Huff-N-Puff Gas Injection for Enhanced Condensate Recovery in Eagle Ford

Authors
Reza Ganjdanesh (The University of Texas at Austin) | Wei Yu (The University of Texas at Austin) | Mauricio Xavier Fiallos Torres (The University of Texas at Austin) | Kamy Sepehrnoori (The University of Texas at Austin) | Erich Kerr (EP Energy) | Raymond Ambrose (EP Energy)
DOI
https://doi.org/10.2118/195996-MS
Document ID
SPE-195996-MS
Publisher
Society of Petroleum Engineers
Source
SPE Annual Technical Conference and Exhibition, 30 September - 2 October, Calgary, Alberta, Canada
Publication Date
2019
Document Type
Conference Paper
Language
English
ISBN
978-1-61399-663-8
Copyright
2019. Society of Petroleum Engineers
Keywords
Huff-n-puff, Eagle Ford, Unconventional EOR, Field Pilot Test, Condensate
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Abstract

As the pressure drops below dew point in an unconventional gas-condensate reservoir, the liquid drops out of gas phase and forms an oil phase in matrix and fracture. The volume of oil phase formed in the matrix mostly stays below the residual oil saturation, i.e., the oil will be trapped in matrix permanently if enhanced oil recovery techniques are not applied. The huff-n-puff process has been performed and shown the potential of improving the recovery from tight oil reservoirs. The objective of the study was to investigate the feasibility of huff-n-puff EOR in a gas condensate reservoir in Eagle Ford. The studied section of the field contains 13 horizontal producers. The wells have been producing for 4 to 8 years and the oil production rate of each well declined below 10 barrels per day.

Compositional reservoir simulation was used to predict the performance of enhanced oil recovery. A sector model was built for the area selected as the prospective candidate for gas injection. The embedded discrete fracture model (EDFM) was used for modeling the fractures. A Peng-Robinson equation-of-state model was prepared based on the early produced samples from the wells. The only available gas for injection was the produced gas from the surrounding producers. A thorough phase behavior analysis was conducted to understand the miscibility of the injected gas and the in-situ fluid.

The field production data was used to history match the sector model. The field data of the initial huff-n-puff cycles were incorporated into the history match to fine tune the model. The robust sector model was employed to forecast the performance of gas huff-n-puff in 4 infill wells for 5 years of EOR operation.

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