OfiTE 120-57 User manual

Gas Migration Tester
#120-57 - 115 Volt
#120-57-1 - 230 Volt
Instruction Manual
Updated 3/25/2020
Ver. 3
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 2015

OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: [phone] / Fax: [phone] / www.ote.com 1
Introduction.....................................................................................2
Description......................................................................................2
Specications .................................................................................3
Components ...................................................................................4
Installation.......................................................................................6
Setup................................................................................................7
Software ..........................................................................................9
Setup...........................................................................................9
Operation ..................................................................................10
Calibration................................................................................. 11
Assembly ......................................................................................14
Setup.........................................................................................14
Test Cell ....................................................................................15
Installing the Test Cell ...............................................................20
Testing ...........................................................................................22
Starting the Test ........................................................................22
Completing the Test ..................................................................23
Removing Cement from the Cell...............................................26
Cell Diagram .............................................................................27
Warranty and Return Policy ........................................................28
Table of
Contents

OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: [phone] / Fax: [phone] / www.ote.com 2
The problems of gas migration after cementing operations have been well
documented. The costs associated with these problems, as well as stricter
environmental regulations, have forced gas well operators to look for
methods to minimize gas migration.
The OFITE Gas Migration Tester helps predict and overcome the potential
for gas migration after cementing. This unit evaluates both the potential and
severity of gas migration at downhole conditions with the recommended
slurry. This allows for the design of the most economical and reliable cement
slurry for a particular well.
A test cell is lled with a cement slurry and placed into a heating jacket. The
test cell is tted with a piston above the slurry and a screen below. A back
pressure regulator below the test cell applies back ow pressure. Hydrostatic
pressure is applied to the piston and nitrogen/gas pressure is applied through
the piston tubing and onto the cement slurry. As the slurry hardens, if the
cement is sufciently permeable, the nitrogen pressure will force the gas
through the back pressure regulator to be collected and measured. Both
ltrate and gas volume are collected.
Introduction
Description
Inlet Cap
Cell
Piston
Screen
Cement
Cement
N2Gas - 500 PSI
(3,447.5 kPa)
To Computer
Pressure Transducer
Hydrostatic / Overburden
Pressure 1,000 PSI
(6,895 kPa)
To Computer
Pore Pressure Transducer
Back Pressure
300 PSI (2,068.5 kPa)
Back Pressure Regulator
Filtrate

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Specications - Maximum Temperature: 400°F (204.4°C)
- Maximum Pressure: 2,000 PSI (13,790 kPa)
- Crated Size: 43" × 36" × 48" inches (109.2 × 91.4 × 121.9 cm)
- Crated Weight: 469 lb (212.7 kg)
- Voltage: 115 / 220 Volts
- Requires 1,000 PSI (6,895 kPa) Nitrogen Supply

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Components #120-57-07 Pressure Sensor, 0 - 2,500 PSI (0 - 17,350 kPa)
#130-76-03 Thermocouple, Qty: 2
#153-67 Syringe, Disposable, 60 cc, Qty: 4
#154-63 Spatula, Micro Spoon, 9" Flat Handle
#165-14-8 Thermocouple, Type “J”, ⅛" × 6"
#170-17 O-ring for Valve Stem
#170-18 Removable Cement Screen, 325 Mesh with 60 Mesh Backup
Optional:
#120-57-SP Spare Parts for #120-57:
#120-57-01 Screen, 325 Mesh, Qty: 20
#120-57-02 Screen, 60 Mesh, Qty: 10
#120-57-03 Piston Seal, Qty: 6
#120-57-04 O-ring for Screen, Qty: 6
#120-57-05 Rod Seal, Qty: 6
#120-57-06 Packing Grease, Qty: 3
#153-67 Syringe, Disposable, 60 cc, Qty: 6
#170-13-3 O-ring for Test Cell, Viton, Qty: 24
#170-17 Valve Stem O-ring, Qty: 12
#170-18 Removable Cement Screen, 325 Mesh with 60 Mesh
Backup, Qty: 6
#171-90-09 Valve Stem, Filtrate Outlet, Qty: 2
#120-57-21 Knock Out Tool
#120-910-057-RK Repair Kit for Back Pressure Regulator

