...), Therefore, the surveys of characteristics of benthic communities, water quality and sediment affected by the seabed mining were conducted by Hakurei Maru No.2. 62 Proceedings of the Twenty-fifth (2015) International Ocean and Polar Engineering Conference Kona, Big Island, Hawaii, USA, June 21-26, 2015...

... in Pacific Ferromanganese crusts probably can be regarded as a signal of paleoproductivity pulses. crust barite metals & mining upstream oil & gas ar babio sediment accumulation rate fe-mn crust paleoproductivity pulse paleoceanography pacific ferromanganese crust variation babio...

...Depressurization and Electrical Heating of Hydrate Sediment for Gas Production Hideki Minagawa, Takuma Ito, Sho Kimura, Hiroaki Kaneko, Shohei Noda and Hideo Narita Methane Hydrate Research Center, National Institute of Advanced Industrial Science and Technology (AIST) Sapporo, Japan ABSTRACT...

... reports the results of numerical simulation of partial oxidation method as a method of enhanced recovery for gas hydrates. The fundamental data was obtained by a series of experiment of partial oxidation in a vessel simulated as a situation of marine sediments. gas hydrate bearing sediment hydrate...

...Frictional Strength between Well and Sediment under Confining Pressure for Methane Hydrate Production Well Integrity Masayo Kakumoto*, Jun Yoneda*, Jun Katagiri*, Kuniyuki Miyazaki Norio Tenma* and Kazuo Aoki* * Methane Hydrate Research Center, National Institute of Advanced Industrial Science...

... Experimental Investigation on Controlling the Depressurization-Induced Production Behavior from Hydrate-Bearing Sediments in 10-Meter-Scale Taewoong Ahn a, Jaehyoung Lee a, Joo Yong Lee a, and Se Joon Kim a a Petroleum and Marine Resources Division, Korea Institute of Geoscience and Mineral...

... have been designed. WEPC samples in seabed sediments and non-diagenetic formations, WRPC samples in medium-hard formations and DRPC works with conventional drill pipe. The working principle and main parameters of three samplers as well as the functions and features of the key components in the sampler...

... are experimentally explored in this study using both synthetic and natural gas hydrate-bearing sediments. The parametric study on the behavior revealed that the magnitude of subsidence during production mostly scales with the compression index of sediments and gas hydrate saturation. gh-bearing sediment lab...

... of gas hydrates is seen as a two-step process of (1) a fast interfacial reaction (2) followed by much slower diffusion-limited transport. particle neutron diffraction molecule clathrate hydrate transformation upstream oil & gas kuh natural gas hydrate flow assurance sediment ch 4...

... ABSTRACT Suspension principle of deep-sea miner is proposed to make sure that the miner can walk on the soft sediments of seafloor effectively. The supporting mechanism and the driving mechanism are separated to avoid sinking. The supporting mechanism is a streamlined baseboard with large...

... ABSTRACT Abnormal methane population in natural gas hydrates (NGHs) recovered from natural deep sea sediment has been demonstrated. Highly increased CH 4 occupancy ratios of large to small cages were observed in the sediment rich component of NGH, indicating that various minerals and mobile...

... ABSTRACT Thermal conduction and phase transformation are physical-chemical processes during the dissociation of gas hydrate-bearing sediments. Heat transfer leads to the expansion of hydrate dissociation front and the weakening of soils accompanied by the seepage of fluids and the deformation...

... ABSTRACT Deep seabed sediments have been classified in various ways: either by the size of particles, the description of components, the process of formation, or some combination of these three. The simplest means for describing sediment is by the size distribution of its particles...

... upstream oil & gas flow assurance reservoir characterization hydrate-bearing sediment fluid dynamics ring shear experiment permeability measurement system sediment normal stress ring shear apparatus dissociation methane hydrate shear zone specimen flow in porous media...

..., the seafloor that would be directly impacted per mining operations was sized and optimized; both the amount of mobilized sediment and the value of benthic biomass intercepted by the nodule collector were estimated. Nevertheless, in order to minimize the adverse effect on the benthic community, some technical...

... ABSTRACT Although not yet commercially practiced, deep-sea mining is under development for metalliferous sediments, massive sulphides and polymetallic nodules. Ore extraction is to be achieved by sediment suction, rock cutting and nodule collection, and transport from the seafloor...

... hydraulic conductivity dense packing specimen packing specimen reservoir characterization loose packing specimen sediment flow in porous media apparatus permeability test fluid dynamics specimen normal stress shear stress displacement Basic Study on the Permeability of Sand during Direct...

... characterization, because of the difficulty measuring it. Whereas conventional oil and gas reservoirs involve solid rocks, the layers containing concentrated gas hydrate consist of unconsolidated sediments, which are easily deformed during measurements. The pore-size distribution of Nankai Trough unconsolidated...

... ABSTRACT: The development of the stresses and displacements in the seabed caused by the dissociation of gas hydrate were numerically simulated by using the software ABAQUS. The effects of the dissociation size and the sustaining strength of the gas hydrate sediment after dissociation...

...), Denki-Bldg. Chuo-ku, Fukuoka, Japan ABSTRACT Methane Hydrate (MH) is considered to be one of the new-generation energy resources. For the development of production method to extract the methane gas from MH sediment, it is important to estimate the sediment deformation. In order to understand the geo...