Modeling Study of the Mutnovsky Geothermal Field (DACHNY) in Connection with the Problem of Steam Supply for 50 MWe PP

Abstract

The Mutnovsky geothermal field modeling study
(TOUGH2) previously made by the author
(Kiryukhin, 1992, 1996, 2002) has shown that total
steam production of the wells existing in 1991 will
yield not less than 44 MWe. In October 2002
Mutnovsky 50 MWe PP was put into operation in
Dachny site. The problem of steam supply to
Mutnovsky 50 MWe PP (Dachny) trigged the new
reservoir model demand. Due to above, the old model
(1992, 1996, 2002) has been revised and the new one
based on ìwell-by-wellî generated mesh (A-Mesh
grid generator) strongly related to the particular wells
and production zones has been used (the so-called
Main production zone in Dachny site strikes north-north-
east and dip east-east-south at the angle 60 Ó
(Kiryukhin et al.,1998)). The following data are used
for the new model calibration: (1) flowtests from
wells ? 4, 016, 26, 029W and 24 (the data of 1999-
2002), (2) additional wells ¿ 1 ñ ¿ 4 drilling data, (3)
pressure monitoring data (well 012) and (4)
exploitation wells ? 4, 016, 26, 029W, A2, E5 (2002-
2003 year) output data. Modeling results show that
total steam production of the wells (? 4, 016, 26,
029W, E5) will decline from 60-70 kg/s to 30 kg/s
during the period of 10 year exploitation due to
overload of the north part of the Main production
zone. Modeling of additional exploitation load in the
south-eastern part of the Dachny site to maintain 50
MWe PP is on-going..