Selection alternative treatment strategies by using demulsifier bottle test method at, El Bouri Oil field, Libya

Abstract

The main objective of this paper is to select an alternative new emulsion breaker (demulsifier) to be injected in the system. Provide a chemical treatment needed to get the best demulsifier and reach salt in crude less than 20 ptb (pound per thousand barrel) oil in water content to the acceptable specifications less than 10 ppm of oil to be disposed in the sea according to the limitation reported in the waste water effluent specifications. The demulsifier selection was done using standard upstream chemical procedures commonly called bottle tests and comparing the incumbent, Nal-l2012, product versus a selection of upstream chemical demulsifiers. Composite oil samples were collected from inlet streams tarin1, 2, LP, and DP3 and tested at Bouri Field Laboratory. Those oil samples were dosed by six different products of demulsifiers and gave good performance results. The demulsifiers DMO3560 and DMO86416 have shown good results in the bottle test for 30 minutes. DMO3560 gave good results for fast separation within 5 minutes and clear water compared to the incumbent sample at chemical concentrations between 30-55 PPM. DMO86416 also gave good results between 30 and 60 PPM; this type gave very clear water compared to the incumbent chemical. The demulsifiers selected in the bottle testing, DMO3560 and DMO86416, will offer a better water drop and oil dehydration compared to the incumbent. One of them will be considered for a field trial. During the trial, it was found that the demulsifiers DMO3560 achieved the required technical goals in terms of both water quality (less than 10 PPM oil), oil quality (BS&W less than 0.05 and salt less than 20 PTB), and a dosage rate less than 40 PPM