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.
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American Rock Mechanics Association Downloads 1 in the last 30 days 1, since Show more detail. 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.
Proceedings of an international conference Oceanology: Further, it has been found that these estimates do not often provide the full picture of drillability of rocks, which have complicated mineralogy and microstructures that go through complex digenesis process. Drillaiblity search Show search help.
These rock properties are typically estimated using electric log data [17,18,19,20,21] using drillxbility known calibration or mea in the laboratory in absence of logs. 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.
Proceedings of an international conference Diverless and Deepwater Techology: 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.
Definition of drillability – glossary
As a compromise, the present work describes drillability in terms of eight simple physical, mechanical, and micro-structural properties, which are focks visually and are available from either log data or from laboratory core testing. Abstract Drillability of a rock is often expressed in terms of a large number of parameters; however, the industry hardly uses any.
Sheriff’s Encyclopedic Dictionary of Applied Geophysics, fourth edition. It also indicates a co-efficient drollability energy transfer and the extent of vibration in an efficient drilling process.
As a result, the industry uses hardly any. Rock Mechanics Symposium and 5th U. Proceedings of an international conference Subsea Controls and Data Acquisition ‘ Log in to your subscription Username. Peer reviewed only Published between: Publishers Content Coverage Privacy.
Definition of drillability
Further, this gives an excellent tool to optimize the bit and drilling process for a given rock formation while depicting its physico-mechanical and micro-structural properties as a signature plot. The drillability is assumed to be indicative of unconfined compressive strength UCS at atmospheric drilling [1,2] or confined compressive strength CCS together with a factor of efficiency [3,4,5].
Quite often these are not well understood or communicated to the end rocsk.