OfiTE 700-410 User manual

OFITE Spectral Gamma Ray Logger
Part No.: 700-410
Instruction Manual
Updated 9/6/2022
Ver. 2
OFI Testing Equipment, Inc.
11302 Steeplecrest Dr. · Houston, Texas · 77065 · U.S.A.
Tele: 832.320.7300 · Fax: [phone] · www.ote.com
©Copyright OFITE 2014

OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: [phone] / Fax: [phone] / www.ote.com 1
Introduction.....................................................................................2
Description......................................................................................2
Specications .................................................................................2
Components ...................................................................................2
Quick Start ......................................................................................3
Operation.........................................................................................4
Data Export .....................................................................................7
Manual
Control.............................................................................................8
Calibration.....................................................................................10
Spectral.....................................................................................10
Belt............................................................................................15
Software Setup .............................................................................16
Troubleshooting ...........................................................................20
Belt Adjustment .........................................................................20
Idler Adjustment ........................................................................21
Limit Switch...............................................................................21
Belt Speed ................................................................................22
Maintenance..................................................................................23
Warranty and Return Policy ........................................................24
Table of
Contents

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The natural gamma ray radiation emitted from rocks varies with the lithology.
The radiation comes from the radioactive decay of Potassium, Uranium, and
Thorium, which are present as trace elements. Shale typically contains more
of these elements than clean sandstone or limestone. Generally, formations
with higher shale content release more radiation.
A gamma ray well log is a recording of the natural gamma radiation of the
formation around the well bore and is almost always run in conjunction with
other well logs. Because the gamma ray log does not change with well treat-
ment or production, it can be used to correlate the depths of the other well
logs and the core gamma ray log from the same hole.
The OFITE Gamma Ray Core Logger measures the energy level and quan-
tity of the radiation emitted from a core sample and calculates the quantity of
each of the elements. The amounts of each of these elements and the total
gamma-ray count are then plotted as a function of depth.
To begin a test, the operator arranges the core samples onto the conveyor
belt in order of depth. The unit will record background radiation for 15 minutes
in order to establish a base reading. Then the conveyor belt pulls the samples
through the machine while the computer shows the results on the screen. At
the end of the test, the results are graphed and can be printed or exported.
The total gamma-ray log is also available.
Maximum Core Diameter: 6" (15.2 cm)
Maximum Belt Speed: 7 fpm (2.1 mpm)
System Dimensions: 23.6" × 47.2" × 118.1" (60 cm × 120 cm × 300 cm)
System Weight: 992 lbs (450 kg)
Gamma Ray Detector
Type and Size: NaI 3" × 3" (7.6 cm × 7.6 cm)
#120-00-033 Pillow Block Bearings, Qty: 3
#700-400-014 Conveyor Belt
#700-400-018 Photo Sensor, Qty: 2
#700-410-068 Calibration Gauge, Sample Size 4.5
#700-410-069 Calibration Gauge, Sample Size 2.375
#700-410-401 Calibration Standard, Potassium
#700-410-402 Calibration Standard, Thorium
#700-410-403 Calibration Standard, Uranium
#700-410-404 Calibration Standard, Background
#900-1908 Desktop Computer
#900-2202 Computer Monitor
Replacement Parts:
#700-400-017 Distance Sensor
#700-400-021 Motor
#700-410-001 Multi-Channel Analyzer
Introduction
Description
Components
Specications

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Quick Start 1. Always run a spectral calibration the night before running a Spectral Log
test. A spectral calibration is not necessary for the Total Gamma Log test.
2. Place the rst core on the belt directly under the sensor. Start with the
most shallow core rst. Orient the core so that the shallow end goes
under the shield rst.
3. Click the “Start Test” button on the Main Screen.
4. Enter the well information. This information will print on the well log at the
end of the test.
5. Enter the start and end depth.
6. Enter a le name and click OK.
7. Continue to load cores onto the belt.
8. Remove cores as they emerge from the shield. Be sure to replace the
core in the proper box and in the correct orientation.
9. When the last core sample has left the shield, click the “Stop” button.
If a core reaches the end of the conveyor, an electronic eye will stop the belt.
The software will continue to collect data and correct for the elapsed time.

