Publikasjoner og ansvarsområder
A Phenomenological Model of Percussive Drilling: Review of Experimental Evidence
In this paper, we review and analyze published experimental findings in light of the hypothesis that the dependence of bit-rock interface (BRI) pseudo-stiffness on the weight-on-bit (WOB) is the key factor behind the existence of a sweet spot in percussive drilling, i.e., there is an optimal WOB...
Influence of weight-on-bit on percussive drilling performance
A phenomenological model for percussive drilling systems is proposed in this paper to explain the experimentally demonstrated existence of an optimal weight-on-bit (WOB), for which the rate of penetration (ROP) is maximized. Several hypotheses have been previously proposed to explain this universal...
Adaptation of Laboratory tests for the assessment of wear resistance of drill-bit inserts for rotarypercussive drilling of hard rocks
Unscented Kalman filter based state and parameter estimation in percussive drilling systems
Down-The-Hole (DTH) percussion tool is recognized for its high average rate of penetration (ROP), when drilling medium hard to very hard rock formations. This ROP which depends on the bit-rock contact conditions at the well bottom to efficiently transfer the impact energy to an intact rock can be...
A dynamic model of the drilling action of percussive tools
A phenomenological model is proposed to explain the existence of sweet spot in the relationship between the rate of penetration (ROP) and the weight-on-bit (WOB), i.e., the existence of an optimal WOB for which the ROP is maximized. The reasons that have been previously proposed to explain the...