Hydrate Formation of a Synthetic Natural Gas Mixture in Aqueous Solutions Containing Electrolyte, Methanol, and (Electrolyte + Methanol)

1998 ◽  
Vol 43 (2) ◽  
pp. 178-182 ◽  
Author(s):  
Dong-Hai Mei ◽  
Jian Liao ◽  
Ji-Tao Yang ◽  
Tian-Min Guo
Keyword(s):  
Natural Gas ◽  
Aqueous Solutions ◽  
Hydrate Formation ◽  
Gas Mixture ◽  
Synthetic Natural Gas

Measurement and correlation of the volumetric properties of a synthetic natural gas mixture

1985 ◽  
Vol 19 (3) ◽  
pp. 259-271 ◽  
Author(s):  
Jørgen Mollerup ◽  
Per Angelo
Keyword(s):  
Natural Gas ◽  
Volumetric Properties ◽  
Gas Mixture ◽  
Synthetic Natural Gas

Experimental study on gas hydrate formation from natural gas mixture

2014 ◽  
Vol 18 ◽  
pp. 47-52 ◽  
Author(s):  
V. Mohebbi ◽  
R.M. Behbahani
Keyword(s):  
Experimental Study ◽  
Natural Gas ◽  
Gas Hydrate ◽  
Hydrate Formation ◽  
Gas Mixture ◽  
Gas Hydrate Formation

PρTBehavior of a Lean Synthetic Natural Gas Mixture Using Magnetic Suspension Densimeters and an Isochoric Apparatus: Part I

2011 ◽  
Vol 56 (2) ◽  
pp. 212-221 ◽  
Author(s):  
M. Atilhan ◽  
S. Aparicio ◽  
S. Ejaz ◽  
D. Cristancho ◽  
K. R. Hall
Keyword(s):  
Natural Gas ◽  
Magnetic Suspension ◽  
Gas Mixture ◽  
Synthetic Natural Gas ◽  
Apparatus Part

scholarly journals Simulation of Hydrate Phase Boundary for Natural Gas Mixture with High CO2Content through Simulation

2019 ◽  
Vol 9 (2) ◽  
pp. 4030-4034
Keyword(s):  
Natural Gas ◽  
Gas Hydrates ◽  
Oil And Gas ◽  
Hydrate Formation ◽  
Gas Production ◽  
Gas Mixture ◽  
Oil And Gas Production ◽  
Equation Of States ◽  
Gas Molecules ◽  
Simulation Results

Gas hydrates are solid crystalline structures in which water molecules trap small guest gas molecules and encage them through hydrogen bonding. Gas hydrates are known to be problematic in flow assurance applications as they can form plug inside the pipelines during oil and gas production, transportation and processing. In order to inhibit hydrate formation thermodynamically, various chemicals including some alcohols e.g. methanol (MeOH), mono- ethylene glycol (MEG) are used as thermodynamic hydrate inhibitors (THIs). In this paper, a simulation study is performed using PVTsim software wherein it predicts the hydrate formation for pure CO2 solution mixture and CO2 -MEG solution mixture systems using different equation of states. These equations of states include Soave-Redlich-Kwong (SRK), SRK-Peneloux, Peng- Robinson (PR) and Peng-Robinson Peneloux. The simulation results obtained using these equation of states were validated with the experimental data and PRPenelouxEoS was found to be in better agreement. The hydrate formation regions are determined in between the pressure range of 10 to 110 bara for natural gas mixture containing high percentage of CO2 in it. The inhibitors are used in 5, 10 and 20 wt% concentrations. The hydrate inhibition efficiency increased with the increase in concentration. Simulation results showed that methanol performed better in comparison to the other inhibitors at all concentrations.

scholarly journals Green energy recovery by blending treated biogas into town gas pipeline networks

2021 ◽  
Vol 27 (4) ◽  
pp. 173-182
Author(s):  
Mario Ho Tak Cheung
Keyword(s):  
Natural Gas ◽  
Specific Gravity ◽  
Calorific Value ◽  
Quality Standard ◽  
Green Energy ◽  
Gas Pipeline ◽  
Gas Mixture ◽  
Mixing Ratio ◽  
Synthetic Natural Gas ◽  
Pipeline Networks

Biogas can be converted into treated biogas or synthetic natural gas, which can be blended into town gas pipeline network at a designed mixing ratio. Specific gravity and calorific value of biogas are adjusted to satisfy gas safety and quality standard. Carbon dioxide pressure swing adsorption is selected and applied for specific gravity reduction and calorific value enrichment. 95% nitrogen, defined according to the flammability plot, is mixed with biogas for tuning the calorific value at the end of the process end. Gas interchangeability of the gas mixture of treated biogas and town gas was predicted by using maximum combustion potential (MCP) chart and their maximum mixing ratio for safe use was indicated. Gas interchangeability of the gas mixture was tested to confirm the prediction. The South East New Territories Processing Facilities were designed and built according to the above principle, and has been in operation to convert biogas into synthetic natural gas successfully since 2017.

