Experimental method for measuring the forces acting on the cutters of the rolling cutter bit

UDK: УДК 622.24.051.55

Key words: bearing, drilling, rolling cutter bit, rolling cutter, rolling cutting structure, weight on bit

Authors: V.A. Pyalchenkov, D.V. Pyalchenkov, V.V. Dolgushin, O.F. Danilov (Tyumen Industrial University, RF, Tyumen), Ya.M. Kurbanov (ZapSibBurNIPI Branch of SIC Nedra JSC, RF, Tyumen)

To assess the reliability and durability of separate elements of drill bits cutting structure and rolling cutter support nodes as well as the whole bit rolling cutter, it is necessary to know the force values acting on the cutting structure elements of the rolling cutter bit during its interaction with the down hole. Analysis of existing experimental investigation methods for weight distribution on the rolling cutting structure elements indicates the insufficient knowledge of this issue. The paper presents the method of direct measuring of these forces. A radically new measuring device was developed and manufactured. It allows to measure the force values acting on each tooth of each rolling cutter in cooperation with non-destructive down hole, consisting of concentric steel rings, divided into two sectors, a working one in which the measurement is made, and a non-working one. Measurement is performed using the strain-gage sensors glued on special beams. The sensor signals are amplified, recorded, and processed using the special equipment. For implementation of this method a stand is made, intended for the bit rolling under a load along the bottom of the measuring device. The stand allows test performing of various standard bit size, changing the axial load on the bit from 0 to 200 kN and a bit angular speed from 0.16 to 11.34 s^-1, these values correspond to real conditions of rotary drilling. The given stand allows operatively and cost-effectively bits testing with different standard sizes in order to optimize the cutting structure design and rolling cutter bit bearings, including those at their design stage.
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