Scholarly record
MONITORING DRILLING BIT PARAMETERS ALLOWS OPTIMIZATION OF DRILLING RATES
Abstract
Drilling for mineral resources can be one of the most expensive processes in the exploration and production. Hence, drilling industry has been striving since its inception for developing drilling techniques which allow for fast drilling rates but ensuring the safety of the well and of the workers. Parameters affecting the drilling process can be cast in two major categories, rig and bit related parameters and formation parameters. The first category includes weight on bit, torque, rotational speed, and hydraulic parameters like flow rate, density and rheology of the drilling fluid. The second category includes local stresses, rock compaction, mineralogy, abrasivity of formation, formation fluids. The drilling parameters can be controlled while formation parameters have to be dealt with. To achieve faster drilling rates, drilling industry has developed and uses a multitude of sensors which monitor the above parameters while at the same time allow for estimation of formation parameters. This information must then be analyzed, either in-situ or post-drilling for the design of new wells and appropriate software packages have been developed which perform these tasks to a certain extend but has been accepted widely, maybe because of the great complexity of the drilling process. In this paper we review such available packages and address the issues of the capability of a particular software package, Payzone, to be used and tuned, with monitored drilling data, so that one can design future wells using information provided from an existing well. Bibliographic drilling data are used from various drilling wells, the data monitoring is analyzed with the view of having the best available data and future designs are proposed which would allow for faster drilling rates.
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