METHOD AND SYSTEM FOR TESTING A CONTROL SYSTEM FOR A MARINE PETROLEUM PROCESS PLANT

• US 20070100478A1
• Filed: 10/27/2006
• Published: 05/03/2007
• Est. Priority Date: 10/31/2005
• Status: Abandoned Application

• Current Assignee: Marine Cybernetics AS (Stiftelsen Det Norske Veritas)
• Original Assignee: Marine Cybernetics AS (Stiftelsen Det Norske Veritas)
• Inventors: Skjetne, Roger, JOHANSEN, Tor, Sorensen, Asgeir, EGELAND, Olav
• Application Number:
  US11/553,670
• Publication Number:
  US 20070100478A1
• Time in Patent Office: Days
• US Class Current: 700/45
• CPC Class Codes: G05B 19/41865 characterised by job scheduling, process planning, material flow
• CPC Class Codes: G05B 2219/23446 HIL hardware in the loop, simulates equipment to which a control module is fixed
• CPC Class Codes: G05B 2219/32356 For diagnostics
• CPC Class Codes: G05B 2219/32385 What is simulated, manufacturing process and compare results with real process
• CPC Class Codes: G05B 23/0256 injecting test signals and analyzing monitored process response, e.g. injecting the test signal while interrupting the normal operation of the monitored system; superimposing the test signal onto a control signal during normal operation of the monitored system
• CPC Class Codes: Y02P 80/10 Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
• CPC Class Codes: Y02P 90/02 Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

Abstract

A system for testing whether a control system (2) is capable of detection and handling of faults, failures or failure modes (8) in a petroleum process plant (1), said control system (2) arranged for being

• • connected with input signal lines (30) for receiving sensor and other input signals (30) from said petroleum process plant (1), and
  • connected with control signals lines (40) for transmitting control signals (4) to said petroleum process plant (1), comprising the following features
  • said control system (2) arranged for receiving simulated sensor signals or other input signals (3s) from a simulated petroleum process plant (10) over said input signal line (30),
  • said control system (2) arranged for transmitting control signals (4) to said petroleum process plant simulator (10) over said control signal line (40), The novel and inventive of the invention comprises the following features:
  • an input signal modifier (9) arranged for being connected to said input signal line (30),
  • said input signal modifier (9) arranged for modifying one or more said input signals (3) into modified input signals (13),
  • said input signal modifier (9) being arranged for transmitting one or more of said modified input signals (13) and remaining non-modified input signals (3) to said control system (2).

Claims

1. A method for testing whether a control system (2) is capable of handling faults,

failures, or failure modes (8) in a petroleum process plant (1), said control system (2) arranged for being

connected with input signal lines (30) for receiving sensor and other input signals (3r) from said petroleum process plant (1), and

connected with control signals lines (40) for transmitting control signals (4) to said petroleum process plant (1),

comprising the following steps:

a) connecting said control system (2) using said input signal line (30) for receiving simulated sensor or other input signals (3s) from a simulated petroleum process plant (10), and

b) connecting said control system (2) using said control signal line (40) for transmitting control signals (4) to said simulated petroleum process plant (10),

characterised in

c) connecting an input signal modifier (9) to said input signal line (30), said input signal modifier (9) modifying one or more of said input signals (3) for transmitting one or more modified input signals (13) and remaining non-modified input signals (3) to said control system (2).

2. The method of claim 1, connecting an output or control signal modifier (12) to said output control line (30), said output control signal modifier (12) modifying one or more of said control signals (4) to modified control signals (14) and transmitting said modified control signals (14) and remaining non-modified control signals (4) to said simulated petroleum process plant (1).

3. The method of claim 1, comprising interaction between two or more interacting petroleum plant subprocess simulators (100) within said petroleum process plant (10) simulators.

4. The method of claim 3, in which two or more of said petroleum plant subprocess simulators (100) mutually transmit simulated measurement signals (23) representing mass (T, P, momentum, density, composition or other state parameters) or energy transfer, or simulated control signals (24) (state variables, logical states like shut or open valves, or function modes) on signal lines (143, 144).

5. The method of claim 4, comprising a process signal modifier (22) modifying said simulated measurement signals (23) or said control signals (24) between said petroleum plant subprocesses simulators (100).

6. The method of claim 1, said input signal modifier (9) modifying one or more of said input signals (3) for forming one or more modified input signals (13) based on mathematical models of said plant (1).

7. The method of claim 6, said mathematical models based on physical laws including thermodynamic theory, comprising continuous variables and/or boolean variables.

8. The method of claim 1, said simulated failures and disturbances (18) input by said input signal modifier (9) being based on physical processes in said plant (1) and possible errors and disturbances on said signal transmission line (30).

9. The method claim 8, in which said simulated failures and disturbances input by said input signal modifier (9) being predefined or defined by an operator according to said operator'"'"'s desire or automatically generated or defined by a historically recorded incident.

