SPT and Segofs Energy Successfully Deploy SPT’s First In-House Gyro While Drilling System, Demonstrating Collision-Avoidance Gains and Significant Rig-Time Savings in Nigeria

The Evwreni-15 well presented a high-risk collision scenario, with anti-collision analysis showing a minimum separation of approximately 30 ft from the adjacent Evwreni-11 well. The presence of steel casing and an East-West trajectory, well known for degrading magnetic sensor accuracy, made standard MWD-based directional surveying unsuitable for the operation.

To mitigate collision risk and maintain precise wellbore placement, Segofs selected the SPT GyroTracer GWD, which relies on a high-accuracy north-seeking gyroscope rather than the Earth’s magnetic field. This magnetic-field-independent approach enables consistent and reliable directional data, even in close proximity to casing, conductors, or other sources of magnetic distortion.

Faster Surveys, Zero Re-runs, and Tangible Cost Savings

One of the most notable outcomes of the deployment was the reduction in survey time and associated non-productive time. While competing gyro systems typically require 5-9 minutes per survey in the region, the GyroTracer GWD consistently completed full measurements in under 3.5 minutes.

According to the operator, this performance delivered several operational benefits:

• At least 12 hours of rig timesaved, translating to approximately USD 60,000 in avoided rig spread costs

• Elimination of drop-gyro runs over the first 2,000 ft of drilling

The system also proved critical during a trajectory nudge at 600 ft, where accurate, magnetically independent data enabled confident directional control despite interference from a 24-in. conductor.

Design and Intelligent Data Quality Control

The GyroTracer GWD is designed for seamless integration with Tensor-based MWD systems and

EclipseTouch software, allowing flexible placement anywhere in the bottomhole assembly. The tool operates using multiple intelligent modes that balance power consumption with measurement precision.

Advanced onboard processing filters environmental noise and disturbances to deliver high-quality survey data under demanding downhole conditions. Each survey is automatically accompanied by a real-time quality control (QC) assessment, allowing drilling and directional teams to immediately verify data reliability and determine whether a repeat measurement is required-reducing uncertainty and preventing unnecessary delays.