Computation of Hydrate Phase Equilibria and Its Application to the Yamal-Europe Gas Pipeline

Osiadacz, Andrzej J.; Uilhoorn, Ferdinand E.; Chaczykowski, Maciej

doi:10.1080/10916460701700336

Cited by 7 publications

(10 citation statements)

References 15 publications

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“…The program could not only calculate the temperature at given pressures and the pressure at given temperatures of pure water, but could also simulate the temperature and pressure of seawater and pore water under different salinities. Many scholars carried out theoretical analyses and experimental research to study the phase equilibrium conditions of gas hydrate and further established the relations between critical temperature and pressure in the phase transformation of gas hydrates with different gas components . In the temperature‐pressure diagram, the relationship can be represented by the phase equilibrium curve, and the pressure parameters can be converted into depth parameters when only considering the hydrostatic pressure of overlying strata.…”

Section: Methodsmentioning

confidence: 99%

“…Many scholars carried out theoretical analyses and experimental research to study the phase equilibrium conditions of gas hydrate and further established the relations between critical temperature and pressure in the phase transformation of gas hydrates with different gas components. [27][28][29][30][31][32][33][34] In the temperature-pressure diagram, the relationship can be represented by the phase equilibrium curve, and the pressure parameters can be converted into depth parameters when only considering the hydrostatic pressure of overlying strata. Therefore, the depth-temperature diagram can be used to replace the pressure-temperature diagram.…”

Section: Methodsmentioning

confidence: 99%

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A preliminary study of the gas hydrate stability zone in a gas hydrate potential region of China

Xiao

Zou

Yang

et al. 2019

Energy Science & Engineering

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Due to its significance for gas hydrate accumulation, the gas hydrate stability zone (GHSZ) is an essential condition for successful gas hydrate exploration and is usually controlled by three main factors: gas components, geothermal gradient, and permafrost thickness. Based on the core and conventional log data of gas hydrate potential region, the CSMHYD program was adopted to simulate the influences of above three factors on the thickness of the GHSZ. When the gas components of the gas hydrate were CH4, C2H6, and C3H8, with the CH4 percentage ranging from 50% to 100%, the average GHSZ thickness can reach 1000 m according to the forward simulation results. When the gas hydrate was composed of CH4 and one of C2H6, C3H8, H2S, and CO2, the influence order of the above four gases on the thickness of GHSZ is as follows: H2S ＞ C2H6 ＞ C3H8 ＞ CO2. Under the gas components of 90% CH4, 5% C2H6, and 5% C3H8, the thickness of GHSZ decreased rapidly as the geothermal gradient increased following an exponential relation with a correlation of 99.92% and increased slowly as permafrost thickness increased following a linear relation with a correlation of 99.9%. In addition, the thickness of a gas hydrate favorable reservoir was determined by comprehensive log methods as 500 m. We conclude that a reservoir within 500 m below the permafrost layer is favorable for gas hydrate reservoir formation.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

A preliminary study of the gas hydrate stability zone in a gas hydrate potential region of China

Xiao

Zou

Yang

et al. 2019

Energy Science & Engineering

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“…Drilling the wellbore is the first and essential step to explore the gas hydrate bearing sediments in permafrost regions [18] . The nature of borehole instability essentially is a common problem caused by mechanically unbalanced borehole pressures.…”

Section: Wellbore Stability Conditionsmentioning

confidence: 99%

Effect of Gas Hydrate Drilling Fluids Using Low Solid Phase Mud System in Plateau Permafrost

Chen

Wang

2014

Procedia Engineering

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Designing and optimizing suitable drilling fluids for permafrost exploration to get gas hydrates at low temperature is one of most essential and urgent demands in the current research on exploration and exploitation of gas hydrates. The issue on rheological properties and maintaining borehole stability of drilling fluids is especially important to focus on. This work studies the gas hydrates and wellbore stability conditions and designs a low solid phase mud system with chemical additives. The measured values and effect on rheological and physical properties of the drilling fluids with different type and concentration of additives are studied. Hydration expansion is tested in laboratory to estimate the hydration property of different additives. It is showed that the drilling fluids with a dose of 1 % HT have suitable rheological and physical properties at low temperature. Potassium ion performs well in preventing borehole instability and gas hydrate dissociation. According to the study, the optimized drilling fluid formula is: base mud + 10 % NaCl + 5 % KCl + 1 ‰ NaOH + 1 % HT.

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“…The model has been simultaneously compared with CSMHYD, a thermodynamic model developed by Sloan (1998). Details of the hydrate model used in this paper, including verification with experimental data can be found in Osiadacz et al (2009) and in Osiadacz et al (2012).…”

Section: Hydrate Modelmentioning

confidence: 99%

Assessing Hydrate Formation in Natural Gas Pipelines Under Transient Operation / Ocena zjawiska tworzenia się hydratów w warunkach nieustalonego przepływu gazu w gazociągach

Osiadacz¹

2013

Archives of Mining Sciences

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This work presents a transient, non-isothermal compressible gas flow model that is combined with a hydrate phase equilibrium model. It enables, to determine whether hydrates could form under existing operating conditions in natural gas pipelines. In particular, to determine the time and location at which the natural gas enters the hydrate formation region. The gas flow is described by a set of partial differential equations resulting from the conservation of mass, momentum, and energy. Real gas effects are determined by the predictive Soave-Redlich-Kwong group contribution method. By means of statistical mechanics, the hydrate model is formulated combined with classical thermodynamics of phase equilibria for systems that contain water and both hydrate forming and non-hydrate forming gases as function of pressure, temperature, and gas composition. To demonstrate the applicability a case study is conducted.Keywords: hydrates, pipeline, natural gas, transient gas flow W artykule omówiono model nieustalonego, nieizotermicznego przepływu gazu w rurociągu, który uwzględnia model gazowego hydratu w stanie równowagi fazowej. To pozwala określić czy hydraty mogą tworzyć się w określonych warunkach eksploatacji gazociągu a w szczególności określić czas oraz miejsce ich tworzenia. Przepływ gazu jest opisany za pomocą układu równań różniczkowych cząstkowych utworzonych w oparciu o równanie zachowania masy, pędu, energii oraz równanie stanu wykorzystujące równanie Soave-Redlich-Kwonga. Za pomocą mechaniki statystycznej, model hydratu jest formułowany w oparciu o równowagę fazową dla układów zawierających wodę oraz gazy tworzące i nie tworzące hydraty jako funkcję ciśnienia, temperatury oraz składu gazu.

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Computation of Hydrate Phase Equilibria and Its Application to the Yamal-Europe Gas Pipeline

Cited by 7 publications

References 15 publications

A preliminary study of the gas hydrate stability zone in a gas hydrate potential region of China

A preliminary study of the gas hydrate stability zone in a gas hydrate potential region of China

Effect of Gas Hydrate Drilling Fluids Using Low Solid Phase Mud System in Plateau Permafrost

Assessing Hydrate Formation in Natural Gas Pipelines Under Transient Operation / Ocena zjawiska tworzenia się hydratów w warunkach nieustalonego przepływu gazu w gazociągach

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