Abstract: The concentration of ions in the three element composite flooding is higher, the radius of the suspended particles is larger, the emulsification of the crude oil is serious, and the O/W emulsion is formed, which contains the polymer and the surface active agent. So, the viscosity of the three element composite flooding is larger and the composition is more complex. The above reasons make it difficult for the three yuan produced liquid to achieve better separation effect by conventional sedimentation treatment when oil and water separation is carried out. Through indoor sedimentation experiment, the settlement effect of the three surfactant polymer flooding under the conditions of different settling time and settlement temperature is studied, and effect and technical limits after mixing of three yuan and polymer flooding system are clearly defined. The experimental results show that three yuan of produced liquid in the blending of polymer flooding produced liquid, helps to reduce the three yuan produced liquid mixed with polymer flooding produced liquid is helpful to reduce the oil-water separation difficulty. From the analysis of water quality of mixed wastewater, the mixed three yuan extraction liquid and the polymer flooding recovery solution can not only reduce the sewage the treatment difficulty, but also be more conducive to the stable operation of the existing three yuan oilfield produced water treatment process. The optimum mixing ratio of three yuan production fluid and polymer flooding production fluid is1∶3,and the optimum mixing settlement time limit is 8 h.

Key words: Three element composite flooding, Production fluid, Settling time, Emulsification

摘要： 三元复合驱采出液中离子矿化度较高，悬浮颗粒半径较大，原油乳化严重，形成了O/W型乳状液，体系黏度较大，成分较复杂，使三元采出液这种复杂的污水体系，在进行油水分离时，很难靠常规沉降处理方法达到较好的分离效果。通过室内沉降实验，研究三元复合驱采出液体系在不同沉降时间、沉降温度条件下的沉降效果，明确三元和聚合物驱体系混掺后沉降效果及技术界限。实验结果表明，三元采出液中混掺聚驱采出液有助于降低三元采出液中油水的分离难度，从混掺污水的水质特性分析，将三元采出液与聚驱采出液混掺，不但可以降低污水处理难度，而且更加有利于现有油田三元采出水处理工艺的稳定运行，且三元采出液与聚驱采出液的最佳混掺比1∶3，最佳混掺沉降时间界限为8 h。

关键词: 三元复合驱, 采出液, 沉降时间, 乳化