INTAJ LLC (Oman) has recently acquired state of the art Gyro tools in order to provide Gyroscopic Survey services for the Oman region. The tools in question have a proven track record of being highly accurate and robust with verified error models.
North Seeking Solid State Continuous Tracking Gyro
The Gyro is suitable for a variety of applications including:
- Drop method gyro surveys
- Continuous gyro surveys using wireline with survey speeds up to 100 m/min*.
- Memory gyro surveys using slickline or coil tubing.
- Real-time surface readout gyro surveys
- Real-time orientations and steering
- Gyro multi-shot surveys
- Gyro single-shot orientations
*Speeds are dependent on well profile
Features:
- Solid-state north seeking gyroscopic technology (No warm up time needed)
- High speed, high resolution continuous tracking
- Precise accuracy unaffected by magnetic interference
- Rugged design – reliable in extreme drilling environments
- Real-time and memory capabilities
- High temperature option availability
Performance:
- Azimuth accuracy = +/- 0.1 degrees
- Gyro tool-face accuracy = +/- 0.1 degrees
- Inclination accuracy = +/- 0.1 degrees
- Gravity tool-face accuracy = +/- 0.1 degrees
- Battery life = greater than 30 hours
- Gyro compass time ≤ 1 minute = +/- 0.75 degree
*Azimuth values are not reliable at orientations within 20° of EAST or WEST horizontal line but are valid for all other horizontal azimuths. Inclination values are valid at all orientations.
Instrument Accuracy:
Inclination |
|
Type |
Tri-axial |
Range |
0-180° |
Accuracy |
+/- 0.1° |
Gyroscope |
|
Type |
Solid State |
Accuracy |
+/- 0.1° |
Instrument Size in Thermal Housing |
|
Diameter |
46mm (1.8”) |
Length |
2.36m (93.1”) |
Maximum Pressure Rating |
1800 PSI |
Temperature Rating |
Dependent on heat-shield type |
Quality Control and Assurance:
INTAJ LLC has placed a number of quality control measures in ensure that the surveys being delivered meet the required confidence level. By developing and implementing a number of procedures and processes, INTAJ LLC can always assure that the quality of survey provided is always within the High Temp Drop system’s error model range.
Calibration:
All Gyro instruments undergo a calibration process at the Manufacture’s base or control center. Measurements of known inclinations and azimuths are taken and recorded along with any delta values. A pass / fail criteria is created for the delta values.
On Job verification procedure
INTAJ LLC has set guidelines in the development of a PRE and POST job procedure where the tool’s attitude in known latitude is scrutinized. A focus on the HER (Horizontal Earth Rotation) measurements are examined as well as the GYRO sensor readings with a PASS/FAIL criteria put in place for the delta values.
This gives the clients confidence that the tool measurements were at the desired accuracy before, during and after the job.