不同注入氣於注氣循環時其置換效率之比較

Comparison of Displacement Efficiency of Various Gases in the Process of Gas Cycling

翁豐源(Feng-Yen Oung) ； 吳健一(Chien-I Wu) ； 王順記(Shuhn-Jih Wang)

《鑛冶：中國鑛冶工程學會會刊》 28卷1期 (1984/03) Pp. 123-133

https://doi.org/10.30069/MM.198403_28(1).0009

摘要

注氣循環為凝結油氣田提高逆變凝結油採收之傳統方法，而注入氣的選擇對凝結油之囘收率，注入壓力之設定及各種生產系統之設計等均有密切關係。注氣循環之囘收率為置換效率、面積排掃效率及垂直排掃效率三項之乘積，而置換效率係由注入氣對凝結油之再揮發率及其對油氣層流體之多度接觸混溶效應而定。本研究以PVT相態分析儀針對某氣田如施行注氣循環時，試驗及分析三種最可能之注入氣，包括銷售天然氣、低熱值天然氣及二氧化碳，其置換效率之比較。經研討結果顯示，二氧化碳之置換效率最高；若純以凝結油囘收率之觀點而言，二氧化碳乃為最佳之注入氣。

並列摘要

Gas cycling is the conventional method to enhance the recovery of retrograde condensation in a condensate reservoir. The selection of injection gas will greatly affect the condensate recovery, the determinaion of injecting pressure, and the design of production facilities. The recovery factor of gas cycling depends on the product of displacement, areal sweep, and vertical sweep efficiencies, and the displacement efficiency is relative to the revaporization of condensate with respect to the gas injected and the multiple-contact-miscibility effect of the reservoir fluid with the injection gas. In this paper, the phase behaviors of the reseroir fluid under the influence of sales gas, low heating value gas, and carbon dioxide respectively were studied with the PVT instrument and the displacement efficiencies of each injection gas were compared. The conclusion of this study is that carbon dioxide has the best displacement efficency with low heating value gas being the second.