物理化学学报 >> 2011, Vol. 27 >> Issue (08): 1803-1808.doi: 10.3866/PKU.WHXB20110823

热力学,动力学和结构化学 上一篇    下一篇

南翼山油田卤水低温结晶过程研究

李青海2,3, 顾同欣1, 于升松2, 姚燕2, 李冰2, 李武2   

  1. 1. 中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室, 兰州 730000;
    2. 中国科学院青海盐湖研究所, 西宁 810008;
    3. 中国科学院研究生院, 北京 100049
  • 收稿日期:2011-03-28 修回日期:2011-05-19 发布日期:2011-07-19
  • 通讯作者: 李冰 E-mail:libing@isl.ac.cn
  • 基金资助:

    国家自然科学基金(41073023)和国家十一五科技支撑计划项目(2006BAB09B07)资助

Study on the Precipitation Pathway of Nanyishan Oilfield Brine at Subzero Temperatures

LI Qing-Hai2,3, GU Tong-Xin1, YU Sheng-Song2, YAO Yan2,LI Bing2, LI Wu2   

  1. 1. State Key Laboratory of Frozen Soil Engineering Cold and Arid Regions Environmental & Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000;
    2. Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008;
    3. Graduate University of Chinese Academy of Sciences, Beijing 100049
  • Received:2011-03-28 Revised:2011-05-19 Published:2011-07-19
  • Contact: LI Bing E-mail:libing@isl.ac.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (41073023) and National Science and Technology Pillar Program During the Eleventh Five-Year Plan Period, China (2006BAB09B07).

摘要:

自行设计搭建了一套油田水低温冷冻实验设备, 使用该设备研究了南翼山油田原始卤水在-18.90 °C到-30.90 °C范围内的结冰析盐过程, 精确测量了油田水随温度降低第一种和第二种固相的析出温度. 化学分析得到了该温度范围内Ca2+、Mg2+、K+、Cl-、B2O3、Na+六种常量组分在液相中的含量变化趋势. 使用低温X射线衍射法对原始卤水在低温下得到的固相进行了初步的鉴定, 并对南翼山油田水的低温相变过程进行了实时监测. 实验结果表明: 南翼山油田水降温至-19.10 °C析出第一种盐NaCl·2H2O, 降至-23.55 °C同时析出冰和NaCl·2H2O.

关键词: 油田卤水, 冷冻, NaCl·2H2O, 冰, 低温X射线衍射

Abstract:

The crystallization processes of oilfield brine components from the Nanyishan area at temperature between -18.90 and -30.90 °C were studied by a self-designed refrigeration instrument and the precipitation temperatures of the first and second salts were measured accurately. The concentrations of the major ions (Ca2+, Mg2+, K+, Cl-, B2O3, Na+) in the liquid phase of the brine at different temperatures (from -18.90 to -30.90 °C) were determined by chemical analyses. The solids obtained at low temperature were identified and the phase changes of the oilfield brine at temperatures between -10.0 and -30.0 °C were monitored in situ by subzero temperature X-ray powder diffraction. The results show that the first salt (hydrohalite) precipitates at -19.10 °C and the ice and NaCl·2H2O co-precipitate at -23.55 °C.

Key words: Oilfield brine, Freezing, Hydrohalite, Ice, X-ray diffraction at subzero temperature

MSC2000: 

  • O642