Selecting Tricone Drill Bit with the three structures of shift axis, overtop, and compound cone, along with milled teeth or inserts with high, wide, thin, and large tooth tip angles, is advised for soft formations. The above three structural characteristics of the chosen Tricone Drill Bit should be reduced in accordance with the hardness of the rock, the teeth should also be short, narrow, and dense, and the tooth tip angle should also be decreased in accordance with this.
(1) Tricone Drill Bit with the three structures of shift axis, over-top, and compound cone should be used for soft forms. Milled teeth or inserts with high, broad, thin, and big tooth tip angles should be used as the teeth. The above three structural characteristics of the chosen Tricone Drill Bit should be lowered in accordance with the hardness of the rock, the teeth should also be short, thin, and dense, and the tooth tip angle should also be decreased in accordance with this.
(2) Use an insert Tricone Drill Bit with a gauge tooth when drilling abrasive formations. The following drill should make use of an insert drill with gauge teeth when it is discovered that the outer teeth of the prior drill are rounded and the middle teeth are less worn.
(3) A Tricone Rock Drill Bit with no shaft shift or just a limited degree of shaft shift, no gauge teeth, and numerous short teeth should be chosen for drilling in readily inclined rocks; In order to raise the ROP at a lower WOB, the formation should be a little Tricone Rock Drill Bit softer than the formation being drilled.
(4) Be careful when selecting a Tricone Rock Drill Bit with cemented carbide teeth: utilize a wedge-shaped tooth bit after the majority of the shale has been drilled; Use a parabolic or double-conical tooth bit for drilling in a diamond-limestone deposit and high-density drilling fluids. Use a bit with a large offset value when the density of the drilling fluid or the shale composition in the chosen formation increases; in diamond limestone or sandstone formations, use a bit with a small offset value. drill sharpening Use a ball-tooth drill without a shaft shift to cut quartz, flint, and limestone.
