Hydrate Stability and Methane Recovery from Gas Hydrate through CH 4 –CO 2 Replacement in Different Mass Transfer Scenarios

Jyoti Shanker Pandey () and Nicolas von Solms
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Nicolas von Solms: Center for Energy Resource Engineering (CERE), Department of Chemical Engineering, Technical University of Denmark, Lyngby 2800, Denmark

Energies, 2019, vol. 12, issue 12, 1-20

Abstract: CH 4 –CO 2 replacement is a carbon-negative, safer gas production technique to produce methane gas from natural gas hydrate reservoirs by injecting pure CO 2 or other gas mixtures containing CO 2 . Laboratory-scale experiments show that this technique produces low methane volume and has a slow replacement rate due to the mass transfer barrier created due to impermeable CO 2 hydrate layer formation, thus making the process commercially unattractive. This mass-transfer barrier can be reduced through pressure reduction techniques and chemical techniques; however, very few studies have focused on depressurization-assisted and chemical-assisted CH 4 –CO 2 replacement to lower mass-transfer barriers and there are many unknowns. In this work, we qualitatively and quantitatively investigated the effect of the pressure reduction and presence of a hydrate promoter on mixed hydrate stability, CH 4 recovery, and risk of water production during CH 4 –CO 2 exchange. Exchange experiments were carried out using the 500 ppm sodium dodecyl sulfate (SDS) solution inside a high-pressure stirred reactor. Our results indicated that mixed hydrate stability and methane recovery depends on the degree of pressure reduction, type, and composition of injected gas. Final selection between CO 2 and CO 2 + N 2 gas depends on the tradeoff between mixed hydrate stability pressure and methane recovery. Hydrate morphology studies suggest that production of water during the CH 4 –CO 2 exchange is a stochastic phenomenon that is dependent on many parameters.

Keywords: methane recovery; hydrate stability; CO 2 + N 2 injection; sodium dodecyl sulfate; mass transfer; morphology studies (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (12)

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