Experimental research on characteristics of hole reaming and side cutting of one-cone bits

The hole reaming and side cutting characteristics of offset one-cone bit and conventional one-cone bit were investigated on simulated drilling experimental equipment.The borehole diameter was a little larger than the bit diameter due to side force.However,the reaming effect was not very apparent,whether drilling with an offset or conventional one-cone bit.The side cutting displacement increased gradually with increasing depth of drilling and side force.The side cutting displacement of offset one-cone bits was larger than that of conventional ones under the same conditions of weight-on-bit(WOB),rotary speed,side force and borehole depth.