... stress regime karakus experiment upstream oil & gas breakdown pressure notch spacing international journal mining science notch spacing breakdown model ARMA 23 385 The Effect of Quantity and Spacings of Notches on Hydraulic Fracturing at Different Stress Regimes Powlay, B. The University...

... in the temperature difference between the rock and the injected fluid could induce the larger fracture tortuosity and fracture apertures effectively. The breakdown pressure decreased by 52% as the initial rock temperature rise from 100°C to 300°C. The present study is expected to provide an in-depth understanding...

... ABSTRACT Because of the difficulties in producing energy supply, fracturing-flooding has been applied in water driven low-permeability oil reservoirs, in which water is injected near the breakdown pressure to produce a large number of microfractures and increase the sweeping area. In this work...

... significant influence on granite; (3) the modified maximum tensile stress criterion is expressed as multiple sets of nested vertical planes in the principal stress space; (4) ignoring the influence of confining pressure on tensile strength, the breakdown pressure is underestimated, the fracture length...

... ABSTRACT Accurately estimating rock breakdown pressure is crucial for designing effective hydraulic fracturing operations, particularly in unconventional ultra-tight reservoirs where hydrocarbon extraction is challenging. However, conducting experimental studies on hydraulic fracturing is both...

... fracturing fluids due to variability in properties such as viscosity, density, compressibility, leakoff, etc. Several laboratory experiments have recently been performed which indicated differences in breakdown pressure, fracture growth rate, complexity of the created fractures and amount of fracturing fluid...

... ABSTRACT Multi-branch radial boreholes can be drilled and combined with hydraulic fracturing to efficiently stimulate tight gas reservoirs. This paper experimentally investigates how horizontal stress difference affects fracture geometry and breakdown pressure in multi-branch radial borehole...

... ABSTRACT: In hydraulic fracturing, it is not unusual to encounter difficulty in breaking down rock formations. This is often the case when the well design or pumping equipment has a limitation in reaching a higher-than-expected breakdown pressure. Such high breakdown pressures could...

... scarcely studied. The intention of this study is to investigate the fracturing mechanism and to compare the fracture geometry characters between water and CO 2 fracturing, and a series of fracturing tests on sedimentary rocks was therefore conducted. Experimental results show that breakdown pressure of CO...

... this preferred orientation, the effective length of the lateral diminishes, which means that the same SRV could be reached with a shorter well at the optimum orientation. Finally, a computational code for a perforated well in an arbitrary direction was implemented to calculate the breakdown pressure for every...

... pathways to enhance reservoir deliverability. In this paper, we present a laboratory-scale example of the new concept of cyclic injection hydraulic fracturing to help reduce fracture breakdown pressure (FBP) and maximize stimulated reservoir area. It is hypothesized that the repetitive changes in stress...

...-existing fracture pmma specimen hydraulic fracture interface interaction behavior fracture interaction behavior different type breakdown pressure propagation fracture ARMA 21 1146 A visualization study on interaction between hydraulic fractures and natural fractures Zixiao Xie, Xiaoguang Wu...

... that the P-velocity decreased with the increasing of thermal treatment temperature, while obvious thermal cracking occurred especially when the thermal treatment temperature was higher than 300 °C. Due to the obvious thermal shock effect, the breakdown pressure significantly decreased. Meanwhile...

... and interpreting the toughness from the breakdown pressure (Abou-Sayed et al. 1978). However, the interpretation of the observed breakdown pressure relies critically on assuming that (i) the fluid pressure in the slots and the cracks ahead is uniform and (ii) the peak (breakdown) pressure is the fracture...

... & gas radial borehole diameter hydraulic fracture radial borehole axis horizontal stress rock sample adjacent layer reservoir characterization reservoir geomechanics directional drilling engineering borehole drilling operation breakdown pressure single radial borehole azimuth experiment...

... was employed to not only map and characterize the geometry of the hydraulic fracture network but also to determine the source mechanisms of the individual cracks through moment tensor inversion. Higher breakdown pressures and larger seismic energy were encountered for higher injection rates with tensile events...

... CO 2 fracturing reduced the breakdown pressure by 15% and increased the number of fractures. The soaking treatment of the open-hole section of fracturing specimen with CO 2 -saturated brine reduced the breakdown pressure by 21% and improved the fracture complexity conspicuously in the case...

... properties differ from formation to formation further requiring to optimize the design of the fracturing process. This paper aims to address one such issue by quantifying the reduction in breakdown pressure because of saturation condition of the reservoir. An experimental study is performed on tight...

... of the breakdown pressure. Finally, the comparison of surface micro-morphology of different rocks before and after fracturing suggests that this process can extend the preexisting fractures and create some new and complex fractures. The micro-scale damage will be beneficial to the migration and accumulation of oil...

... ABSTRACT: Formation breakdown failure is one of the major challenges that operators face when fracking tight and high stress reservoirs. Several lost potentials are recorded worldwide due to high breakdown pressure that exceeds pumping limitations or completion rating. Increasing...