Key Technical Parameters

● North-seeking range: ±70° (latitude range)

● North-seeking accuracy: ≤0.05° (1σ)

● Repeatability: ≤0.1° (1σ)

● North-seeking time: ≤3 min

● Circular linearity (1σ): ≤0.05°

● Operating voltage: AC220V ±10%, 50Hz

● Power consumption: ≤ 50W

● Weight: ≤ 7.5kg

1.4 Electrical Performance

Insulation resistance: Under standard atmospheric conditions, the insulation resistance between independent circuits of the gyro north seeker, and between the circuits and the housing, shall be no less than 100 MΩ.

1.5 Maintainability

● MTBF ≥ 1000 hours

● MTTR ≤ 30 min

2. Environmental Requirements

● Operating temperature: -40℃ to +50℃

● Storage temperature: -55℃ to +65℃

Sand and Dust

Under the sand and dust conditions specified in Clause 2 of GJB150.12, the gyro north seeker shall not exhibit any of the following:

● Mechanism binding, jamming, or malfunction

● Short-circuiting or malfunction of electrical components

● Dust accumulation on internal optical or mechanical parts

Salt Fog

The gyro north seeker shall meet the salt fog requirements of GJB150.11.

Humid Heat

Relative humidity: 95%; temperature: 30±2℃; storage duration: 72 hours. Insulation resistance shall be no less than 2 MΩ, metal surfaces shall show no corrosion, and coatings shall show no blistering or peeling, with the unit remaining fully operational.

Vibration

Sinusoidal sweep vibration requirements:

● Frequency range 5Hz–5.5Hz: vibration displacement (peak-to-peak) 25.4mm

● Frequency range 5.5Hz–200Hz: vibration acceleration 1.5g

● Sweep time: 12 min

● Vibration axes: 3 (X, Y, Z)

● Duration per axis: 2 hours

Shock

Shock waveform: half-sine pulse. Peak acceleration: 20g, pulse width 11ms, 3 shocks per axis (X, Y, Z).

Collision

Peak acceleration: 10g; pulse width: 16ms; collision rate: 80 collisions/min along the vertical axis; number of collisions: 1000±10; collision direction: perpendicular to the mounting plane.

Road Test

Total road-test distance: 500 km, consisting of:

● Dirt/gravel road: 20–30 km/h, 300 km

● Asphalt/concrete road: 30–40 km/h, 200 km

Electromagnetic Compatibility

EMC performance shall comply with the relevant requirements of GJB151A-97

Rain

● Rain intensity: 6mm/min

● Rain angle: 45° from the top, 45° from each of the four sides

● Duration: 60 min

● Equipment state: unpowered

Magnetic Field

Under a magnetic flux density of (3±0.5)×10⁻⁴ T, the gyro north seeker's performance shall meet the specified technical requirements.

3. External Interfaces

3.1 Power Interface

The power interface uses connector: J599/20KA98PN

4.1 Operating Procedure

● Complete mounting of the gyro north seeker per Section 4.1.

● Wire the connectors per the pin definitions in 3.1 and 3.2, and verify the wiring is correct.

● Apply power and press the power button to power on; the system initializes and then enters the angle-measurement function.

● The measurement function offers two modes: real-time measurement and north-seeking measurement.

● After north-seeking completes, the unit waits for the next command.

● Power off the unit after use.

4.2 Use and Maintenance

● Check that the supply voltage meets requirements during use; if a fault is found, have a qualified technician service the unit.

● If no serial data output is observed during use, check that the wiring, serial port settings, and data format are correct; if a fault is found, have a qualified technician service the unit.

● The unit must be operated strictly according to this manual; failure to do so may cause permanent damage.

4.3 Maximum Ratings

● Shock: 10g, 8–12ms

● Operating temperature: -40℃ to +50℃

● Storage temperature: -50℃ to +65℃

Exceeding these maximum ratings during use may cause permanent damage to the product.

4.4 Precautions

● Handle the gyro north seeker gently during transport and installation; do not subject it to impact.

● Keep the carrier absolutely stationary during north-seeking, otherwise north-seeking accuracy will be affected.

● The carrier's longitudinal and lateral tilt shall not exceed ±1°, otherwise north-seeking accuracy will be affected.

5. Product Accessory List

The application scenarios of our product are as follows:

1.SLB Quest GWD – SAGD Wells, Northern Alberta, Canada

An oil-sands operator in Northern Alberta used SLB Quest GWD (solid-state gyro while drilling)​ for SAGD lateral sidetrack wells.

Magnetic interference from nearby wells and steel infrastructure made conventional MWD azimuth unreliable.

Result:

• Stable true-north azimuth under high magnetic interference

• Smaller ellipse of uncertainty (EOU)

• No extra non-magnetic collars needed

• Up to 36 m​ horizontal difference vs MWD survey caught before collision risk

• Operator adopted Quest GWD for multiple future wells

2. North Sea Platform Wells – Gyrodata / Quest GWD

In the North Sea, operators batch-drill wells from jackups and semisubs. Dense well clusters and high magnetic inclination make magnetic MWD uncertain.

Cases:

• 4 top-hole sections drilled from one jackup with gyro-while-drilling as primary direction source

• Remote survey monitoring from Aberdeen

• Whipstock orientation for sidetrack from vertical section

• No East–West gyro blind-zone issues with modern solid-state north-seeking gyros