2DVA-1000 Borehole Deviation Probe
Overview
The 2DVA-1000 system reports borehole inclination, bearing, true
vertical depth, northing, and easting. These parameters are calculated
in real time using the quantities measured by the probe.
The probe contains a three axis magnetometer and a three axis
accelerometer. These measurements are temperature corrected by a
downhole microprocessor. These values are transmitted to the surface for
processing.
Surface hardware and software necessary includes an MGX II Portable
Digital Logger, or the MGX II Console along MSLog data acquisition
software. Optional 3D Plotting Software ; PSPlot is available.
Controls, Connectors, and Layout
The 2DVA-1000 probe has no external controls available to the user. The
standard probe top is a 4 conductor quick disconnect connector, or an
single conductor probe top. A 4 conductor GOI probe top is available as
an option.The probe measures the magnetic field and acceleration in
three different directions, that is, along three orthogonal axis. The
probe has an index mark (a 'V') stamped on the lower part of the
housing. This mark indicates the side of the probe from which the
positive X axis extends. The Z axis is the longitudinal axis and points
down. The Y axis is defined using a right hand coordinate system where
the cross product of X and Y equal Z. The X and Y axis are in the
horizontal plane when the probe is vertical.
Theory of Operation
The 2DVA-1000 uses three flux gate magnetometers to measure the magnetic
field in the direction of each of the axis. Three piezo electric
accelerometers measure the acceleration due to gravity.
Specifications
Length
|
|
120 cm
|
Diameter
|
|
4.4 cm
|
Weight
|
|
4 Kg
|
Operating Temperature
|
|
0 - 70 degrees C
|
Maximum Pressure
|
|
200 Bar (3000 psi)
|
Directional Accuracy
|
|
+/- 0.5 degrees
|
Range of measurable inclination
|
|
0 - 89.9 degrees
|
Operating Voltage
|
|
36-72 VDC
|
Operating Current
|
|
100 mADC
|
Communications
|
|
9600 Baud, 8 bits, 1 stop, no parity
|
Ordering Information
Description
|
|
Order Number
|
| 2DVA-100 Deviation Probe |
|
530-400-0100MS |