10. The method of claim 3, integrating real petroleum plant subprocesses (100R) (such as an electrical generator or other power supply systems with an electrical load rapid transients difficultly modeled, such as FAT/CAT test within a process system being assembled, but before any fluids are contained within the system, and in which one wishes to test the appropriate action of valves, actuators, hydraulics, sensors etc etc.) in the simulation process with simulated petroleum plant subprocesses (100).

11. The method of claim 1, said modifying of input signals (3) or said output signals (4) based on failure modes, in which said failure modes being functional manifestations of failures, in which said failures being the inability of components to perform their function due to faults, in which said faults being defects in said components.

12. The method of claim 11, introducing one or more of the following signal modifications to said input signals (3) to form modified input signals (13), said failures comprising one or more of:

miscalibrated input signals,

out of range input signals,

disturbances on input signals,

replacing input signals,

interchanging input signals,

removing or missing input signals,

delayed input signals,

locked valve or locked valve signal,

stuck component or stuck component signal,

missing (oil, energy, water, . . . ) supply or signal indicating missing supply,

missing pressure or signal indicating missing pressure

redundant sensors showing conflicting measurements.

13. The method of claim 1, said control system (2) comprising two or more control subsystems (200a, 200b, . . . , 200m) controlling petroleum process plant subsystems or corresponding simulators (100a, 100b, . . . , 100n).

14. The method of claim 13, said two or more control subsystems (200) mutually connected by signal lines (230, 240) transmitting measurement signals (203) and/or control signals (204) between said control subsystems (200a, 200b, . . . ).

15. The method of claim 14, comprising connecting signal modifiers (209, 212) on said signal lines (230, 240) between said control subsystems (200a, 200b, . . . ) modifying said measurement signals (203) and/or control signals (204) running between said control subsystems (200a, 200b).

16. The method of claim 1, said petroleum plant subsystem simulators (100a, 100b, . . . , 100n) representing one or more of the following real processes:

receiving petroleum fluid under pressure from one or more wells via a production manifold

separating said petroleum fluid under pressure into liquid oil, water, gas and possibly sand,

cooling said oil,

storing said oil on tanks or exporting said oil to ships or via pipelines,

compressing said gas and/or cooling said gas

flaring off parts of said gas,

exporting said gas using pipelines or ships,

reinjecting parts of said gas,

producing electrical energy using gas turbines running electrical generators possibly controlled by power management systems.

purifying said water for dumping

reinjecting or dumping said water.

17. The method of claim 1, connecting two or more process plant control systems (2a, 2b, 2c, . . . ), each process plant control system (2a, 2b, 2c, . . . ) controlling one or more petroleum process plants (1a, 1b, 1c, . . . ) being one or more of an offshore platform process plant (1a), a subsea process plant (1b), and optionally a land petroleum process plant (1c), to an integrated operations control system (50) using input signal lines (60a, 60b, 60c . . . ) from said control system (2a, 2b, 2c, . . . ) said input signal lines (60a, 60b, 60c . . . ) respectively inputting monitoring signals (63) from plant control systems (2a, 2b, 2c, . . . ) to said integrated operations control system (50), and using control signal lines (70) for transmitting superior control signals (73) from said integrated operations system (50) to said process plant control systems (2a, 2b, 2c, . . . ).

18. The method of claim 17, arranging one or more input signal modifiers (39) on said input signal lines (60a, 60b, 60c, . . . ) between said plant control systems (2a, 2b, 2c, . . . ) and said integrated operations control system (50), said input signal modifiers (39) modifying one or more of said monitoring signals (63) and inputting said one or more modified monitoring signals (64) and remaining unmodified monitoring signals (63) into said plant control systems (2a, 2b, 2c, . . . ).

19. The method of claim 17, arranging one or more control signal modifiers (32) on said monitoring output signal lines (70a, 70b, 70c, . . . ) from said integrated operations control system (50) to said plant control systems (2a, 2b, 2c, . . . ), said monitoring output signal modifiers (39) modifying one or more of said output monitoring signals (73) into modified monitoring output signals (74) and inputting said one or more modified monitoring signals (74) and remaining unmodified monitoring output signals (73) into said plant control systems (2a, 2b, 2c, . . . ).

20. The method of claim 17, said integrated operations system (50) being remotely located, e.g. on a remote platform or on-shore.

21. The method of claim 17, said monitoring signals (63) from said control systems (2) comprising status signals, measurement signals (3) and control signals (4).

22. The method according to claim 1, setting up test scenarios for said simulators comprising initial physical and chemical conditions, input command settings, status signals, and possible sequences of one or more defects and associated failures, for training control system operators for commanding said control system (2) controlling said simulated petroleum process plant (10).

