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Production Analysis of a Shale Gas Reservoir Using Modified Deconvolution Method in the Presence of Sorption Phenomena

Title
Production Analysis of a Shale Gas Reservoir Using Modified Deconvolution Method in the Presence of Sorption Phenomena
Author
성원모
Keywords
variable production rate; sorption correction; production data analysis; shale gas; pressure transient analysis
Issue Date
2015-10
Publisher
Society of Petroleum Engineers
Citation
2015 SPE Eastern Regional Meeting, ERM 2015; Morgantown; United States; 13 October 2015 through 15 October 2015; Code 119996, Page. 1-11
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. Copyright 2015, Society of Petroleum Engineers.
URI
https://www.onepetro.org/conference-paper/SPE-177320-MShttp://hdl.handle.net/20.500.11754/28222
ISBN
978-161399425-2
DOI
10.2118/177320-MS
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > EARTH RESOURCES AND ENVIRONMENTAL ENGINEERING(자원환경공학과) > Articles
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