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AuthorKasha, A. A.
AuthorSakhaee-Pour, A.
AuthorHussein, I. A.
Available date2023-07-12T07:28:17Z
Publication Date2022
Publication NameSPE Reservoir Evaluation and Engineering
ResourceScopus
URIhttp://dx.doi.org/10.2118/208579-PA
URIhttp://hdl.handle.net/10576/45408
AbstractCapillary pressure plays an essential role in controlling multiphase flow in porous media and is often difficult to be estimated at subsurface conditions. The Leverett capillary pressure function J provides a convenient tool to address this shortcoming; however, its performance remains poor where there is a large scatter in the scaled data. Our aim, therefore, was to reduce the gaps between J curves and to develop a method that allows accurate scaling of capillary pressure. We developed two mathematical expressions based on permeability and porosity values of 214 rock samples taken from North America and the Middle East. Using the values as grouping features, we used pattern-recognition algorithms in machine learning to cluster the original data into different groups. In each wetting phase saturation, we were able to quantify the gaps between the J curves by determining the ratio of the maximum J to the minimum J. Graphical maps were developed to identify the corresponding group for a new rock sample after which the capillary pressure is estimated using the average J curve of the identified group and the permeability and porosity values of the rock sample. This method also provides better performance than the flow zone indicator (FZI) approach. The proposed technique was validated on six rock types and has successfully generated average capillary pressure curves that capture the trends and values of the experimentally measured data by mercury injection. Moreover, the proposed methodology in this study provides an advanced and a machine-learning-oriented approach for rock typing. In this paper, we provide a reliable and easy-to-use method for capillary pressure estimation in the absence of experimentally measured data by mercury injection. Copyright 2022 Society of Petroleum Engineers
SponsorWe would like to acknowledge the support of Qatar National Research Fund (a member of Qatar Foundation) through Grant # NPRP11S-1228-170138. The findings achieved herein are solely the responsibility of the authors.
Languageen
PublisherSociety of Petroleum Engineers (SPE)
SubjectArtificial intelligence
Flow in porous media
Formation Evaluation & Management
Information Management and Systems
Reservoir Characterization
Reservoir Fluid Dynamics
TitleMachine Learning for Capillary Pressure Estimation
TypeArticle
Pagination1-20
Issue Number1
Volume Number25


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