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臺灣能源期刊論文全文

臺灣能源期刊第8卷第2期內容

出刊日期:June, 2021

題目
地熱井抽注影響範圍研究:以臺灣清水地熱礦區為例
Title
Study on the Influence Area of Geothermal Injection/ Production Wells: Case Study of Cingshui Geothermal Field
作者
謝秉志、曾紹宇、魏柏丞、李伯亨、劉力維、蔣立為、韓吟龍
Authors
Bieng-Zih Hsieh, Shao-Yu Zeng, Bo-Cheng Wei, Bo-Heng Lee, Li-Wei Liu, Li-Wei Chiang, Yin-Lung Han
摘要
本研究的主要目的是利用數值模擬法,在所建立的地熱礦區儲集層模型上,進行參數與情境模 擬分析,以評估地熱案場的抽注影響範圍特性。本研究以地熱礦區的現場地質及工程資料為基礎, 利用儲集層模擬軟體建立數值模型,先進行長時間模擬以得礦區的自然狀態,再進行地熱操作井的 生產工程設計而完成數值模擬模式。本研究設計不同的參數與情境模擬分析,了解不同案例與情境 對礦區之影響。以清水地熱礦區為案例,本研究發現無回注井設置情境之壓力影響範圍最大,壓力 影響半徑約為300公尺。而由不同回注情境可知,生產井與回注井距離越近,對於壓力維持效果越 佳,但是兩井太過接近或是回注水溫過低將會造成冷鋒突破,對於生產井之產能造成影響。在回注 水溫度為攝氏60度、回注率為生產率70%的條件下,回注井與生產井距離達到250公尺時,尾水回 注對生產井的水溫影響最小。對於礦區的長時間開發效益來說,建議回注井與生產井之距離大於 250公尺。
關鍵字
地熱井抽注,數值模擬,地熱儲集層開發
Abatract
The purpose of this study is to use the numerical simulation method to conduct parameters analysis and scenario simulation on the established geothermal reservoir model to evaluate the characteristics of the influence area of the geothermal injection/production wells. Based on the on-site geological and engineering data of the geothermal field, we build a 3-D reservoir model and first perform a long-term simulation to obtain the natural state of the geothermal field. Then, the production engineering of the geothermal operation well is designed to complete the numerical simulation model. This study designs the analysis of parameters and scenarios to understand the impacts of different parameters and scenarios on the geothermal reservoir. Based on the case study of Cingshui geothermal field, we found that the scenario of non-reinjection has the largest pressure influence area with a pressure influence radius of about 300 meters. Our different reinjection scenarios showed that the closer the production and the reinjection wells, the better the reservoir pressure maintenance; however, if the two wells are too close or the temperature of the reinjection water is too low, the cold-water front will breakthrough, which will affect the productivity of the production well. Under the condition that the reinjection water temperature is 60 degrees Celsius and the reinjection rate is 70% of the production rate, the reinjection has the least impact on the temperature of the production well when the distance between the reinjection and the production wells reaches 250 meters. For the long-term development benefits of this studied field, the distance between the reinjection and the production wells greater than 250 meters is recommended.
Keywords
production/injection of geothermal wells, numerical simulation, geothermal reservoir development