Selection of decline curve analysis method using the cumulative production incline rate for transient production data obtained from a multi-stage hydraulic fractured horizontal well in unconventional gas fields
by Dongkwon Han; Sunil Kwon
International Journal of Oil, Gas and Coal Technology (IJOGCT), Vol. 18, No. 3/4, 2018

Abstract: This research presents the selection of an appropriate decline curve analysis (DCA) methodology according to the transient production performance of a multi-fractured horizontal well in an unconventional gas field by using the cumulative production incline rate (IQ_p) The IQ_p introduced in this research is the change of cumulative production per unit time divided by the cumulative production. The IQ_p was confirmed for use as an indicator that could generalise and quantify a production decline through the analysis of well production data. The IQ_p values of eight and four DCA methods were applied to the production data generated by a reservoir simulation. The Duong method forecasted the production trends most accurately when the IQ_p exceeded 0.25%, while the YM-SEPD method was the most preferable for the rates below 0.05%. In addition, the analysis of production data for shale gas wells in Canada and the USA matched the simulation results, confirming that it would be reasonable to use the IQ_p in order to select a DCA method to forecast the production of unconventional gas wells. [Received: February 23, 2017; Revised: December 7, 2017; Accepted: December 9, 2017]

Online publication date: Tue, 10-Jul-2018

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