Control systems and methods to enable autonomous drilling
| DWPI Title: Method for controlling drilling parameters based on drilling medium characteristics involves applying a predetermined force setpoint to a first controller and the predetermined rotary speed is applied to a second controller |
| Abstract: A system or method for drilling includes autonomously controlling a rotary or percussive drilling process as it transitions through multiple materials with very different dynamics. The method determines a drilling medium based on real-time measurements and comparison to prior drilling data, and identifies the material type, drilling region, and approximately optimal setpoint based on data from at least one operating condition. The controller uses these setpoints initially to execute an optimal search to maximize performance by minimizing mechanical specific energy. |
| Use: Method for controlling drilling parameters based on drilling medium characteristics. |
| Advantage: The method had reliable parameters for achieving high rates of penetration and avoids potentially deleterious effects introduced during inefficient drilling and eliminates effects of elasticity in the drill rig. |
| Novelty: The method involves applying a predetermined force setpoint to a first controller. The predetermined rotary speed is applied to a second controller. The first controller output and a second controller output is applied to a drilling process module. Multiple outcome parameters (16) of the drilling process module are measured. The drilling process inputs are received and process the outcome parameters. Multiple rock parameters associated with a rock type is estimated. The adjusted drilling parameters setpoints are approaching stall conditions having to monitor the torque. The torque that exceeds a predetermined torque is determined. The target weight on the bit is reduced by an amount determined by a barrier function configured to respond more rapidly to material changes. |
| Filed: 1/25/2018 |
| Application Number: US15880109A |
| Tech ID: SD 14245.0 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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