Production analysis of a shale gas reservoir using modified deconvolution method in the presence of sorption phenomena

J. Kim, Y. Jang, T. Ertekin, W. M. Sung

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

When analyzing production data during reservoir characterization, pressure transient analysis requires a constant production rate during the entire production period. However, because of the extremely low permeability of shale formations, the flow regime changes over the long period of production. Therefore, it is rarely possible to acquire production data at a constant rate. In addition, as pressure declines with production in a shale gas reservoir, desorption of gas occurs, leading to nonlinearities due to large changes in gas compressibility, and it should be linearized for the use of deconvolution. In this study, we suggest sorption correction for pseudopressure using material balance equation to linearize the pseudopressure- rate relationship. By using this sorption correction term for pseudopressure in the deconvolution, we carried out pressure transient analysis with production data from a shale gas well to obtain the reservoir characteristics. The results show that, without sorption correction, the pseudopressure decline and its derivative varied depending on the magnitude of the desorption. However, with the correction applied, the curves were almost identical regardless of desorption. In the results of the deconvolution analysis with and without the sorption correction, pseudo-linear and pseudo-pseudosteady state flow periods appeared at different times, which explains the anomalous results in the pressure transient analysis. By implementing those results, we analyzed production data acquired from Fayetteville shale. The results show that the reservoir permeability, stimulated reservoir volume, and fracture half-length depended on the use of sorption correction for pseudopressure.

Original languageEnglish (US)
Title of host publicationSociety of Petroleum Engineers - SPE Eastern Regional Meeting 2015, ERM 2015
PublisherSociety of Petroleum Engineers (SPE)
ISBN (Electronic)9781613994252
StatePublished - Jan 1 2015
Event2015 SPE Eastern Regional Meeting, ERM 2015 - Morgantown, United States
Duration: Oct 13 2015Oct 15 2015

Publication series

NameSPE Eastern Regional Meeting
Volume2015-January

Other

Other2015 SPE Eastern Regional Meeting, ERM 2015
CountryUnited States
CityMorgantown
Period10/13/1510/15/15

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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    Kim, J., Jang, Y., Ertekin, T., & Sung, W. M. (2015). Production analysis of a shale gas reservoir using modified deconvolution method in the presence of sorption phenomena. In Society of Petroleum Engineers - SPE Eastern Regional Meeting 2015, ERM 2015 (SPE Eastern Regional Meeting; Vol. 2015-January). Society of Petroleum Engineers (SPE).