Drilling Control System Feedback Loop for Bit Wear and Penetration Rate
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Solution Overview
Problem
Existing methods for drilling blast holes in mining and quarrying operations face challenges in achieving consistent quality due to difficulties in conforming to desired specifications, with issues such as cave-ins and inefficiencies in penetration rates and drill bit wear, leading to suboptimal drilling efficiency and speed.
Innovation Solution
A system and method that monitors and adjusts drilling parameters in real-time using a graphical control system to ensure compliance with predetermined specifications, incorporating feedback loops for rotation speed, weight-on-bit, and fluid injection to optimize drilling efficiency and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the drilling speed is increased to improve productivity, then the penetration rate increases, but the drill bit wear increases and drilling efficiency decreases
Solution Approach 1:
The system employs a feedback control mechanism that continuously monitors the penetration rate and adjusts the feed force applied to the drill bit in real-time. This closed-loop control ensures the drilling operation maintains the optimal depth of cut, preventing excessive bit wear while maximizing penetration rate. The feedback loop compares actual penetration rate with target penetration rate and dynamically adjusts drilling parameters to resolve the contradiction between drilling speed and bit wear.
Solution Approach 2:
The system dynamically changes drilling parameters including feed force, rotation speed, and depth of cut based on real-time monitoring of penetration rate and bit wear indicators. By adjusting these parameters within optimal ranges, the system maintains high productivity while preventing excessive bit wear. The parameter changes are coordinated to ensure the ratio of penetration rate per drill bit revolution remains optimal throughout the drilling operation.
2Speed
If the feed force is increased to improve penetration rate, then the drilling speed increases, but the drill bit wear increases and consumable life decreases
Solution Approach 1:
The feedback control system monitors penetration rate and bit wear indicators, then adjusts feed force dynamically to maintain optimal drilling conditions. When bit wear increases, the system automatically reduces feed force to extend bit life while maintaining acceptable penetration rates. This continuous adjustment resolves the contradiction between achieving high penetration rates and extending consumable life.
Solution Approach 2:
The system transitions from static feed force application to dynamic adjustment of feed force based on real-time drilling conditions. The feed force is continuously modified to maintain the optimal depth of cut ratio, allowing the system to adapt to changing bit wear and rock properties. This dynamic approach enables maintaining high penetration rates while extending bit life through optimized force application.
3Productivity
If multiple blast holes are drilled rapidly to improve productivity, then the drilling speed increases, but the hole quality compliance decreases due to cave-ins and specification deviations
Solution Approach 1:
The system employs comprehensive feedback monitoring of drilling parameters including depth, location, and hole stability. This real-time data allows the system to detect and correct deviations from specification, preventing cave-ins and ensuring compliance even during rapid drilling operations. The feedback mechanism enables maintaining high productivity while ensuring each hole meets quality specifications through continuous parameter verification and adjustment.
Data Source
AI summary
A system and method for drilling a borehole using a drilling rig having a rotary drill bit includes monitoring one or more drilling parameters; determining whether the one or more monitored drilling parameters are within predetermined specifications for one or more of the monitored drill parameters; and, executing an exception control procedure for control of a drilling parameter. The exception control procedure receives an input sensor value associated with a drilling parameter and applies feedback control to establish a scaled error value that is used to compute a setting value for the drilling parameter. The drilling parameters controlled may include the rotation speed of the drill bit, the feed rate of the drill bit, the weight-on-bit, or rotation torque during retraction of the drill bit. A computer-readable database of specifications of drill bits may be provided as a part of the system.