首页> 外文学位 >A study of fluid-carbonate rock interaction and the kinetics of chromium precipitation.
【24h】

A study of fluid-carbonate rock interaction and the kinetics of chromium precipitation.

机译:流体-碳酸盐岩相互作用和铬沉淀动力学的研究。

获取原文
获取原文并翻译 | 示例

摘要

The application of gelled polymer treatments by injecting gelable crosslinker-polymer solutions to change the flow characteristics of a reservoir is a viable improved oil recovery technique. To design successful treatments, it is necessary to understand the interactions between the injected solutions and the rock materials. These chemical interactions include the dissolution of rock, the changes of pH and composition in the injected solution, and the precipitation of chromium hydroxide due to the increase of solution pH.; The first part of this research was undertaken to investigate the effects of initial pH, common ion, and acetate buffer on the change in the pH and concentrations in the injected solution. A three-stage effluent pH behavior was observed when the pH of the injected solution increased from 1 to 13. Added common ions such as calcium and magnesium depressed the dissolution of dolomite and resulted in a lower equilibrium pH. The presence of acetate ions enhanced the dissolution of dolomite, but reduced the rate of pH increase and buffered the solution on a lower pH level.; The second part of this research studied the chemical nature of chromium hydroxide precipitation from chromium acetate solutions by investigating the effects of pH, salinity, temperature, acetate ligand concentration, the source of chromium, and salt type on the precipitation under constant pH titration. An induction period was observed, which decreased exponentially with the increase of temperature, salinity, or solution pH. The precipitation reactions were accelerated with increase in pH, temperature, salinity, and decelerated with an increase in acetate concentration. A kinetic model was developed to describe both the induction period and the rate of precipitation of chromium from a chromium acetate solution in 1% KCl at 25°C for the pH range of 7–10 with OAc to Cr ratios between 3 and 9.; A mathematical model was developed to simulate the chemical interaction between various solutions and dolomite. The proposed model predicts (1) aqueous electrolyte reactions, (2) dissolution of dolomite, (3) precipitation of chromium hydroxide, and (4) polymer gelation time (in Appendix A). The predicated results compared favorably with both experimental results and published models.; The results of this research lead to a better understanding on the chemical interactions between chromium solutions and dolomite rocks. It provides useful information for gel treatments used for in-depth permeability modification in carbonated reservoirs.
机译:通过注入可胶凝的交联剂-聚合物溶液以改变储层的流动特性来应用胶凝的聚合物处理是一种可行的改进的采油技术。为了设计成功的处理方法,必须了解注入的溶液与岩石材料之间的相互作用。这些化学相互作用包括岩石的溶解,注入溶液中pH值和组成的变化,以及由于溶液pH值增加引起的氢氧化铬沉淀。本研究的第一部分旨在研究初始pH,常见离子和醋酸盐缓冲液对pH值和注入溶液浓度的变化的影响。当注入溶液的pH从1增加到13时,观察到了三阶段流出物的pH行为。添加诸如钙和镁的常见离子会抑制白云石的溶解,并导致较低的平衡pH。乙酸根离子的存在增强了白云石的溶解,但降低了pH的增加速率,并在较低的pH值水平上缓冲了溶液。本研究的第二部分通过研究在恒定pH滴定条件下pH,盐度,温度,乙酸盐配体浓度,铬的来源和盐类型对沉淀物中乙酸铬溶液中氢氧化铬沉淀的化学性质的影响。观察到诱导期,该诱导期随温度,盐度或溶液pH的增加呈指数下降。随着pH,温度,盐度的增加,沉淀反应加速,而随着乙酸盐浓度的增加,沉淀反应减速。建立了动力学模型,描述了在pH为7-10的OAc与Cr之比为3至9的条件下,乙酸铬在25%的1%KCl中从乙酸铬溶液中析出铬的诱导期和析出速率。建立了数学模型来模拟各种溶液与白云石之间的化学相互作用。拟议的模型预测(1)电解质反应,(2)白云石的溶解,(3)氢氧化铬的沉淀和(4)聚合物胶凝时间(在附录A中)。预测的结果与实验结果和已发布的模型相比均令人满意。这项研究的结果使人们对铬溶液和白云石岩石之间的化学相互作用有了更好的了解。它为用于碳酸盐岩储层的深度渗透率改造的凝胶处理提供了有用的信息。

著录项

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