MDM 175T 4AM
MDM 175T 4AM
The MicroTesla MDM 4AM instrument is a brand new, patent pending, directional steering instrument. It incorporates an additional accelerometer and two additional magnetometers for the industry’s first 8-axis sensor array.
In addition to the sensor redundancy, the sensor axes are arranged in a skewed array. This skewed array requires a new mathematical treatment which results in optimal sensor outputs in virtually every instrument orientation.
The oversubscribed equations provide a unique opportunity to use advanced survey quality management methods to ensure that borehole surveys are acquired during drilling.
This allows a direct reduction in borehole uncertainty and ensures optimal wellbore placement into the production reservoir. Development of near wellbore proximity algorithms is also being undertaken.
Physical
- Length: Nominal 32”
- Diameter: 1.37”
- (4) MicroTesla proprietary fluxgate magnetometers
- (4) Honeywell Mini-Q accelerometers
- All XE chassis boards are covered with a one-piece sleeve
Electrical
- Surface-mount electronics packaging with Ulti-pak board encapsulation
- Voltage requirement: 12V to 36V
- Power Usage: 1.6W peak, 0.5W idle
- Digital interfaces: serial RS-232, serial TTL, serial logic level or SPI
- High-resolution analog-to-digital conversion and onboard memory
Enviornmental
- All boards qualified for high-temp applications, 175°C
- Honeywell accelerometers qualified, 185°C
- MicroTesla magnetometers qualified, 200°C
- Ulti-pak board mounting for improved shock and vibration isolation
Mechanical and Environmental Specifications
| Parameter | Minimum | Maximum | Units |
|---|---|---|---|
| Outside Diameter* | 1.37 3.5 | inches cm |
|
| Length* | 22 55.9 | inches cm |
|
| Operating Temperature | 0 + 32 | 175 347 | °C °F |
| Survival Temperature | – 40 – 40 | 190 374 | °C °F |
| Vibration, Random | 20 | g RMS, 25-500 Hz | |
| Shock | 1000 | ½ msec and ½ sine |
Instrument Accuracy Specifications
| Parameter | Minimum | Units |
|---|---|---|
| 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 |
| RPM | +/- 2 | RPM |
* Absolute accuracy is achieved when the instrument is tested in a controlled environment using a calibrated and certified reference position