ISSN Online: 2377-424X
ISBN Print: 978-1-56700-474-8
ISBN Online: 978-1-56700-473-1
International Heat Transfer Conference 16
MAGNETIC RESONANCE IMAGING FOR OBSERVATION OF METHANE HYDRATE REFORMATION NEAR WELLBORE USING DEPRESSURIZATION
Аннотация
Methane hydrate has great value of commercial exploitation as clean energy and depressing exploit is the most
efficient way. However, the drastic gas-liquid two-phase flow between reservoir and wellbore causing hydrate
reformation which may reduce the gas production. This paper observes hydrate dissociation near wellbore
using magnetic resonance imaging(MRI). In this experiment, placing a porous throttle plate above the nuclear
magnetic tube to simulate wellbore. Changing different initial water saturation and methane injection volume
to get different hydrate saturation and then starting hydrate depressurization using same back pressure. From
the images of MRI, the process of hydrate depressurization starts from the wall of nuclear magnetic tube
because the drastic gas-liquid two-phase flow increase heat and mass transfer along the wall and cause hydrate
reformation near center region of porous throttle plate. Comparing experimental data, methane hydrate is easily
reformation when it is dissociation which is formed with higher initial water saturation. Generally speaking,
hydrate depressurization with heat injection could increase gas production. Therefore, making sure the hydrate
reformation region with a minimum of partly heat injection to get higher gas production.
Ключевые слова:
Thermophysical properties, Porous media, nonuniform heat transfer, methane hydrate, refomation, MRI