Measurement-While-Drilling TeleScope* Tool


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
        Range: 0-180°
        Accuracy: ±0.1° (stationary) and ±0.2° (continuous)
        Resolution: 0.03° (stationary) and 0.1° (continuous)
        Range: 0-360°
        Accuracy: ±0.1° (above 5° stationary) and ±0.2° (continuous)
        Vertical resolution: 0.5° (stationary) and 1° (continuous)

* ®trademark of Schlumberger