Defying Low Inclination & Magnetic Interference

How MEMS Gyro Directional Module Ensure Precision in Directional Drilling

In directional drilling for oil, gas, and mineral exploration, the low-inclination section—a critical transition between vertical and directional phases—directly impacts trajectory accuracy and operational safety. Yet, this is where traditional measurement tools often fail. Enter the MEMS Gyro Steering Assembly, a game-changing solution for reliable surveying in challenging wellbore conditions.

What is the Low-Inclination Section & Why Does It Matter?
The low-inclination section refers to the part of the wellbore where the inclination angle is low—typically below 5°–8°. This phase gradually steers the wellpath from vertical toward the planned angle, setting the foundation for subsequent directional drilling. Accuracy here is non-negotiable.

Why Traditional Tools Underperform in Low-Inclination Zones
While wellbore trajectory depends on accurate azimuth, inclination, and toolface measurements, each conventional method has critical limitations in low-inclination environments:

Magnetic Tools (e.g., MWD):
Rely on the Earth’s magnetic field—but are easily disrupted by magnetic interference from casing, adjacent wells, or magnetic formations. This often renders azimuth readings useless.

FOG & Mechanical Gyros:
Measure azimuth using Earth’s rotation, but suffer from significant errors at low angles, failing to meet precision requirements.

The MEMS Gyro Advantage: Precision Where Other Tools Falter
The ER-Gyro-15 MEMS Gyro Steering Assembly combines a triaxial MEMS gyro and accelerometer in a strapdown inertial system. Optimized sensor performance and advanced algorithms deliver unmatched accuracy in low-inclination intervals:

✅ Low-Inclination Accuracy

1°–2° inclination: Azimuth accuracy ≤ 3°

2°–5° inclination: Azimuth accuracy ≤ 2°

>5° inclination: High precision standard of 0.5°

Inclination accuracy: 0.1° | Gyro toolface: 1°/secL

✅ Immune to Magnetic Interference
Operates independently of the Earth’s magnetic field—delivering reliable data even inside casing or near magnetic disturbances.

✅ Fast Alignment & Continuous Operation
Achieves 1° azimuth accuracy in just 30 seconds, refining to 0.5° within 90 seconds. No need to switch tools between sections—enhancing efficiency and maintaining survey continuity.

Conclusion: No More “Low-Inclination Gap”
With the ER-Gyro-15, operators gain a seamless, high-accuracy solution from vertical through kick-off and beyond. It provides a precise attitude reference for directional drilling, reducing trajectory corrections, saving rig time, and lowering drilling costs.