Molecular level characterization to identify and measure the deposits from the petroleum fluids were performed. It is believed that the chemicals in the deposit are responsible to cause problems such as corrosion in oil pipelines, fuel tanks, refinery equipment, and boilers. The crude oil deposit was obtained from tanks located at Artawi field in south of Iraq /Basrah. Separation by centrifuge and filtration were used to prepare the sample. The samples were fractionated into three layers (upper part deposit sticky, middle part water and lower part deposit solid). The chemical compounds in the crude oil deposit were characterized by using ultra-high resolution Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (FT-ICR MS) along with (+) mode atmospheric photoionization (APPI)) ion source. FT-ICR MS analysis provides comprehensive heteroatoms class distribution. The deposit of crude oils yielded distributions of hydrocarbons and heteroatoms. The results of such analysis showed the hydrocarbons are more abundant in the oil deposit solid, while the crude oil, deposit of crude oil sticky and water showed the heteroatoms are more abundant than hydrocarbons. Therefore, these procedures provide an understanding of the overall behavior of the species that precipitate as well as of the interactions among those compounds.
Environmental & Energy Mass Spectrometry Research Lab.