傳統評估天然氣井產能之方法為進行產能分析試驗，試驗進行時至少需以四種不同產率開井生產，藉由觀察天然氣井於穩定流動狀態或近穩定流動狀態之壓力表現，用以估算天然氣井之產能。此種試驗方法受地層滲透率影響，須耗時數小時甚至達數日之久，將消耗大量試驗執行成本，且進行數據分析時亦受人為作圖誤差影響，計算分析之結果誤差較大。
本研究應用臺灣天然氣井實際地質及工程現地數據，建立天然氣井產能特性資料庫，並歸納出無因次IPR曲線（Dimensionless IPR Curve）。提供一種簡易且迅速之天然氣井產能試驗分析方法。藉由此法可於短時間內評估天然氣井之井口全開噴流能力(Absolute open flow Potential，AOFP)與單日產能，大幅縮減天然氣井產能試驗進行時間，避免試驗進行時所耗費之大量天然氣、巨額設備維護費及人力成本。
本研究以國內16口天然氣井之試驗數據進行傳統繪圖法及無因次IPR曲線計算法進行井口全開噴流能力計算，兩者差異分布為1.78%至23.58%之間，平均差異為10.41%。顯示以無因次IPR曲線計算法可有效輔助進行全開噴流能力估算，降低評估誤差。

This study presents a time-saving method for deliverability calculations of gas wells, which among other advantages, eliminates the need for conventional multipoint tests. The analytical solution to the diffusivity equation for real gas flow under stabilized or pseudo-steadystate flow conditions and a wide range of rock and fluid properties are used to generate a correlation for calculating gas well deliverability. The rock, fluid and system properties, used in developing previous correlations are from the wells of gas fields in Taiwan.
The modified relations developed in this study provide a simple procedure for gas deliverability calculations which greatly save the acquired time of the conventional deliverability testing methods. The required data can be obtained from a build-up test, or a single-point flow test, instead of a multipoint flow test. Further, the broad range of practically all rock and fluid properties used in developing the modified dimensionless IPR curves should cover the majority field conditions in Taiwan.
A comparison of calculation results from dimensionless IPR curve with the one from traditional methods had been performed. The difference of AOFP between conventional plot method and dimensionless IPR curve of 16 gas wells ranged form 1.78% to 23.58%. The average error is around 10.41%.

Al-Attar, H., Al-Zuhair, S., A General Approach for Deliverability Calculations of Gas Wells. Paper SPE 111380, 2008.
Ambastha, A.K., Kosarussawadee, P. A Comprehensive Study of Dimensionless IPR Correlations For Gas Wells, Paper CIM/AOSTRA Technical Conference, 83-91, 1991
Beggs, H., Gas Production Operation, OGCI Publication, 1985.
Billiter, T., Lee, J., A Permeability Dimension less Inflow Performance Relationship Curve for Unfarctured Gas Wells. Paper SPE/CERI 59759, 2000.
Chase, R. W., Williams, M., Dimensionless IPR Curves for Predicting the Performance of Fractured Gas Wells. Paper SPE 15963, 1986
Chase, R. W., Dimensionless IPR Curves for Predicting Gas Well Performance. Paper SPE 17602, 1987.
Chase, R. W., Anthony, T.H., A Simplified Method for Determining Gas-Well Deliverability, Paper SPE 14507, 1988.
Chase, R. W., Alkandari, H., Prediction of Gas Well Deliverability From Just a Pressure Buildup or Drawdown Test. Paper SPE 26915, 1993.
Chase, R. W. et al. Comparison of Dimensionless Inflow Performance Relationship for Gas Wells. Paper SPE 75719, 2002.
Cullender, M.H., The Isochronal Performance Method of Determining Flow Characteristics of Gas Wells, Trans, AIME 204, 137-145, 1955.
Gas Well Testing. Theory and Practice. Energy Resources Conservation Board, Alberta, Canada, 1979.
Katz, D.L., Cornell, D., Flow of Natural Gas form Reservoirs. University of Michigan Publishing Services. 1955.
Katz, D.L. et al. Handbook of Natural Gas Engineering, McGraw Hill Book Co., Inv, 1959.
Lee, A.L., et al. The Viscosity of Natural Gasses. Trans, AIME 237, 997-1000, 1966.
Lee, J., Well Testing, SPE of AIME, 1982.
Meng, H. Z. et al, Production Systems Analysis of Vertically Fractured Wells. Paper SPE/DOE 10842, 1982.
Mishra, S., Caudle, B. H., A Simple Procedure for Gas Deliverability Calculations Using Dimensionless IPR Curve. Paper SPE 13231, 1984.
Rawlins, E.K., Schelhardt, M.A., Back-Pressure Data on Nature Gas Wells and their Application to Production Practice, Monograph 7 , USBM, 1936.
Smith, H. J., One Day Gas Well Testing. World Oil, May 2000, 43-48, 2000.
Swift, G.W., Kiel, O.G. The Prediction of Gas Well Performance Including the Effect of Non-Darcy Flow. Trans, AIME 225, 791-798, 1962.
Vogel, J. L. et al, Inflow Performance Relationship for Solution-Gas Drive Wells. J. Pet. Tech., pp. 83-92, 1968.
Winestock, A. G., Colpitts, G. P., Advances in Estimating Gas Well Deliverability. 16th SPE of C.I.M. Annual Tech., Calgary, Canada, 1965.
探採叢書－油層工程概論, 台灣油礦探勘處及中國石油學會, 1972.
探採叢書－油氣井測試, 台灣油礦探勘處及中國石油學會, 1973.
中國石油公司訓練教材叢書－石油探採, 中國石油公司訓練所, 2003