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- W2023656589 abstract "ABSTRACT Natural gas hydrates exist in the North Slope of Alaska, the Northwest Territory of Canada, the U.S.S.R. and offshore waters deeper than 5,000 ft. Actual hydrate cores have been obtained from the Gulf of Mexico and the western coast of Guatemala. In addition, ARC0/EXX0N have recovered a gas hydrate core sample at a depth of 666 m in 1972 from N-W-Eileen Number 2 well in Prudhoe Bay, Alaska. Drilling through hydrate deposits causes mud gassification and an increase in the drilling rate. Chilled drilling fluid with higher mud weight at high circulation rates are routinely used to avoid any possible problems due to severe gassification. This study involves a development of a thermal simulator to determine the position of the hydrate dissociation front and gas influx rate as a function of drilling conditions. The solution of this problem involves the tracking of a moving boundary between thawed and unthawed hydrate regions. This is a r-z simulator for unsteady state heat conduction in the presence of a moving boundary. The heat losses to overburden as well as underburden are accounted for in the formulation of the model. A finite difference numerical scheme is used to generate temperature profiles in thawed and unthawed zones, and the hydrate dissociation rate during drilling. Results are presented in graphical form for reservoirs with a range of porosity, geothermal gradients, mean annual surface temperatures, and pressures relevant for in-situ hydrate deposits in the arctic. Furthermore, these results provide quick guidelines for the selection of drilling variables, such as mud temperature, mud weight and circulation rate." @default.
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- W2023656589 date "1987-04-08" @default.
- W2023656589 modified "2023-09-24" @default.
- W2023656589 title "Thermal Model for Establishing Guidelines for Drilling in the Arctic in the Presence of Hydrates" @default.
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- W2023656589 doi "https://doi.org/10.2118/16361-ms" @default.
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