Downhole Drill-String Sensor Modules for Accurate Parameter Measurement
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Solution Overview
Problem
Current drilling parameter measurement techniques for mineral exploration are inaccurate due to remote monitoring, leading to uncertainties and inefficiencies, and existing systems from the oil and gas industry are not adaptable or cost-effective for mineral exploration.
Innovation Solution
A compact, cost-effective apparatus with modules mounted within the drill string near and distal to the drill bit, equipped with sensors to measure drilling parameters such as WOB, torque, and vibrations, providing accurate data transmission and analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If drilling parameters are measured at the surface using remote monitoring, then the monitoring distance is extended and operator safety is improved, but measurement accuracy deteriorates due to estimation errors and assumptions
Solution Approach 1:
The measurement system is segmented into multiple independent modules that can be distributed along the drill string. Each module contains its own sensors and processing capabilities, allowing measurements to be taken at multiple locations (proximal and distal to the bit) rather than relying on a single remote measurement point, thereby improving accuracy while maintaining operator safety
Solution Approach 2:
A telemetry system acts as an intermediary to transmit measurement data from the downhole modules through the drilling fluid annulus to the surface. This intermediary mechanism enables accurate near-bit measurements to be communicated to operators without requiring them to be physically present at the bit location, thus maintaining both safety and measurement precision
2Measurement precision
If measurement modules are placed proximal to the drill bit, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
Multiple measurement functions (torque, weight on bit, vibrations, temperature, fluid flow) are merged into integrated modules that can be mounted on the drill string. This consolidation reduces the overall system complexity compared to having separate measurement systems for each parameter, while still achieving high measurement accuracy proximal to the bit
Solution Approach 2:
The measurement modules are designed with multi-functionality, capable of measuring multiple drilling parameters simultaneously using a single module placement. This universal design reduces device complexity by eliminating the need for multiple specialized measurement systems, while maintaining comprehensive monitoring capability near the bit
3Measurement precision
If oil and gas industry measurement systems are adapted for mineral exploration, then measurement capability is improved, but cost and adaptability deteriorate due to system incompatibility
Solution Approach 1:
The measurement system parameters (measurement ranges, sensor specifications, module dimensions) are specifically adjusted for mineral exploration applications rather than oil and gas. The modules are designed to accommodate the smaller drill string diameters and different drilling conditions in mineral exploration, making the system adaptable and compatible with existing mineral exploration equipment while maintaining measurement capability
Data Source
AI summary
Apparatus (100) for measuring drilling parameters of a down-the-hole drilling operation for mineral exploration includes a module 10.1 mounted in-line with a drill string (110) and proximate to a drill bit (120). The drill string (110) is rotated and progressed down the hole. The module (10) has sensors for sensing conditions. The apparatus (100) measures drilling parameters based on the sensed conditions. The measured data is logged in the module (10) and then transmitted to a computer for a drilling operator's use. The drilling operator monitors progress and optimises performance of the drilling operation based on the measured data. Measurement of drilling parameters based on sensed data proximate to the drill bit enables accurate determination of actual WOB, torque and RPM fluctuations, axial vibration, radial vibration, temperature, RPM. A second module 10.2 is mounted in-line with the same drill string (110) but away from the drill bit (120). The second module 10.2 measures the same drilling parameters as the module 10.1 proximate to the drill bit (120). The driller is provided with the data recorded by the second module 10.2 to judge the performance of the drilling operation. Comparing drilling parameters based on sensed data proximate to the drill bit and distal to the drill bit enables accurate determination of vertical drag/resistance of the drill string (110) within the hole, rotational resistance of the drill string (110), degree of wind-up of the drill string (110) and presence of stick-slip conditions at lower end of the drill string (110).