Method and System of Validating Data Regarding Measured Hydrocarbon Flow

• US 20080125916A1
• Filed: 07/09/2007
• Published: 05/29/2008
• Est. Priority Date: 07/10/2006
• Status: Active Grant

• Current Assignee: Emerson Automation Solutions Measurement Systems & Services LLC
• Original Assignee: Daniel Measurement and Control Incorporated (Emerson Electric Company)
• Inventors: Ellender, Damon J., Toavs, Duane B.
• Granted Patent: US 8,027,793 B2
• Time in Patent Office: Days
• US Class Current: 700/282
• CPC Class Codes: G01F 1/42 Orifices or nozzles
• CPC Class Codes: G01F 15/063 using electrical means
• CPC Class Codes: G01F 15/0755 involving digital counting

Abstract

A method and system of validating data regarding measured hydrocarbon flow. At least some of the illustrative embodiments are systems comprising a flow computer coupled to a metering tube and configured to measure fluid flow through the metering tube, and a supervisory control and data acquisition (SCADA) system coupled to the flow computer. The SCADA system is configured to perform a validation on data provided by the flow computer regarding fluid flow. The flow computer is configured to perform the validation on the data regarding fluid flow, and the if the validation is successfully completed by the flow computer, the SCADA system refrains from performing the validation.

Claims

1. A system comprising:

a flow computer coupled to a metering tube and configured to measure fluid flow through the metering tube; and

a supervisory control and data acquisition (SCADA) system coupled to the flow computer;

wherein the SCADA system is configured to perform a validation on data provided by the flow computer regarding fluid flow;

wherein the flow computer is configured to perform the validation on the data regarding fluid flow, and the if the validation is successfully completed by the flow computer, the SCADA system refrains from performing the validation.

2. The system according to claim 1 wherein the flow computer is configured to alarm if the validation fails.

3. The system according to claim 1 wherein the flow computer performs the validation more often than once per billing cycle of measured fluid flow.

4. The system as defined in claim 1 wherein the flow computer is configured to correct the data regarding fluid flow if the validation fails.

5. The system according to claim 1 wherein when the flow computer performs the validation, the flow computer is configured to calculate average pressure and average temperature from raw temperatures and pressures, calculate an average uncorrected flow volume using the average values, and compare the uncorrected flow volume to the accumulated flow volume.

6. The system according to claim 1 wherein when the flow computer performs the validation, the flow computer is configured to calculating standard deviations on temperature and pressure data and to identify excursions.

7. The system according to claim 1 wherein when the flow computer performs the validation, the flow computer is configured to check for bias in at least one selected from the group consisting of:

temperature data; and

pressure data.

8. A flow computer comprising:

a processor; and

a memory coupled to the processor;

wherein the processor is configured to couple to transmitters associated with a metering tube, to perform fluid flow calculations to create fluid flow data, and to store the fluid flow data for later transfer to a supervisory control and data acquisition (SCADA) system; and

wherein the processor is configured to perform a validation on the fluid flow data prior to transfer of the fluid flow data to the SCADA system.

9. The flow computer according to claim 8 wherein the processor is configured to generate an alarm if the validation fails.

10. The flow computer according to claim 9 wherein the processor is configured to send the alarm to the SCADA system.

11. The flow computer according to claim 8 wherein the processor is configured to correct the fluid flow data if the validation fails.

12. The flow computer according to claim 8 wherein the processor is configured to perform the validation more often than a periodic billing cycle for the fluid flow.

13. The flow computer according to claim 8 wherein when the processor performs the validation, the processor is configured to calculate average pressure and average temperature from temperatures and pressures, calculate an average uncorrected flow volume using the average values, and compare the uncorrected flow volume to the fluid flow data.

14. A method comprising:

reading values of differential-pressure caused by fluid flow through an orifice of a metering tube;

storing the values of differential pressure to create raw data;

calculating an instantaneous flow values through the metering tube based on values of differential pressure;

calculating an accumulated fluid flow value based on the instantaneous flow values; and

validating the accumulated fluid flow value using the raw data.

15. The method according to claim 14 further comprising:

reading values of pressure upstream of the orifice plate;

storing the values of pressure upstream as part of the raw data;

wherein calculating instantaneous flow values further comprises calculating based on the values of differential pressure and the values of pressure upstream.

16. The method according to claim 14 further comprising:

sending the accumulated fluid flow value to a supervisory control and data acquisition (SCADA) system; and

sending an indication of whether the validating was successful.

17. The method according to claim 14 further comprising correcting the accumulated fluid flow value by the flow computer if the validating was unsuccessful.

18. The method according to claim 14 further comprising sending an alarm to a supervisory control and data acquisition (SCADA) system if the validating was unsuccessful.

19. A computer-readable medium storing a program that, when executed by a processor, causes the processor to:

read data values from transmitters associated with a metering tube;

calculate instantaneous flow values based on the data values;

accumulate the instantaneous flow values to create accumulated flow value;

provide the accumulated flow value to a supervisory control and data acquisition (SCADA) system upon request from the SCADA system; and

validate the accumulated flow values using the data values.

20. The computer-readable medium according to claim 19 where when the processor reads data values, the program causes the processor to read data values being at least one selected from the group consisting of:

temperature upstream of an orifice plate;

pressure upstream of the orifice plate; and

differential pressure across the orifice plate.

21. The computer-readable medium according to claim 19 wherein when the processor validates, the program causes the processor to validate the accumulated flow values more often than a periodic billing cycle for the fluid flow.

22. The computer-readable medium according to claim 19 wherein when the processor validates, the program causes the processor to calculate average pressure and average temperature, calculate an average uncorrected flow volume using the average values, and determine a different between the uncorrected flow volume to the accumulated flow value.