scholarly journals An accurate correlation for calculating natural gas compressibility factors under a wide range of pressure conditions

2021 ◽  
Author(s):  
Yichen Wang ◽  
Jigen Ye ◽  
Shuhong Wu
Keyword(s):  
Natural Gas ◽  
Wide Range ◽  
Compressibility Factors ◽  
Gas Compressibility

scholarly journals A Novel Simplification for the Prediction of Natural Gas Compressibility Factor

2021 ◽  
pp. 63-76
Author(s):  
OMOBOLANLE Oluwasegun Cornelious ◽  
AKINSETE Oluwatoyin Olakunle ◽  
AROMOKEYE Niyi
Keyword(s):  
Natural Gas ◽  
Compressibility Factor ◽  
Reservoir Properties ◽  
Predictive Tool ◽  
Deviation Factor ◽  
Temperature And Pressure ◽  
Explicit Correlation ◽  
Compressibility Factors ◽  
Gas Compressibility ◽  
Reduced Temperature

The need for a simpler, effective and less expensive predictive tool for the estimation of natural gas compressibility factor cannot be exaggerated. An accurate prediction of gas compressibility factor is essential because it plays a definitive role in evaluating gas reservoir properties used in the estimation of gas reserves, custody transfer and design of surface equipment. In this present work, a novel explicit correlation and a highly sophisticated computer program were developed to accurately predict natural gas deviation factor. The research also aims to effectively capture the relationship between Pseudo-reduced temperature and pressure in relations to the Z-factor. In this study, 3972 digitized data points extracted from Standing and Katz’s Chart were regressed and analyzed using Microsoft Excel Spreadsheet, the extraction of this data was done using WebPlotDigitizer developed by Ankit Rohatgi of GitHub, Pacifica, CA, USA. The correlation was developed as a function of Pseudo-reduced temperature and pressure with tuned parameters distributed across 1.05 ≤ Tpr ≤ 3.0 and 0 < Ppr ≤ 8.0. Subsequently, the input (Tpr and Ppr values) of the feed data was used to validate the correlation and compare it with other known and published correlations. Statistical analysis of the results showed that a 99.8% agreement exists between the predicted and actual compressibility factors for the various test scenarios and case studies involving both sweet and sour gases. Also, the correlation was observed to outperform other models. Finally, the results were observed to perfectly mimic the Standing and Katz charts with an overall correlation coefficient of 99.76% and an adjusted R2 of 99.75%. The proposed correlation was subsequently used to develop a software using JavaScript. Undoubtedly, the proposed correlation and software are suitable for rapid and accurate simplification and prediction of natural gas compressibility factor.

A corresponding states-based method for the estimation of natural gas compressibility factors

2016 ◽  
Vol 216 ◽  
pp. 25-34 ◽  
Author(s):  
Arash Kamari ◽  
Farhad Gharagheizi ◽  
Amir H. Mohammadi ◽  
Deresh Ramjugernath
Keyword(s):  
Natural Gas ◽  
Corresponding States ◽  
Compressibility Factors ◽  
Gas Compressibility

Analysis of the Operating Mode Influence Onto Energy Consumption of a Natural Gas Storage Plant

2012 ◽  
Author(s):  
Gianmario L. Arnulfi ◽  
Carlo Cravero ◽  
Martino Marini
Keyword(s):  
Natural Gas ◽  
Operating Mode ◽  
Ideal Gas ◽  
Gas Dynamics Equations ◽  
Simulation Code ◽  
Lumped Parameter ◽  
Wide Range ◽  
Set Up ◽  
Operation Pressure ◽  
Time And Energy

Natural gas carrying from production sites to users’ facilities is made by marine shipping in liquid phase or by terrestrial pumping in gaseous phase through long pipelines. In the latter case several storage stations are distributed along the pipeline nets to move the natural gas from its deposits to users’ terminals. Storage stations are set up to compensate seasonal fluctuations of the consumer demand versus methane supply, storing the gas in various kinds of reservoirs. In most of such plants centrifugal compressors are used, where the energy and the time that a complete charge takes are affected by the operation scheduling of the compressor from the minimum to the maximum storage levels. While the pressure in the reservoir enforces the instant operation pressure, the flow rate is limited within a quite wide range. Here an in-house code, based on the lumped parameter approach and a quasi-steady dynamics, is applied to a complete charge. The natural gas behavior is modeled by the pseudo-ideal gas in order to get a fair accuracy keeping the usual gas dynamics equations. The compression path has been parameterized and a multi objective optimization, embedding the simulation code, has been implemented to find the most suitable management of the compression station for the minimization of time and energy. The most significant paths are analyzed to pick out the effects of the compression strategy.

