OfiTE 120-55 User manual
Benchtop HTHP Curing Chamber
Part No. 120-55
Instruction Manual
Updated 7/13/2018
Ver. 4.0
OFI Testing Equipment, Inc.
11302 Steeplecrest Dr. · Houston, Texas · 77065 · U.S.A.
Tele: 832.320.7300 · Fax: 713.880.9886 · www.ote.com
©Copyright OFITE 2015
OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ote.com 1
Intro..................................................................................................2
Description......................................................................................2
Components ...................................................................................2
Specications .................................................................................3
Setup................................................................................................4
Preparing the Slurry ....................................................................6
Operation.........................................................................................7
Termination .....................................................................................9
Maintenance..................................................................................10
Appendix ....................................................................................... 11
Fuses ........................................................................................ 11
Temperature Controller .............................................................12
Auto Cool ..................................................................................15
Rupture Disc .............................................................................16
Warranty and Return Policy ........................................................17
Table of
Contents
OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ote.com 2
The OFITE Benchtop HTHP Curing Chamber is designed to prepare
well cement specimens for compressive strength tests. It is necessary to
determine the amount of time required for a cement to develop compressive
strength so that drilling/production operations can be resumed as quickly as
possible. The goal is to design a slurry that can quickly develop compressive
strength so that the “waiting on cement” time may be minimized. The OFITE
HTHP Curing Chambers provide a means of curing cement specimens under
typical downhole temperatures and pressures.
Cement is poured into a special mold that produces specimens measuring
2" × 2"× 2". The mold is placed into the test cell and the pressure is increased
via an air-driven hydraulic pump. Test temperature is governed by a PID
temperature controller, which actuates the heater. After a predetermined
amount of time, the temperature of the test cell is reduced by the cooling
system. Specimens are removed and the compressive strength is determined
as outlined in API Specication 10.
#120-55-005 High-Pressure Filter
#120-55-006 Heater; Thinband; 1,650-Watt; 230-Volt; Qty: 2
#122-052 Rupture Disk; 5,500 PSI (37.9 MPa)
#122-083-1 Cement Mold Assembly, 4 Specimen
#152-38 AC Power Cord; 3-Conductor; International (Continental
European)
Optional:
#120-55-SP Spare Parts for Benchtop Curing Chamber
#120-55-003 Breaker, 16 Amp#120-55-006Heater, Qty: 2
#122-034 Needle Valve, 15K, Qty: 2
#122-052 Rupture Disk, 5,500 PSI, Qty: 2
#122-072 Fuse, 1 Amp, 5 mm × 20 mm, Qty: 8
#122-083-1 Cement Mold Assembly, 4 Specimen
Intro
Description
Components
OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ote.com 3
Specications Air Supply Maximum 150 PSI (1035 kPa)
Cooling Water Supply 40 PSI (276 kPa)
Readout Digital
Safety Features Pressure Relief Valve
Safety Head with Rupture Disk
Power Requirements 220 Volts, 50 / 60 Hz, 40 Amp
Weight 215 lb (94.6 kg)
Dimensions 25" × 16" × 20" (63.5 × 40.6 × 50.8 cm)
Shipping Weight 255 lbs (115.8 kg)
Shipping Dimensions 30" × 20" × 24" (76.2 × 50.8 × 61 cm)
Industry Standards API Specication 10, ASTM Standard C-109
Maximum Temperature / Pressure Combinations
Temperature °F (°C) Pressure PSI (kPa)
125 (51.7) 5,250 (36,200)
190 (87.8) 4,800 (33,096)
260 (126.7) 4,400 (30,338)
375 (191) 4,000 (27,600)
400.0 (204.4) 3,800 (26,201)
OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ote.com 4
Setup The Benchtop Curing Chamber consists of two modules. The Cell Module
houses the test cell, heaters, and pressure ttings. The Control Module
houses all of the electronic controls and the timer.
1. Carefully remove both modules from the crate.
2. Make sure the “Fill Cell”, “Air to Cylinder”, and “Pressure Release” valves
are closed (turned fully clockwise).
3. Connect a Nitrogen supply (690 – 1,035 kPa or 100– 150 PSI), a water
supply, and a drain line to the designated ¼" (6.35 mm) ports on the back
of the Cell Module.
4. Plug the data cable into the designated ports on the two modules.
5. Plug the thermocouple into the Thermocouple Port on the top of the Cell
Module. Plug the temp data cable (male on both ends) into the Temp Data
Port on the top of the Cell Module. Plug the other end of the cable into the
designated port on the back of the Control Module.
Thermocouple Port
Temp Data Port
6. Make sure all of the switches on the control module are off. Plug the unit
into a grounded electrical outlet.
7. Turn the “Main” switch on.
OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ote.com 5
Control Module Control Module
Control Module:
Main Switch - Provides power to the entire unit.
Pump Switch - Provides power to the pump.
Heat Switch - Provides power to the heaters.
Timer Switch - Provides power to the timer.
Auto Cool Switch - Automatically begins cooling at the end of the test.
Sonalert Switch - During an alarm condition, the unit will beep only if this
switch is on.
Cool Switch - Manually begins cooling.
Alarm Switch - If this switch is on, the unit will enter an alarm condition
when the temperature exceeds 400°F (200°C).
