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- W2609355761 abstract "Abstract A heat transfer model in NGH sediments during drilling fluid deep-circulation and a dynamics model of NGH decomposition, in which the temperature-difference driving process is mainly considered, are established to evaluate NGH dissociation and gas and water production during deep-sediment penetration. A local overpressure generation model from NGH dissociation is constructed to calculate the induced overpressure and shallow gas (SG) and shallow water flow (SWF) formation under various conditions. Investigated are the effects of drilling fluid circulating temperature and NGH saturation on NGH dissociation and overpressure (SG and SWF) formation processes. The results indicate that the heat conduction from circulating drilling mud to NGH formation is so slow that local overpressure will only be developed within about 1.5m around the wellbore for 9 days of drilling fluids deep-circulation under typical operation conditions. For the typical NGH bearing sediment, an overpressure as high as 2.4MPa will be induced within the formation about 1.5m around the wellbore after about 9 days of drilling fluid deep-sediment circulation. This will exert great threat on the safety of cement sheaths and NGH sediment caps. During deep-sediment penetration and drilling mud circulation, the NGH saturation has more significant effects on NGH decomposition and local overpressure development than mud circulating temperature. 100% increase of drilling mud circulating temperature will result in only 10% increment of the local overpressure around the wellbore, while 100% increase of NGH saturation will result in 130% augment of in-situ overpressure." @default.
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- W2609355761 date "2017-05-01" @default.
- W2609355761 modified "2023-10-16" @default.
- W2609355761 title "Shallow Gas and Shallow Water Flow Induced by Natural Gas Hydrate Dissociation in Deep Water Sediments" @default.
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- W2609355761 doi "https://doi.org/10.4043/27624-ms" @default.
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