氯化钠暂堵剂的制备与性能评价

Preparation and Performance Evaluation of Sodium Chloride Temporary Plugging Agent

陈 清 白田增 王艺之 王 航 杨 永 杨志英 柯 强

CHEN Qing BAI Tianzeng WANG Yizhi WANG Hang YANG Yong YANG Zhiying KE Qiang

为获得对地层伤害小和成本低的暂堵剂，用分散剂十二烷基磺酸钠（SDS）、缓蚀剂钼酸钠、稳定剂黄原胶、氯化钠、沉淀剂氯化钙和除氧剂亚硫酸钠制得水溶性氯化钠暂堵剂。优选了各添加剂的加量，研究了水溶性氯化钠暂堵剂的转向性、封堵性和解堵性等。结果表明，用 0.1 g SDS、1.0 g钼酸钠、0.35 g黄原胶、18.0 g氯化钠、25.0 g氯化钙和亚硫酸钠制得的水溶性氯化钠暂堵剂稳定性较好，12 d内不分层。90℃下氯化钠暂堵剂对 N80钢的腐蚀速率为 0.067 mm/a，低于行业标准 0.075 mm/a。氯化钠暂堵剂颗粒平均粒径约 5 μm，固含量为 6.96%。氯化钠暂堵剂的转向能力、封堵性能和解堵性能较好，注入量为1 PV时对渗透率为231×10-3 μm2填砂管的封堵率为95.6%、解堵率为96.2%。氯化钠暂堵剂降低了作业成本和环境污染，可用于低渗透裂缝油藏驱油。图8表4参12

In order to obtain temporary plugging agent with small formation damage and low cost，water-soluble sodium chloride temporary plugging agent was synthesized by dispersant sodium dodecyl sulfate（SDS），corrosion inhibitor sodium molybdate，stabilizer xanthan gum，sodium chloride，precipitator calcium chloride and deoxidizer sodium sulfite. The dosages of additives were optimized and the performances of the new temporary plugging agent，including steering，plugging and plugging removal properties were studied. The results showed that the temporary plugging particle synthesized by 0.1 g SDS，1.0 g sodium molybdate，0.35 g xanthan gum，18.0 g sodium chloride，25.0 g calcium chloride and sodium sulfite had good stability without stratification within 12 days. The corrosion rate of N80 steel by temporary plugging agent was 0.067 mm/a at 90℃，which was lower than that of industry standard（0.075 mm/a）. The average particle size of temporary plugging agent was about 5 μm and the solid content of that was 6.96% . Sodium chloride temporary plugging agent had good steering ability，plugging and plugging removal performance. When the injection volume was 1 PV，the plugging rate of sand filling pipe with permeability of 231×10-3 μm2 was 95.6% ，and the plugging removal rate was 96.2% . NaCl temporary plugging agent could reduce operating costs and environmental pollution，and could be used for the oil displacement in low permeability fractured reservoirs.