Multiple input scaling autodriller
AssigneeOmron Oilfield & Marine, Inc.
InventorsFergus Hopwood, Phillip G. Martin, Richard Lewis
Life of this patent
Estimating the term…
Abstract
A wellbore drilling system includes a weight on bit controller configured to generate a normalized weight on bit output, a drilling torque controller configured to generate a normalized toque on bit output, and a differential pressure controller configured to generate a normalized differential pressure output. The system further includes a rate of penetration controller that is configured to multiply a rate of penetration setpoint with the normalized weight on bit output, the normalized torque on bit output, and the normalized differential pressure output to generate a rate of penetration output.
Claims17
A drillstring release rate control that comprises:
- a weight on bit (WOB) controller that generates a normalized WOB output based at least in part on a difference between a WOB setpoint and a WOB measurement;
- a drilling torque controller that generates a normalized torque on bit (TOB) output based at least in part on a difference between a TOB setpoint and a TOB measurement;
- a differential pressure (DeltaP) controller that generates a normalized DeltaP output based at least in part on a difference between a DeltaP setpoint and a DeltaP measurement;
- and
- a rate of penetration (ROP) controller that determines a release rate that is a combination of at least the normalized WOB output, the normalized TOB output, the normalized DeltaP output, and a ROP setpoint.
A drilling system that comprises:
- drillstring release rate control that includes:
- a plurality of controllers that each convert a difference between a setpoint and a measured input into a normalized output;
- and
- a rate of penetration (ROP) controller that determines a release rate that is a combination of the normalized outputs and a ROP setpoint;
- and
- a mechanism that regulates a traveling block velocity based on said release rate.
A method that comprises:
- drilling a borehole with a drillstring suspended from a traveling block;
- obtaining a plurality of normalized outputs from differences between a corresponding plurality of measurement signals and a corresponding plurality of setpoints;
- determining a release rate from a combination of at least the normalized outputs and a rate of penetration setpoint;
- and
- controlling a traveling block velocity in accordance with said release rate.
Dependencies are inferred from the claim text.