Application of Lumped Parameter Model for Evaluating Pressure Interference Influences in Geothermal Reservoir Management

概要

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Three production wells of H-17, H-28, and H-29 discharged fluids from the reservoir formed along the Hatchobarufault. Pressure interferences among these wells were recognized by the change of discharge rate and geochemical monitoring data. The productivity of H-28 located between H-17 and H-29 declined due to the interferences, and the supply of steam to the power plant was often discontinued. Therefore a lumped parameter reservoir model for estimating hydraulic characteristics of reservoir and interferences from other production wells was developed and applied for analyzing Cl concentration and silica temperature monitored both in H-28 and 11-29.<BR>Analysis results indicated that discharges of wells H-17 and H-29 affected that of H-28. Pressure interference among wells H-17 and H-28 with H-29 was negligible small. Moreover it is presumed that an abrupt change of reservoir pressure is apt to occur in H-28 because the reservoir volume related to H-28 is about half in magnitude that of H-29. Accordingly the pressure interference of H-17 and H-29 resulted in appreciable pressure drop in H-28 reservoir. Thus analysis using the developed lumped parameter model can be used for quantitative evaluation of pressure interference influences in geothermal reservoir management.
日本地熱学会の論文