南翼山油田卤水低温结晶过程研究

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.

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

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 NaCl·2H2O co-precipitate at-23.55 ℃.