Sulfur deposition prediction method for acidic natural gas pipeline

A technology of sour natural gas and prediction method, which is applied in the field of sulfur deposition prediction of sour natural gas pipelines, and can solve the problems of unsatisfactory calculation accuracy and so on.

Inactive Publication Date: 2015-10-28
XI'AN PETROLEUM UNIVERSITY
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Problems solved by technology

The traditional method does not consider the influence of the above factors, and its calculation accuracy is not satisfactory

Method used

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  • Sulfur deposition prediction method for acidic natural gas pipeline
  • Sulfur deposition prediction method for acidic natural gas pipeline
  • Sulfur deposition prediction method for acidic natural gas pipeline

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Embodiment Construction

[0070] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0071] A method for predicting sulfur deposition in sour natural gas pipelines, comprising the following steps:

[0072] refer to figure 1 , Step S1: Establish a calculation model for thermodynamic properties such as sour natural gas density, dynamic viscosity, deviation coefficient, and Joule-Thomson coefficient.

[0073] (1) The density of sour natural gas is calculated by the following formula:

[0074] ρ = Σy i M i Σy i V i

[0075] where ρ, y i ,M i and V i Respectively represent the density of the mixed gas and the mole fraction, relative molecular mass and molar volume of the i component.

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Abstract

The invention provides a sulfur deposition prediction method for an acidic natural gas pipeline. According to the technical scheme of the invention, based on a sulfur solubility model, the classic nucleation theory and a particle motion equation, a thermodynamic model and a dynamical model for sulfur precipitation and deposition are established. Meanwhile, the saturated distance, the supersaturated distance and the particle maximal migration distance are calculated, while the sulfur deposition position, the sulfur deposition yield and the sulfur deposition average thickness of the acidic natural gas pipeline are figured out. In this way, the sulfur deposition prediction for the acidic natural gas pipeline can be realized. Based on the above method, a supersaturated distance L2 exists between a saturation point and the appearance location of sulfur particles, so that the precipitation location of sulfur particles can be calculated more accurately. The motion trajectory of sulfur particles can be figured out based on the particle motion equation, and then the maximal migration distance L3 of particles is determined. In view of the mechanism, the above method is more reasonable in predicting the deposition location of sulfur particles, compared with the conventional sulfur deposition prediction method based on a critical velocity calculation model for sulfur particles in a vertical well bore. In this way, the prediction result is more scientific, more accurate and more reliable.

Description

technical field [0001] The invention relates to the technical field of sour natural gas gathering and transportation, in particular to a method for predicting sulfur deposition in sour natural gas pipelines. Background technique [0002] Sour natural gas often contains sulfides such as hydrogen sulfide. During development and gathering and transportation, it is not only highly toxic and highly corrosive, but also precipitates elemental sulfur under certain conditions, causing the deposition of sulfur elements. Sulfur deposition in the gathering and transportation system will reduce the overflow area of ​​the pipeline and reduce the efficiency of gathering and transportation. In severe cases, it will block the pipeline and equipment, resulting in shutdown. At the same time, the presence of deposited sulfur will also accelerate the corrosion of gathering and transportation pipelines and equipment, resulting in fatigue damage of pipes, which seriously affects the normal operati...

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Application Information

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IPC IPC(8): G01N15/04G01B21/08G01B21/00
CPCG01N33/225
Inventor 潘杰李冉白俊华吴刚
Owner XI'AN PETROLEUM UNIVERSITY
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