Downhole measurements and determination of natural gas composition using Raman spectroscopy

Dąbrowski, Karol; Kuczyński, Szymon; Barbacki, Jan; Włodek, T.; Smulski, Rafał; Nagy, Stanisław

doi:10.1016/j.jngse.2019.02.003

Cited by 23 publications

(18 citation statements)

References 11 publications

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“…It is present in atmospheric air, often found in inclusions in minerals, and is also the dominant component of natural gas. Development of Raman gas analysis [1][2][3][4][5][6][7][8][9] brings up the need of information that allows taking into account changes in the methane Raman spectrum under various conditions (temperature, pressure, environment). At present, shifts and broadenings of its fundamental bands [10][11][12][13][14][15], as well as changes in the ratio of peak intensities [13,[15][16][17] are known.…”

Section: Introductionmentioning

confidence: 99%

Depolarization Ratios of Methane Raman Bands as a Function of Pressure

Petrov

2020

Molecules

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In this work, we measured the intensities of Q-branches of the ν 1 , ν 2 and ν 3 bands in the polarized and depolarized methane Raman spectra in the pressure range of 1-60 atm. It was established that the pressure dependence of depolarization ratios of the ν 2 and ν 3 bands are negligible. In turn, the depolarization ratio of the ν 1 band increases with increasing pressure and reaches approximately 0.0045 at 60 atm. These data are more precise than previously published ones because ν 1 band intensities were determined taking into account the contribution of overlapping lines of ν 3 band. The presented data will be useful in calculating the methane polarizabilities at high pressure, as well as in calculating methane Raman spectra for measuring the natural gas composition using Raman spectroscopy.

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Section: Introductionmentioning

confidence: 99%

Depolarization Ratios of Methane Raman Bands as a Function of Pressure

Petrov

2020

Molecules

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“…In the process of mining natural gas, the crude gas contains about 15 components. Methane, ethane, propane, and other alkane gases are the main components of natural gas [ 3 ]. In the laboratory, the gas composition only involves methane, ethane, propane, and nitrogen.…”

Section: Field Work Of the Mixed Natural Gas Monitoring System Andmentioning

confidence: 99%

“…Natural gas is extracted via a series of physical and chemical operations. The extracted natural gas is a mixture of methane, ethane, propane, and other gases [ 3 ]. To ensure the heating quality of natural gas and meet the environmental protection requirements, the composition analysis of natural gas is an essential procedure in the exploitation of natural gas [ 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Design and Application of Mixed Natural Gas Monitoring System Using Artificial Neural Networks

Wang

Lei

et al. 2021

Sensors

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Natural gas component analysis is one of the significant technologies in the exploitation and utilization of natural gas. A stable and accurate online natural gas monitoring system is necessary for the gas extracting industry. We have developed an online monitoring system of natural gas with a novel hardware architecture. It improves the dependability and maintainability of the system. A specific instruction set is designed to facilitate the coordination of software and hardware. To reduce the sample noise, the exponentially weighted moving average (EWMA) method is used to preprocess the real-time raw data of the sensor array. A tailored neural network is designed for calibration. And the relationship between the performance and the structure of the gas neural network is demonstrated to find the optimal solution for accuracy and hardware scale. The design not only focuses on the optimization of individual components but also focuses on system-level improvement. The system has been running stably for several months in the gas fields. It meets the requirements of stability, ease of use, maintainability, and online monitoring in industrial applications.

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“…Use of MOFs in automotive vehicle cylinders offers an important gateway for new developments and can provide greater security in the storage of hydrogen and methane gases, the latter being the most used. [ 7 ] Methane is the main constituent of natural gas (~86%), [ 8 ] and the storage of large quantities of this gas requires the application of high pressures (close to 350 bar) at considerable expense besides the safety aspects, demanding higher energy density storage. [ 9 ] Hydrogen is another important gas for storage, where MOFs are promising adsorbent materials.…”

Section: Introductionmentioning

confidence: 99%

IRMOF‐8: Theoretical evaluation of aluminum doping on hydrogen, methane, and hydrogen sulfide adsorption

Rodrigues

Dutra²,

Martins

et al. 2020

Int J of Quantum Chemistry

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The use of porous materials, aimed at increasing gas storage capacity at lower pressures, exploits physical adsorption and is an emerging strategy that is being widely investigated. In this scope, porous materials such as metal organic frameworks (MOFs) are a viable alternative, where structural modifications can enhance the properties of these materials and improve the degree of adsorption for a given gas. In this work, we evaluated the adsorption of methane, hydrogen, and hydrogen sulfide gases on pure isoreticular MOF (IRMOF)‐8 and aluminum‐doped IRMOF‐8 using density functional theory Perdew‐Burke‐Ernzerhof/DZVP and semiempirical AM1, PM3, PM6, PM6‐DH+, PM6‐DH2, PM6‐D3, and PM7 methods. Adsorption isotherms were calculated by means of Grand Canonical Monte Carlo simulations. It was found that doping did not provide a significant increase in the amount of adsorbed methane and hydrogen gases. Conversely, doping led to a considerable increase for hydrogen sulfide capture.

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Downhole measurements and determination of natural gas composition using Raman spectroscopy

Cited by 23 publications

References 11 publications

Depolarization Ratios of Methane Raman Bands as a Function of Pressure

Depolarization Ratios of Methane Raman Bands as a Function of Pressure

Design and Application of Mixed Natural Gas Monitoring System Using Artificial Neural Networks

IRMOF‐8: Theoretical evaluation of aluminum doping on hydrogen, methane, and hydrogen sulfide adsorption

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