23. A system for testing whether a control system (2) is capable of detection and handling of faults, failures or failure modes (8) in a petroleum process plant (1), said control system (2) arranged for being

connected with input signal lines (30) for receiving sensor and other input signals (30) from said petroleum process plant (1), and

connected with control signals lines (40) for transmitting control signals (4) to said petroleum process plant (1),

comprising the following features

said control system (2) arranged for receiving simulated sensor signals or other input signals (3s) from a simulated petroleum process plant (10) over said input signal line (30),

said control system (2) arranged for transmitting control signals (4) to said petroleum process plant simulator (10) over said control signal line (40), characterised by

an input signal modifier (9) arranged for being connected to said input signal line (30),

said input signal modifier (9) arranged for modifying one or more said input signals (3) into modified input signals (13),

said input signal modifier (9) being arranged for transmitting one or more of said modified input signals (13) and remaining non-modified input signals (3) to said control system (2).

24. The system according to claim 23, said input signal lines (30) and said control signal lines (40) being one or more of fixed signal lines such as Ethernet or RS442, RS232, analogue lines, digital lines, optical lines, or wireless communication lines, and in which the signals are transmitted according to one or more communication protocols such as Field bus protocols, CAN-bus protocols, Field bus foundation protocols, proprietary bus protocols, Bluetooth protocols.

25. The system according to claim 23, comprising an output signal modifier (12) arranged for being connected to said output control line (30), in which said output signal modifier (12) is arranged for modifying one or more of said control signals (4) to modified control signals (14), and is further arranged for transmitting said modified control signals and remaining non-modified control signals (3) to said simulated petroleum process plant (10).

26. The system according to claim 23, said control system (2) comprising one or more safety systems (20) arranged for commanding shutting down of the simulated petroleum process plant (10).

27. The system according to claim 23, said simulated petroleum process plant (10) comprising two or more interacting simulated petroleum subprocess (100).

28. The system according to claim 27, said two or more simulated petroleum subprocesses (100) arranged for mutually transmitting simulated measurement signals (23) representing mass, temperature, pressure, momentum, density, composition or other state parameters or energy transfer, or simulated state variables (24), continuous states, variables, logical states like shut or open valves, or function modes on signal lines (143, 144).

29. The system according to claim 27, comprising a process signal modifier (22) being arranged for modifying said simulated measurement signals (23) or said states or control signals (24) between simulated petroleum plant subprocesses (100).

30. The system of claim 27, comprising real petroleum plant subprocesses (100R) (such as an electrical generator or other power supply systems with an electrical load rapid transients difficultly modeled, such as FAT/CAT test within a process system being assembled, but before any fluids are contained within the system, and in which one wishes to test the appropriate action of valves, actuators, hydraulics, sensors etc etc.) in the simulation process with simulated petroleum plant subprocesses (100).

31. The system of claim 23, said control system (2) comprising two or more control subsystems (200a, 200b, . . . , 200m) arranged for controlling petroleum process plant subsystems or corresponding simulators (100a, 100b, . . . , 100n).

32. The system of claim 31, said two or more control subsystems (200) mutually connected by signal lines (230, 240) arranged for transmitting measurement signals (203) and/or control signals (204) between said control subsystems (200a, 200b, . . . ).

33. The system of claim 32, comprising signal modifiers (209, 212) arranged for being connected on said signal lines (230, 240) between said control subsystems (200a, 200b, . . . ) arranged for modifying said measurement signals (203) and/or control signals (204) running between said control subsystems (200a, 200b).

34. The system according to claim 23, comprising two or more process plant control systems (2a, 2b, 2c, . . . ), each process plant control system (2a, 2b, 2c, . . . ) arranged for controlling one or more petroleum process plants (1a, 1b, 1c . . . ) being one or more of a offshore platform process plant (1a), a subsea process plant (1b), and optionally a land petroleum process plant (1c), to an integrated operations control system (50) using input signal lines (60a, 60b, 60c . . . ) from control system (2a, 2b, 2c, . . . ) said input signal lines (60a, 60b, 60c . . . ) respectively arranged for inputting monitoring signals (63) from plant control systems (2a, 2b, 2c, . . . ) to said integrated operations system (50), and using control signal lines (70) arranged for transmitting superior control signals (73) from said integrated operations system (50) to said process plant control systems (2a, 2b, 2c, . . . ).

35. The system according to claim 34, comprising input signal modifiers (39) arranged for being connected on said input signal lines (60a, 60b, 60c, . . . ) from said plant control systems (2a, 2b, 2c, . . . ) and said integrated operations control system (50), said input signal modifiers (39) arranged for modifying one or more of said monitoring signals (63) and inputting said one or more modified monitoring signals (64) and remaining unmodified monitoring signals (63) into said plant control systems (2a, 2b, 2c, . . . ).

36. The system of claim 34, comprising one or more control signal modifiers (32) on said monitoring output signal lines (70a, 70b, 70c, . . . ) from said integrated operations control system (50) to said plant control systems (2a, 2b, 2c, . . . ), said monitoring output signal modifiers (39) arranged for modifying one or more of said output monitoring signals (73) into modified monitoring output signals (74) and arranged for inputting said one or more modified monitoring signals (74) and remaining unmodified monitoring output signals (73) into said plant control systems (2a, 2b, 2c, . . . ).

37. The system according to claim 34, said integrated operations system (50) being remotely located, e.g. on a remote platform or remotely situated on-shore.