关键词: 三元复合驱, 采出液, 沉降时间, 乳化

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