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Operation Always run a spectral calibration the night before running a Spectral Log test.
A spectral calibration is not necessary for a Total Gamma Log test.
1. Place the rst core on the belt directly under the sensor. Start with the
most shallow core rst. Orient the core so that the shallow end goes
under the shield rst.
2. Click the “Start Test” button on the Main Screen.
3. Enter the well information. This information will print on the well log at the
end of the test.
4. Enter the start and end depth.
5. Enter a le name and click OK.
6. Continue to load cores onto the belt.
Make sure each core is properly aligned on the belt according to its depth
in the log. For example, if six inches are missing from the bottom of a
core, leave six inches of empty space on the belt between that core and
the next.
7. Remove cores as they emerge from the shield. Be sure to replace the
core in the proper box and in the correct orientation.
If a core reaches the end of the conveyor, an electronic eye will stop the
belt. The software will continue to collect data and correct for the elapsed
time.
8. When the last core sample has left the shield, click the “Stop” button.

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Log Header: This displays the information entered on the Start Test screen.
Drive Controls: These options provide manual control of the belt. Manual
control is disabled as soon as a test is started.
- Drive Mode:
- Position: Moves the belt a specied number of feet at maximum
velocity.
- Velocity: Moves the belt at the specied velocity until stopped.
- Vel (ft/min): The velocity of the belt when Drive Mode is set to Velocity.
- Pos (rel-ft): The distance to move the belt when Drive Mode is set to
Position.
- Execute: Check this box to begin moving the belt. Uncheck it to stop
the belt.

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Scan Type: These options specify what type of test to run.
- Total Gamma: The belt will move at one foot per minute and the
graph will only show total gamma.
- Spectral Gamma: The belt will move at one foot per ve minutes and
the graph will show both total and spectral gamma.
- Custom Scan: Allows you to specify a custom test.
- Average Time: The amount of time to accumulate data before
recording a data point.
- Vel (ft/min): The speed of the belt during the test.
Sensor Values:
Sample Height: Displays the height of the current core
Current Depth: Displays the calculated depth based on the start depth
entered at the beginning of the test
End of Travel Trip: Indicates the sensor at the end of the belt has been
triggered and the motor has stopped
Data:
Total Gamma (cps): Total gamma measurement (in Counts per Second)
Potassium (%): Concentration of Potassium in the sample
Uranium (ppm): Concentration of Uranium in the sample
Thorium (ppm): Concentration of Thorium in the sample
Plot Segment Settings:
O󰀨set: Move the slider to scroll to di󰀨erent points on the gamma log.
Window Size: Move the slider to show more or less data points on the
gamma log.
Pause: Check this box to pause the test. The unit will stop collecting data
and the belt will stop moving the samples.

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Data Export At the end of a test, the test data will automatically be saved in a le on the
computer hard drive. This le can then be imported into the Log Plot software
installed on the computer.
For more information, refer to the Log Plot documentation.
1. After the test is complete, open the Log Plot software.
2. Select “Open” from the “File” menu.
3. In the “Files of Type” eld select “Log Design (*.ldfx)”. Find the le
“Gamma Plot.ldfx” and open it.
4. Select “Open” from the “File” menu again.
5. Find the le “Form.dat” and open it.
6. Open Microsoft Excel and open the data le from the Gamma Ray Logger
software. The data le is located in the folder specied on the options
screen. See page 16 for details.
7. Select all of the data in the data le and copy it to the clipboard.
8. In the Log Plot software, click the form tab and paste the test data into the
form.
9. Click the “Compile a Log” button.
10. Enter the starting depth in the “Top of Interval” eld. Enter the ending
depth in the “Bottom of Interval” eld. Make sure the “Positive Depths”
eld is checked.
11. Click OK to compile the log.
Compile Log Button Form Tab

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Manual
Control
The Gamma Ray Logger can also be used to take manual measurements of
a single core sample.
1. Select “DigiBASE Manual Control” from the “Options” menu.
2. Place the core under the shield.
3. Click the “Start” button.
DigiBASE Info: This information comes from the DigiBASE scanner within
the Gamma Ray Logger. This information is for debugging purposes only.
DigiBASE Realtime: This information shows the current runtime parameters
for the DigiBASE scanner. This information is for debugging purposes only.
True Time: The scanner accumulates data over a specied period of time.
At the end of this interval, the data is recorded as a single data point and the
process starts over. This is called True Time. To set the True Time, enter a
value in this eld and click the “Set True Time” button.
High Voltage Setting: This is the amount of voltage being sent to the photo
multiplier.
Gain Fine: The amplier gain.
Get Versions: Populates the “DigiBASE Info” box

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Enable HV: Turns High Voltage mode on
Disable HV: Turns High Voltage mode o󰀨. When High Voltage mode is o󰀨,
the scanner will not collect any data.
Clear: Clears data from the graphs
Start: Starts logging data. Logging will stop at the end of the True Time
interval.
Stop: Stop logging data.
Standard: Choose a standard for a manual calibration.
Export Standard: Save the current data as a calibration for the selected
standard.

