Carbonates precipitation in MEG loops – A comparative study of South Pars and Bass Strait gas fields

Babu, Dasari Ram; Hosseinzadeh, Mohammad; Ehsaninejad, A.; Babaei, R.; Kashkooli, M.R.; Akbary, Hamid

doi:10.1016/j.jngse.2015.09.035

Cited by 11 publications

(13 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Alternatively, the removal of MDEA within EG regeneration systems operating under pH stabilization control is essential following formation water breakthrough. , The combined presence of MDEA (high pH) and divalent cations including calcium, magnesium, and barium presents a scaling risk within both transportation lines and equipment operating at high temperature (heat exchangers, EG regeneration system). , MDEA will react in the presence of CO 2 to form bicarbonate ,, facilitating the formation of scaling products including CaCO 3 . pH stabilization chemicals such as MDEA must therefore be removed to facilitate switch over to more scaling friendly film forming corrosion inhibitors (FFCIs).…”

Section: Introductionmentioning

confidence: 99%

Experimental Vapor–Liquid Equilibrium Data for Binary Mixtures of Methyldiethanolamine in Water and Ethylene Glycol under Vacuum

et al. 2018

View full text Add to dashboard Cite

Methyldiethanolamine (MDEA) is a widely used chemical in the natural gas processing industry as a solvent for CO 2 and H 2 S capture and as a basic compound for pH stabilization corrosion control. During pH stabilization corrosion control, the removal of MDEA during the (mono)ethylene glycol (MEG) regeneration process may occur under vacuum conditions during reclamation in which the removal of salt cations is performed. Isobaric vapor−liquid equilibrium data for the binary MEG−MDEA system is presented at (20, 10 and 5) kPa and water−MDEA system at (40, 20, 10) kPa to simulate its behavior during MEG reclamation under vacuum. Vapor and liquid equilibrium concentrations of MDEA were measured using a combination of ion chromatography and refractive index. The generated experimental VLE data were correlated to the UNIQUAC, NRTL, and Wilson activity coefficient models, and the respective binary parameters were regressed.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental Vapor–Liquid Equilibrium Data for Binary Mixtures of Methyldiethanolamine in Water and Ethylene Glycol under Vacuum

et al. 2018

View full text Add to dashboard Cite

show abstract

“…However, the performance of oxygen scavengers in the presence of TAL-MEG solutions has received little to no attention. Furthermore, during the production of natural gas, the breakthrough of formation water is expected leading to the introduction of monovalent and divalent mineral ions into the MEG regeneration system (AlHarooni et al, 2015;Babu et al, 2015;Halvorsen et al, 2007;Sandengen, 2006). The ratio of divalent cations to bicarbonate or sulfate ions plays a crucial role in determining how scale formed inside pipelines and on the top of hot surfaces (Al Helal et al, 2017;Lu et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

“…The ratio of divalent cations to bicarbonate or sulfate ions plays a crucial role in determining how scale formed inside pipelines and on the top of hot surfaces (Al Helal et al, 2017;Lu et al, 2010). Moreover, the presence of mineral salts in large quantities can pose significant operational constraints during MEG regeneration due to their tendency to cause scaling at elevated pH and temperature (Babu et al, 2015;Kan et al, 2005;Kan et al, 2003). Likewise, the introduction of organic acids including acetic, propanoic and butanoic can occur through the condensed water phase if such acids are present within the reservoir (Latta et al, 2013;Lehmann et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Performance of erythorbic acid as an oxygen scavenger in thermally aged lean MEG

