Abo Bibliothek: Guest

ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

MAGNETIC RESONANCE IMAGING FOR OBSERVATION OF METHANE HYDRATE REFORMATION NEAR WELLBORE USING DEPRESSURIZATION

Get access (open in a dialog) DOI: 10.1615/IHTC16.tpm.023416
pages 8858-8865

Abstrakt

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.