耐温抗盐型复合表面活性剂驱油体系的合成及应用

Synthesis and application of oil displacement system of temperature-resistant and salt-resistant high-efficiency composite surfactant

郭宇

GUO Yu

中国华油集团公司，北京 100101

China Huayou Group Corporation, CNPC, Beijing 100101, China

为解决高温、高矿化度油藏注水开发效果差的问题，通过室内实验，合成了一种新型阴￣非离子表面活性剂AN￣2，复配以磺酸盐型Gemini表面活性剂GS￣1，研制出一种耐温抗盐型高效复合表面活性剂驱油体系。对体系性能进行了室内评价，结果表明：体系具有良好的耐温抗盐性能，在温度140 ℃、矿化度30×104 mg/L时，界面张力仍可以达到10-3 mN/m数量级，在125 ℃下老化30 d后仍能保持超低界面张力水平；体系的动态吸附量较小，在地层中的吸附损失较少；当注入0.3 PV的驱油体系时，能够使岩心水驱后的采收率增加15%以上。现场应用结果表明，施工后区块内生产井产液量、产油量明显上升，含水率下降，取得明显增油效果。

In order to solve the poor water flooding effect in high-temperature and high-salinity oil reservoir, a novel anion-nonionic surfactant AN-2 is synthesized through laboratory experiment. And then sulfonate Gemini surfactant GS-1 is compounded to develop an oil displacement system of temperature-resistant and salt-resistant high-efficiency composite surfactant. Indoor evaluation shows that the oil displacement system has good temperature-resistance and salt-resistance. When the temperature reaches 140 ℃ and the salinity reaches 30×104 mg/L, the interfacial tension can still reach the order of magnitude of 10￣3 mN/m. And the ultra-low interfacial tension can be maintained at 125 ℃ after 30 days of aging. The dynamic adsorption capacity of the system is small and the adsorption loss in the stratum is less. The injected 0.3 PV oil displacement system increases the recovery rate of core after water flooding more than 15%. According to the field application results, the volume of production fluid and oil in production wells within the block is obviously increased, and the water content is decreased, showing an obvious effect of oil increase.

10.6056/dkyqt201802027