SYSTEM AND METHOD FOR MONITORING TOOL ROTATION DURING A GYROCOMPASSING WELLBORE SURVEY

• US 20150285056A1
• Filed: 04/04/2014
• Published: 10/08/2015
• Est. Priority Date: 04/04/2014
• Status: Active Grant

• Current Assignee: Gyrodata Incorporated (SLB)
• Original Assignee: Gyrodata Incorporated (SLB)
• Inventors: Ledroz, Adrin Guillermo, Johnson, James Michael
• Granted Patent: US 9,631,475 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: E21B 47/024 of devices in the borehole determining slope or direction of the borehole E21B47/022
• CPC Class Codes: G01C 19/00 Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
• CPC Class Codes: G01P 15/14 by making use of gyroscopes gyroscopes per se G01C19/00

Abstract

Systems and methods for monitoring the tool rotation of a survey tool within a wellbore during a gyrocompassing survey measurement are provided. A plurality of signals from at least one accelerometer module of the survey tool is indicative of measurements of the Earth'"'"'s gravitation vector taken by the at least one accelerometer module during the gyrocompassing survey measurement. The plurality of signals is used to calculate a tool face rate of change of the survey tool with respect to the wellbore during the gyrocompassing survey measurement.

Claims

1. A method for monitoring the tool rotation of a survey tool within a wellbore during a gyrocompassing survey measurement, the method comprising:

receiving a first plurality of signals from at least one accelerometer module of the survey tool, the first plurality of signals indicative of measurements of the Earth'"'"'s gravitation vector taken by the at least one accelerometer module during the gyrocompassing survey measurement; and

using the first plurality of signals to calculate a tool face rate of change of the survey tool with respect to the wellbore during the gyrocompassing survey measurement.

2. The method of claim 1, wherein the at least one accelerometer module is configured to provide signals indicative of three orthogonal components of the Earth'"'"'s gravitation vector at the position of the at least one acceleration module.

3. The method of claim 1, wherein the tool face rate of change is about a longitudinal axis of the survey tool.

4. The method of claim 1, wherein the survey tool comprises a gyro-while-drilling (GWD) survey tool or a measurement-while-drilling (MWD) survey tool and the at least one accelerometer module is part of the GWD survey tool or the MWD survey tool.

5. The method of claim 1, wherein the survey tool comprises a gyro-while-drilling (GWD) survey tool and the at least one accelerometer module is separate from the GWD survey tool.

6. The method of claim 1, wherein the survey tool comprises a measurement-while-drilling (MWD) survey tool and the at least one accelerometer module is separate from the MWD survey tool.

7. The method of claim 1, wherein the at least one acceleration module is dedicated to measurements of the Earth'"'"'s gravitation vector during times at which the survey tool is used for gyrocompassing.

8. The method of claim 1, further comprising:

receiving a second plurality of signals from at least one gyroscopic sensor module of the survey tool, the second plurality of signals indicative of a total rotation rate to which the survey tool is subjected during the gyrocompassing survey measurement;

using the second plurality of signals to calculate the total rotation rate to which the survey tool is subjected during the gyrocompassing survey measurement; and

subtracting the tool face rate of change with respect to the wellbore during the gyrocompassing survey measurement from the total rotation rate to which the survey tool is subjected during the gyrocompassing survey measurement.

9. The method of claim 8, wherein the at least one gyroscopic sensor module comprises one or more rate gyroscopes.

10. The method of claim 8, wherein subtracting the tool face rate of change from the total rotation rate is performed as part of a calibration correction process of the at least one gyroscopic sensor module.

11. The method of claim 1, wherein the gyrocompassing survey measurement is taken during a survey selected from the group consisting of:

a wireline survey, a slickline survey, and a drop survey.

12. A method for compensating for tool rotation of a survey tool within a wellbore during a gyrocompassing survey measurement, the method comprising:

receiving a first plurality of signals from at least one accelerometer module of the survey tool, the first plurality of signals indicative of measurements of the Earth'"'"'s gravitation vector taken by the at least one accelerometer module during the gyrocompassing survey measurement;

using the first plurality of signals to calculate a tool face rate of change of the survey tool with respect to the wellbore during the gyrocompassing survey measurement;

receiving a second plurality of signals from at least one gyroscopic sensor module of the survey tool, the second plurality of signals indicative of a total rotation rate to which the survey tool is subjected during the gyrocompassing survey measurement;

using the second plurality of signals to calculate the total rotation rate to which the survey tool is subjected during the gyrocompassing survey measurement; and

subtracting the tool face rate of change with respect to the wellbore during the gyrocompassing survey measurement from the total rotation rate to which the survey tool is subjected during the gyrocompassing survey measurement.

13. A system comprising:

a survey tool configured to perform gyrocompassing surveys, the survey tool comprising at least one gyroscopic sensor module configured to generate a first one or more signals indicative of measurements of a total rotation rate to which the at least one gyroscopic sensor module is exposed during a gyrocompassing survey;

at least one accelerometer module configured to generate a second one or more signals indicative of measurements of the Earth'"'"'s gravitation vector at the at least one accelerometer module; and

at least one processor configured to receive at least the first one or more signals and the second one or more signals and to determine the tool angle rotation rate in response to the second one or more signals.

14. The system of claim 13, wherein the at least one processor is further configured to determine a rotation rate of the survey tool compensated for the tool angle rotation rate in response to both the first one or more signals and the second one or more signals.

15. The system of claim 13, wherein the at least one processor is further configured to calculate a tool face rate of change about a longitudinal axis of the survey tool using the second one or more signals.

16. The system of claim 13, wherein the at least one accelerometer module is separate from the survey tool.

17. The system of claim 13, wherein the survey tool comprises at least one gyro-while-drilling (GWD) survey tool or at least one measurement-while-drilling (MWD) survey tool.

18. The system of claim 13, wherein the second one or more signals is indicative of three orthogonal components of the Earth'"'"'s gravitation vector at the position of the at least one acceleration module.

19. The system of claim 13, wherein the survey tool is configured to perform gyrocompassing surveys selected from the group consisting of:

wireline surveys, slickline surveys, and drop surveys.