... to extract gas from offshore NGH reservoirs. sediment target zone ngh sediment gao horizontal section horizontal well axial force hookload mud flow rate friction factor directional drilling upstream oil & gas pressure drop calculation drilling operation gas hydrate reservoir...

... biological productivity (Wang, 1999; Wang and Gao, 1999). Internal waves on the continental shelf have been extensively studied, and an overview has recently been given on remote sensing and in situ observations of internal tides, solitary waves and bores in shallow water by Wang and Gao (2000a...