OfiTE 150-50 Manuale utente
Dierential Sticking Tester
Part No. 150-50
Instruction Manual
Updated 11/28/2023
Ver. 4
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 2013
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 ...................................................................................3
Safety ...............................................................................................5
Test Procedure ...............................................................................6
Timed Filtration ...........................................................................6
Disassembly ................................................................................. 11
Theory............................................................................................12
Example ....................................................................................14
Worksheet.................................................................................15
Maintenance ..................................................................................16
Diagrams .......................................................................................17
Full Unit.....................................................................................17
Cell Assembly ...........................................................................18
Warranty and Return Policy ........................................................19
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 Dierential Sticking Tester measures the “Stuck Pipe Tendency
Coecient” of drilling uids, and also determines how eective lubricants or
treatments might be with any given drilling uid. This coecient takes into ac-
count both the friction, or “stickiness”, of the lter cake, as well as the amount
of cake building that must occur in order to freeze or stick the pipe in the hole.
The coecient is determined by running a Timed Filtration test. By measuring
the area of cake building during a test, the “Bulk Sticking Coecient” is ob-
tained and read directly at the conclusion of the test. How likely a given uid
will be to produce a stuck pipe situation and how eective a given treatment
may be, can be immediately determined on-site.
The unit is normally pressurized by a CO2 pressuring assembly, but any
nitrogen source will also work. If nitrogen is used, the tester apparatus must
be tted with a suitable nitrogen regulator, gauges, valves, and high-pressure
hoses. The standard test uses 477.5 PSI (3,291 kPa) applied to a 200-mL
stainless steel vessel. The unit includes both a at-faced plate and a plate of
12½" (31.75 cm) spherical radius, which simulates the pipe inside the casing
or collars in the borehole. For samples that adhere more to the plate than to
the lter paper, stainless steel micro-corrugation disks are provided. For con-
venience a stainless steel carrying case is available as an optional item.
Intro
Description
OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ote.com 3
Components #130-10-52 Jam Nut, 3/8-24, Qty: 2
#142-56 O-ring
#150-52 Neoprene Gasket
#150-53 Plastic Gasket
#150-54 Torque Wrench
#150-55 Spanner Wrench
#150-56 Test Cell O-ring
#150-57 5⁄1 6 " Socket with ⅜" Drive
#150-58 Torque Plate, Flat Bottom
#150-59 Torque Plate, Spherical
#153-16 Glass Graduated Cylinder, 25 mL × 2⁄1 0 mL
#170-04 CO2 Pressurization Unit:
#143-02-10 CO2 Puncture Head Assembly
#143-03 Barrel for CO2 Cartridge
#170-08 Regulator
#170-20 Manifold Block
#170-32 ⅛" × ⅛" NPT Male Needle Valve
#171-22 Retainer Pin
#171-34 1500-PSI Gauge, 2", ¼" NPT Bottom
#170-13-3 Test Cell O-ring, Viton 75D
#170-15 Base
#170-16 Valve Stem, Qty: 2
#170-17 Valve Stem O-ring, Qty: 10
#170-19 2½" (6.35 cm) Filter Paper, Specially Hardened for Filter
Presses
#170-35 6" Adjustable Wrench
#170-44 ½" Rubber Foot, Qty: 4
#171-79 ¼" Hex Wrench
OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ote.com 4
Optional:
#150-50-SP Spare Parts for #150-50:
#142-56 O-ring, Qty: 12
#143-02-13 O-ring for Puncture Pin Holder Assembly, CO2 Cartridge,
Qty: 4
#143-02-14 O-ring for Puncture Pin Holder Assembly, Qty: 4
#143-05 EZ Puncture CO2 Bulbs, 8-Gram, UN #1013, Package of
10, Qty: 20
#143-07 Regulator Repair Kit for #143-00
#143-22 Gasket for Puncturing Pin, Qty: 6
#150-51 Locking Mesh Disc, Qty: 10
#150-52 Neoprene Gasket, Qty: 10
#150-53 Plastic Gasket, Qty: 8
#153-16 Glass Graduated Cylinder, 25 mL × 2⁄1 0 mL, Qty: 2
#170-13-3 Test Cell O-ring, Viton 75D, Qty: 4
#170-16 Valve Stem, Qty: 2
#170-17 Valve Stem O-ring, Qty: 20
#170-19 2½" (6.35 cm) Filter Paper, Specially Hardened for Filter
Presses, Qty: 5
#170-23 60-Mesh Screen, Qty: 4
#171-23-1 Safety Pin with Lanyard
#171-79 Hex Wrench, ¼"
OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ote.com 5
Safety Nitrogen must be supplied in an approved Nitrogen Gas Cylinder and se-
cured to meet safety standards. Do not use nitrous oxide cartridges as pres-
sure sources.
