MWD Directional System telemetry system DRILL-TEK MWD-175-G / DR
The telemetry system is used for geo-navigation and geophysical support while drilling.
Geo-navigation and geophysical support include the following technological data:
- Anti-aircraft angle;
- azimuth angle;
- Deflector Position (TFO);
- the natural radioactivity of the surrounding rocks;
- well temperature.
Technical characteristics of the telemetry system:
| Description | Characteristic | |
|---|---|---|
| Total Telemetry System Length | 10.11m - Standard 8.8m Gamma Orienteering - Gamma Orienteer | |
| Outer Diameter of Telemetry System Modules | 47.6 mm (1.875 in) | |
| Distance from the spatial orientation sensor to the bottom of the telemetry system | 4.48 m - standard layout for orientation with a gamma module 3.17 m - standard layout for orientation without gamma module | |
| Distance from the spatial orientation sensor to the bottom of the telemetry system | 4.48 m - standard layout for orientation with a gamma module 3.17 m - standard layout for orientation without gamma module | |
| Power Source | 27V lithium-temperature batteries, 400-500 h * battery life (MWD includes two batteries, main and backup). | |
| Signal type | Hydraulic channel, positive pulses | |
| Programming | Programming modules on the surface with the possibility of changing the operating modes on the bottom. | |
| Possibility of emergency removal | 57 mm - minimum through diameter | |
| Maximum operating temperature | 175 ˚C (347 ˚F) | |
| Maximum drilling fluid pressure | 137.9 MPa (20,000 Psi) | |
| Recommended Drilling Fluid Consumption | 0.30 - 0.63 m3 / min. (5 - 10.5 l / s), Ø3 ½ ”(88.9 mm) 0.38 - 1.14 m3 / min. (6.3 - 19 l / s), Ø4 ¾ ”(120.6 mm) 0.57 - 2.27 m3 / min. (9.5 - 37.8 l / s), Ø6 ½ ”(165.1 mm) 1.5 - 4.45 m3 / min. (25 - 74.2 l / s), Ø8 ¼ ”(214 mm) | |
| Pressure drop when pumping liquid at a density of 1000 kg / m3 | 0.689 MPa at 25.5 l / s (100 psi at 1.52 m3 / min) | |
| Maximum content of clogging impurities (medium size with good mixing) | 154.6 - 193.3 kg / m3 (40 - 50 ppb) | |
| Maximum sand content in drilling mud | 1% | |
| Measurement error: | ||
| Anti-aircraft angle, deg. | ± 0,1˚ | |
| Azimuthal angle, deg. | ± 0.25˚ | |
| Deflection mounting angle, deg | ± 0,5˚ | |
| Natural Gamma Radiation Level (AI GR) | ± 7% | |
| Temperature, C˚ | ± 2.5˚C | |
