PHASE ENVELOPE CONSTRUCTION FOR MIXTURES USING HIGHLY ACCURATE HELMHOLTZ ENERGY EQUATION OF STATE

2020 ◽  
Vol 6 (4) ◽  
pp. 8-27
Author(s):  
Taiming Luo ◽  
Alexei Yu. Chirkov
Keyword(s):  
Equation Of State ◽  
Energy Equation ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Low Pressure ◽  
Helmholtz Energy ◽  
Gas Industry ◽  
Helmholtz Energy Equation ◽  
Robinson Equation ◽  
Phase Envelope

Phase envelope construction for mixtures is very important in the oil and gas industry. The most widely used model for phase envelope construction is Peng — Robinson equation of state (PR-EOS) due to its simplicity. In order to construct phase envelopes of natural gas, a highly accurate Helmholtz energy equation of state GERG-2008 was proposed. In this work, the accuracy of phase envelopes calculated by a highly accurate equation of state GERG-2008, simplified GERG-2008 and traditional cubic PR-EOS was analyzed. The pressure-based algorithm is used to calculate phase envelopes. Phase envelopes of the methane—ethane mixtures were constructed and compared with reference data. The results show that phase envelopes can be constructed with GERG-2008 in high accuracy. PR-EOS has good accuracy in phase envelope construction under low pressure. The simplified GERG-2008 also works well under low pressure; however, as pressure increases, it performs worse than the simpler PR-EOS, especially in the vicinity of critical point. Besides, a modified density solver for the complicated GERG-EOS was proposed. Calculations show that the proposed density solver can provide reliable results.

scholarly journals Application of the SAFT-γ Mie group contribution equation of state to fluids of relevance to the oil and gas industry

2016 ◽  
Vol 416 ◽  
pp. 104-119 ◽  
Author(s):  
Vasileios Papaioannou ◽  
Filipe Calado ◽  
Thomas Lafitte ◽  
Simon Dufal ◽  
Majid Sadeqzadeh ◽  
...  
Keyword(s):  
Equation Of State ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Group Contribution ◽  
Gas Industry

A Helmholtz Energy Equation of State for Sulfur Dioxide

2016 ◽  
Vol 61 (8) ◽  
pp. 2859-2872 ◽  
Author(s):  
Kehui Gao ◽  
Jiangtao Wu ◽  
Penggang Zhang ◽  
Eric W. Lemmon
Keyword(s):  
Equation Of State ◽  
Sulfur Dioxide ◽  
Energy Equation ◽  
Helmholtz Energy ◽  
Helmholtz Energy Equation

To Increase the Efficiency of Low Pressure Gas Transportation in the Gunashli Energy Sector

2021 ◽  
Author(s):  
Mansur Elkhan Shahlarli
Keyword(s):  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Low Pressure ◽  
Solid Particles ◽  
Compressor Station ◽  
The Caspian Sea ◽  
Gas Industry ◽  
Wear And Tear ◽  
Gas Leaks

Abstract The role of the Caspian Sea in the development of the oil and gas industry for our country and the world is undeniable. The discovery of new fields creates conditions for the development of efficient and modern technologies. The need for energy causes us to move away from the shore day by day and encounter bigger obstacles with increasing depth. Gunashli field sites are located 120 km from the shore and at a depth of 80-150 m. Studies have shown that during the inter-site transport of low pressure gas, mechanical impurities and gas leaks accumulate in the part of the pipeline rising from the seabed to the platform, which prevents the flow of gas to the low pressure compressor station. Low-pressure gas enters the compressor station with liquids and mechanical mixtures, which leads to rapid wear and tear of the working parts of expensive compressor machines. Initially, according to d'Alambert principle, the forces acting on liquid and solid particles in a vertical pipe were investigated, then the results are shown. Due to this results, we have proposed a new design for cleaning the gas at the bottom of the sea and transferring it to the separator.

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