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LVDT
(Displacement
Transducer)
Test Cell
Assembly
Pressure
Transducer
Thermocouple
Pressure
Relief Valve
Backow
Pressure
Nitrogen/Gas
Pressure
Hydrostatic
Pressure
Thermocouple
Heating Jacket
Valve Stem
Top Filtrate Drain
Back Pressure
Regulator
Beaker
Filtrate Flask
Water Collection
Flask
Coolant Supply
Valve
Load Stands

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Installation 1. Carefully remove the unit from the packing crate and place it on a stable
counter top or table.
2. Plug the AC power cord into an appropriate outlet.
3. Connect a nitrogen air supply (at least 1,000 PSI) to the back of the unit
via the top ¼" female NPT port.
4. The Coolant In and Coolant Out ports on the back connect to plumbing
that circulates around the heating jacket. The cell can be cooled with
either tap water or a chiller. Both ports are ¼" NPT.
5. Connect the PC to the unit with a serial cable.
6. Turn the “Main Power” switch on.

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Setup Before beginning a test, the cement slurry should be fully conditioned
according to API specications. While the cement is conditioning, begin
preparing the equipment for the test. The test should begin no more than ve
minutes after the cement is conditioned.
1. Make sure all valves on the unit are closed.
2. Make sure all three regulators are closed by turning them fully counter-
clockwise.
3. Turn on the “Main Power” switch and wait for the PC to boot.
4. Connect the back pressure regulator to the “Backow Pressure” port on
the unit cabinet via the quick-connect hose.
5. Attach the tube to the back pressure regulator and feed it through the hole
in the unit cabinet.
Valve Stem
Back Pressure RegulatorBackow Pressure
6. Inside the cabinet, connect the tube from the back pressure receiver to
the inow (curved) port on the rst rubber stopper. Insert the rst rubber
stopper into the mouth of the ltrate ask and place the ltrate ask on the
left load stand.
7. Fill the second ask with 1,000 mL water and insert the second rubber
stopper. Connect another rubber tube from the ltrate ask to the water
collection ask and set the water collection ask next to two load stands.

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8. Place the overow from the water collection ask into the beaker and set
the beaker on the right load stand.
Make sure the rubber stoppers form a tight seal.
This setup allows the unit to automatically measure the ltrate and gas
volume collected during the test. Both the ltrate and the nitrogen gas
will be captured by the back pressure receiver. From there, it is emptied
into the ltrate ask. The ltrate will then be weighed by the load stand,
while the gas will be pushed into the water collection ask. In the water
collection ask, the gas displaces the water and pushes it into the beaker
where it is weighed by the load stand.
Since the density of water is 1 g/mL, the weight (in grams) of the
displaced water corresponds to the volume of nitrogen gas that has
migrated through the cement.
9. Return to the computer screen and wait for the “Filtrate Volume” and “Gas
Volume” values to stabilize. Zero both of these values.
Overow
Beaker
Load Stand
Water Collection Flask
Load Stand

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1. Open the software by double-clicking the icon on the desktop.
2. From the “Utilities” menu choose “Setup”.
DAQ Time: Determines how often the data le is updated.
Pressure Unit: Choose either PSI or MPa.
Temp Unit: Choose either Deg F or Deg C.
Distance Unit: Choose either Millimeter or Inches.
Archive Path: The location of the data le.
Print to Printer: At the end of the test, the software will automatically
generate an image le of the graph. If the “Print to Printer” box is
checked, this graph will automatically be printed to the default printer.
3. Click “OK” to save changes.
Software
Setup

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Software
Operation
Before starting the test, it is important to prepare the software for testing.
1. Open the software by double-clicking the icon on the desktop.
2. From the “Utilities” menu, select “Load Sample Infos”. Give the test a
name. The name will print on the graph at the end of the test. The rest of
the elds on this screen are optional and are for display only.
3. Click “OK” to save the changes.

