RATE OF PERFORMANCE (ROP) CONTROL WHILE WELL DRILLING
It is shown that in linear models of time components of bit run speed both generally accepted criteria of optimum time of a drill bit operation on the bottom hole provide only unified control of rate of performance (ROP) with account of economic factors. Adequacy of linear models estimating time required for lifting operations and lengthening of drill pipes is experimentally confirmed. Simple and efficient recursive algorithm is developed to control current bit penetration rate depending on on-line drilling showings and normative characteristics. Specific examples of control algorithm application based on real data for the most typical situations of bits' operation are considered.