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Near-bit MWD System

Introduction
Near-bit MWD System XZ-NBMS was jointly developed by CNPC Xibu Drilling Engineering Company Limited and Beijing Liuhe Greatness Technology Co., Ltd, including survey sub and receiver. The survey sub is located between the screw stem and the drill bit with real-time dynamic azimuth gamma and inclination data measurement at the bit, which is electromagnetically transmitted to the receiver connected to the top of the screw stem, and then to the surface via MWD system.
Features
● Near-bit measurement
● Near-bit module inclination and dynamic azimuth gamma imaging measurement
● Wireless communication with data transmitted real-time across screw stem, compatible with all mud     types
Application
● Horizontal, ERD, and directional drilling
● Steering within formations with dipping beds
Parameters
Outer diameter
Φ172mm / Φ133.4mm /Φ105mm
(6.75″ / 4.75″ / 3.75″)
Rotation rate
30 to 450rpm
Inclination measurement
range and accuracy
0 to 180°   ±0.3°(static)
                 ±0.5°(dynamic)
GR measurement range
0 to 512API
Sensitivity
2.0CPS / API
Sampling time
Selectable 16 to 100s
Memory capacity
64Mbit
Environmental Parameters
Operating temperature           Up to 175°C / 347°F
Max. pressure                         120MPa / 17400psi