Journal
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
Volume 62, Issue -, Pages 113-131Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jngse.2018.11.027
Keywords
Oceanic methane hydrate; Nankai Trough; Horizontal well; Depressurization; Hot water injection
Categories
Funding
- National Natural Science Foundation of China [51776030, 51436003]
- PetroChina Innovation Foundation [2017D-5007-0210]
- Fundamental Research Funds for the Central Universities [DUT18ZD207]
- Open Fund of Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education at Dalian University of Technology
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Due to the complicated reservoir conditions in the oceanic methane hydrate (MH) reservoir in the Nankai Trough, Japan, the gas production rate for the economical extraction had not been achieved during the current field production tests in 2013 and 2017 using vertical wells. Therefore, this study aimed at the application of the horizontal wells to the oceanic MH production in the Nankai Trough. Since there existed three sub-hydratebearing layers with different physical properties (i.e., initial hydrate saturation, porosity, and intrinsic permeability) in the reservoir, some possible well configurations including single horizontal well patterns and dual horizontal well patterns were designed based on a multilayered geological model simulating the real oceanic MH reservoir in the Nankai Trough. Then, the effectiveness of these two kinds of well designs was verified via long-term simulations of the oceanic MH production by simple depressurization, and the optimal well configuration for each design was recommended. Furthermore, a combined method of depressurization and hot water injection was also tested based on the dual horizontal well pattern, and the sensitivity analyses indicated that a favorable gas production rate of 8.64 x 10(5) m(3)/day could be obtained within the first year, even under a relatively low injection temperature of 40 degrees C and a relatively small injection rate of 2 kg/s/m of well.
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