静、动态条件下Na_2CO_3在油砂中的损耗

THE STATIC AND DYNAMIC CONSUMPTION OF Na 2SO 3 WITH OILY SAND

采用静态与动态实验方法研究了Ｎａ２ＣＯ３水溶液与油砂、高岭土、蒙脱土、钾长石、斜长石、石英砂反应时Ｎａ２ＣＯ３的损耗和溶液中各种离子浓度的变化。结果表明，Ｎａ２ＣＯ３溶液与油砂反应时溶液中Ｋ＋、ＳｉＯ２－３浓度升高，Ｃａ２＋、Ｍｇ２＋浓度降低。油砂在Ｎａ２ＣＯ３溶液中溶解及再沉淀是一个动态过程。地层水的硬度会影响碱耗量。

The alkali (Na 2CO 3) consumption is studied in static reactions of alkali solutions with oil ysand from Block Xin 28,Liaohe,and its mineral components in 8 12 hrs and in a month and in dynamic reactions (sand pack flow tests)over 9 months followed by determing K +,Ca 2+ ,Mg 2+ and Al 3+ concentrations in the reacted alkali solutions.The most damageable minerals are montmorillonite and kaolinite.After being reacted with oily sand,the concentrations of K +and SiO 2- 3 in the alkali solutions are increased and that of Ca 2+ and Mg 2+ decreased.The dissolving out from the sand of some components and reprecipitation of others are shown to be dynamical proceesses.Ca 2+ and Mg 2+ in reservoir brine may alter the alkali consumption notably.For 1% Na 2CO 3 solution,the alkali consumption is 5.7 g per kg real oily sand and 5.3 g per kg artificial oily sand.