鐵砧山注產氣井完井區間之訂定及其對地下儲氣工程設計影響之研究

Optimum Completion Interval Approach in TCS l/P Wells and Its Effect on Underground Gas Storage

黃瑞鴻(Raey-Hong Huang) ； 陳大麟(Ta-Lin Chen) ； 李中和(Chung-Ho Lee) ； 吳柏裕(Po-Yu Wu) ； 吳偉智(Wei-Jr Wu) ； 范來富(Lai-Fuh Fan) ； 蔡鏗榮(Keng-Rown Tsai) ； 王勝雄(Sheng-Hsiung Wang) ； 吳健一(Chien-I Wu)

《鑛冶：中國鑛冶工程學會會刊》 44卷1期 (2000/03) Pp. 46-53

https://doi.org/10.30069/MM.200003_44(1).0004

摘要

中油公司選定鐵砧山氣田做為調節市場用氣之地下儲氣窖，不但具有較大之注產氣及儲氣能力，同時也較地面相同容量之儲槽造價便宜且更具安全性。但鐵砧山氣田為一水驅型氣田，若生產井之底部有底水層，當產率超過水錐臨界產率時即有可能造成水錐出水之現象。因此本研究結合氣水界面位置之預測、水錐現象之模擬計算及各種不同完井區間之注產氣能力節點分析等三種研究結果，建議將A井坪之三口注產氣井之原設計完井區間提高五公尺，不但同時兼顧足夠之注產氣能力及防止水錐現象，並可節省約六億立方公尺之墊底氣。研究結果經現場採用實際施工後，六口新鑽注產氣井之注產氣能力經測試證實均能達到原設計之要求，也使我國地下儲氣工程之設計技術迎頭趕上國際水準。

關鍵字

完井區間 ； 水錐 ； 節點分析 ； 地下儲氣工程 ； 墊底氣

並列摘要

CPC has selected the TCS field to be an underground gas storage serving the accommodation of the huge discrepancy between the peak and off-peak hour usage. It not only provides a greater injection/production and storage capacity, but also is much less expensive and safer than a surface storage tank with the same capacity. TCS field is a water-driven gas reservoir. Generally speaking, if there exists an aquifer overlain by the well, water coning is a consequence when a well's production rate exceeds the critical rate. This study combines several sub-projects including prediction of the gas/water contact position, calculation of the water coning phenomena and nodal analysis for different completion interval, with which the water coning can be prevented. The results of the three above mentioned sub-projects concluded that if an alteration is made to the original design on the completion interval by shortening 5 m upwards for all three I/P wells in the ＂A＂ block, it should be able to provide enough I/P capacity as well as prevent water coning. More importantly, it will reduce the requirement of cushion gas by some 600 MMSCM. This suggestion was accepted and the production tests showed that all six new I/P wells meet the demand of the original design. The success of this new approach leads the underground gas storage technique of Taiwan to catch up with an international level.

並列關鍵字

Completion Interval ； Water Conning ； Nodal Analysis ； Underground Gas Storage ； Cushion Gas