The MicroTesla NDM, New Digitized Module, is a new, high accuracy, an advanced directional instrument designed for those MWD companies that have developed their own MWD system controller.
It consists of a one-piece chassis made from a solid billet of 6061-TG aluminum. The ends are machined to the Customers system geometry. No end adapters mean no “loose” end adapters and no end adapter misalignment.
The NDM has (1) electronic board, for the core drive, mag sense, analog to digital conversion and power supply. The NDM has a high temperature, 24 bit analog to digital converter for extremely high-resolution measurements.
The MicroTesla ring core, fluxgate magnetometers are qualified to 210 degrees C and these magnetometers can detect a 1.6 nT magnetic field gradient.
Length: Nominal 22.0”
(2) MicroTesla proprietary two-axis fluxgate magnetometers
(3) Q-flex accelerometers
Surface mount, high-temp electronics with Ulti-pak
Voltage requirement: +10V to +40V
Power Usage: 2W peak, .72W idle
Digital interface: SV TTL
Calibration coefficients downloaded directly into EEP ROM
All boards qualified for high-temp applications, 175C
Accelerometers qualified, 185C
MicroTesla magnetometers qualified, 210C
Stronger stiffer chassis for improved resistance to bend and torsion twist.
Mechanical and Environmental Specifications
|Survival Temperature||– 40
|Vibration, Random||20||g RMS, 25-500 Hz|
|Shock||1000||½ msec and ½ sine|
Instrument Accuracy Specifications
|Inclination accuracy, absolute*||± 0.08||degrees|
|Inclination spread on axial rotation at 90° Inc||< 0.08||degrees|
|Azimuth accuracy, absolute, 90° Inc||± 0.4||degrees|
|Azimuth spread axial rotation, 45° through 90°||< 0.35||degrees|
|Total face accuracy, axial rotation at 90° Inc||± 0.7||degrees|
|Total g field accuracy||± 2.5||mG|
|Total H field accuracy, absolute||± 180||nT|
|Total H field spread||< 150||nT|
|Magnetic dip accuracy||± 0.2||degrees|
|Dip spread||< .25||degrees|
|Inc.. while rotating||< .25||degrees|
|AZM while rotating||< 2||degrees|
|RPM rotation||> 10||RPM|