Preparation and Oil Displacement Performance Evaluation of an Environmentally Friendly Amphoteric Surfactant
李云 1袁凯涛 2寇枫 3李锦源 4李先军 5张秀英6
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作者信息
1. 陕西延长石油(集团)有限责任公司,陕西 西安 710065
2. 延长油田股份有限公司定边采油厂,陕西 榆林 718600
3. 陕西延长石油国际能源化工有限公司,陕西 西安 710000
4. 长庆油田分公司第二采气厂,陕西 榆林 719000
5. 捷贝通石油技术集团股份有限公司,四川 成都 610015
6. 青海油田分公司采油三厂,青海 茫崖 817000
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摘要
合成了一种新型环保型两性表面活性剂PASA,并系统评价其驱油性能.结果表明:PASA在油水界面上形成的吸附层能显著降低界面张力,当其质量浓度为0.01～1.00 mg∙L-1 时,油水界面张力从42.5 mN∙m-1 降低到29.2 mN∙m-1.在抗盐性方面,PASA表现出良好的稳定性,即使在NaCl质量分数为 5%的条件下,仍能保持较低的表面张力.润湿性实验显示,PASA 能有效地改变岩石表面的润湿性,使其由亲油转向亲水.在岩心驱替实验中,当PASA质量浓度为 10 mg∙L-1 时,提高采收率达到了 31.3%.现场应用结果表明:注入PASA表面活性剂溶液后,受影响的油井日产油量显著增加,平均每注入1 t PASA表面活性剂,可增加油田产量31.3 t.
Abstract
A new environmentally friendly amphoteric surfactant PASA was synthesized,and its oil displacement performance was systematically evaluated.Research results showed that the adsorption layer formed by PASA on the oil-water interface could significantly reduce the interfacial tension.Within the mass concentration range from 0.01 mg·L-1 to 1.00 mg·L-1,the oil-water interfacial tension ranged from 42.5 mN·m-1 to 29.2 mN·m-1.In terms of salt resistance,PASA showed good stability and could maintain a low surface tension even at a NaCl mass fraction of 5%.Wettability experiments showed that PASA could effectively change the wettability of the rock surface,turning it from oil-wet to water-wet.In the core flooding experiment,when the PASA mass concentration was 10 mg·L-1,the enhanced oil recovery reached 31.3%.Field application results showed that after injecting PASA surfactant solution,the daily oil production of the affected oil wells increased significantly.On average,the injection of 1 t PASA surfactant could increase the oilfield production by 31.3 t.
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