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Download fileA Rheological Study of Parameters That Influence the Formation of Cyclopentane Hydrates
journal contribution
posted on 2021-10-29, 19:06 authored by Gustavo
A. B. Sandoval, Marcio Couto Ozorio, Mônica F. Naccache, Paulo R. de Souza Mendes, Amadeu K. Sum, Leandro Valim, Adriana TeixeiraIn
the oil industry, gas hydrates formed during oil and gas production
are one of the main issues in flow assurance. In extreme conditions
of high pressure and low temperature found in ultradeep oil wells,
hydrates crystals can form, agglomerate, and accumulate in the flowlines.
Moreover, hydrates can be used for energy storage and chemical separation,
such as seawater desalination. As such, understanding the onset of
hydrate formation, its growth, and its behavior under shear are of
great interest. This work presents a rheological analysis of cyclopentane
hydrates formed in water-in-oil emulsions. We present the rheological
behavior from hydrate formation until a quasi steady-state regime
is obtained and analyze the influence of some important parameters
such as pretreatment temperatures, cooling/heating rates, and final
temperature of cyclopentane hydrate formation. Other parameters explored
are shear rate and water cut. The rheological behavior is obtained
using a rotational rheometer at temperatures above the water freezing
point to avoid the influence caused by the presence of ice. Transient
tests are performed to obtain the hydrate induction and growth times.
Steady state and oscillatory tests are obtained to evaluate the resulting
hydrate slurry rheology. It is observed that the slurries show elasticity
and a shear thinning behavior, caused likely by both mechanisms, the
breakdown of the hydrate structures, and the alignment of hydrate
agglomerates to the flow.
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slurries show elasticitylow temperature foundwater freezing pointultradeep oil wellscyclopentane hydrates formedgas hydrates formedshear thinning behaviorcyclopentane hydrate formationcyclopentane hydratesgas productionfinal temperaturehydrates crystalshydrate structureshydrate inductionhydrate formationhydrate agglomerateswork presentswater cuttransient testssteady statestate regimeshear rateseawater desalinationrotational rheometerrheological studyrheological behaviorrheological analysisquasi steadyoscillatory testsoil industryoil emulsionsmain issueshigh pressureheating ratesgreat interestextreme conditionsenergy storagechemical separationcaused likely