July 11, 2021

Rock Drillability. George Exadaktylos. Professor of Rock Mechanics & Mining Engineering, School of Mineral Resources. Engineering, Technical University. The purpose of this paper is to provide a proper, practical and convenient drilling rate index (DRI) prediction model based on rock material. Quantifying the rock microfabric is one of the most important research interests and challenges in the field of rock drilling and excavation.

Author: Dait Fenrishicage
Country: Honduras
Language: English (Spanish)
Genre: History
Published (Last): 17 January 2017
Pages: 347
PDF File Size: 11.54 Mb
ePub File Size: 20.29 Mb
ISBN: 422-3-27596-757-6
Downloads: 96853
Price: Free* [*Free Regsitration Required]
Uploader: Nanris

Proceedings of an international conference Diverless and Deepwater Techology: Proceedings of an international conference Subsea Rockx and Data Acquisition ‘ Sheriff’s Encyclopedic Dictionary of Applied Geophysics, fourth edition. Log in to your subscription Username.

These are compiled and normalized in a scale of 1 to 8; value of 1 represents very soft rock and a value of 8 represents hard rock, ideally. Peer reviewed only Published between: It also indicates a co-efficient of energy transfer roks the extent of vibration in an efficient drilling process.

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. Further, it has been found that these estimates do not often provide the full picture of drillability of rocks, which have complicated drillabillty and microstructures that go through complex digenesis process. Advanced search Show search help.


Log in to your subscription

Further, this gives an excellent tool to optimize the bit drillabilith drilling process for a given rock formation while depicting its physico-mechanical and micro-structural properties as a signature plot. The real rock is in between depending upon the rock type.

Publishers Content Coverage Privacy. About us Contact us Driklability Terms of use. Rock Mechanics Symposium and 5th U. Drillability of rocks, by an expert, is defined by a large number of parameters [6,7,8,9,10,11,12,13,14,15,16], which are not well understood or communicated to the end user. Abstract Drillability of a rock is often expressed in terms of a large number of parameters; however, the industry hardly uses any. Quite often these are not well understood or communicated to the end users.

The drillability is assumed to be indicative of unconfined compressive strength UCS at atmospheric drilling [1,2] or confined rcks strength CCS together with a factor of efficiency [3,4,5].

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. As a compromise, the present work describes drillability in terms of eight simple physical, mechanical, and micro-structural properties, which are displayed visually and are available from either log data or from laboratory core testing.


Definition of drillability – glossary

Proceedings of an International Conference Submersible Technology: Proceedings of an international conference Oceanology: The relevant rock properties are or, porosity, compressional and shear wave velocities, unconfined compressive strength, Mohr friction angle, mineralogy, and grain sizes.

American Rock Mechanics Association Downloads 1 in the last 30 days 1, since Show more detail. As a result, the industry uses hardly any.

Posted in Business