Theoretical aspects for the design software of drive system in the drilling technology

Abstract

There is defined the function of expence optimization of drilling in a ground massif in the work. It is possible to rewrite the cost optimization formula of Waller and Rowsell to the formula()CBRTHkAERPmA=++ ,whereC - costs related to the current meter of the drilling, [Sk.m-1],B - additional drilling costs, [Sk],R - direct drilling costs recalculated on the time unit, [Sk.h-1],Tm - time loss recalculated on the length unit, [h.m-1],H - the depth in which the process is realized in the case of the deep drilling, [m],A - rockmass abrasivity, [mm.m-1],E - specific energy of cutt-off, [J.m-3],kA - constant,P - penetration rate, [m.h-1],where P is formulated in the form()()PLPeokELLE= ,wherePo - starting penetration rate with unworn tool, [m.h-1],L - currently drilled depth or the length with the newly mounted tool until its worn out, [m],kE - constant.Using this formulas it is possible to formulate the criterion to control the drilling process in ground from the viewpoint of minimizing the expences of drilling for the linear meter in the formLBRTHRkkPEoptmEL2=−+max ,whereLopt - the optimum drilled length with the tool from the point of the criteria of the minimum costs for the current drill meter under the drilling parameters,(P/E)max - criterion for the design software of drive automat in the drilling technology,kL - constant.

Keywords

• costs of drilling
• minimal costs per meter
• monitoring of drilling
• penetration rate
• specific energy