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Software
Calibration
1. From the “Edit” menu, choose “Calibration”. The following elds make up
the calibration screen:
Variable: Selects which device is being calibrated.
Value Low: The low value in the calibration
Value Hi: The high value in the calibration
Sig. Lo: The signal value corresponding to Value Low.
Sig. Hi: The signal value corresponding to Value Hi.
Raw Value: The value currently being sent by the equipment.
Low (Button): Copies the Raw Value into the Sig. Lo. eld.
High (Button): Copies the Raw Value into the Sig. Hi. eld.
Store Cal: Stores the calibration values in memory.
2. Choose the device to be calibrated from the “Variable” drop-down list.
a. Sample Temp and Cell Temp
i. Before calibrating either temperature, set the temperature units to
°C. Refer to page 2 for instructions.
ii. Insert the thermocouple into a calibrating block. Make sure the
thermocouple is plugged into the appropriate port.
iii. Set the calibrating block to 0°C. Refer to the documentation
provided with the calibrating block for instructions.
iv. Enter the reading from the calibrating block into the Value Low
eld. Once the Raw Value has stabilized, click the “Low” button.
v. Set the calibrating block to 200°C.
vi. Enter the reading from the calibrating block into the Value Hi eld.
Once the Raw Value has stabilized, click the “High” button.
vii. Click the “Store Cal” button to save the calibration data.

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b. Filtrate Volume and Gas Volume
i. Remove all weight from the specied load balance inside the
machine. The Filtrate Volume is measured on the left-hand side
and the Gas Volume is measured on the right-hand side.
ii. Enter 0 in the Value Low eld. Once the Raw Value has
stabilized, click the “Low” button.
iii. Now place a 500g weight on the load balance.
iv. Enter 500 in the Value Hi eld. Once the Raw Value has
stabilized, click the “High” button.
v. Click the “Store Cal” button to save the calibration data.
c. Piston Location
i. Before calibrating the piston location, set the Distance Units to
mm. Refer to page 9 for instructions.
ii. Turn the LVDT so that the transducer rod is touching the heating
jacket.
iii. Lower the LVDT all the way down.
iv. Enter 0 in the Value Low eld. Once the Raw Value has
stabilized, click the “Low” button.
v. Now raise the LVDT up 50 mm.
vi. Enter 50 in the Value Hi eld. Once the Raw Value has stabilized,
click the “High” button.
vii. Click the “Store Cal” button to save the calibration data.
d. Back Pressure, Over Pressure, and Nitrogen Pressure
i. Release all pressure from the system.
ii. Enter 0 in the Value Low eld. Once the Raw Value has
stabilized, click the “Low” button.
iii. Connect a calibrated gauge to the appropriate pressure outlet on
the unit case. For calibrating Over Pressure, connect the gauge to
the “Hydrostatic Pressure” outlet.

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iv. Increase the appropriate pressure. For calibrating the Nitrogen
Pressure, increase the pressure to 1,000 PSI. For calibrating the
Back Pressure, increase the pressure to 400 PSI. For calibrating
the Over Pressure, increase the pressure to 550 PSI.
v. Enter the reading from the calibrated gauge into the Value Hi eld.
Once the Raw Value has stabilized, click the “High” button.
vi. Click the “Store Cal” button to save the calibration data.
e. Pore Pressure
i. Release all pressure from the system.
ii. Enter 0 in the Value Low eld. Once the Raw Value has
stabilized, click the “Low” button.
iii. Assemble the test cell with water instead of cement.
iv. Connect a calibrated gauge to the Relief Valve near the pressure
transducer.
v. Open the Pressure Relief Valve.
vi. Increase the Nitrogen Pressure to 1,000 PSI.
vii. Enter the reading from the calibrated gauge into the Value Hi eld.
Once the Raw Value has stabilized, click the “High” button.
viii. Click the “Store Cal” button to save the calibration data.

