于原油而吸附在储层岩石上的材料之间的离子对形成引起的。进一步证明，可以通过增加表面活性剂分子中的头基的电荷密度来改善离子对过程。

著录项

  • 作者

    Salehi, Mehdi.;

  • 作者单位

    University of Kansas.;

  • 授予单位 University of Kansas.;
  • 学科 Engineering Petroleum.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 236 p.
  • 总页数 236
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 石油、天然气工业;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号