scholarly journals Elaboration and pilot testing of a technology for production of sheet rolled products of cryogenic grade steels for liquidized natural gas storing

2020 ◽  
Vol 76 (3) ◽  
pp. 222-227
Author(s):  
I. F. Pemov ◽  
E. V. Yakushev ◽  
S. P. Zubov ◽  
A. A. Pridein ◽  
L. V. Prokopenko ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Thermal Treatment ◽  
Natural Gas ◽  
World Economy ◽  
Cryogenic Equipment ◽  
Wide Range ◽  
Negative Temperatures ◽  
Domestic Practice ◽  
Materials Used ◽  
Nickel Manganese

The liquidized natural gas (LPG) as well as other liquidized gases, as oxygen, nitrogen, ethylene etc. are widely used in the today’s world economy. A perspective of LPG and liquidized gases application presented, foreign and domestic experience in production of materials, used for manufacturing tanks and reservoirs, intended for storing and transporting of LPG, considered. Influence of chemical composition of cryogenic steels on resistivity to fragile destruction at negative temperatures studied. Influence of various alloying elements, including nickel, manganese, chrome, molybdenum and other elements on operating properties of cryogenic steels were also studied. Specialists of JSC “Ural Steel” together with scientists of JSC “NPO “CNIITMASH” elaborated a comprehensive technology of industrial production of plates of cryogenic steels. Based on literature data, domestic practice of designing and manufacturing cryogenic equipment, specifications of the required application plates were elaborated and approved. The rolling of plates of wide range of thickness of pilot heat 0H6 steel was carried out. At present, the thermal treatment modes of the 0H6 steel rolled products are being adjusted.

Ignition Studies of C1-C7 Natural Gas Blends At Gas-Turbine Relevant Conditions

2021 ◽  
Author(s):  
Amrit Sahu ◽  
A.A.E.S Mohamed ◽  
Snehashish Panigrahy ◽  
Gilles Bourque ◽  
Henry Curran
Keyword(s):  
Natural Gas ◽  
Gas Turbine ◽  
Gas Mixtures ◽  
Rapid Compression Machine ◽  
Temperature Range ◽  
Auto Ignition ◽  
Wide Range ◽  
Model Predictions ◽  
Detailed Kinetic Model ◽  
Sensitization Effect

Abstract New ignition delay time measurements (IDT) of natural gas mixtures enriched with small amounts of n-hexane and n-heptane were performed in a rapid compression machine to interpret the sensitization effect of heavier hydrocarbons on auto-ignition at gas-turbine relevant conditions. The experimental data of natural gas mixtures containing alkanes from methane to n-heptane were carried out over a wide range of temperatures (840-1050 K), pressures (20-30 bar), and equivalence ratios (f = 0.5 and 1.5). The experiments were complemented with numerical simulations using a detailed kinetic model developed to investigate the effect of n-hexane and n-heptane additions. Model predictions show that the addition of even small amounts (1-2%) of n-hexane and n-heptane can lead to an increase in reactivity by ~40-60 ms at a temperature of 700 K. The IDTs of these mixtures decrease rapidly with an increase in the concentration of up to 7.5% but becomes almost independent of the C6/C7 concentration &gt;10%. This sensitization effect of C6 and C7 is also found to be more pronounced in the temperature range 700-900 K compared to that at higher temperatures (&gt;900 K). The reason is attributed to the dependence of IDT primarily on H2O2(+M)??H+?H (+M) at higher temperatures while the fuel-dependent reactions such as H-atom abstraction, RO2 dissociation, or Q OOH+O2 reactions are less important compared to the temperature range 700-900 K, where they are very important.

Sign in / Sign up

Export Citation Format

Share Document