Benge, Margaret and Bunger, Andrew
(2023)
Supporting Data: Creep Properties of Shale and Predicted Impact on Proppant Embedment for the Caney Shale, Oklahoma.
[Dataset]
(Submitted)
Abstract
As part of characterizing the material properties of the Caney shale, core sample experiments generated data from unconfined, triaxial, and creep testing. This data is presented in the paper and the impact of these properties on fracture closure and proppant embedment are discussed. The data presented includes axial and radial strain for single-stage triaxial testing conducted at 3000 psi confining pressure, including the correlating Young’s modulus, Poisson’s ratio, Friction angle, and Cohesion. Friction angle and Cohesion are also presented with the measured maximum strength of the samples with respect to different confining pressures. Additionally, the creep compliance over time is presented for the multiple load/unload stages of creep testing, with specific attention paid to the 72-hour loading stage and the corresponding power-law estimations of creep compliance over time.
From analysis of the data, it was found the unconfined and triaxial properties were insufficient to differentiate the nominally ductile zones from the nominally brittle zones. Zones which experienced more creep deformation over time, a ductile behavior, did not have the corresponding low Young’s modulus which would be expected. While the ductile zones did have lower unconfined compressive strength than the reservoir zones, this metric is not a reliable indication of ductility as other factors such as the presence of internal conglomerations could impact these results. To properly describe the behavior of a given formation, unconfined, triaxial, and creep testing are required, and only creep testing is capable of differentiating between ductile zones, which will undergo more creep, and brittle zones.
Detailed results and analyses are provided in the corresponding paper. This document serves as a Readme file for the supporting data.
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