Experimental study on rock fracture toughness under temperature and confining pressure coupling condition DOI Creative Commons
Bo Cai,

Nailing Xiu,

Dongxu Li

и другие.

Frontiers in Earth Science, Год журнала: 2025, Номер 13

Опубликована: Май 30, 2025

The fracture toughness is an essential mechanical parameter to measure the difficulty of hydraulic expansion. As reservoir depth increases, temperature and stress become higher. In particular, high-temperature high-pressure characteristics 10,000-m-deep are particularly pronounced. Furthermore, investigating evolution under such coupled thermomechanical conditions serves as a critical focus ultra-deep studies, providing insights for optimizing fracturing designs. This study investigates effects confining pressure on carbonate rocks through systematic experimental theoretical analyses. Utilizing outcrop samples from Cambrian Sholbrak Formation (analogous target layer Ke exploration well), tests were conducted coupling (25°C–200°C, 0–200 MPa) via double-wing symmetric crack thick-wall cylinder method implemented GCTS high-temperature/high-pressure rock mechanics system. Key findings reveal temperature-dependent degradation (40% reduction 25°C 200°C at zero pressure) pressure-driven enhancement (76% increase 0 100 MPa ambient temperature). A damage mechanics-based constitutive model was developed quantify these dual effects, demonstrating strong agreement with data (mean absolute error <5%). addresses gap in characterization deep conditions, enabling enhanced accuracy propagation simulations stimulation.

Язык: Английский

Experimental study on rock fracture toughness under temperature and confining pressure coupling condition DOI Creative Commons
Bo Cai,

Nailing Xiu,

Dongxu Li

и другие.

Frontiers in Earth Science, Год журнала: 2025, Номер 13

Опубликована: Май 30, 2025

The fracture toughness is an essential mechanical parameter to measure the difficulty of hydraulic expansion. As reservoir depth increases, temperature and stress become higher. In particular, high-temperature high-pressure characteristics 10,000-m-deep are particularly pronounced. Furthermore, investigating evolution under such coupled thermomechanical conditions serves as a critical focus ultra-deep studies, providing insights for optimizing fracturing designs. This study investigates effects confining pressure on carbonate rocks through systematic experimental theoretical analyses. Utilizing outcrop samples from Cambrian Sholbrak Formation (analogous target layer Ke exploration well), tests were conducted coupling (25°C–200°C, 0–200 MPa) via double-wing symmetric crack thick-wall cylinder method implemented GCTS high-temperature/high-pressure rock mechanics system. Key findings reveal temperature-dependent degradation (40% reduction 25°C 200°C at zero pressure) pressure-driven enhancement (76% increase 0 100 MPa ambient temperature). A damage mechanics-based constitutive model was developed quantify these dual effects, demonstrating strong agreement with data (mean absolute error <5%). addresses gap in characterization deep conditions, enabling enhanced accuracy propagation simulations stimulation.

Язык: Английский

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