Study Of The Unheating Chemical Dehydration Technology Of Huabei Oil Field

At present,early oil wells of huabei oilfield have been in high water cut stage, and production streams have changed from water-in-oil emulsion to oil in water emulsion or mixture emulsion of both two forms. The demulsifier used in place needs a high temperature to reach the dehydration standard. The amount to be used is very much, and the oil content of production water is high. All of these bring great difficulty for the next wastewater treatment. Adding the application of tertiary oil recovery technology recently, polymerizations injectied oil layer make the emulsion form of production streams more complex and affect dehydrating of crude oil more or less. Demulsification and dehydration become more important. In this article, we do a series of experiments to screen and combine varies of demulsifiers after complete some researchs on the dehydration process in Huabei Oil Field. We find more effective demulsifiers for four blocks in Huabei Oil Field and bring forward unheating chemical dehydration technology. In addition, we also do some oil/water interfacial tension experiments to compare these demulsifiers. And we find demulsifiers can largely reduce the oil/water interfacial tension, but the value of oil/water interfacial tension has nothing to do with crude oil dehydration rate.In this article, numerical simulation is also used to calculate water droplet settling in settling tank by the software of fluent. By the results of the calculation, we find that the content of 150μm diameter water droplets in the outler of settling tank is 0.4% after one hour settling. That means we can get the eligible crude oil if 150μm diameter water droplets are settled in settling tank in field practice. Thereby, we can get the settling time by this.