EXPERIMENTAL STUDY ON THE CHEMICAL CLEANING TECHNOLOGY OF OIL SLUDGE IN OFFSHORE OILTANK

摘要

The accumulation of oil sludge always affects the normal operation of the crude oil system and water treatment process. The offshore oil field needs to carry out regular tank cleaning, which is complicated and requires the shutdown of some equipment. After the tank cleaning, the accumulation of oil sludge is easily to create great hann to human body, soil and air. The oily sludge must be treated to a standard before it can be stacked or buried. Therefore, it is very important to develop an economical and environmentally friendly method for the disposal of oil sludge from clean tanks in offshore oilfields. In this article, the physical properties of oil sludge samples were analyzed, three cleaning agents were selected, and compound experiments were carried out. It was concluded that when the mass fraction ratio of B: D: E= 0.25: 1.00: 1.00, the cleaning effect was relatively ideal, and the oil removal rate reached 84.25. Through the single factor experiment, the optimum technological parameters of chemical cleaning technology for oil sludge removal from offshore oil field were optimized: in liquid-solid ratio (V/m) 3:1 mixed cleaning, cleaning temperature 70°C, stirring speed 600 rpm, 40 minutes cleaning, cleaning level1.In view of the optimized process, the oil sludge treatment capacity of tank cleaning was increased. Each batch of 100 g and 200g oil sludge cleaning were processed on site, and 5 sets of repeated verification experiments were carried out respectively. After cleaning and centrifugation, the oil removal rate was higher than 94 for single batch of lOOg treatment, and 93 for single batch of 200g treatment. Using the optimal chemical cleaning process conditions optimized above, (he oily sludge from different sources was treated separately. After the treatment was completed, the oil, water and solid were separated by centrifugation. The results show that the oil removal rate is higher than 85.