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℃到-30.90 ℃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℃析出第一种盐NaCl·2H2O,降至-23.55℃同时析出冰和NaCl·2H2O.%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+,Cl-, 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 ℃.
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