南翼山油田卤水低温结晶过程研究  

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

作　　者：李青海[1,2] 顾同欣[3] 于升松[1] 姚燕[1] 李冰[1] 李武[1] 

机构地区：[1]中国科学院青海盐湖研究所,西宁810008 [2]中国科学院研究生院,北京100049 [3]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

出　　处：《物理化学学报》2011年第8期1803-1808,共6页Acta Physico-Chimica Sinica

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

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NaC.l2H2O,降至-23.55°C同时析出冰和NaC.l2H2O.The crystallization processes of oilfield brine components from the Nanyishan area at temperature between -18.90 and -30.90 ℃ 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＋, CI-, B2O3, Na＋） in the liquid phase of the brine at different temperatures （from -18.90 to -30.90 ℃） 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 ℃ were monitored in situ by subzero temperature X-ray powder diffraction. The results show that the first salt （hydrohalite） precipitates at -19.10 ℃ and the ice and NaCI. 2H2O co-precipitate at -23.55 ℃.

关 键 词：油田卤水 冷冻 NaCl·2H2O 冰 低温X射线衍射 

分 类 号：TS392[轻工技术与工程]