Research On Low-temperature Demulsifier Optimization And Technological Transformation Of A Remote Block In Xinjiang Oilfield

Aiming at the problem that the water content of the produced fluid in a remote block in Xinjiang Oilfield is increasing year by year,the difficulty of demulsification is increasing,and the transportation cost is too high.A set of transformation process with better economy and environmental protection is designed.The process provide technical support for reducing waste water discharge and increasing oil production economic benefits,and is of great significance to stable oil production.Firstly,the optimization experiment of demulsifier is carried out by bottle test method.The recommended demulsifier is FTD-67,the dosage is 100mg/L,and the suitable temperature is 35°C.The FTD-67 demulsifier was used in combination with the high-frequency pulse electric dehydration device to carry out the dehydration treatment of crude oil laboratory in remote blocks.The water content of the purified oil after treatment can be lower than 0.5%,which can greatly meet the requirements of crude oil export.Secondly,improving the process will increase the operation capacity of on-site wastewater treatment.so,more efficient water purification agents need to be screened.The coagulation water purification experiment showed that polyaluminum chloride was used as flocculant,and No.2 polyacrylamide(molecular weight 10 million)was used as coagulant aid.Suspended solids and oil content were reduced to the level required for re-injection of oilfields.In the follow-up,the influence of p H,stirring time,temperature,standing time and other operating conditions in the water purification process was explored,and guidance for the on-site process improvement was given.The high-frequency pulse integrated device and demulsifier are used in combination in remote blocks,and field experiments are conducted to determine the process conditions in the laboratory.The project went through the pre-commissioning and mid-term experiments and finally ran smoothly.During stable operation,the water content of the purified oil exported from the high-frequency pulse integrated device were less than 0.5%.The re-injection water was sampled and tested,and the results met the oilfield re-injection standard.After cost estimation,the annual cost savings of more than 1.5 million yuan and 45,200 tons of clean water can be saved without considering the interference of maintenance.