Method for detecting contents of paraffin and asphaltene in oil

A technology of asphaltene and paraffin, which is applied in the fields of earthwork drilling, nuclear magnetic resonance analysis, wellbore/well components, etc. It can solve the problems of time-consuming and complicated known methods

Inactive Publication Date: 2009-09-09
PRAD RES & DEV LTD
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Problems solved by technology

[0010] Known methods for determining the concentration of paraffins and asphaltenes in oils are rather

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  • Method for detecting contents of paraffin and asphaltene in oil
  • Method for detecting contents of paraffin and asphaltene in oil

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Embodiment Construction

[0014] The relaxation time of the NMR signal from the solid hydrogen-containing fraction is known to be much less than the relaxation time of the NMR signal from the liquid hydrogen-containing fraction; this allows the determination of the cumulative free induction drop of the solid and liquid components to the oil sample contribution to the curve. Thus, analysis of the free induction decline curve of an oil sample allows determination of the ratio of solid hydrogen-containing components to liquid hydrogen-containing components therein.

[0015] Virtually all suspended solid particles contained in the oil composition are presented by paraffins and asphaltenes. If the resin is separated from the oil, the resin can exist in solid form under normal conditions, however, when dissolved in the other liquid components of the oil, they become part of the liquid phase, contrary to paraffins and asphaltenes, and are The NMR signal produces a characteristic contribution.

[0016] Does ...

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Abstract

The invention relates to a method for measuring concentrations of paraffin and asphaltene in oil. The method comprises: extracting three crude oil samples; dissolving two extracted samples in a solvent, and then removing the solvent and light oil; simultaneously, removing the asphaltene from one sample subjected to solvent treatment; measuring free induction falling curves of the three samples by using a nuclear magnetic resonance method; determining the ratio of a solid hydrogen-containing part to a liquid hydrogen-containing part suspended in the oil; through the content of the solid hydrogen-containing part in the sample subjected to asphaltene removal and solvent treatment, judging the concentration of the paraffin; through the content of the solid hydrogen-containing part in another sample subjected to solvent treatment and the consideration of the determined concentration of the paraffin, judging the concentration of the asphaltene; and based on the determined ratio of the paraffin to the asphaltene in the solid hydrogen-containing part, determining the concentrations of the paraffin and the asphaltene in the crude oil.

Description

technical field [0001] The present invention relates to geology, geochemistry, refining and petrochemistry, ie to the determination of paraffin and asphaltenes content in oils, which may have particular utility in the analysis of heavy oils and bitumen. Background technique [0002] Data on the composition of the oil, especially on the concentration of the heavy (solids) fraction, significantly facilitates the optimization of oil recovery and refining processes. However, this information is not always available because of the complexity, uncertainty and high cost of state-of-the-art methods for determining the concentrations of some oil components. Although light oil fractions can be separated by simple distillation and rectification methods, simple methods do not allow us to determine the concentration of the heaviest oil fractions (paraffins and asphaltenes). [0003] Previous methods for the determination of paraffin and asphaltene concentrations in oils were standardize...

Claims

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Application Information

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IPC IPC(8): G01N24/08E21B49/08
Inventor 伊万·尼科林谢尔盖·萨福诺夫弗拉基米尔·斯基尔达
Owner PRAD RES & DEV LTD
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