SYSTEMS AND METHODS OF DETERMINING PARAMETER VALUES IN A DOWNHOLE ENVIRONMENT

• US 20130091944A1
• Filed: 10/17/2011
• Published: 04/18/2013
• Est. Priority Date: 10/17/2011
• Status: Active Grant

• Current Assignee: Schlumberger Technology Corporation (SLB)
• Original Assignee: Schlumberger Technology Corporation (SLB)
• Inventors: Terabayashi, Toru, Kamei, Hideyuki, Motoki, Takenori, Tomiyama, Kozue, Tanaka, Tetsuya, Hori, Martine
• Granted Patent: US 8,534,115 B2
• Time in Patent Office: Days
• US Class Current: 73/152.54
• CPC Class Codes: E21B 49/10 using side-wall fluid samplers or testers
• CPC Class Codes: G01D 18/008 with calibration coefficients stored in memory

Abstract

Systems and methods of determining parameter values in a downhole environment are described. An example method of determining a parameter value using calibration information is described. The calibration information corresponding to different parameter ranges in a downhole environment. The method includes determining a parameter range in the downhole environment using a controller and obtaining first calibration information or second calibration information based on the parameter range. The first calibration information associated with a first parameter range and the second calibration information associated with a second parameter range. The method also includes receiving an output signal from a sensor associated with the parameter and using the obtained calibration information to determine the parameter value based on the output signal received.

Claims

1. A method of determining a parameter value using calibration information, the calibration information corresponding to different parameter ranges in a downhole environment, comprising:

determining a parameter range in the downhole environment using a controller;

obtaining first calibration information or second calibration information based on the parameter range, the first calibration information associated with a first parameter range and the second calibration information associated with a second parameter range;

receiving an output signal from a sensor associated with the parameter; and

using the obtained calibration information to determine the parameter value based on the output signal received.

2. The method of claim 1, wherein obtaining the first calibration information or the second calibration information comprises the controller automatically selecting the respective calibration information.

3. The method of claim 1, wherein obtaining the first calibration information or the second calibration information comprises the controller receiving an input from an operator.

4. The method of claim 1, wherein the first calibration information comprises first calibration coefficients and the second calibration information comprises second calibration coefficients.

5. The method of claim 1, wherein the first parameter range comprises a smaller range than the second parameter range.

6. The method of claim 5, wherein the first parameter range and the second parameter range are at least partially overlapping.

7. The method of claim 1, wherein the first parameter range and the second parameter range are substantially non-overlapping.

8. The method of claim 1, wherein the parameter comprises at least one of temperature or pressure.

9. The method of claim 1, wherein the first parameter range comprises a first temperature range and the second parameter range comprises a second temperature range.

10. The method of claim 1, wherein the first parameter range comprises a first temperature range and a first pressure range and the second parameter range comprises a second temperature range and a second pressure range.

11. The method of claim 1, wherein a first sensor is associated with the first calibration information and a second sensor is associated with the second calibration information.

12. A system to determine a parameter value in a downhole environment, comprising:

a controller; and

a sensor, at least one of the controller or the sensor associated with a first calibration coefficient and a second calibration coefficient, the first calibration coefficient corresponding to a first parameter range and the second calibration coefficient corresponding to a second parameter range different from the first parameter range, wherein, based on a parameter range of the downhole environment, the controller is to select one of the first calibration coefficient or the second calibration coefficient to be applied to an output signal received from the sensor to determine the parameter value, the output signal associated with the parameter.

13. The system of claim 12, wherein the sensor comprises a first sensor associated with the first calibration coefficient and a second sensor associated with the second calibration coefficient.

14. The system of claim 13, further comprising a switch to select the first sensor or the second sensor based on the parameter range of the downhole environment.

15. The system of claim 12, wherein the parameter comprises at least one of temperature or pressure.

16. The system of claim 12, wherein the first parameter range comprises a first temperature range and the second parameter range comprises a second temperature range.

17. The system of claim 12, wherein the first parameter range comprises a first temperature range and a first pressure range and the second parameter range comprises a second temperature range and a second pressure range.

18. The system of claim 12, wherein the parameter range of the downhole environment is determined using the controller.

19. A downhole tool, comprising:

a controller disposed within a body of the downhole tool; and

a sensor, at least one of the controller or the sensor associated with a first calibration coefficient and a second calibration coefficient, the first calibration coefficient comprising a first parameter range and the second calibration coefficient comprising a second parameter range different from the first parameter range, wherein, based on a parameter range of the downhole environment, the controller is to select one of the first calibration coefficient or the second calibration coefficient to be applied to an output signal received from the sensor to determine a parameter value, the output signal associated with the parameter.

20. The downhole tool of claim 19, wherein the downhole tool comprises a wireline formation tester.