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Floating Cushion Shock Sub Top Spindle Sub Top Thread Saver Sub Drill String Components Drill Pipe Lifting Bail TEAMALLOY TM Drill Pipe Carousel Pot/Cup TEAMALLOY TM Starter Drill Pipe CENTEROLL TM Deck Bushing Deck Bushing DURALLOY TM Bit Sub EZ-DRILL TM Roller Stabilizer Bit Lifting Bail Secoroc Tricone Drill Bit Bit Breaker Basket Pit Viper Series
In rotary drilling, the selection of each purpose suited drill string component is vital to achieve accurate holes and operational efficiency – parameters which affect operational costs. When developing a rotary drilling system, most of the attention is given to the drill rig – the capital equipment that requires significant investment and hence a planned payback. The second priority in the system tends to be choice of rotary tricone drill bit. However, to utilize the full power and capacity of the rig and the bit and at the same time increase service life and productivity, serious consideration should also be given to each component within the drill string. The optimal drill string includes a shock absorber at the top, a rotary deck bushing to centralize the drill string as it passes through the deck of the drill rig, strong and straight drill pipes and finally a hole stabilizing roller stabilizer or bit sub-adaptor to optimize the performance. Giving the necessary attention to every part of the drill string will lead to the lowest total drill operating costs. The primary purpose of the drill string is to transmit the rotational torque and weight from the rotary head power source to the rock breaking drill bit. As in every rock drilling method, the power must be transmitted as efficiently as possible, and return as few vibrations as possible, as these cause unnecessary wear on the drill rig and reduces penetration rates. When selecting components for the drill string, attention must be given to the different roles of the support tools in the string. With the Secoroc rotary drill string the aim is to always: • Absorb damaging vibrations from the bit. • Reduce wear on the drill rig’s rotary drive, mast and power train. • Improve transmission energy from the rotary head to the drill bit. With the Secoroc rotary drill string the aim is to always: • Centralize drill string within the hole, ensuring axial alignment top to bottom. • Longer and more effective bit life. • Compliment performance potential of the drill rig and drill bit. • Reduce friction as the drill string passes through the drill rig deck. With the Secoroc rotary drill string the aim is to always: • Stabilize the hole wall to prevent hole caving in softer formations. • Increase penetration rates, lowering total drilling costs. • Achieve blasthole accuracy for improved blasting efficiency. • Improve the end result – the correct fragmentation of the blasted rock for lower downstream operating costs!
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