... structural geology fracturing materials experiment concentration tuff reservoir reconstitution mpa technology holder fracture surface roughness proppant fracture conductivity crosslinked acid reconstruction result table 3 ARMA 22 1007 Influencing Factors of Acid Etching Fracture...

... amplitude, frequency, roughness and viscosity affect hydraulic fracture initiation. 1. INTRODUCTION The success of unconventional reservoir development is the benefits of hydraulic fracturing and horizontal wells (Rong et al.,2004; Karacan et al., 2011; Dong et al., 2019; Nguyen et al., 2020; Wang et al...

... as such is uncommon. The main property of a discontinuity is its shear strength. The shear strength has frictional parameters, such as basic friction angle and roughness, and may have a cohesion parameter. In this work, we evaluated the mechanical properties of artificial mechanical discontinuities. The artificial...

... that the surface roughness of the generated fractures is material dependent, i.e., fractures generated in granite were roughest, while fractures formed along the interface had the lowest roughness values. The finding of this study can improve our understanding of the tensile strength and behavior of rock-concrete...

... ABSTRACT: Joint roughness is one of the most important factors which decide the shear behavior of a rock mass. Conventionally, it is quantified into a parameter called Joint Roughness Coefficient (JRC) by visual comparison between Barton’s standard profiles and line profiles of a joint. Since...

... load conditions from each specimen and requires samples with the same roughness. However, it is difficult to obtain samples with the same roughness in the field, so a multi-stage shear test is conducted. A constant normal load section is set as a specimen in the multi-stage shear test. The shear...

... by the rich phyllosilicate content in the shale samples. We believe that the stability of the fracture is affected by the combination of factors such as the mineral composition, roughness of the fracture surface and the pressure of the injected fluid. 1. INTRODUCTION Seismic activity induced by fluid...

... was presented. ABSTRACT: Anisotropy in the mechanical properties of rock is often attributed to bedding and mineral texture. Here, we use 3D printed synthetic rock to show that, in addition to bedding layers, mineral fabric orientation governs sample strength, surface roughness and fracture path under mixed...

... failure surface, and the root mean square was used to calculate scanned point cloud data; a simpler index for calculating roughness based on area variation was established; the surface crack morphology of the sample was drawn by high-resolution photos, and the crack complexity was quantitatively described...

... Abstract Currently, acid etching and conductivity experiments mostly use smooth rock samples to simulate the formation of acid fractures. There are few reports on the influence of fracture rough morphology on acid etching behavior and conductivity. In this paper, digital carving technology...

... piston is used for servo control whereas in BDC the displacement output from two horizontal LVDT's positioned directly on the sheared interface are used for servo control. The frictional characteristics are studied particularly in relation to initial roughness, displacement rate, and normal stress...

... Abstract The present paper focuses on evaluation of existing methods for digitization and quantification of joint roughness. Repeated lidar scans of a number of natural rock joints were registered using Cloud Compare and MATLAB and were then interpolated onto a regular grid for averaging...

... ABSTRACT: This paper utilizes Itasca's PFC3D to simulate linear rock cutting using disc cutters. The objective is to determine the correlation between excavated surface roughness and cutting forces experienced during excavation. The flat-joint BPM model was used to create a synthetic...

.... hydraulic fracturing Reservoir Characterization roughness normal stress fracture characterization static friction friction variation Upstream Oil & Gas experiment shear slip variable normal stress slow slip slip velocity shear stress injection fluid injection slip evolution specimen...

... rock (UCS). However, this approach neglects the influence of other important aspects such as the roughness at the pile-rock interface. This work examines the socket roughness effect on side shear resistance of rock-socketed piles, using DEM 3D numerical models of rock-socketed piles with different...

... methods for rapid and accurate identification of discontinuity parameters subjectively and even from inaccessible areas of the rockfall body. Artificial Intelligence strength Reservoir Characterization modification orientation Upstream Oil & Gas hazard assessment roughness novel semi...

... ABSTRACT: Joint roughness directly affects the behaviour of discontinuities at the laboratory scale and the rockmass at excavation scales. As large infrastructure projects (e.g. deep base tunnels for transportation, large open pit and underground mines with complex geometries, and deep...

... ABSTRACT: Our experiments investigate the role of roughness in fracture permeability and frictional behavior using artificial fractures with controlled roughness. The results show that (1) Rougher surfaces indicate higher frictional stability and frictional strength due to the presence...

... planes with some branches. For both water and SC-CO2 fracturing, higher the confining pressure, higher the breakdown pressure and lower the tortuosity and roughness of the main fractures. Meanwhile, compared with the water fracturing, it is implied that the breakdown pressure of SC-CO2 is generally lower...

... proppant parameters for years. In reality, fracture surface would not be smooth in real condition and the effect of initial roughness of fracture surface should be emphasized. Recently, some experts carried out constructive researches and began to use artificially split rock samples to conduct propped...