--> The Rock Breaking Mechanism of Ultrasonic High Frequency Rotary-Percussive Drilling Technology
[First Hit]

Petroleum Drilling Techniques, Issue 4, 2018

Datapages, Inc.Print this page

The Rock Breaking Mechanism of Ultrasonic High Previous HitFrequencyNext Hit Rotary-Percussive Drilling Technology

Abstract

The ROP of the traditional drilling in deep hard formations is very low, which seriously affects the process of exploration and development of deep and ultra-deep oilfields. To solve this problem, ultrasonic high Previous HitfrequencyNext Hit rotary-percussive drilling technology was proposed, and the ultrasonic vibration pup joint for realizing the ultrasonic high Previous HitfrequencyNext Hit rotary-percussive drilling was designed by combining the ultrasonic rock breaking technology with the traditional rotary rock breaking technology. Employing geomechanical theories, the rock breaking mechanism of ultrasonic high Previous HitfrequencyNext Hit rotary-percussive drilling was analyzed and a high Previous HitfrequencyNext Hit percussive drilling model was established. Through dimensionless numerical analysis of the high-Previous HitfrequencyNext Hit percussive drilling mathematical model, the three stages of high-Previous HitfrequencyNext Hit percussive drilling were studied, and the influence of key parameters, including weight on bit, Previous HitfrequencyNext Hit and amplitude, on rock breaking efficiency were analyzed in detail. It was observed that the rock breaking efficiency increased as the weight on bit and amplitude increased, and there was an optimal vibration Previous HitfrequencyNext Hit, resulting in the highest rock breaking efficiency. The results showed that the ultrasonic high Previous HitfrequencyTop rotary-percussive drilling technology improved the ROP in deep hard formations by accelerating the fatigue breakdown of hard rocks, reducing the bit stick-slip vibrations and reasonably utilizing resonance energy.