an integrated steady-state - International Geothermal Association

EX1 Actual size output curve:
size out ut curve:
+ Largest size curve:
o - Feed zone moas flowrate pressure
Figure 1: Comparison of the representative well's drawdown relationship against output curves for various
geometry configurations (Graph from WELLSIM Version 1.0)
This study demonstrates thepotential use of thepackage
to highli hting where an additional increase in wellbore
only a marginal effect on the production. As
noted above, the featuresfor such a representative
well study is to look at the relativeproduction increases rather
than the magnitudes. Although only two sets of geometry
configurations have been considered in this example, the
number of alternatives that the package can examine is not
CONCLUSION
A new computer package has been developed, designed to
incorporate a steady-state simulator with various analysis
tools to aid the user in assessing the simulators rformance
and assessing the consistency of any entered
into the program. Three major application areas for the
package have been identified terms existin
systems, changes to existing systems,
modelling or systems. The facility
of ou ut curve has been illustrated for
an application o the latter type, and the has been
shown be a powerfulaid for scenarios
parameters.
ACKNOWLEDGEMENTS
The behind the develo ment of the simulation and
anal sis modules discussed in aper has been supported
by from the New Zealand foundation for Research,
Science and Technology. Grateful thanks are extended to
Energy New Zealand Limited for the permission
to publish this paper.
REFERENCES
Barnett, B. (1989). A theoretical stud of the effect of bore
diameter on well outputs. Proc. th Workshop,
Auckland University,pp. 181-187.
Bjornsson, G. and Bodvarsson, G.(1987). A multi-feedzone
wellbore simulator. Geothermal Resources Council Trans.,
11, 503-507.
GENZL, and Auckland University (1991). WELLSIM
TutorialManual.
C. and Freeston, D. (1991). of
geothermal inflow performance and
relationshipsto wellbore
Resources Council Trans.,
ut curve prediction. Geothermal
01. 15, (in press).
Gunn, C. and Freeston, D. (in pre The a plicability of
two standard for the of on
geothermal fluid properties.
C., Freeston, D. and Had T. submitted).
Principles for wellbore simulator
calibration
using matching analysis. Submitted to
Haas Jr. J. 1970). An equation €or the of vaporsaturated
Na& solutions from 75°C to 325 C. Am.Jnl.
of Vol.
Haas Jr., J. (1976). Physical properties of the coexisting
phases and
of the H20 component
of boiling NaCl solutions. U.S.Geological Survey Bull.,
1421-A.
,T. and Freeston,D. (1986). Application of wellbore
to management problems for a eothermal field
case studies. Proc. 9th Australasian Mechanics
Auckland University,
Had T. and Freeston, D. 1990). A multi- urpose
simulator. Geothermal Trans., 14,
1279-1286.
Kanyua, J. (1985). The Vertical Flow
Liquid Separator and its A plication to the Gases
from Geothermal
thesis, University of
Auckland.
Pritchett, J., Rice, M.
Statefor Water-CarbonDioxide
Baca Reservoir. Report for
of New Mexico and
Mexico.
Sutton, F. (1976). Pressure-temperature curves for a
hase mixture of water and carbon dioxide. Jnl. of
19,297-301.