Directional Gamma Measurement Short Section – Accurate Formation Evaluation While Drilling
Product Technical Introduction
The Directional Gamma Measurement Short Section is a downhole measurement tool designed for real-time gamma ray data acquisition during directional and horizontal drilling operations. Installed as part of the MWD/LWD drilling assembly, it provides continuous formation evaluation data to support well trajectory control and geological decision-making while drilling.
This short section integrates gamma ray sensors with directional drilling tools, allowing operators to monitor lithology changes, formation boundaries, and shale content without interrupting drilling operations. Its compact structural design makes it suitable for space-limited bottom hole assemblies (BHA), especially in complex directional and extended-reach wells.
Measurement Principle & Functionality
The tool measures natural gamma radiation emitted by formations and converts the detected signals into electrical data, which are transmitted to the surface through the MWD system. Real-time gamma data helps drilling engineers:
- Identify formation changes
- Detect shale or sand boundaries
- Optimize wellbore placement
- Reduce drilling risks and non-productive time
The directional measurement capability ensures stable and reliable data acquisition even under high inclination and horizontal drilling conditions.
Structural Design & Engineering Features
The Directional Gamma Measurement Short Section is designed with a short-length, high-strength body structure, allowing easy integration into various directional drilling assemblies. The internal layout is optimized to protect sensitive electronic components from vibration, shock, and downhole pressure.
Key engineering considerations include:
- Compact structure for limited BHA space
- Optimized sensor placement for accurate gamma response
- High structural strength for directional drilling loads
- Enhanced sealing and protection for downhole electronics
Material Selection & Environmental Resistance
The tool housing is manufactured from high-strength alloy steel and processed with precision machining and heat treatment. It is designed to withstand harsh downhole environments, including high pressure, elevated temperature, drilling vibration, and impact loads.
Special attention is given to:
- Corrosion resistance
- Pressure containment
- Temperature stability
- Long-term operational reliability
Standards & Compatibility
The Directional Gamma Measurement Short Section is designed to be compatible with standard MWD/LWD systems and can be customized to match different drilling tool configurations. Thread connections and dimensional interfaces are manufactured according to industry standards to ensure reliable integration and interchangeability.
Quality Control & Testing
Each tool undergoes strict quality control procedures, including:
- Sensor calibration and functional testing
- Pressure and temperature testing
- Structural strength verification
- Electronic system inspection
- Final assembly and performance validation
These processes ensure accurate measurement performance and stable operation in the field.
Typical Applications
- Directional drilling operations
- Horizontal and extended-reach wells
- Real-time formation evaluation
- Geosteering and trajectory optimization
- Oil & gas exploration and development
