Reinjection Experiences in the Otake and Hatchobaru Geothermal Fields, Japan

Abstract

This paper presents the recent exploiting state, the developing measures against experienced reinjection problems and geothermal model involved in the underground structure and hot water flow in the Otake-Hatchobaru fieIds. The following two problems on reinjection are not disregarded to operate geothermal power plants. (1) Interference of reinjection with production well (2) Reduction in reinjection capacity of well.

In this paper, the problems are presented and discussed on the basis of the field data in the Otake-Hatchobaru fields. Reinjection methods have been devised for preventing reservoir from cooling. study on silica scale and hydraulic fracturing test have been conducted for the purpose of recovering reinjection capacity or prolonging lifetime of reinjection well. t i o n , the reinjection problans have been able to be solved to some extent, compared with those at the initial stage of reinjection experience.