DBPapers
DOI: 10.5593/SGEM2016/B13/S06.115

POSSIBILITIES OF THE COMBINED USE OF MICROCOMPUTED TOMOGRAPHY AND LAND GEOCHEMICAL SURVEYS FOR INCREASING HYDRAULIC FRACTURING EFFICIENCY

A. Ponomarev, M. Zavatsky, I. Popov, O. Veduta, D. Leontyev
Tuesday 6 September 2016 by Libadmin2016

References: 16th International Multidisciplinary Scientific GeoConference SGEM 2016, www.sgem.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-57-5 / ISSN 1314-2704, June 28 - July 6, 2016, Book1 Vol. 3, 913-920 pp

ABSTRACT
The paper discusses the problem of the efficiency of hydraulic fracturing as a method of increasing oil recovery. Insufficient studies of pore space structure often result in the following: hydraulic fracturing doesn’t achieve its goal - oil recovery increase or the debit of oil wells is increased because of the higher water content.
To get necessary data for forecasting the efficiency of hydraulic fracturing a series of experiments were conducted using three-dimensional modeling of pore space and cement by the microcomputed tomography (mCT). 3D modeling has shown that the mCT provides enough information for studying the heterogeneity of pore space including anisotropy of reservoir porosity and permeability at the microlevel. But the representativeness of these data is insufficient because of the small sample size. So the authors additionally analyzed the results of land geochemical surveys to get information about the vertical fluid permeability of the sedimentary cover.
The research has shown that the results of land geochemical surveys can help extrapolate the mCT data on the microstructure of rocks to the macrolevel because high vertical fluid permeability is always associated with the decompactification of the sedimentary cover.
The planning of hydraulic fracturing with the consideration of heterogeneity of the microstructure of a reservoir rock and the data on the vertical fluid permeability will allow not only increasing oil recovery but also reducing environmental impact from hydraulic fracturing.

Keywords: hydraulic fracturing, enhanced oil recovery, x-ray microtomography, geochemical survey, fluid-dynamics.