日本地熱学会誌

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In the steam pipes at the outlet side of the evaporator of the binary power generation system using dry steam from Moto Hakone No. 38 well, the microstructures of the pipe with scaling and powdered scale from sampling the pipe were analyzed. The main component of adhered scale was soluble sulfur. No corrosion occurred on the stainless steel surface, and soluble sulfur adhered directly to the stainless steel surface. Therefore, soluble sulfur should be considered as a countermeasure against scale formation at binary power plants using steam. In addition, the saturation index (SI) of the soluble sulfur was calculated under the assumed operating conditions. As temperature decreases, SI of the soluble sulfur increased. In evaluating the effect of the H₂S/SO₂ ratio during condensation, it is recognized that it is difficult to completely prevent sulfur scaling because sulfur may precipitate when only a small amount of SO₂ is present in the geothermal steam. In the future, understanding the amount of sulfur scale formation under various conditions will lead to optimal system design.

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一般的な圧力・温度検層の既存データ（坑井仕様と流量を含む）を利用した，コスト効率が良い坑井内摩擦圧力損失の調査手法を提案する。本手法では、圧力測定値を坑口圧力・慣性力・摩擦力・重力の各成分に分解して抽出した，摩擦圧力損失のプロファイルを作成する。現実の生産井と試験井に適用した結果，スケール付着，ケーシング径の変化，設置されたマルチステージ・セメンチング用のツールとの対応を示唆するアノマリーと，その時間的変化を見出すことに成功した。更に増角区間終点付近での摩擦圧力損失の増加から，堆積物の存在が推測された。

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