One of the key issues in gas production from methane hydrate-bearing reservoir is the excessive water production from adjacent aquifers and other sources. As a countermeasure, it is necessary to reduce the permeability of the surrounding aquifers to a distant extent. As a process of making this countermeasure possible, we are exploring the possibility of applying waterglass-based water blocking agent generally used in the construction industry. This paper presents the results of the experiment and numerical simulations and the direction of future studies.
