Fluid Hammer Increases PDC Performance through Axial and Torsional Energy at the Bit

Abstract

Abstract Increasing drilling efficiency and performance are key factors for determining whether or not a new play is viable for drilling. Although several factors affect drilling cost, one key element in reducing cost is reducing drilling time by increasing the rate of penetration. This is accomplished by changing the way a drill bit interacts with the formation and analyzing different ways to overcome the factors that limit drilling performance. New performance drilling tool designs are brining conventional mud motors into the next generation with performance driven technology. This technology features the latest generation of performance elastomers with a new energy distribution system which enhances the rock failing properties of the attached bit. This is achieved by applying both axial and torsional loading to the bit at the same time. Conventional motors are limited by torsional loading which correlates to the differential pressure a power section can hold before it stalls. The interaction between the bit and the rock correlates to this stall pressure of the power section used. The new performance technology takes this torsional load and merges it with the axial load created by the weight of the drill string, which it then oscillates axially. The combination of axial and torsional oscillating movement amplifies the cutting interaction of the bit to help overcome the compressive strength of the formation being drilled. Due to the unique design and different available configurations, this technology is compatible with both roller cone and fixed cutter bit designs. This design allows for constant contact between the bit and formation, reducing any bit bounce or stick slip which could reduce drilling efficiency. Along with increasing bit performance it also helps reduce weight stacking by reducing friction caused from interaction between the BHA and formation. This has proven to help with weight transfer to the bit and to reduce motor stalling, thereby improving directional control.