Mechanical analysis of rock breaking by an abrasive water jet bit
Abstract：The boss at the hole bottom is a key factor that limits drilling speed. The boss was eliminated and drilling speed increased by using an abrasive water jet bit to drill in hard rock. Force analysis shows that the mode of rock breaking during hard rock drilling by a three wings bit is by grinding. However, the mode is by cutting when an abrasive water jet is used. Hard rock drilling experiments showed that the drilling speed was 1. 57 times faster using an improved bit with reduced blade distance of the leading bit compared to the original three wings bit. At the same time torque increased by 11.3%, and the observed wear is serious. The drill- ing speed using an abrasive water jet bit is 3.72 times faster than the original three wings bit and the torque is reduced by 34.0% with no evident wear. Theoretical analysis and experimen- tal results showed that low drilling speeds and serious wear encountered while drilling in hard rock can be completely resolved by using an abrasive water jet bit.
Keywords：bitrock broken modedrilling speedtorque
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 531-535 )