Operator: Ukrgasvydobuvannya (UGV)
Summary: Downhole tools operating in high-pressure, high-temperature (HPHT) and complex wellbore environments face extreme reliability challenges. In two separate drilling campaigns—one in a deep high-temperature sidetrack and another in a high-risk wide-diameter interval—MWDPlanet’s telemetry systems and high-performance battery packs delivered exceptional performance. This paper outlines two case studies, highlighting tool resilience, precision geosteering, and operational efficiency achieved using this equipment.
Case Study 1 — Deep HPHT Sidetrack with Geosteering Complexity
Challenges
- Well Type: Directional / Sidetrack
- Kick-off Point (KOP): 5,480 m
- Total Depth: >5,000 m
- Hole Size: 146.05 mm
- Mud Weight: 1,800–1,900 kg/m³
- Standpipe Pressure: 300 atm
- Bottomhole Circulating Temperature: 133°C
- Operational Risk: High risk of intersecting with previous wellbore
Solutions
- MWDPlanet deployed a rugged, high-temperature-rated pulse telemetry system with electronics stable up to 175°C and enhanced mud-pulse signal processing.
- MWDPlanet supplied Li-SOCl₂ battery packs for high thermal stability and long-duration operation (>120 hrs at >150°C).
- Optimized BHA design and expert drilling engineering ensured safe trajectory execution.
Results
Stable MWD Signal for Entire 5000m+ Lateral
No Tool Failures Despite HPHT Exposure
Geosteering Completed Successfully, Geological Objectives Fully Met
Case Study 2 — Long Interval in High-Risk Interference Zone
Challenges
- Measured Depth Interval: 440 m to 2,800 m (Total: 2,360 m)
- Hole Size: 311.15 mm
- Operational Risk: Proximity to nearby wells and long open hole section
Solutions
- MWDPlanet deployed an MWD toolset optimized for wide-diameter applications.
- MWDPlanet’s equipment power efficiency provided extended downhole run time.
- One optimized BHA was used for the entire interval, supported by real-time performance monitoring.
Results
One-Run Drilling of the Full Interval Using a Single BHA
214 Hours of Effective Drilling Time, 352 Total Hours Below the Rotary Table
Target Depth Achieved Ahead of the Planned Drilling Schedule
No Unplanned Trips or Tool-Related Downtime
| Wireline Retrievability | Retrievable and/or reseatable |
| Shock Limit | 1000 g, 0.5 msec, ½ sine all axes |
| Vibration Limit | 5-30 Hz at 1 in double amplitude,
30-500 Hz, 20 g all axes |
| Operating Temperature (Max) | 175°C (347°F) |
| Hydrostatic Pressure (Max) | 137,895 kPa
20, 000 Psi |
| LCM Tolerances (Max Recommended) | 40 Lbs/bbl
medium not plug, premixed Terre-LP Heavy version tolerates up to 45kg force on the servo poppet |
| Operating hours (on one battery) | Up to 600 hours |
Conclusion
These two case studies confirm the field-proven reliability of MWDPlanet’s telemetry systems in extreme conditions. The toolset enabled extended tool life, continuous data transmission, fewer trips, and on-schedule or accelerated project completion.
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