Changing set points in a resonant system

Patent metadata

Field	Value
Publication number	US-11914403-B2
Application number	US-202017092692-A
Country	US
Kind code	B2
Filing date	Nov 9, 2020
Priority date	Jun 27, 2013
Publication date	Feb 27, 2024
Grant date	Feb 27, 2024

Abstract

A method for changing a set point of a system where period of a dominant resonance of the system is determined, a change profile for the set point change is processed; a time period for the set point change based on the period of the dominant resonance in order to minimize excitation of the dominant resonance is also processed; and the set point change is actioned according to the processed change profile and the time period.

First claim

The invention claimed is:

1. A control system for changing a set point of a system in a borehole, comprising:
a processor configured to:
determine the period of a dominant resonance of the system;
process a change profile for the set point change comprising at least one sensed property;
determine a time period for the set point change comprising the period of the dominant resonance; and
a controller configured to perform the set point change according to the change profile and the time period.

2. The control system of claim 1 , further comprising one or more sensors to sense properties of the system or the borehole or both, wherein the determination of the period of the dominant resonance of the system or the processing of the change profile or both are based on one or more of the sensed properties of the system or the borehole or both.

3. The system of claim 1 , wherein the system comprises a rig or a tool.

4. The system of claim 1 , wherein the system comprises a managed pressure drilling system.

5. The control system of claim 1 , wherein the system comprises a drilling system.

6. The control system of claim 1 , wherein the system comprises an automated system in a borehole.

7. The system of claim 1 , wherein the time period is a multiple of the period of the dominant resonance.

8. The system of claim 1 , wherein the change profile is a linear change profile, and the time period is an integer multiple of the period of the dominant resonance.

9. The system of claim 1 , wherein the time derivative of the change profile has a half-period of a sine-wave, and the time period is an integer-plus-a-half multiple of the period of the dominant resonance.

10. The system of claim 1 , wherein the change profile is symmetric about a mid-time of a change.

11. The system of claim 1 , wherein the determination of the time period for the set point change is performed by taking the Fourier transform of the time derivative of the change profile.

12. The system of claim 1 , wherein the system comprises a drillstring.

13. The system of claim 1 , wherein the system comprises a wireline.

14. The system of claim 1 , wherein the system comprises an electro-submersible pump.

Assignees

• Schlumberger Technology Corp

Inventors

• Jeffryes Benjamin Peter
• Cook John
• Gahlings Steven Antony

Classifications

• G05D19/02 Primary

  characterised by the use of electric means · CPC title

• E21B43/128

  Adaptation of pump systems with down-hole electric drives · CPC title

• E21B44/00 Primary

  Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions · CPC title

• E21B47/00

  Survey of boreholes or wells (monitoring pressure or flow of drilling fluid E21B21/08) · CPC title

• E21B47/007

  Measuring stresses in a pipe string or casing (for locating blocked portions of pipes E21B47/09) · CPC title