耐高温沉淀型无机硅酸盐堵剂体系研究

Research on heat resistant precipitated plugging agents based on inorganic silicate

围绕沉淀型无机硅酸盐堵剂体系开展实验,考察了Ca2＋ （Mg2＋）、矿化度、温度及水玻璃浓度对沉淀生成量的影响,得到钙（镁）双液法堵剂体系和充分利用地层矿化度的“盐敏效应”堵剂体系在内的2种堵剂体系,优化设计配方分别为“12％～15％的SBL-1水玻璃＋4％～5％的CaCl2（或MgCl2）溶液”和“15％的SBL-1水玻璃＋15×104 mg/L的NaCl溶液”;优选体系配方至少可耐200℃以上的高温,具有较好的封堵能力,封堵率大于96％,满足高温高盐油藏调剖堵水作业的要求.

Concentration of Ca2 ＋ （Mg2 ＋）,salinity,temperature and types of sodium silicate were studied based on inorganic silicate.Two plugging agent systems were obtained——plugging agents with Ca2＋（Mg2＋） using double-fluid method and plugging agents in use of salt sensitivity.The optimized formulations were respectively 12％ ～ 15％ SBL-1 water-free glass with 4％ ～ 5％ CaCl2 （or MgCl2） and 15％SBL-1 water-free glass with 15 × 104 mg/L NaCl.The systems selected could both stand the temperature of 200 ℃ and results of core plugging experiments showed good shut off capacity,with a plugging rate of 96％,which effectively meet the demands of profile control and water shut off high temperature and high salinity reservoirs.