摘要
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5μm,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231×10-3μm2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。
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^-3μm2was 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.
作者
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(Downhole Operation Branched Company,CNPC Bohai Drilling and Exploration Engineering Company,Ltd.,Renqiu,Hebei 062550,P R of China;College of Chemistry and Chemical Engineering,Southwest Petroleum University,Chengdu,Sichuan 610500,P R of China)
出处
《油田化学》
CAS
CSCD
北大核心
2018年第4期648-653,共6页
Oilfield Chemistry
基金
中国石油集团渤海钻探工程有限公司指导性项目"酸化压裂纳米级暂堵转向技术研究技术开发"(项目编号2016ZD08K-04)
关键词
暂堵剂
氯化钠
氯化钙
性能评价
temporary plugging agent
sodium chloride
calcium chloride
performance evaluation
