Multiphase Flash in Presence of Hydrates and Mixture of Inhibitors

Sirino, Thales; Neto, Moisés Marcelino; Bertoldi, Dalton; Morales, Rigoberto E. M.; Sum, Amadeu K.

doi:10.26678/abcm.cobem2017.cob17-1234

Cited by 2 publications

(12 citation statements)

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“…On the vertical axis, the result is shown as percent deviation, calculated with eq 2 for each system indicated on the horizontal axis. Figure 5b shows the consistency results of the heat of dissociation, with Experimental data from this work (black diamonds) compared with available literature data (yellow triangles 33 ; green squares 23 ; yellow circles 22 ; red squares 21 ; green triangles 16 ; red circles; 9 green circle, Q 2 26 ; yellow square, Q 2 34 ; and red triangle, Q 2 35 ) and predictions by models (black solid lines, Multiflash 27 ; blue solid line, PVTsim 28 ; dash-dot line, CSMGem 29 ; and red solid line, model by Sirino et al 30 ). the vertical axis calculated with eq 4.…”

Section: Resultsmentioning

confidence: 79%

“…The blue continuous lines are predictions by PVTsim, 28 and the black dash-dot line is from CSMGem. 29 The red continuous line is the prediction from the model by Sirino et al 30 The H−L CO 2 −L W equilibrium curve has a significantly larger slope than that of the H−V CO 2 −L W curve. This means that small temperature steps are equivalent to large equilibrium pressure steps when compared to the region below Q 2 , which is a characteristic of a system with the two liquid phases forming hydrates.…”

Section: Resultsmentioning

confidence: 93%

“…The most difficult system to predict was a mixture of 5 wt % NaCl and 30 wt % MEG. For this system, although CSMGem showed promising results for some of the other systems, it greatly over predicted the inhibition effect, having an AAD of 10.31 K. The Multiflash prediction had its highest error with respect to all of the systems it predicted, with an AAD of 1.27 K. The best prediction for this system was by PVTsim, which had an AAD of 0.28 K, followed by the Sirino et al 30 model with an AAD of 1.23 K.…”

Section: T T N Aadmentioning

confidence: 86%

“…The AADs calculated for all of the systems from Table 4 are summarized in Figure 7. The red bars correspond to the model by Sirino et al, 30 the dark gray bars are from Multiflash, the blue bars are from PVTsim, and the green bars are from CSMGem. For the pure water system, predictions yielded the lowest discrepancies when compared to experimental data.…”

Section: T T N Aadmentioning

confidence: 99%

“…The consistency of the acquired data was verified through the Clausius−Clapeyron equation and water activity. Finally, the accuracies of four different prediction tools (Multiflash, 27 PVTsim, 28 CSMGem, 29 and the Sirino et al 30 model) were evaluated.…”

Section: Introductionmentioning

confidence: 99%

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Phase Equilibrium of Carbon Dioxide Hydrates Inhibited with MEG and NaCl above the Upper Quadruple Point

et al. 2019

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Exploration of oil fields with high concentrations of carbon dioxide brings new challenges to the oil and gas industry. The high pressures reached in production pipelines can cause the condensation of the gas phase, characterizing the appearance of an upper quadruple point in the hydrate phase diagram. To prevent the formation of hydrates, the use of thermodynamic inhibitors, such as alcohols and glycols, is common in the industry. In addition, water from oil production is naturally inhibited with salts, such as NaCl. In this work, equilibrium data not previously reported for CO2 hydrates inhibited with MEG and NaCl were determined for pressures between 8.5 and 25 MPa using an isobaric experimental procedure. By the Clausius–Clapeyron relation and concepts of water activity, the consistency of the data was evaluated with promising results. A comparison of the measured data obtained in this work with prediction tools (Multiflash, PVTsim, and CSMGem) and the model by Sirino et al.30 [Fluid Phase Equilib.20184754563] was done.

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Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 93%

Section: T T N Aadmentioning

confidence: 86%

Section: T T N Aadmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Phase Equilibrium of Carbon Dioxide Hydrates Inhibited with MEG and NaCl above the Upper Quadruple Point

et al. 2019

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Experimental Phase Equilibria of Carbon Dioxide and Methane Hydrates in the Presence of 2-Propanol and Sodium Chloride

et al. 2022

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In oil exploration and production, 2-propanol is a chemical often used during stimulation and to improve workover operating conditions. It is investigated as a potential thermodynamic inhibitor of hydrate formation, and its use would be advantageous from an economic standpoint. However, some reports point out that 2-propanol can promote hydrate formation, especially in systems with either CH4 or CO2 acting as auxiliary gas. New experimental data for phase equilibrium of inhibited carbon dioxide and methane hydrates were obtained by the isochoric experimental method in a high-pressure cell, for pressures between 20 and 260 bar, at concentrations ranging from 5 to 25 wt % of 2-propanol. New experimental data on mixtures of 2-propanol and NaCl (at a fixed concentration of 5 wt %) were also obtained in order to evaluate the behavior of this alcohol in saline mixtures. 2-Propanol was included in an in-house software previously developed. The thermodynamic model is based upon the cubic plus association (CPA) equation of state for the fluid phases and a statistical approach based on van der Waals–Platteeuw theory for the hydrate phase. Based on the results obtained in this work, it was observed that 2-propanol has a hybrid behavior, highly dependent on the gas system composition. For CO2 systems, 2-propanol has been characterized as a CO2 hydrate inhibitor and a CH4 hydrate promoter, collaborating on the structural transition from the sI type to the sII type. The inhibiting effect of 2-propanol on carbon dioxide hydrate systems was not compromised. Software deviations did not exceed AAD = 17%, for both systems, bringing reliability of the model and optimized parameters. In salt mixtures, 2-propanol is a thermodynamic inhibitor for both gases, and at concentrations higher than 10 wt %, 2-propanol had a satisfactory inhibition effect.

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Multiphase Flash in Presence of Hydrates and Mixture of Inhibitors

Cited by 2 publications

References 0 publications

Phase Equilibrium of Carbon Dioxide Hydrates Inhibited with MEG and NaCl above the Upper Quadruple Point

Phase Equilibrium of Carbon Dioxide Hydrates Inhibited with MEG and NaCl above the Upper Quadruple Point

Experimental Phase Equilibria of Carbon Dioxide and Methane Hydrates in the Presence of 2-Propanol and Sodium Chloride

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