Hydrate bearing clayey sediments: Formation and gas production concepts
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ArticleAuthors
Jang, JaewonSantamarina, Carlos

KAUST Department
Ali I. Al-Naimi Petroleum Engineering Research Center (ANPERC)Earth Science and Engineering Program
Energy Resources and Petroleum Engineering
Physical Science and Engineering (PSE) Division
Date
2016-06-26Online Publication Date
2016-06-26Print Publication Date
2016-11Permanent link to this record
http://hdl.handle.net/10754/614887
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Hydro-thermo-chemo and mechanically coupled processes determine hydrate morphology and control gas production from hydrate-bearing sediments. Force balance, together with mass and energy conservation analyses anchored in published data provide robust asymptotic solutions that reflect governing processes in hydrate systems. Results demonstrate that hydrate segregation in clayey sediments results in a two-material system whereby hydrate lenses are surrounded by hydrate-free water-saturated clay. Hydrate saturation can reach ≈2% by concentrating the excess dissolved gas in the pore water and ≈20% from metabolizable carbon. Higher hydrate saturations are often found in natural sediments and imply methane transport by advection or diffusion processes. Hydrate dissociation is a strongly endothermic event; the available latent heat in a reservoir can sustain significant hydrate dissociation without triggering ice formation during depressurization. The volume of hydrate expands 2-to-4 times upon dissociation or CO2single bondCH4 replacement. Volume expansion can be controlled to maintain lenses open and to create new open mode discontinuities that favor gas recovery. Pore size is the most critical sediment parameter for hydrate formation and gas recovery and is controlled by the smallest grains in a sediment. Therefore any characterization must carefully consider the amount of fines and their associated mineralogy.Citation
Hydrate bearing clayey sediments: Formation and gas production concepts 2016, 77:235 Marine and Petroleum GeologySponsors
Support for this research was provided by DOE/NETL Methane Hydrate Project (DE-FC26-06NT42963). Additional support was provided by the Goizueta Foundation and KAUST’s endowment.Publisher
Elsevier BVJournal
Marine and Petroleum GeologyAdditional Links
http://linkinghub.elsevier.com/retrieve/pii/S0264817216301969ae974a485f413a2113503eed53cd6c53
10.1016/j.marpetgeo.2016.06.013