... ABSTRACT: Experimental observations from the rock scratch test in sedimentary rocks present compelling evidence that the uniaxial compressive strength (UCS) can be estimated from the specific energy (SE). However, large variations of the SE/UCS ratio are also observed in various types of rocks...

... activity during the test. The scratch probe tip is a Rockwell conical diamond indenter with a 200 μm diameter spherical tip. The materials are loaded progressively using the micro-scratch tester. Fused quartz and borosilicate glass are used to study brittle behavior from scratch test. The glass materials...

... ABSTRACT: The Scratch Test is a quasi-non-destructive method made up of pushing a tool across the surface of a weaker rock at a given penetration depth. The Uniaxial Compression Test is a destructive method of measuring the maximum axial compressive stress a rock can withstand before failing...

... in a depleted heterogeneous reservoir, using subsurface samples from Wolfcamp shale formation and a microbial strain. We first obtained the mechanical properties of shale samples using the scratch test method, in addition to the measurement of their initial porosity and permeability. We treated the shale core...

... ABSTRACT: This paper presents an objective review of two non-destructive methods developed for the rapid and cost-effective testing of compressive strength on rock cores. Rebound impact test and scratch test methods are compared. Respective advantages and drawbacks are listed in terms...

... behavior of Mt. Simon sandstone specimens using a combination of scratch tests, nano-indentation tests, along with advanced imaging techniques such as high-resolution scanning electron microscopy and atomic force microscopy (AFM). Scanning electron microscopy reveals a granular microstructure mainly...

... is an expensive and time consuming process. It would be ideal if the strength of the intact rock could be estimated in the field as an in-situ measurement by running a device inside a borehole. Estimation of the rock strength by scratch tests has been reasonably accurate. Application of this concept...

... of the activity. Besides a comprehensive literature review regarding empirical correlations for predicting rock mechanical properties, this article presents results of uniaxial and scratch tests on a highly heterogeneous limestone sample from offshore wells in Brazil. By comparing S results of uniaxial...

... scratch test standoff distance rock strength high temperature Drilling sample surface rock material 1. INTRODUCTION The exploitation of hydrocarbons and deep geothermal resources relies on finding cost-effective solutions to increase the drilling performance in hard crystalline rocks (Gill, 1983...

... obtained from the scratch test should be combined in order to reduce the uncertainty inherent to the upscaling of mechanical properties. Examples from real case studies show these enhancements include precise core shift estimates, early and ad- hoc recommendations for the selection of plug samples...

... Abstract: This study presents a comparison of three alternative approaches to estimate uniaxial compressive strength (UCS) to traditional uniaxial compressive test for shale which may be incompatible with standard sample preparation. Rebound hardness and scratch tests have been employed...

... strength of rock samples can be estimated by scratching test. A comparison of the required CPU time is presented, which shows significant reduction in the computation time. The main advantage was the ability to calibrate the micro-properties of samples with realistic grain sizes and shapes. Using UCS test...

..., and inside closely placed drill holes in an underground space. correlation upstream oil & gas strength application mechanical property scratch depth reservoir characterization scratch probe reservoir geomechanics sample preparation estimation detournay scratch test rock strength...