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The Gamma Ray Logger should be calibrated with spectral standards once
per month, or after the Gamma Ray Logger has been moved. Calibration
can also be done more frequently at the user’s discretion. During a spectral
calibration, the software automatically advances the conveyor belt and scans
each of three standards (Potassium, Uranium, and Thorium) for 10,000
seconds each. The total time for the procedure is about nine hours. We
recommend starting the test at the end of the day so that it can run overnight.
Always store the Gamma Ray Standards in the horizontal position. Do not
stand them up vertically.
The limit switch at the end of the conveyor belt is disabled during
calibrations. It will not stop the motor when a core reaches the end of
the belt. Before starting the calibration, make sure nothing is on the belt
between the shield and the limit switch.
Important Notice Concerning Calibration Standards: There is no globally
accepted industry standard or calibration methodology for gamma ray
standards for spectral gamma ray loggers. The OFITE Spectral Gamma
Ray standards are manufactured to the following concentrations: 100 ppm
Uranium, 100 ppm Thorium, and 4.5% Potassium. The standards are
manufactured in molecular proportions to achieve these concentrations. In
the event that this calibration standard does not meet desired requirements or
expectations, please contact OFITE.
1. Place the three standards on the belt with Potassium rst, then Uranium,
then Thorium. Place the Potassium standard centered under the shield
and leave 12 inches between the standards.
Shield Height Sensor
Calibration
Spectral

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2. In the Gamma Ray Logger software, select “Calibrate Spectrum” from the
“Utilities Menu”.
3. Click the “Accept” button. The software will scan each standard for 10,000
seconds and the automatically advance the belt to the next standard.
4. When the calibration is complete, click the “Save” button.

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Calibration Verication:
1. Run the Spectral Calibration. See page 11.
2. In the software, select “DigiBASE Manual Control” from the “Options” menu.
3. Place the Potassium standard (#700-410-401) on the belt centered under
the shield.
4. Set the True Time to 5 minutes and click the “Set True Time” button.
5. Click the “Clear” button.
6. Click the “Start” button.
7. When the test is complete, record the CPS and spectral value for the
standard.
8. Repeat steps 3 – 7 with the Uranium (#700-410-403) and Thorium (#700-
410-403) standards.
9. Refer to the chart below for acceptable results.
Standard CPS Min CPS Max Spectral Min Spectral Max
Potassium 5.6 7.64 3.24% 5.34%
Uranium 26.26 28.12 87.28 ppm 108.88 ppm
Thorium 11.8 13.18 84.85 ppm 109.39 ppm

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Live Log Spectral Test
To test the repeatability of standard readings in a live logging scenario:
1. Place the Potassium source one foot back from the center of the gamma
detector.
2. Place the Uranium source on the belt, leaving a one foot gap to the
Potassium source.
3. Change the scan mode to “Spectral Gamma”.
4. Start a new test. Name the le “Spectral Gamma Test”. Set the Start
Depth at 0’ and the End Depth at 10 feet.
5. Wait for the 15 minute background scan to complete.
6. As the belt starts moving, wait until there is su󰀩cient space on the belt to
place the Thorium standard while allowing a one foot gap to the uranium
standard.
7. Remove the standards from the belt as they near the limit switch at the
end of the belt. If the limit switch is triggered, the test will be suspended
and will not resume until the standard is removed.
8. When the test is complete, open the data le located under C:\Gamma
Logger Data\“Current Month “\” File Name”.
9. Record the reading for the Potassium, Uranium, and Thorium values.
These values should be near the 2 foot, and 6 foot depth values,
respectively.
Standard CPS
Acceptance
Criteria Spectral
Acceptance
Criteria Pass
Min Max Min Max
Potassium 5.6 7.64 3.24% 5.34%
Uranium 26.26 28.12 87.28 PPM 108.88 PPM
Thorium 11.8 13.18 84.85 PPM 109.39 PPM

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Export Standard
Manual Calibration
On the DigiBASE Manual Control screen you can run a manual calibration
on a single standard. Refer to page 8 for more information on the Manual
Control screen.
1. Select “DigiBASE Manual Control” from the “Options” menu.
2. From the drop-down menu, select the standard you want to calibrate
(Potassium, Uranium, Thorium or Gamma API).
3. Enter a value for True Time and click the “Set True Time” button. The
standard calibration time is 10,000 seconds (2 hours, 46 minutes, 40
seconds) per standard.
4. Place the standard under the shield.
5. Click the “Start” button to start logging.
6. When the True Time has elapsed, logging will stop automatically. Click the
“Export Standard” button to save the calibration.