Temperature Controller - Controls the temperature in the test. (See
page 12 for instructions)
Timer - Displays the current duration of the test and controls the Auto
Cool function. (See page 15 for instructions)
Cell Module:
Pressure Gauge - Displays the pressure inside the test cell.
Regulator - Controls the pressure inside the test cell. Turn it clockwise to
open and counter-clockwise to close.
Fill Cell Valve - Allows the cell to ll with water, which adds pressure.
Air to Cylinder Valve - Pumps air into the cell to displace the water and
allow it to drain.
Pressure Release Valve - Releases pressure from the cell.
Temperature
Controller
Timer
OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ote.com 6
Setup
Preparing the Slurry
It is very important to begin a test as soon as possible after preparing the
cement slurry. Before the slurry is prepared, make sure the unit is ready
to begin a test. If a custom temperature prole is being used, program the
temperature controller (see page 12 for instructions) rst before mixing the
cement.
1. Spread a thin coat of grease on all interior surfaces of the cement molds
(#122-083-1). This will make it easier to remove the cement after the test.
2. Prepare the cement slurry according to API Specication 10.
3. Fill half of each mold with the prepared slurry.
4. With a puddling rod, tap the bottom inside of the cement mold to remove
any trapped air bubbles.
5. Stir the remaining slurry and ll each mold to overowing.
6. Puddle each specimen to remove any trapped air bubbles.
7. Using a straight edge, scrape the excess slurry from the top of each
specimen to make them level.
8. Attach the top plate and secure it in place with the screws provided.
Cement Molds
OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ote.com 7
Operation Before beginning a test, make sure all switches are in the off position and all
valves are closed.
1. Loosen all eight set screws on the cell cap with a torque wrench.
2. Unscrew the cell cap and remove it from the cell.
3. Prepare the cement slurry as described on page 6. Carefully lower the
cement molds into the test cell.
4. Remove the handle from the mold.
5. Lubricate the threads of the cell cap with high-temperature thread
lubricant (#165-44).
6. Place the cell cap back onto the cell and screw it in place hand tight. Be
careful not to damage the seal rings and the cap itself.
7. Tighten all the set screws on the cell cap by hand.
8. Adjust the supplied torque wrench to 90 inch-pounds. Tighten the rst
screw until the torque wrench clicks. Skip four screws and tighten the fth
until the torque wrench clicks. Continue in this manner, tightening every
fth screw until all eight have been tightened.
9. Now adjust the torque wrench to 180 inch-pounds and tighten all of the
set screws as described in the previous step.
The cap must be tightened consistently and uniformly every time to
create a good seal.
10. Loosen the thermocouple compression tting in the center of the cell cap.
Insert the thermocouple through the compression tting. Tighten the tting
nger tight and then loosen it ⅛ of a turn.
11. Make sure the “Air to Cylinder” and “Pressure Release” valves are closed.
Turn the “Regulator” completely counter-clockwise.
12. Turn the “Pump” switch on.
13. Open the “Fill Cell” valve. Water will ow into the test cell and the
displaced air will be forced out through the loosened thermocouple
compression tting.
14. Keep a ⅝" wrench handy and watch the top of the cell. When water
begins to ow from the compression tting, tighten it with the wrench. This
will ensure that no air remains in the cell.
OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ote.com 8
15. Set the pressure in the test cell by turning the “Regulator” clockwise
until the gauge reads the desired pressure. If the pressure rises too
high, slowly open the “Pressure Release” valve. When the pressure has
dropped, close the valve.
Always release the pressure very slowly to avoid pulling cement into the
plumbing.
16. Set the temperature controller on the Control Module to the desired
temperature.
The temperature controller features both manual and automatic operating
modes. To use the manual mode, simply use the up and down arrows to
set the test temperature. To use the automatic mode, refer to page 12
for instructions.
17. Turn on the “Heater” switch.
18. Turn the “Sonalert” on to be notied of an alarm condition.
19. Program the set points on the timer and press the “F1/RST” button. See
page 15 for more information.
OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ote.com 9
Termination When the test is complete, the cement slurry will be fully cured. The system
must be shut down very carefully to avoid injury or damage to equipment.
1. Turn the “Heat” switch off.
2. If “Auto Cool” is off, turn on the “Cool” switch. This will begin circulating
water through the test cell.
3. When the temperature in the cell drops below 180°F (80°C), turn off the
pump and slowly open the “Pressure Release” valve.
Do not attempt to release the pressure until the temperature is below
180°F (80°C).
Always release the pressure very slowly to avoid pulling cement into the
plumbing.
4. Close the “Fill Cell” valve.
5. Slowly open the “Air to Cylinder” valve. This will force the water out of the
cell and into the drain line. When air starts escaping from the drain, close
the “Air to Cylinder” valve.
6. Make sure the pressure gauge reads 0. Slowly loosen the thermocouple
compression tting and remove the thermocouple.
7. Loosen the screws on the cell cap. Unscrew the cap and remove it from
the cell. Remove the cement molds from the cell and allow them to cool
as directed in API Specication 10.
8. Put the cell cap back on the cell to prevent dust and debris from settling
inside. Close all valves and turn all switches off.
Table of contents
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