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Shales Leaching Modelling for Prediction of Flowback Fluid Composition

Department of Process Engineering and Chemical Technology, Faculty of Chemistry, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland
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Energies 2019, 12(7), 1404; https://doi.org/10.3390/en12071404
Received: 11 February 2019 / Revised: 4 April 2019 / Accepted: 8 April 2019 / Published: 11 April 2019
(This article belongs to the Special Issue Shale Oil and Shale Gas Resources)
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Abstract

The object of the paper is the prediction of flowback fluid composition at a laboratory scale, for which a new approach is described. The authors define leaching as a flowback fluid generation related to the shale processing. In the first step shale rock was characterized using X-ray fluorescence spectroscopy, X-ray diffractometry and laboratory analysis. It was proven that shale rock samples taken from the selected sections of horizontal well are heterogeneous. Therefore, the need to carry a wide range of investigations for highly diversified samples occurred. A series of leaching tests have been conducted. The extracts were analyzed after leaching to determine Total Organic Carbon and selected elements. For the results analysis significant parameters were chosen, and regression equations describing the influence of rocks and fracturing fluid parameters on the flowback fluid composition were proposed. Obtained models are described by high values of determination coefficients with confidence coefficients above 0.99 and a relatively low standard deviation. It was proven that the proposed approach regarding shale leaching can be properly described using shale models at a laboratory scale, however scaling up requires further investigations. View Full-Text
Keywords: fracturing fluid; flowback fluid; leaching; solid-liquid extraction fracturing fluid; flowback fluid; leaching; solid-liquid extraction
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Rogala, A.; Kucharska, K.; Hupka, J. Shales Leaching Modelling for Prediction of Flowback Fluid Composition. Energies 2019, 12, 1404.

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