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- Title
无机盐对沥青质稳定性及对分散剂性能的影响.
- Authors
龚俊; 韦敏; 郝明辉; 李丙贤; 陈亮
- Abstract
There are many factors inducing asphaltene deposition, but the influence and mechanism of inorganic salts and minerals on asphaltene stability are not clear. Aiming at the samples of crude oil and asphaltene sediment in four oil areas with asphaltene deposition problems, the composition and elements of crude oil, the physical parameters of asphaltene sediment elements and aqueous solution were measured and analyzed by four component analysis, high temperature simulated distillation, Fourier transform infrared spectroscopy and X-ray fluorescence spectroscopy, and the effects of inorganic salts on the properties of asphaltene dispersant were evaluated. The experimental results showed that the asphaltene deposition of crude oil sample A was due to the unstable asphaltene clusters in the crude oil, and the colloidal instability index CII value reached 1.1. While the deposition of crude oil samples B and C was caused by the contamination from drilling and completion fluid. Most inorganic elements in crude oil and asphaltene sediment samples came from reservoir, while Br element came from brominated salt in drilling and completion fluid. Inorganic bromine salts could produce strong gravitational action of ion-ion or ion -dipole with asphaltene molecules and destroyed the colloidal stability in crude oil. The decrease of inorganic salt concentration would weaken the interference of inorganic salt ions on the interaction between asphaltene and dispersant molecules, and greatly improved the performance of dispersant. The research results provided a reference for preventing asphaltene deposition and alleviating deposition damage.
- Subjects
FOURIER transform infrared spectroscopy; FLUORESCENCE spectroscopy; PETROLEUM; DRILLING fluids; X-ray fluorescence; COLLOIDAL stability; NEAR infrared spectroscopy
- Publication
Oilfield Chemistry, 2023, Vol 40, Issue 3, p516
- ISSN
1000-4092
- Publication type
Article
- DOI
10.19346/j.cnki.1000-4092.2023.03.021