On the pressure decline analysis for hydraulic fractures in elasto-plastic materials

Wróbel, Michał; Papanastasiou, Panos; Dutko, M.

doi:10.1016/j.gete.2022.100421

Cited by 4 publications

(1 citation statement)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4d,e, and f). Such evidence of nonlocalized (spatially extended) plastic deformation induced by fracture propagation (stress/hydraulic) are also observed and proven in the numerical/experimental studies (Brantut et al 2011;Huang and Chen 2021;Huang and Ghassemi 2016;Liu and Brantut 2022;Parisio et al 2021;Ramos Gurjao et al 2022;Richard et al 2021;Schmidt et al 2022;Tan et al 2021;Vinci et al 2014;Wrobel et al 2022;Zhang et al 2020).…”

Section: Geometry Of Hydraulic Fracturementioning

confidence: 61%

Hydraulic fracturing: Laboratory evidence of the brittle-to-ductile transition with depth

Feng¹,

Liu²,

Sarout³

et al. 2023

Preprint

View full text Add to dashboard Cite

Understand the propagation of hydraulic fracture (HF) is essential for effectively stimulating the hydrocarbon production of unconventional reservoirs. Hydraulic fracturing may induce distinct failure modes within the formation, depending on the rheology of the solid and the in-situ stresses. A brittle-to-ductile transition of HF is thus anticipated with increasing depth, although only scarce data are available to support this hypothesis. Here we carry out laboratory hydraulic fracturing experiments in artificial geomaterials exhibiting a wide range of rheology: cubic samples 50x50x50 mm3 in size are subjected to true triaxial stresses with either a low (σv = 6.5 MPa, σH =3 MPa, and σh =1.5MPa), or a high (15 MPa, 10 MPa, and 5MPa) confinement. The 3D strains induced by hydraulic fracturing are monitored and interpreted; and X-ray Computed Tomography (CT) imaging is used to document the HF geometry. Finally, a correlation between the normalized fracture area (AFN) and the brittleness index (BI) of tested samples is introduced. Our results reveal that: (i)The intermediate stress plays a profound role in hydraulic fracture propagation subjected to the designed stress regimes (i.e., the transitional intermediate strain observed from brittle to ductile samples); (ii) The transitional inclined angle (high-to-low) of HFs are observed from brittle/semi-brittle samples to semi-ductile/ductile samples; (iii) The normalized fracture area (AFN) is shown to be larger when the BI is higher; the AFN, tortuosity and roughness of the HF are shown to be larger as the increase of confinement.

show abstract