Preparation and Properties of Slow-release Organic Acid Micro-emulsion with High Efficient Plugging Removal
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摘要: 针对油田常用酸化方法存在酸液剖面不均匀和二次伤害的问题,优选有机酸和无机酸形成复合酸,优选表面活性剂和助表面活性剂,制备出有机缓释酸微乳液,其最优配方为:AQAS∶AEO=1∶1, 正丁醇∶正辛醇 =1∶1,水相∶油相=3∶7,助表面活性剂︰表面活性剂=1∶2,乙酸∶氢氟酸=4∶1。该体系的泥饼清除率超过85%,在低渗岩心中解堵效果显著,其渗透率恢复值超过100%。Abstract: In view of the problem of uneven acidizing profile and second damage during the acidification in stimulation, organic acids and inorganic acids were selected to form complex acids, and surfactant and co-surfactant also were optimized to prepare organic slow-release acid micro-emulsion. The formula is: AQAS∶AEO=1∶1, n-butanol: n-octanol =1∶1, water phase: oil phase = 3∶7, co-surfactant∶surfactant =1∶2, acetic acid∶hydrofluoric acid = 4∶1. The mud cake removal rate of the system is more than 85%, the plugging removal effect in the low-permeability core is remarkable, and the permeability recovery value is more than 100%.
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Key words:
- Acidification /
- Organic slow-release /
- Micro-emulsified acid /
- Mud cake removal /
- De-plugging
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表 1 不同配方酸液对岩屑的溶蚀率
岩屑编号 有机酸液配方 溶蚀率/% 1 h 2 h 3 h 4 h 1# 12%CH3COOH+2%HF 3.5 6.1 9.6 11.8 12%CH3COOH+4%HF 5.2 8.6 12.5 14.6 16%CH3COOH+2%HF 7.6 10.3 14.5 17.7 16%CH3COOH + 4%HF 10.5 14.9 18.4 22.9 12%CH3COOH + 2%HCl 2.8 5.3 7.5 10.1 12%CH3COOH + 4%HCl 3.9 8.2 10.5 12.3 16%CH3COOH + 2%HCl 7.0 12.4 13.7 16.2 16%CH3COOH + 4%HCl 9.5 15.6 17.2 20.1 2# 12%CH3COOH+2%HF 33.3 37.7 42.5 44.6 12%CH3COOH+4%HF 36.8 39.5 44.1 49.4 16%CH3COOH+2%HF 47.9 52.2 54.7 58.1 16%CH3COOH + 4%HF 56.2 59.3 61.5 66.9 12%CH3COOH + 2%HCl 22.4 29.9 38.6 43.7 12%CH3COOH + 4%HCl 24.7 32.9 41.6 49.1 16%CH3COOH + 2%HCl 25.1 35.0 45.3 56.6 16%CH3COOH + 4%HCl 28.8 39.6 48.9 64.6 注:1#岩屑矿物:38%石英、13%钾长石、22%方解石、
12%白云石、2%黄铁矿、5%重晶石、8%黏土;2#岩屑矿物:8%石英、3%钾长石、81%方解石、5%白云石、1%黄铁矿、2%黏土表 2 工作液对渗透率的影响实验结果
工作液 实验
条件渗透率/
mD渗透率恢复值/
%现场钻井液 污染前 0.1732 污染后 0.0629 36.32 微乳酸M-1 解堵后 0.2588 149.42 -
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