Acta Geotechnica, Год журнала: 2024, Номер unknown
Опубликована: Ноя. 23, 2024
Язык: Английский
Rock Mechanics and Rock Engineering, Год журнала: 2025, Номер unknown
Опубликована: Янв. 12, 2025
Язык: Английский
Процитировано
2
Acta Geotechnica, Год журнала: 2023, Номер 18(10), С. 5147 - 5164
Опубликована: Июнь 1, 2023
Язык: Английский
Процитировано
17
Acta Geotechnica, Год журнала: 2025, Номер unknown
Опубликована: Янв. 27, 2025
Язык: Английский
Процитировано
0
Energies, Год журнала: 2024, Номер 17(8), С. 1977 - 1977
Опубликована: Апрель 22, 2024
Understanding the shear mechanical properties of shale reservoirs is great significance in study formation stability around horizontal wells and propagation evolution fractures for fracturing. However, existing direct test results are limited due to small sample sizes low rates. Based on previous experimental research results, anisotropic reservoir tests with different conditions were explored this study. It was found that mode, strain rate, normal stress have a significant impact deformation failure characteristics shale. The peak displacement, strength, stiffness present an increasing trend fluctuation, increase bedding angle. strength decreases decrease descends rate. shape fracture zone mode exhibit effect characteristics. fractal dimension surface morphology shows fluctuation variation Further, rate play dominant role surface. larger strengthens roughness morphology. provide theoretical reference determining engineering geomechanics reservoirs.
Язык: Английский
Процитировано
3
Acta Geotechnica, Год журнала: 2024, Номер 19(10), С. 6691 - 6710
Опубликована: Апрель 25, 2024
Abstract The presence of abundant clay components and microporous structure in shale results its high hydrophilicity, making a water-rich environment inevitable petroleum exploration projects. Therefore, it is crucial to consider the influence bedding structure, moisture content, confining pressure, their combined effects on geomechanical properties shale. This article aims investigate mechanical deep under varying water content conditions, elucidate failure mode mechanism actual engineering scenarios, explores interplay between stress, other factors properties. evaluation wellbore stability fracture propagation proposed based laboratory experiments using triaxial stress strain data, along with application energy evolution theory. experimental procedures encompass an analysis shale's microscopic as well anisotropic compression tests conducted different contents pressures. demonstrate that exhibits dense pores microstructure displays pronounced characteristics macrostructure. within these pores, situ formation, significantly influences anisotropy decreases increasing but performance still decreases. Under increase pressure some extent enhances deformation characteristics, which related modes However, detrimental effect persists. In order quantify impact factors, this study utilizes elastic modulus indicator coupling effect. It combines curve obtained from proposes index for suitable assessing (the called SI r ) crack expansion brittleness BI ). calculation reveal that, during drilling process, excavating parallel direction while maintaining low yields higher value, indicating better stability. On hand, reservoir fracturing, fracturing perpendicular result smaller value. approach more beneficial network engineering.
Язык: Английский
Процитировано
3
International Journal for Numerical and Analytical Methods in Geomechanics, Год журнала: 2023, Номер 48(4), С. 1018 - 1045
Опубликована: Дек. 27, 2023
Abstract Solid deformation is always a crucial factor of gas transport in sedimentary rocks. While previous studies adopt the assumption isotropic poroelastic deformation, anisotropic poroelastoplastic rarely considered, despite anisotropy being ubiquitous property natural In this work, an poromechanical model established to analyze matrix porosity and apparent permeability evolutions during process migration. Using thermodynamic formulation that treats fluid–solid interface as independent phase, we derive rate form for obtain new dissipation function contains three parts: dissipations from solid adsorption, fluid flow. For justify rationality adopted model; flow, updated can be substituted into sophisticated models full‐scale analysis; recently developed constitutive appropriate rocks exhibiting transverse isotropy both elastic plastic responses work. Through novel stress‐point simulation incorporating two effective stress measures adsorption strain, patterns are obtained, which fit experimental data quite well cannot reproduced poroelasticity. The advantages our include consistency ability employ finite‐element‐based formulation. Finally, initial‐boundary value problem production considering plasticity conducted, effects bedding plane different highlighted.
Язык: Английский
Процитировано
6
Journal of Rock Mechanics and Geotechnical Engineering, Год журнала: 2024, Номер unknown
Опубликована: Авг. 1, 2024
Язык: Английский
Процитировано
2
International Journal for Numerical and Analytical Methods in Geomechanics, Год журнала: 2024, Номер unknown
Опубликована: Сен. 19, 2024
ABSTRACT We present a double‐phase–field framework for tensile fracturing processes in transversely isotropic rocks. Two distinct phase‐field variables are introduced to represent smeared approximations of fractures along the weak bedding planes and through anisotropic rock matrix, respectively. Driving forces that control fracture propagation constructed as stress‐based formula with recently developed failure criterion distinguishes two modes For numerical implementation, we adopt staggered integration scheme decouple governing equations so displacement field can be updated sequence given loading step. The finite element formulation proposed is detail this paper implemented an in‐house code. implementation then validated by reproducing uniaxial tension test results Lyons sandstone. After that, conduct simulations on pre‐notched square plate loaded demonstrate features framework. Finally, three‐point bending tests Pengshui shale show model reproduce force–displacement curves patterns specimens different plane orientations observed laboratory experiments.
Язык: Английский
Процитировано
1
Tunnelling and Underground Space Technology, Год журнала: 2024, Номер 157, С. 106335 - 106335
Опубликована: Дек. 24, 2024
Язык: Английский
Процитировано
1
Environmental Earth Sciences, Год журнала: 2024, Номер 83(9)
Опубликована: Апрель 29, 2024
Abstract Under the combined influences of confining pressure, lithology and bedding, deformation failure characteristics layered rocks become more complex posing a significant challenge in safe underground excavations. In this study, two groups specimens were prepared with various bedding angles including 0°, 10°, 20°, 30°, 45°. X-ray diffraction scanning electron microscopy employed to analyze mineral composition internal microstructures specimens. Triaxial compression tests conducted on subject different pressures. Then, orthogonal matrix analysis was utilized determine specific influence weights lithology, peak differential stress, elastic modulus strain rock samples. Finally, by implementing proposed weight matrix, statistical damage constitutive model for under coupled effects developed. It found that stress difference, cohesion, friction angle decrease as increases, while increases angle. Additionally, exhibited distinct patterns pressure. The averaged are 40.99%, 23.87%, 35.14%, respectively. analytical simulation results validated experimental study literature confirming capability capturing stress–strain behavior
Язык: Английский
Процитировано
0