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Calibration
Belt
The belt calibration is performed at the factory, however as the machine
ages and the belt stretches, it may be necessary to recalibrate the software
to account for the new length. To do this, the operator marks the belt and the
conveyor rail. The software advances the belt and then stops. The operator
then measures the distance the belt has traveled and records that value in
the software.
The limit switch at the end of the conveyor belt is disabled during calibrations.
It will not stop the motor when a core reaches the end of the belt. Before
starting the calibration, make sure nothing is on the belt.
1. In the software, select “Calibrate Belt”.
2. On the side of the belt opposite the limit switches, place a piece of tape
on the belt and place a piece of tape on the conveyor rail. Both pieces
should line up with each other.
3. Click the “Accept” button.
4. When the belt stops moving, measure the distance between the two
marks. The belt will travel approximately 6 feet.
5. Enter the value in the software and click the “Accept” button.

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Software
Setup
To change the software settings, select “Setup” from the “Options” menu.
DAQmx Device Name: The communication port for the scanner.
Drive Port: The communication port for the motor.
Distance Unit: Choose Feet.
Archive Path: Select a folder to save test data.
Limit Switch: The limit switch at the end of the conveyor belt will stop the
motor if a core passes through it during a test. To disable the limit switch,
uncheck this box. The limit switch is enabled by default.
The limit switch is disabled during both spectral and motor calibrations.
Before starting a motor calibration, make sure nothing is on the belt. Before
starting a spectral calibration, make sure only the three calibration standards
are on the belt and that none of them are between the shield and the limit
switch.

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Core Height Conversion:
The core height should be calibrated if the height sensor is replaced or the
height reading is wrong.
1. Click Options → Setup. Click the Height Sensor Calibration tab.
2. With nothing on the belt, enter 0 in the Standard #1 Height eld and click
the Measure #1 button.
3. Place the 4.5" Calibration Gauge (#700-410-068) under the scanner.
4. Enter 4.5 in the Standard #2 Height eld and click the Measure #2 button.
5. Click the Calculate button to save the calibration.
6. Place the 2.376" Calibration Gauge (#700-410-069) under the scanner.
The height should be 2.00" - 2.75". If not, repeat this procedure.

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The graph of the data can be customized to t your needs. Select “Plot
Setup” from the “Options” menu.
Y TickExt: The length of the tick marks on the Y-axis.
Grid Setup: The grids for Total Gamma (TGD), Potassium (K), Uranium (U),
and Thorium (Th) can be modied separately.
Left: Enter the distance (in pixels) from the left side of the screen.
Width: Enter the width (in pixels) of the graph.
Top: Enter the distance (in pixels) from the top of the screen.
Height: Enter the height (in pixels) of the graph.
X Count: Enter the number of tick marks you want on the X-axis.
X TickExt: The length of the tick marks on the X-axis.
Y TickExt: The length of the tick marks on the Y-axis.
Border: Select a border color.
X Grid: Select a color for the X-axis gridlines.
Y Grid: Select a color for the Y-axis gridlines.

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Scale: The Total Gamma (TG), Potassium (K), Uranium (U), and Thorium
(Th) scales can be modied separately.
Name: Enter the name of the graph.
Color: Select a color for the graph.
AutoScale Settings: The AutoScale Settings for the Depth, Total Gamma
(TG), Potassium (K), Uranium (U), and Thorium (Th) graphs can be changed
separately.
Greatest Min: The minimum value on the X-axis will scale to the lowest
data point on the graph or the Greatest Min value, whichever is lower.
Enter NaN to set it to the lowest data point on the graph.
Least Max: The maximum value on the X-axis will scale to the highest
data point on the graph or the Least Max value, whichever is higher. Enter
NaN to set it to the highest data point on the graph.
Nom Num of Increments: The number of increments on the Y-axis.