Helal

Soames

Gubner

et al. 2018

Journal of Petroleum Science and Engineering

View full text Add to dashboard Cite

The objective of this work is to further evaluate the performance of the erythorbic acid oxygen scavenger designed by (Kundu and Seiersten, 2017) within 85% wt. Thermally Aged Lean Mono Ethylene Glycol (TAL-MEG). Experiments were performed at two levels of dissolved oxygen concentrations including 1000ppb and >7500ppb at pH values of 6, 9 and 11. Furthermore, the erythorbic acid oxygen scavenger was evaluated under conditions representative of an industrial MEG regeneration system in terms of salt and organic acid concentrations to replicate field usage. Strong performance of erythorbic acid in combination with manganese and diethylethanolamine (DEAE) was observed under field conditions suggesting that erythorbic acid may provide an attractive alternative oxygen scavenger for use in the oil and gas industry in place of traditional sulfite based scavengers.However, the results generated within TAL-MEG showed a reduction in the performance of erythorbic acid oxygen scavenger when compared to fresh MEG solution. Moreover, results confirmed that varying acetic acid concentration did not affect oxygen scavenger performance within TAL-MEG. It was observed that the pH of the solution was the primary factor in determining the performance of the erythorbic oxygen scavenger tested with insufficient oxygen removal achieved at a pH of 6. In contrast, strong performance was achieved at pH 9 and 11 successfully reaching below 20ppb dissolved oxygen concentration within a reasonable timeframe with little to no impact due to the presence of mineral salt ions and organic acids.

show abstract

“…The prevention and mitigation of salt precipitation within process piping and equipment is a crucial aspect of effectively designing a MEG regeneration system. Typically, the most frequently encountered salts in MEG processing occur from the presence of the monovalent cations sodium, Na + potassium, K + and the divalent cations calcium, Ca 2+ iron, Fe 2+ and magnesium, Mg 2+ (Latta et al 2016, Babu et al 2015. Within the confines of the MEG regeneration column, the primary impact of salt occurs due to the precipitation of the divalent salts, CaCO3, FeCO3, FeS and Mg(OH)2 within the columns internals and reboiler unit.…”

Section: Salt Precipitation Within Meg Systemsmentioning

confidence: 99%

Recovery of mono-ethylene glycol by distillation and the impact of dissolved salts evaluated through simulation of field data

Zaboon

Soames

Ghodkay

et al. 2017

Journal of Natural Gas Science and Engineering

View full text Add to dashboard Cite

This study was conducted to investigate the operation of a packed distillation column and analyse its performance during the separation of mono-ethylene glycol from water. The column was designed and constructed by the Curtin Corrosion Engineering Industry Centre (CCEIC) and operated in collaboration with a reputable oil company to generate experimental field data. A secondary investigation was then performed into the impacts of dissolved salts within the rich MEG feed upon the purity of the lean MEG product. It was observed through application of the FUG shortcut distillation design equations that six equilibrium stages were required to attain the experimental separations reported under continuous operation of the column. It was further determined that the packing utilised within the column had a Height Equivalent to a Theoretical Plate (HETP) of approximately 0.34 metres when no dissolved salts were present corresponding to an estimated packing height of approximately 1.7 metres. The impact of dissolved salts upon the performance of the column was evident through lower lean MEG purities observed during experimental operation of the column in comparison to salt free trials. The reduction in column performance was reaffirmed by Aspen HYSYS and Aspen Plus simulations of the field data, where salt trials resulted in lean MEG purities noticeably less than corresponding salt free experimental trials and simulated predictions. Overall, it was observed that the presence of dissolved salts during operation led to a reduction in MEG mass fraction of the final lean MEG product by on average 7.2%. The impact of dissolved salts on lean MEG purity was successfully predicted by Aspen Plus simulation with an average accuracy of 1.61% through the inclusion of monovalent salt cations using the ELECNRTL equation of state with modified binary parameters. The reduction in lean MEG purity was attributed to boiling point elevation of the MEG-Water solution and the impact of the dissolved salts on the systems vapour liquid equilibrium.

show abstract

Carbonates precipitation in MEG loops – A comparative study of South Pars and Bass Strait gas fields

Cited by 11 publications

References 4 publications

Experimental Vapor–Liquid Equilibrium Data for Binary Mixtures of Methyldiethanolamine in Water and Ethylene Glycol under Vacuum

Experimental Vapor–Liquid Equilibrium Data for Binary Mixtures of Methyldiethanolamine in Water and Ethylene Glycol under Vacuum

Performance of erythorbic acid as an oxygen scavenger in thermally aged lean MEG

Recovery of mono-ethylene glycol by distillation and the impact of dissolved salts evaluated through simulation of field data

Contact Info

Product

Resources

About