Analysis of the Fracture Characteristics and Crack Propagation Mechanism of Fractured Sandstone under Dynamic Loading

Ping, Qi; Li, Xiangyang

doi:10.3390/app14052042

Cited by 1 publication

(1 citation statement)

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“…By combining XRD and SEM scanning electron microscopy, a deeper understanding of the changes in the pore structure characteristics of tight sandstone under the composite action of acidification and supercritical CO 2 can be achieved by comparing untreated and singly treated sandstones. Following this, uniaxial compression tests were conducted on the rock samples to analyze the changes in their mechanical properties [24]. Previous studies have shown that both acid treatment and supercritical CO 2 soaking can alter the pore structure and mechanical properties of rocks.…”

Section: Introductionmentioning

confidence: 99%

Study on Microscopic Characteristics and Rock Mechanical Properties of Tight Sandstone after Acidification–Supercritical CO2 Composite Action: Case Study from Xujiahe Formation, China

Zhao,

Huang,

Liang

et al. 2024

Applied Sciences

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Acidified CO2 fracturing is a viable method for increasing production in deep, tight sandstone reservoirs. However, the potential mechanism of changes in pore structure and mechanical properties of sandstone under acidified CO2 supercritical composite is not clear. Understanding this mechanism is important for the study of crack initiation and extension in tight sandstone reservoirs. This study utilizes sandstone samples from the Xujiahe Formation reservoir in Rongchang District as experimental specimens. The primary focus is to analyze the changes in pore structure and mechanical properties of these samples after acidification–supercritical CO2 composite action. Nuclear magnetic resonance (NMR) and uniaxial compression tests are employed as the main investigative techniques. The results show that there was a physicochemical synergy between the acidification–supercritical CO2 composite effect; the crack initial stress, damage stress, and peak stress of the sandstone after 16 MPa supercritical CO2 acidification treatment were reduced by 20%, 49.5%, and 49.8%, respectively; the crack volumetric strain accelerated and the sandstone evolved from brittle to ductile damage; and the larger pore space and microcracks of the sandstone increased significantly after the treatment, which can be attributed to the gradual dissolution of intergranular cement leading to the formation of new pores connected to the existing pore network. The change mechanism of sandstone after acidification–supercritical CO2 compound treatment is also proposed.

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Section: Introductionmentioning

confidence: 99%