...-term conductivity of the fracture. A servo-controlled triaxial compression test machine and a linear variable displacement transducer (LVDT) are used to carry out the uniaxial loading and unloading creep test in this paper. The viscoelastic, viscoplastic, elastic, and plastic strains of rock...

... (creep for constant stress boundary condition) is an important contributor. To shed light on the macro-scale creep behaviour of organic-rich shales and micro-scale processes controlling such macro-scale behavior, we conducted a series of multi-scale (micro and macro) creep experiments on the Beetaloo...

... salt caverns in the Hengyang area. Utilizing COMSOL, a numerical simulation is conducted to investigate the long-term creep stability of irregularly shaped salt caverns over a period of 30 years. The impact of salt cavern geometry on long-term stability is quantitatively assessed through key parameters...

... ABSTRACT: Brittle creep in rocks involves the progressive degradation of mechanical properties over time; therefore, monitoring of the damage process is essential for the assessment of long-term behavior of structures in rocks. Numerous studies have explored the link between macroscopic...

... temperature (24 °C), then increased temperature to 50 °C and then from 50°C to 80°C. We reported that the elevated temperatures soften the samples and increase the creep deformation rate. However, the creep behavior of the sample under a cyclic loading pattern and at a constantly elevated reservoir...

... and rock mechanical strength, and elucidated the control mechanism of wellbore stability of composite salt rock; experiments were carried out on the dissolution rate and creep characteristics of salt rock, and a model for characterizing the density and chlorine content of drilling fluids for maintaining...

... field-scale generic model captures the impact of combined drag and back stressing on the salt creep behavior corresponding to cycles of compression and extension, which may lead to substantial loss of cavern volumes over time and diminish the cavern performance for H 2 storage. Our preliminary findings...

... of the ground subsidence rate. In order to ascertain the extent of ground subsidence resulting from oil and gas extraction and to consider the impact of creep in rock formations, it was necessary to conduct a comprehensive study. In this paper, we analyse the data from creep experiments on underground shale...

... step while the stiffness relaxation parameters are determined using the model fit on the borehole creep deformation measured during the pressure hold step. The stiffness relaxation parameters determined from the two test cases are considerably different, implying the altered viscoelastic properties...

... ABSTRACT: Steady-state creep is increasingly used to model structures hosted in salt and potash. This is presumably due to the absence of representative constitutive models available in commercial geomechanics software. We consider a standard suite of tests performed on salt. These include...

... degree - wellbore breakout/limited caving and kinematic pipe constraint, fault slip, and salt creep. These three failure mechanisms might work together or one of them could dominate the pipe sticking. A more comprehensive analysis of the three mechanisms was conducted for the second stuck-pipe incident...

... ABSTRACT: Wells drilled through salt formations can be subject to leakage if a (micro)annulus is present between the salt formation and well casing that allows significant fluid flow over large well sections. Laboratory experiments were performed to assess if natural sealing by rocksalt creep...

... is greater than this value, the casing stress shows a downward trend; Jandhyala (2013) studied the effect of formation creep on cement sheath. The results show that the cement with high elasticity has strong bearing capacity; Li et al. (2014) studied the influence of the elastic modulus of the cement sheath...

... this temperature. These results also suggest that the dominant deformation mechanisms may evolve from frictional granular flow with intergranular pressure solution at low temperatures to grain boundary sliding (GBS) with solid-state diffusion creep at high temperatures. INTRODUCTION Induced seismicity...

... ABSTRACT Casing damage is the main form of wellbore integrity failure, severely affecting oil and gas production. The mudstone has rheological properties under the high temperature and pressure of the formation, and creep deformation of the formation leads to increased external pressure...

... ABSTRACT Time-dependent processes in rock govern its long-term behavior hence understanding of these processes is of great importance especially for long-lasting surface and underground structures. Results from conventional creep experiments have shown that three stages of creep (trimodal...

... is developed. The effects of creep time, eccentricity distance, cement sheath modulus of elasticity and internal casing pressure on wellbore stress were investigated using the finite element method. The results show that for a given eccentricity, the stress on the wellbore increases with creep time, affecting...

... ABSTRACT Rocks exhibit time-dependent creep behavior under constant stress conditions. This can cause damage, instability, and failure of rocks depending on the applied stress levels. Creep behavior is defined by three stages: primary (decelerating), secondary (steady-state), and tertiary...

... ABSTRACT Shale is considered a suitable host rock for geological nuclear waste repositories due to its low permeability and tendency to reduce stress concentrations via creep. However, such a claim has not been carefully examined from the perspective of shale anisotropy caused by its bedding...

... ABSTRACT Shale oil and gas reservoir is a new hotspot of oil and gas exploration and development. It is very important for fracturing production to produce artificial fractures with sufficient conductivity. Shale clay and organic matter content is high, which is easy to creep, and it makes...