Abstract
In phase 1 of the Japan's Methane Hydrate Exploitation Program, the method to decrease the hydro static pressure by use of a submersible pump (the depressurization method) was recognized to be essential for the production technique. In phase 2, the basic design for the down hole production test system for offshore production tests was implemented by combining the technologies for DST (drill stem test) that are usually used in conventional oil and gas offshore production test operations. In respect of the surface production test system, the basic plan related to the necessary production facilities was designed and the specification of the floating drilling vessel suitable for the necessary facilities was also investigated. Regarding the produced water treatment system, framing of the conceptual design, organizing the regulations related to discharge, and examination of the environmental assessment have been investigated.
