Drillability of rocks pdf download

This action is analogous to the percussion drill and provides useful information on the drillability of rock masses. This test was originally suggested by ross goodrich, of the joy manufacturing co. Its free pdf magazines community, where dear users can familiarize and more to know about world magazines. Drillability is influenced by many factors, including machine parameters and rock properties. Soft rocks are crushed to powder by the hammer, while hard rocks are partly shattered, with most of the energy returned in the rebound. Drillability and strength characteristics of selected rocks in nigeria. Quantitative assessment of rock texture and correlation with. As of today we have 78,433,169 ebooks for you to download for free. Proceedings of an international conference subsea controls and data acquisition however, quite often, rock properties like ucs and abrasiveness have historically been used to define rock roccks and help decide bit selection, drive mechanism and drilling parameters. Homework table of characteristics of igneous, sedimentary, and metamorphic rocks answer key. Drillability of rocks, by an expert, is defined by a large number of parameters 6,7,8,9,10,11,12,14,15,16, which are not well understood or communicated to the end user. The drillability characteristics of the rocks vary from extremely low to low drillability based on the drilling rate index dri and drill bit life range from very low to extremely low life span.

Supported fileformats include epub, pdf, djvu, xps, cbt, cbz, fb2, pdb, txt, html, rtf, chm, doc, mobi and zip files. Rock drillability introduces different rocks knowledge to help the drilling workers identify different rocks in different geological conditions, and choose correct drilling rigs accordingly. Determination of drilling rate index based on rock strength using. The drillability characteristics of the rocks vary from extremely low to low drillability based on the drilling rate index. Uniaxial compressive strength, tensile strength and drilling rates of the rocks were evaluated to determine the correlation between rock drillability m3hr and. Drillability of rocks pdf new pdf download service. Pdf this study examines drillability and strength characteristics of selected rocks in nigeria.

Drillability is an important parameter in order to assess the influence that intact rock properties have on performance prediction and cost evaluations in connection with drillandblast. Finally, an investigation program is submitted, which helps to improve the estimation of rock drillability in planning future tunnel projects. However, quite often, rock properties like ucs and abrasiveness have historically been used to define rock drillability and help decide bit selection, drive mechanism and drilling parameters. University of rizona mining and geological engineering rock excavation mne 415 515. Drillability of a rock in terms of its physicomechanical. In fact, a cap rock provides low drillability, whereas a highpressured reservoir often has high porosity making it more drillable. Therefore an improoved prediction of drilling velocity and bit wear would be desireable. Keywordsrock drillability models, drill penetration rate. Correlation of blasting coefficient with drilling rate of rocks. These rock properties are typically estimated using electric log data 17,18,19,20,21 using a known calibration or mea in the laboratory in absence of logs. The results of rock strength, diamond and percussion drillability tests in eleven sandstones, marbles and igneous rocks are reported, and correlated with the. Pdf drillability is an important parameter in order to assess the influence that intact rock.