The MWD is a positive pulse system with minimum moving parts for extended downhole life and simple maintenance. This uniquely flexible design is capable for use in drill collar sizes from 88.9mm (3.50in.) up to and including 228mm (11.0in.)
The system is fully retrievable and replaceable via wireline. The pulser is located on the lower end of the tool and fits into an orienting flow restrictor sub. The remainder is centered in a standard non-magnetic drill collar.
• Pulser Driver
• Directional Sensors
• Electronics Module
• Battery Module
• Gamma Module
Dimensions
Diameter 47.6 mm (1.88in.)
Length 7.30m (24 ft.)
or 9.50m (31 ft.) with second battery or gamma instrument
Operating Specifications
Maximum downhole temperature
150 degree C / 302 degree F
Operational time - 200 hours per lithium battery module
Maximum pressure - 138,000 kPa (20,000 PSI)
Operating flow rate will depend on BHA
Data Measurements
• Inclination
• Azimuth
• Dip angle
• Gravity tool face
• Magnetic tool face
• Temperature
• Battery voltage
• Gamma counts
• Depth tracking
Data Transmission
Positive-pulse
Maximal lateral displacement error:
2.6 ft./1000 ft. or a conical uncertainty of 0.15 maximum
Inclination accuracy: 0.1
Toolface accuracy: 0.5
Dip angle accuracy 0.1
Maximum lost-circulation material:
40-50 ppb concentration, any size