Temperature monitoring and their analysis of the methane hydrate first offshore production test in the eastern Nankai Trough
Abstract
Before, during and after the gas production, an intensive thermal monitoring program was applied to of the methane hydrate first offshore production test in the eastern Nankai Trough conducted in March 2013 as a part of MH21 research program. Temperature sensors installed in a production hole and two monitoring boreholes could detect gas-hydrate-dissociation-related temperature alterations in some particular intervals. The temperature profile information from the production borehole was used to analyze the major gas and water-producing zones using thermal energy balance and assumed fluid temperatures. The temperature data obtained in the two monitoring boreholes, in which data acquisition had started one year before the production test, and continued for 4 months after the test, could derive the information of hydrate dissociation-situation of each particular layer. By applying a simple numerical model, a semi-qualitative analysis of is performed to relate the gas hydrate dissociation and reservoir characteristics through the observed temperature changes. Moreover, the data obtained during the severe sand production event, which terminated the operation forcibly, could derive insights about the process and causes of the phenomenon.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2016
- Bibcode:
- 2016AGUFM.B21G0500Y
- Keywords:
-
- 0468 Natural hazards;
- BIOGEOSCIENCESDE: 0486 Soils/pedology;
- BIOGEOSCIENCESDE: 3004 Gas and hydrate systems;
- MARINE GEOLOGY AND GEOPHYSICSDE: 4316 Physical modeling;
- NATURAL HAZARDS