کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8127404 | 1522833 | 2013 | 31 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Feasibility of gas production from a gas hydrate accumulation at the UBGH2-6 site of the Ulleung basin in the Korean East Sea
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
زمین شناسی اقتصادی
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چکیده انگلیسی
We investigate the feasibility of production from a marine hydrate accumulation that has the properties and conditions of the UBGH2-6 site at the Ulleung basin in the Korean East Sea. The 20Â m-thick system is in deep water (2160Â m) but close to the ocean floor (with its top at 140Â mbsf), and is characterized by alternating mud (near hydrate-free) and sand (hydrate-rich) layers. The layered stratigraphy and the presence of mud layers preclude the use of horizontal wells and necessitate vertical wells. The analysis indicates that production from such a hydrate accumulation is feasible, but the production rates are generally modest. The production rate Qp peaks at about 1.45Â STÂ m3/s=4.4 MMSCFD at about t=1 year, and continuously declines afterward. Sensitivity analysis indicates that cumulative production increases with a declining initial hydrate saturation, an increasing intrinsic permeability of the sand layers and an increasing thermal conductivity of the porous media, while the effect of porosity is non-monotonic: production initially increases with a decreasing porosity, but the trend is later reversed. However, the sensitivity to these parameters is limited, and does not alter the overall predictions of modest production potential. The geomechanical situation appears challenging, as significant subsidence (exceeding 3.5Â m at a depth of 20Â m below the sea floor, and 1.5Â m at the top of the hydrate deposit) is estimated to occur along a large part of the wellbore, and yielding and failure within the 20Â m-thick system are possible early in the production process. However, there is significant uncertainty in the predictions of the geomechanical system behavior because they are not based on measured system properties but only on estimates/assumptions from analogs.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Petroleum Science and Engineering - Volume 108, August 2013, Pages 180-210
Journal: Journal of Petroleum Science and Engineering - Volume 108, August 2013, Pages 180-210
نویسندگان
George J. Moridis, Jihoon Kim, Matthew T. Reagan, Se-Joon Kim,