Introduction
Near-bit measurement system is used to measure the inclination, temperature, gamma and rotate speed, etc in the position closest to the drill bit, and can be extended to add WOB,torque parameters.It consists of Survey Module, Receiver Module, MWD Receiver Module and adjust drill collar. When survey, the top of the near-bit measurement system is connected with screw and the bottom is conected with drill bit. There is sensor in the Survey Module, which is used to survey and transmit the signal wirelessly.
Patented ZL201220163580.2、ZL201320704593.0、201420734804.X.
Features
◆ Used at the survey position closest to the bit
◆ Real time provide the attitude parameters of the bit
◆ Storage data
◆ Wireless data transmission
Main Technical Parameters
| Bit speed | 0～300R/min | ±10% |
| Inclination | 0～180° | ±0.5° |
| Toolface | 0～360° | ±0.5°(inclination≥10°) |
| Working temperature | 0～150°C/32～270°F | |
| Highside and lowside gamma sensitivity | 0～500API | ±5% |
| Highside and lowside gamma accuracy | 1CPS/API | |
| Pressure resistance | 100MPa/14503psi | |
| Torque | 0～40KN·m | ±2% |
| Bit pressure | 0～400KN | ±2% |
| Continuous working time | 200h |
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