EROI For The Production Of Methane From
Hydrates By Hot Water Injection
Author(s)
R. C. Callarotti
Abstract
We model the heating of submarine methane hydrate deposits located at depths
between 1000 and 1500 meters, when the heating is supplied by hot water
flowing through a horizontal pipe located inside the reservoir. The hot water is
supplied as heat exchanger output of a combined cycle power plant and then
pumped at a given velocity into the horizontal pipe. By means of the enthalpy
method we determine the time dependent heating of the hydrates and the amount
of their melted volume. The partial energy efficiency of this process (EROI) is
determined as the ratio of the equivalent energy of the gas produced to the
kinetic energy required for the flow of the water at a given speed through the
heating pipe. This efficiency is found to vary from a value of 20 at the beginning
of the heating to a value of 2.8 after 50 years of operation. The EROI is found to
be to be independent of the length of the horizontal well.
Keywords: EROI, methane hydrate production, convective heat transfer, moving
boundary problems, enthalpy method.
1 Introduction
Methane hydrates are water-methane compounds which are present under the
proper temperature and pressure conditions either at the bottom of the sea close
to continental shelves or in the subsoil (Sloan [1] and Carroll [2]). They are
important due to the very large amounts of methane they contain (Demirbas [3]).
By 1999 Japan had already started very significant efforts to produce gas from
land and oceanic deposits, and recent research has been directed to the
production of methane hydrates via heated horizontal wells (Yamakawa et al.
[4]). Hot water from the heat exchangers of a floating power plant is injected into
the horizontal pipe inserted through the reservoir.
Keywords
EROI, methane hydrate production, convective heat transfer, moving
boundary problems, enthalpy method.
Related Book
Other papers in this volume
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