Abstract
From November 27, 2000, a two-year circulation test (Long-term circulation test; Exp. 0002) was started with HDR-1 as an injection well, and HDR-2a and HDR-3 as production wells at the Hijiori HDR site in Yamagata prefecture, Japan. The purpose of test was estimation of the long-term production characteristics of the Hijiori HDR reservoir and to provide data to calibrate the numerical model of the system. Aiming to evaluate the characteristics of the Hijiori multi-reservoir system, we continue to measure the some data (Pressure, Temperature, flow rate) in the wellhead and monitoring the pressure data of the shallow reservoir. Using the Bed-of-Nails model at several fractures of the Hijiori multi-reservoir system and the results of measured data of Exp. 0002, we developed a numerical model using FEHM (Finite Element Heat and Mass Transfer) code.
The results obtained from this simulation are as follows.1) Variation of the downhole pressure of SKG-2 was expressed using this numerical model.2) We success to apply the Bed-of-Nails model at several fractures.3) Ratios of productivity from the shallow reservoir of both wells are different, with well of HDR-3 producing more from the shallow reservoir that well HDR-2a.
