双子表面活性剂复配体系性能评价及在陇东油田的应用

Performance Evaluation of Dimeric Surfactant Compound System and Its Application in Longdong Oilfield

针对陇东油田注水井出现欠注问题,以阳离子表面活性剂十六烷基三甲基溴化铵与双磷酸酯型双子表面活性剂XG等为原料,制得阳离子-双子表面活性剂复配体系XG-D。通过油水界面张力和润湿性能测试及室内岩心驱替等方法研究了XG-D的各项性能,并在陇东油田进行了现场应用。结果表明,XG-D与模拟地层水的配伍性较好,0.25%的XG-D可使油水界面张力降至0.01 mN/m,具备良好的降低油水界面张力的性能。XG-D的抗盐性较好。XG-D可吸附于亲油云母表面,使固体亲水表面转变为弱亲水表面,润湿性良好。岩心驱替实验结果表明XG-D具有较好的降压增注特性,可使注水压力降幅达49.88%,驱油效率提高6.4%。现场应用结果表明,可在陇东油田高压注水井用XG-D实现降压增注。

Aiming at the problem of water injection in the injection well of Longdong oilfield,the cationic-gemini surfactant compounding system XG-D was prepared using cationic surfactant cetyltrimethylammonium bromide and bisphosphonate dimeric surfactant XG as raw materials.The performance of XG-D was studied by oil-water interfacial tension and wetting performance test and indoor core flooding.Finally XG-D was applied in Longdong oilfield.The results showed that XG-D had good compatibility with simulated formation water.0.25%XG-D could reduce the oil-water interfacial tension to 0.01 mN/m,indicating good performance on reducing oil-water interfacial tension.XG-D had better salt tolerance.XG-D could adsorbed on the surface of oleophilic mica,transforming the hydrophilic surface of solid into a weak hydrophilic surface with good conversion.The results of core flooding experiments showed that XG-D had better depressurization and injection characteristics,which could reduce the water injection pressure by 49.88%and increase the oil displacement efficiency by 6.4%.The field application results showed that XG-D could be used to achieve the pressure reduction and injection increase in the high pressure injection well of Longdong oilfield.