abstract
With the development of society, the growing demand for petroleum, Crude oil production in oilfield and basic in the mid-late period. With the development of water injection wells, the oil content of large increase output. Existing demulsifier has certain limitation, for determining the type oil-in-water emulsions, dehydration rate is low, high dehydration temperature, slow dehydration speed，kind of shortcomings .Therefore, in different regions of the different oil to select a suitable demulsifier plays an important role.
Experiments of demulsifier screening showed that, In experimental temperature 80 degrees and dosage of demulsifier 20ppm quality concentrations, Select the suitable for highly sour crude for good performance of demulsifier is NO.5 ,NO.6, NO.7and NO.8.
When different conditions for their effects, selection of 4 kinds of demulsifier, in 90 degrees Celsius temperature, with the increase of demulsifiers dosage, crude oil, water off with the dosage of demulsifier 15ppm - 20ppm, oil dehydration and stabilize maximum. The selected for 20ppm demulsifier dosage, with the rise of temperature, the oil off water also increases. In 80-90 ° c, the oil off water and stabilize maximum, so the best role demulsifier for 80-90 degrees Celsius temperature. Under the same conditions, relative to the other three kinds of demulsifier, NO.6 is the best.
Due to enhance oil recovery in eor, adding petroleum sulfonates surfactants, to increase the water and oil emulsification, so crude oil recovery liquid containing oil sulfonates generally. The influence of reaction of demulsifiers performance in experimental conditions, 90 degrees Celsius temperature for 10ppm demulsifier and dosage, under the condition of investigation of petroleum sulfonates evaluation of demulsifier. Research shows that petroleum sulfonates significantly reduced in highly sour crude demulsifier during their dehydration effect.
Key worlds； demulsifier , petroleum sulfonates, crude oil dehydration, eor
