... ABSTRACT A novel stimulation method of the hydraulic fracturing with cyclic shock wave pre-cracking for CBM horizontal wells is proposed to extend the control range of artificial fractures. The results of rock mechanics and physical tests show that the permeability, porosity and strength...

...). geologist mineral united states government geology metals & mining geopolymer loading engineering perera-mercado reservoir geomechanics specimen fracture toughness os sosa geological subdiscipline hedayat brazilian disk ii fracture toughness yanqui morale strength upstream oil...

..., density, water absorption, and compressive strength, were investigated. The mode I fracture toughness of the ceramics was assessed by subjecting a notched semi-circular bending (NSCB) specimen to three-point bending loading. The full-field strains on the surface of the specimens were measured using...

... stress that led to the development of the measured breakout. Most commonly, Mohr-Coulomb failure criterion is used which disregards the influence of intermediate stress on strength. Different polyaxial criteria have been proposed to include this effect. Here, we first review selected polyaxial criteria...

... drillability tester. The result shows that Young's modulus and compressive strength increase with the increase of confining pressure. High temperature weakens the mechanical properties of granite under the same confining pressure. The specific manifestation is that density, mass, longitudinal wave velocity...

.... Finally, the results indicated that the newly developed device was applicable for the physical and mechanical properties investigation of grouting reinforced for broken rock under different temperatures, which also had the advantage of small size and flexible installation. The strength, ultrasonic...

... particles are investigated through the particle stiffness, strength, dimension or distribution mode. To improve the performance of AE monitoring, the applicable monitoring parameters in different simulated conditions are determined. For the backfill particles, it can promote the ability of AE monitoring...

... practice, shales were treated as isotropic for mud window calculation and trajectory design. However, organic rich shales are anisotropic due to their laminated structure and chemical properties. Thus, it is of vital importance to investigate the anisotropic strength of shale both theoretically...

... acoustic emission (AE) monitoring, and detailed pre- and post-test micro-CT imaging of the samples. It has been used to characterize the strength of interface samples from two NF. The micro-CT imaging of the samples and measured strength clearly show the porous material strength determines the failure...

... understand the potential implication of geothermal energy extraction over time. geology geological subdiscipline heat extraction geologist extraction permeability upstream oil & gas united states government reservoir geomechanics mechanical behavior fracture strength mechanical...

... width-to-height ratios of 5 to 10. In the course of stope extraction, the dimensions of the pillars are altered, namely the height of pillars is increased and the width of pillars may be decreased. Consequently, the pillar strength is reduced and pillar crushing is triggered. A stable crushing process...

... of residual strain that occurred during the ice-water phase change. The micro-cracks in sandstone samples after FTCs reflect the damage caused by FTCs. The uniaxial compressive test is carried out to evaluate the deterioration of FTCs on uniaxial compressive strength (UCS) and Young's modulus of sandstone...

... ABSTRACT The casing is one of the main barriers to ensuring the well integrity. Casing integrity damage due to eccentricity and corrosion is a severe failure mode. This study aims to evaluate the time-variant burst strength of casing with geometric eccentricity in a corrosion environment...

... ABSTRACT The tensile strength of crystalline rocks in Brazilian tests (BT) shows a more significant size dependency than the uniaxial compression strength in uniaxial compression tests (UCT), while the micro-mechanism is still unclear. This study seeks to elucidate the micro-mechanism...

... can affect the properties of the sealing material like cement and create leakage paths. Portland G cement samples were submitted to TC and exposed to a supercritical CO 2 environment, respectively. The results show that after submitting to more than 100 TC, the strength of the cement sample can...

... ABSTRACT Polycrystalline diamond compact (PDC) is widely used in petroleum engineering drilling due to its strong wear resistance, fast penetration rate and high bit footage. But with the increase of formation depth, the formation rocks become dense, high strength and difficult to be destroyed...

... ABSTRACT Acid fracturing is an essential stimulation technology to increase the production of carbonate reservoirs. However, acid usually softens the rock, and the stability of the fracture hydraulic conductivity is hardly maintained. Therefore, rock strength after an acid treatment is crucial...

...., 2012). Another importance of lowering slurry density is in the avoidance of loss circulation which could occur if the hydrostatic pressure of the slurry exceeds the fracture strength of the surrounding formation (Sugama, 2007). Some methods of achieving low density slurries include foamed cement...

... of the engineered buffer material. This study investigated the shearing behavior of glass fiber-reinforced bentonite through a series of direct-simple shear tests on the bentonite samples. From this laboratory experiment, shear strength parameters such as cohesion and friction angle were evaluated for both peak...

..., including the pores and fractures in the rock, and hence change the permeability of the rock. Studies demonstrate that grain size significantly affects the mechanical properties and strength of rock, yet little research exists on the effect of grain size on stress-sensitive seepage behavior. In this study...