drilling

Aim. Analysis of used bits revealed the effect when the tungsten carbide insert cutter was scrolling around its axis. Therefore, the task was to study the causes of this phenomenon. Hardness was measured followed by setting the hardness distribution gradient in the section of the hole, in order to evaluate the strength parameters of steel in the zone of the hole. Method. Applying a well-tested method, namely the method of successive approximations, we determined the estimate of the standard deviation and the evaluation criterion.

The paper proposes one of the ways to set up an optimal mode of drilling oil and gas boreholes. The existing methods of control of the penetration rate and drill bit state were analysed. It was shown that due to incomplete and often distorted information it is difficult to perform control of the drilling process based on the mathematical model of the drill bit penetration, the solution of which is time dependencies of the penetration rate.