Measurement-While-Drilling TeleScope* Tool
Description
The MWD-TeleScope tool is an in-line drill collar that records at-the-bit drilling parameters and telemeters the drilling parameter data as well as data from other LWD tools to the surface in real time. MWD measurements include downhole weight-on-bit and torque, shocks, temperature, flow rate, rate of penetration, borehole direction and inclination.
The tool uses a continuous mud wave, or siren-type, telemetry method and incorporates design features and software that enable it to approach data transmission rates of 6 to 12 bits per second.
Tool Specifications
| Temperature rating: | 350° F (177° C) |
| Pressure rating: | 20 psi (138 MPa) |
| Length: | 28 ft (8.5 m) |
| Weight: | 2,085 lbs (946.6 kg) |
| API nominal collar outside diameter: | 6.75 in (17 cm) |
| Maximum outside diameter: | 6.9 in (17.5 cm) |
| Minimum bit size: | 8.375 in (21.3 cm) |
| Maximum bit size: | 9.875 in (32.5 cm) |
| Flow range: | 250-800 gpm |
| Pressure drop coeffecient (C)*: | 16,000 |
| Maximum curvature – sliding: | 15 deg/100 ft (15 deg/31 m) |
| Maximum rotary torque: | 12,000 ft-3,658 m-lbf |
| Minimum operating RPM: | 0 rpm |
| Uphole connection: | 5-1/2 FH box |
| Downhole connection: | 5-1/2 FH box |
| (*) pressure drop = [mudweight in ppg] x [flow in gpm]²/C |
Measurement Specifications
| Gamma Ray | |
| Range: | 0-300 GAPI |
| Accuracy: | ~13 GAPI |
| Inclination | |
| Range: | 0-180° |
| Accuracy: | ±0.1° (stationary) and ±0.2° (continuous) |
| Resolution: | 0.03° (stationary) and 0.1° (continuous) |
| Azimuth | |
| Range: | 0-360° |
| Accuracy: | ±0.1° (above 5° stationary) and ±0.2° (continuous) |
| Vertical resolution: | 0.5° (stationary) and 1° (continuous) |
* ®trademark of Schlumberger