Azimuthal gamma
Quad Orbital
Directional gamma response while rotating and sliding.
Four gamma sensors in one retrievable probe provide selectable azimuthal bins, up/down sliding measurements and rotary inclination. The module is designed to replace the gamma module in a compatible MWD string.
- azimuthal bins
- 2 / 4 / 8
- temperature rating
- 175°C
- pressure rating
- 20,000 psi
Measurements & capabilities
- Selectable two-, four- and eight-bin gamma
- Up and down gamma during slides
- Rotary inclination and downhole RPM
- Shock, vibration and stick-slip detection
- Field-adjustable sampling and filtering
- Real-time data and memory recording
Applications
- Directional and horizontal drilling
- Formation-boundary and fault interpretation
- Formation context during rotation and slides
MEASUREMENT IN CONTEXT
Put direction back into the gamma response.
Azimuthal measurements add orientation to formation response. Review the illustrated high-side reference and event orientation alongside the well trajectory when interpreting the image.
Open the full graphic
Published technical parameters
System specifications
Mechanical and environmental
| Parameter | Published value |
|---|---|
| Probe diameter | 1.875 in |
| Probe length | 69.5 in |
| End connections | 10-pin Kintec |
| Operating pressure | 20,000 psi |
| Operating temperature | 175°C / 347°F |
| Random vibration, 50–1000 Hz | 20 G, three axes |
| Z-axis shock | 500 G / 0.5 ms |
| X/Y-axis shock | 1,000 G / 0.5 ms |
| Sensitivity | 0.2 CPS |
The duplicated input-voltage entries in the supplied source are withheld pending confirmation.
Orientation and measurement
| Parameter | Published value |
|---|---|
| Two-bin gamma | 180° windows |
| Four-bin gamma | 90° windows |
| Eight-bin gamma | 45° windows |
| Rotary inclination accuracy | ±0.25° |
| RPM accuracy | ±1 rpm |
| Maximum RPM | 100 rpm |
| Shock measurement range | 100 G |
| Shock measurement accuracy | ±1 G |
| RMS vibration accuracy | ±1 G |
| Shock-count threshold | Field programmable |
| Temperature resolution | 1°C |
Source entries apparently copied from the Flashlight measurement list are excluded.
Technical documentation
Quad Orbital technical sheet
Reformatted specifications and application notes, with source qualifications retained. Technical-review edition; confirm the current assembly rating with MWD Solutions before use.