Geological Boundary Drilling Using Real-Time MWD End-Point Control
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Solution Overview
Problem
In mining operations, particularly in open-cut mines, boreholes often penetrate valuable mineral seams during overburden removal, leading to significant loss of valuable material when explosives are detonated, as existing methods lack precision in drilling to geological boundaries.
Innovation Solution
A method and system that utilize measurement-while-drilling (MWD) data to sense borehole parameters and update a geological model in real time, allowing for precise control of a drill to reach a defined position relative to a geological boundary, such as a stratigraphic band, thereby minimizing penetration of the seam material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If standard drilling procedure is used to remove overburden, then overburden removal is achieved, but valuable seam material is lost due to penetration during blasting
Solution Approach 1:
The system performs preliminary actions by drilling pilot holes to map the geological boundary before drilling production holes. The geological model is updated in real-time during pilot hole drilling to predict boundary locations, allowing production holes to be precisely targeted to stop just above the seam material, thus preventing premature penetration and material loss.
Solution Approach 2:
The system continuously senses borehole parameters (weight on bit, rate of penetration, rotation rate, bit torque, temperature, depth, XYZ translation, gas pressure, spectral scan data) and feeds this information back to update the geological model in real-time. This feedback loop enables dynamic adjustment of drilling parameters and automatic termination when the predetermined position relative to the geological boundary is reached, minimizing seam material penetration.
2Measurement precision
If every fifth borehole is drilled into the seam to map the boundary, then boundary location information is obtained, but the remaining boreholes still penetrate the seam causing material loss
Solution Approach 1:
The system replaces traditional mechanical boundary mapping methods with a computer-based geological model that integrates real-time sensed parameters. Instead of relying solely on physical pilot holes, the system uses algorithms to predict boundary locations and automatically control drill termination, providing continuous boundary location accuracy for all boreholes rather than just every fifth hole.
Solution Approach 2:
The system changes drilling parameters (weight on bit, rate of penetration, rotation rate, bit torque) and monitors their variations to detect geological boundary approaches. By analyzing changes in these parameters along with depth and position data, the system accurately locates the boundary and adjusts the end point for each borehole to prevent seam penetration.
3Reliability
If operator-controlled drilling is used with visual detection of seam penetration, then seam penetration can be detected, but precision in controlling the end point is insufficient
Solution Approach 1:
The system enables the drill to serve itself by automatically determining its own end point based on real-time sensing data and the updated geological model. The controller autonomously controls drilling parameters and termination without relying on operator visual detection, providing precise end point control while maintaining reliable seam penetration detection through multiple sensed parameters.
4Measurement precision
If real-time updating of geological model is implemented, then boundary location accuracy is improved, but system complexity increases
Solution Approach 1:
The system achieves multi-functionality by using a single integrated controller that performs multiple tasks: sensing borehole parameters, updating the geological model, predicting boundary locations, determining end points, and controlling drilling operations. This universal controller reduces the need for separate specialized systems while maintaining high boundary location accuracy through real-time model updates.
Data Source
AI summary
A system for mining material in a seam under an overburden layer using a geological model map of a geological formation, including a desired drilling end point at a predefined position relative to a geological boundary between the overburden layer and seam. A drill controller controls operation of a drill drilling a blast hole. A sensor pack senses, while drilling the blast hole, blast hole drilling operation parameters; and feeds the sensed parameters in real time to the drill controller. A data storage module stores a geological model of the geological formation and sensed parameters data. A processor module generates a geological model map including the desired drilling end point and locates the drill bit position relative to the geological boundary and such end point. The drill controller drills to the desired drilling end point and causes the drill to stop drilling upon reaching such end point.