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Prediction method for solubility of elemental sulfur in sulfur-containing gas

A prediction method and technology of natural gas, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve problems such as large deviations

Inactive Publication Date: 2015-04-22
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] Aiming at the problem that the existing prediction methods and models of elemental sulfur solubility in sour natural gas have large deviations, the purpose of the present invention is to provide a new prediction method for elemental sulfur solubility in sour natural gas

Method used

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  • Prediction method for solubility of elemental sulfur in sulfur-containing gas
  • Prediction method for solubility of elemental sulfur in sulfur-containing gas
  • Prediction method for solubility of elemental sulfur in sulfur-containing gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The natural gas components used in the test are listed in Table 1.

[0037] Table 1 Natural gas composition

[0038] components

h 2 S

N 2

he

CO 2

CH 4

Well fluid (wt%)

6.86

0.5

0.02

2.76

89.86

[0039] Due to the H in natural gas components 2 S is 6.86%, which is close to 7%. Therefore, it is determined to use formula B, and the natural gas density is calculated from formula (2) according to the temperature and pressure. According to the density is greater than 200 (kg / m 3 Still less than 200(kg / m 3 Select k, a, b parameters, natural gas density ρ3 , k=1.38, a=-2582.202543, b=-8.39375; natural gas density ρ>200kg / m 3 , k=3.20, a=-4880.738659, b=-12.4969; then calculate the solubility of sulfur element according to formula (1), and use the Roberts formula of formula (3) to calculate the solubility of sulfur element at the same time, and compare with the measured solubility, the result As...

Embodiment 2

[0044] The natural components used in the experiment are shown in Table 3.

[0045] Table 3 Natural gas components and their mass content

[0046] components

h 2 S

CO 2

CH 4

1

4.95%

7.40%

87.65%

[0047] It can be seen from Table 3 that H 2 The S content is 4.95%, which is close to 6%. Therefore, the formula C is used to calculate the density according to the temperature, pressure and relative density, and the density is greater than 200kg / m 3 , so k=3.28, a=-4880.738659, b=-12.49685448, calculate the solubility of sulfur element, and use the Roberts formula of formula (3) to calculate the solubility of sulfur element at the same time, and compare with the measured solubility, the results are shown in Table 4 .

[0048] Table 4 Solubility Calculation Comparison

[0049]

[0050] As can be seen from Table 4, the solubility calculated according to the Roberts formula differs greatly from the measured value. Comp...

Embodiment 3

[0052] The natural gas components used in the experiment are shown in Table 5.

[0053] Table 5 Natural gas components and mass content

[0054] components

h 2 S

CO 2

CH 4

2

9.93%

7.16%

82.91%

[0055] It can be seen from Table 6 that H 2 The S content is close to 7%, and the B formula is selected, and the density calculated according to the temperature, pressure and relative density is greater than 200kg / m 3, determine k=3.20, a=-4880.738659, b=-12.4969 to calculate, and use Roberts formula to calculate at the same time, and compare the results with the measured values ​​in Table 6.

[0056] Table 6 Solubility Calculation Comparison

[0057]

[0058] As can be seen from Table 6, the solubility calculated according to the Roberts formula is quite different from the measured value, and the result calculated by the method of the present invention is much closer to the Roberts model than the measured value.

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Abstract

The invention discloses a prediction method for solubility of elemental sulfur in sulfur-containing gas. The method comprises the steps of first determining H2S content and gas density in the sulfur-containing gas and calculating accordingly; and determining constants k, a and b, wherein the constants k, a and b are determined according to the conformity of the H2S content and the gas density in the sulfur-containing gas with a certain set of data. The prediction result of the method has good fitness with an actual value.

Description

technical field [0001] The invention relates to a method for predicting the solubility of elemental sulfur in natural gas during natural gas exploration and production. Background technique [0002] With the continuous in-depth exploration and development of sour gas reservoirs, the accompanying problems have also received extensive attention. During the development of sour gas reservoirs, H 2 S corrosion, high toxicity and sulfur deposition are the three major problems that need to be paid attention to. For gas reservoir engineers, the deposition of elemental sulfur is the core problem. The deposition of elemental sulfur (elemental sulfur) in the reservoir, bottom hole or tubing will lead to a decrease in gas well production or even stop production directly. Therefore, accurate prediction of elemental sulfur solubility is one of the problems that must be solved first in the development of sour gas reservoirs. Although the experiment can obtain the solubility of elemental...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/00
Inventor 胡景宏梁涛
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)