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Assembly
Setup
Before assembling the test cell, make sure the xtures on the side are
adequately greased. This will prevent cement slurry from hardening inside the
xtures and damaging the parts.
1. Unscrew the transducer assembly and completely ll the space inside
with high-temperature grease. Replace the transducer, then open the
relief valve and ll the remaining space. Close the relief valve.
2. Remove the thermocouple and inject the grease directly into the xture.
3. Replace the thermocouple.
To verify that enough grease has been used, look into the cell and
observe the two holes on the side. You should be able to see grease
overowing the two xtures into the test cell. Wipe any excess grease
from the inside of the cell.
Grease
Transducer
Assembly
Thermocouple
Transducer
Syringe
Thermocouple
Fixture

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Assembly
Test Cell
During the assembly process, be sure to coat all o-rings and seal rings (any
part made of rubber) with grease. This will make it easier to remove the
cement slurry when the test is complete.
1. Assemble the piston head.
a. Insert an o-ring into the o-ring groove in the bottom of the Piston.
b. Place the screens inside the bottom of the piston, over the o-ring. The
screen with the tighter mesh goes on the outside.
c. Screw the brass retainer ring in place, securing the screen and o-ring.
Do not over tighten.
Piston Head
O-ring Retainer Ring Screen
2. Assemble the inlet cap.
a. Place the seal plug into the hole in the bottom of the inlet cap. Be sure
to press it all the way down inside the hole.
b. Screw the brass seal plug locking ring in place, securing the seal plug.
Do not over tighten.
c. Place an o-ring in the groove around the bottom edge of the cap.
Inlet Cap
O-ring Seal Plug Seal Plug Locking Ring

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3. Slide the inlet cap onto the piston rod. The threads on the piston rod
can damage the seal plug. To avoid this, twist the inlet cap in a screwing
motion until it is past the threads.
4. Slide the top portion of the Autoclave F250C connector onto the piston
rod above the inlet cap.
5. Screw the bottom portion of the Autoclave F250C connector onto the
threaded portion of the piston rod. Leave about ¼" space between the
connector and the end of the rod.
O-ring
Autoclave F250C
Connector (Bottom)
Autoclave F250C
Connector (Top)
Piston Rod
Inlet Cap
Seal Plug Locking Ring
6. Place an o-ring into the groove inside the spacer. Then place the spacer
onto the piston rod with the o-ring facing the inlet cap. After the spacer,
place the seal ring screw, o-ring, seal ring, and o-ring onto the piston rod.
Refer to the photo below.
O-ring
(#120-910-034)
Seal Ring
(#120-57-03)
Spacer
(#170-72)
O-ring
(#170-77)
Inlet Cap
(#120-57-11)
Piston
(#120-57-13)
O-ring
(#120-910-034)
Seal Ring Screw
(#120-57-14)
Piston Rod
(#120-57-15)
O-ring
(#170-13-3)
Male Connector Fitting,
¼" × 9/16"-18
(#120-57-022)

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7. Screw the piston rod into the piston head.
Piston Spacer
8. Slide the o-ring and seal ring onto the piston and secure them with the
seal ring screw.
9. Place an o-ring into the groove inside the top of the test cell.
10. Press the spacer down around the top of the piston. Then slide the piston
assembly into the top of the test cell. The spacer will stay at the top while
the piston will continue to go down into the cell.
Piston Rod
Locking Ring
Inlet Cap
Test Cell
11. Push the piston, locking ring, and inlet cap down into the cell as far as
possible. Place the locking ring around the inlet cap and screw it into
place. Tighten the locking ring.

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12. With the piston in place, carefully remove the locking ring and inlet cap
so that you can ll the space with oil. Bring the inlet cap to the top of the
piston rod and pour oil into the space covering the o-ring groove in the
test cell. Bring the inlet cap back down and screw the locking ring into
place. Oil should come out of the hydrostatic pressure port. Cap both the
hydrostatic port on inlet cap and the nitrogen port on the piston rod to
prevent oil from leaking out.
13. Turn the cell over and pour in the cement slurry. Fill the cell to within ⅛"
of the o-ring groove. Refer to API Specication 10 for more information
about preparing the slurry.
Be careful not to rest the weight of the cell on the valve stem. Instead,
set the cell on the provided cell stand. This will protect the plumbing and
provide a stable platform to support the cell. Keep the piston rod secure
to prevent the piston connector from becoming loose.
Test Cell
Cell Stand

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14. Place an o-ring into the groove inside the bottom of the test cell.
15. Place the screen on top of the o-ring with the at side facing down.
16. Place another o-ring on top of the screen.
17. Screw the bottom cell cap into the cell and tighten completely.
18. Screw the valve stem into the hole in the bottom of the cell cap. Make
sure the valve is closed by tightening it completely with a wrench.