Title:

Transient Analysis of the 1991 Hijiori Shallow Reservoir Circulation Test

Authors:

M. Hyodo, N. Shinohara, S. Takasugi, C. A. Wright, R. A. Conant

Geo Location:

Hijiori, Japan

Conference:

Stanford Geothermal Workshop

Year:

1996

Session:

Well Test /Drilling

Language:

English

File Size:

555KB

View File:

Abstract:

Like any dynamic system, HDR reservoirs cannot be fully characterized by their steady-state behavior. Circulation tests analysis should be performed on both the steady-state response and the transient response of HDR systems. Transient analysis allows not only estimation of critical reservoir parameters and how lthese parameters change with operating conditions I history, but transient analysis also aids in evaluating the feasibility of various modes of HDR system operation (base load, load following, etc.). This paper details the transient analysis of NEDO's FY 1991 Shallow Reservoir Circulation Test at the Hijiori HDR site in Japan. Reservoir fluid storage is carefully bounded through the employment of two distinct methods for calculation of the fluid storage from the observed transient response. A brief discussion is also included of the distribution of' reservoir fluid storage; the relationship between pressure, reservoir stress, and apparent reservoir capacitance; and appropriate circulation test design to facilitate transient analysis.


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