Study on dehydration technology of heavy oil containing polymer in SZ36-1 oilfield

Main factors on dehydration were investigated to resovle the high demulsifying temperature and poor dehydrating effect of heavy oil containing polymer produced from the SZ36-1 oil field.It is found that dehydration rate increases at first, then decreases,as polymer content increase,whereas oil content increase.Besides,dehydration rate increases as the temperature and water content increase.The selection of high efficiency demulsifiers was conducted by compounding the demulsifiers and adding additive.The optimum demulsifier is FJM-its composition is L101:EC2211A: methanol:diethylene glycol monobutyl ether when the temperature is 75 ℃ and the demulsifier concentration is 300 mg/L,and its dehydration rate reaches 95.4 % after 90 min with clean water and uncluttered interface, achieving the ideal effect below the original demulsifying temperature.