... ABSTRACT: High Pressure Water Jetting (HPWJ) can be applied at the drill bit-rock interface and is especially promising for deep highly confined geothermal reservoir rocks if used for peripheral groove cutting in the bottom hole. The groove can greatly reduce the mean stress making the work...

..., rock breaking volume, MSE of rock breaking and distribution of cuttings of PDC fractured conglomerate, and the surface topography of the cutting groove of PDC fractured conglomerate are compared. The experimental results show that the cutting force of the triple-ridged cutter is the most stable...

... between the cross-sections prior and posterior to expansion, and the stress magnitudes and orientations can be estimated from the circumferential distribution of the core expansion. drilling operation geologist reservoir geomechanics reservoir characterization groove orientation diameter...

... weakening treatment method is mainly through the overlying roof drilling hole in the predetermined height of the groove, through the sealing of the hole and water injection to make high-pressure water fractured rock destruction along the grouting (Huang et al.,2013). Compared with the blasting method...

...%. Percussion drilling using down the hole (DTH) hammer has proven to be efficient in drilling through hard rocks. In ORCHYD project, we combine high-pressure water jet (HPWJ) with a DTH hammer to increase the rate of penetration (ROP) by a factor of 3 to 4. The HPWJ creates a peripheral groove in the rock...

... on granite. The rock breakage process, the initiation and propagation of micro-cracks, the surface topography and fracture morphology of the cutting groove and large-size debris were analyzed. A three-dimensional rock cutting model with a CDE cutter was established using the finite element method to study...

... if one should be able to use excessive force for removal. For cases where removal of the cemented casing is necessary different approaches have been considered. Introducing grooves to the casing lowers the pulling force to remove it from the cemented wellbore and has been conceptually considered...

... breaking. At the same time, we measured the mass fraction of cuttings with different sizes and morphology of cutting grooves. The results show that micro-cracks would be induced when high-pressure water jet contact with the rock with high temperature. Consequently, the brittle failure dominates more easily...

..., it is found the optimum temperature for TBM excavation is 200 degC. groove water evaporation particle cutter ring Upstream Oil & Gas cutter reservoir geomechanics mechanism friction heat Reservoir Characterization disc cutter Efficiency water content temperature field mineral...

... ABSTRACT: We ideate a new specimen configuration to improve the Brazilian test, i.e. grooved Brazilian disc (GBD). With a pair of narrow and shallow groove cut at opposite ends of the loading diameter, GBD relieves the shortcoming of non-central crack initiation possibly inherent...

... investigated the issue of balancing the selection between the two intertwined parameters: the damping ratio and the cutter advancing speed. Finally, we carried out three-dimensional analyses in modeling groove cutting as a step toward building a tool to analyze the cutting action of a drilling bit. 1...

... ABSTRACT: The paper deals with the influence of the cutting geometry on both the magnitude and orientation of the cutting force acting on a sharp cutter tracing a groove on the surface of a rock sample. Tests were carried out with various cutter geometry (circular, triangular and rectangular...

... testing in a groove and moisture content of the rock sample. 1. INTRODUCTION a rock’s physical properties [2, 5, 6]; and CAI test conditions [3, 7]. Since its inception in the mid 1960s though perhaps more significantly since the mid-1980s following two landmark publications, the CERCHAR...

... with full-face tunnel boring machines (TBMs) involves the indentation of a rock surface by rolling disc tools. Excavation occurs as fractures, extending from the locus of chip indentation, propagate between concentric disc grooves and liberate rock chips from the intact rock face. Since disc cutting...

... the chips, fragments and the sides of the groove. INTRODUCTION In principle, a rock-cutting tool is designed to impart maximum deformation in the rock per input energy while at the same time wear of the tool is a minimum. All too often, however, tools fall short of being ideal because the exact nature...

... in terms of specific energy. The authors have investigated the possibility of reducing the forces on the cutter by inducing a tensile state of stress in the rock in the vicinity of the groove being cut by a drag bit. The prestressing was accomplished by two methods by placing a Georgia Granite in pure...

... industry looks to increasing mechanization to provide substantial gains in productivity, 'it seems inevitable that this hitherto little explored design approach will become a virtual necessity. metals & mining data mining Upstream Oil & Gas groove cutter upward Mining geometry...

.... A focused beam slightly offset from the cutter path gives the most improvement both when cutting on a smooth surface and when cutting in previously cut grooves. INTRODUCTION Excavations in the form of surface mining are believed to have first been conducted about 15,000 years ago (9) with very primitive...

...) and Slobodov 3). Reservoir Characterization reservoir geomechanics Upstream Oil & Gas groove quartzite elasticity test cube absolute rock stress measurement minor principal stress strain gauge borehole diameter strain reading cube gauge strain cell compressire load stress-relieving...