scholarly journals Insights into kinetic inhibition effects of MEG, PVP, and L-tyrosine aqueous solutions on natural gas hydrate formation

2020 ◽  
Author(s):  
Amir Saberi ◽  
Abdolmohammad Alamdari ◽  
Ali Rasoolzadeh ◽  
Amir H. Mohammadi
Keyword(s):  
Natural Gas ◽  
Aqueous Solutions ◽  
Gas Hydrate ◽  
Induction Time ◽  
Hydrate Formation ◽  
View Point ◽  
Natural Gas Hydrate ◽  
Time Data ◽  
Gas Hydrate Formation ◽  
Gas Consumption

Abstract It is necessary to understand all the prerequisites, which result in gas hydrate formation for safe design and control of a variety of processes in petroleum industry. Thermodynamic hydrate inhibitors (THIs) are normally used to preclude gas hydrate formation by shifting hydrate stability region to lower temperatures and higher pressures. Sometimes, it is difficult to avoid hydrate formation and hydrates will form anyway. In this situation, kinetic hydrate inhibitors (KHIs) can be used to postpone formation of gas hydrates by retarding hydrate nucleation and growth rate. In this study, two kinetic parameters including natural gas hydrate formation induction time and the rate of gas consumption were experimentally investigated in the presence of monoethylene glycol (MEG), L-tyrosine, and polyvinylpyrrolidone (PVP) at various concentrations in aqueous solutions. Since hydrate formation is a stochastic phenomenon, the repeatability of each kinetic parameter was evaluated several times and the average values for the hydrate formation induction times and the rates of gas consumption are reported. The results indicate that from the view point of hydrate formation induction time, 2 wt% PVP and 20 wt% MEG aqueous solutions have the highest values and are the best choices. It is also interpreted from the results that from the view point of the rate of gas consumption, 20 wt% MEG aqueous solution yields the lowest value and is the best choice. Finally, it is concluded that the combination of PVP and MEG in an aqueous solution has a simultaneous synergistic impact on natural gas hydrate formation induction time and the rate of gas consumption. Furthermore, a semi-empirical model based on chemical kinetic theory is applied to evaluate the hydrate formation induction time data. A good agreement between the experimental and calculated hydrate formation induction time data is observed.

scholarly journals Gas Hydrate Formation Phase Boundary Behaviour of Synthetic Natural Gas System of the Keta Basin of Ghana

2017 ◽  
Vol 10 (1) ◽  
pp. 64-72 ◽  
Author(s):  
Eric Broni-Bediako ◽  
Richard Amorin ◽  
Cornelius B. Bavoh
Keyword(s):  
Natural Gas ◽  
Phase Boundary ◽  
Gas Hydrates ◽  
Gas Hydrate ◽  
Hydrate Formation ◽  
Simulation Software ◽  
Gas Composition ◽  
Synthetic Natural Gas ◽  
Gas Hydrate Formation ◽  
Formation Phase

Background:Gas hydrates are considered as a major threat to the oil and gas flow assurance industry. At high pressure and low temperature conditions, gas hydrates form in pipelines and production facilities leading to pipeline blockages, high removal cost, environmental hazards and loss of lives. For a successful prevention of gas hydrate formation, predicting the hydrate formation phase boundary of hydrocarbon fluid composition becomes very necessary.Objective and Method:In this study, computer simulation software called PVTSim was used to predict hydrate formation phase boundary of synthetic natural gas composition of the Keta basin of Ghana at pressure and temperature ranges of 43.09 bar - 350 bar and 12.87 °C - 27.29 °C respectively. The effect of changes in natural gas composition (N2and H2S) and the presence of four commonly used thermodynamic gas hydrate inhibitors (methanol, ethanol, diethylene glycol and monoethylene glycol) on the hydrate formation phase boundary is also discussed. Prior to the study, the accuracy of PVTSim was validated with the hydrate formation phase data in literature.Results and Conclusion:Results suggested that the hydrate formation phase boundary decreased with increasing N2composition and increased with increasing H2S composition, suggesting that, the presence of H2S increases the threat of hydrate formation. However, a reduction in hydrate formation threat was observed in the presence of all four commonly used gas hydrate thermodynamic inhibitors with methanol demonstrating the highest inhibition effect.

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