Due to the high pressures involved in this test, extreme care must be exer-
cised at all times. All safety precautions must be met, especially in the cell
breakdown procedure after the ltration procedure has been completed.
Never transport CO2 bulbs or cartridges by airplane without proper packag-
ing. Cabin depressurization could cause them to explode.
Before pressuring, always check to be sure the regulator is in a closed posi-
tion by ensuring the T-screw is backed out and free turning. Insert and punc-
ture the CO2 cartridge by turning the barrel only a quarter turn past the actual
puncture point. Adjust the regulator to the desired pressure with the regulator
T-screw. With the Dierential Sticking Tester, never exceed 500 PSI (3,450
kPa). When depressurizing, shut o the pressure supply, then bleed o the
system of pressure with the valve, and nally back out the regulator T-screw.
OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ote.com 6
Test
Procedure
Timed Filtration
Two torque plates are provided with the unit. The spherical torque plate
(#150-59) has a very slight curve on the bottom. The radius of the curve is
12.5" (31.75 cm) and simulates a 25" (63.5 cm) diameter drill casing or collar.
The at torque plate (#150-58) is completely at across the surface. The dif-
ference between the two is sometimes dicult to see. To distinguish between
the two, place them next to each other on a at surface. The spherical torque
plate will rock slightly, while the at torque plate will sit rmly.
1. Make sure the unit is clean and dry before beginning a test.
2. Open the test cell. Remove the inner cap by turning the cell over and
removing the two allen screws with the supplied wrench.
3. Inspect the o-ring on the bottom of the inner cap. Replace it if it shows
signs of wear or damage.
Allen Screws O-ring
Inner Cap
Cell Bottom Inner Cap - Bottom Inner Cap - Top
Cell - Inside Retaining Ring
OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ote.com 7
4. Place a sheet of lter paper on top of the screen on the inner cap. On top
of the lter paper, place the rubber gasket, then the plastic ring.
The locking mesh disk can be used to lock the lter cake to the paper so
that it does not stick to the torque plate face and break lose from the lter
paper. If you choose to use the locking mesh disk, place it on top of the
lter paper, beneath the rubber gasket.
5. Screw the retaining ring in place on top of the lter paper and gaskets. Be
sure to keep the gaskets centered.
6. Place the inner cap back into the cell. Make sure the o-ring seats properly
beneath the inner cap. Refer to the photos on page 8.
7. Turn the cell over and secure the inner cap with the two allen screws.
8. Tighten the retaining ring securely with the supplied retainer wrench.
9. Inspect the o-rings on the valve stems and replace any that show signs of
wear or damage. Screw one of the valve stems into the hole in the base
of the test cell and hand tighten.
Retainer Wrench (#150-55)
Retaining Ring (#150-50-002)
Plastic Gasket (#150-53)
Neoprene Gasket (#150-52)
Locking Mesh Disk (#150-51)
Filter Paper (#170-19)
Inner Cap with Screen
(#150-50-009)
OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ote.com 8
10. Place the cell on the stand. Make sure the four holes in the base of the
cell line up with the stand tips.
11. Fill the cell with sample uid to the scribed line.
12. Insert the stem of the torque plate through the hole in the cell cap as far
as possible. The face of the plate should be facing towards the inside of
the cell. Be careful not to cut the o-ring.
13. Screw the cell cap onto the test cell body. Make sure the o-ring is properly
seated in the groove in the cell cap.
14. Tighten the cell cap using the supplied spanner wrench. For additional
leverage, place the lever arm horizontally between the two support legs.
Once the cell cap is tightened, rotate the cell on the stand until the valve
stem hole is oriented away from the stand supports. This will provide
more space for the torque lever.
Torque Plate
O-ring
Cell Cap
Torque Plate
Spanner Wrench Lever Arm
OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ote.com 9
15. Screw the other valve stem into the hole in the cell cap and hand tighten.
16. Place the CO2 assembly onto the top valve stem and secure it in place
with the retaining pin.
17. Unscrew (counter-clockwise) the regulator T-screw until it turns freely.
18. Remove the barrel from the regulator. Place a CO2 cartridge into the bar-
rel and tighten the barrel to the puncture head until the cartridge punc-
tures.
19. Tighten (clockwise) the regulator T-screw until the gauge reads 477.5 PSI
(3,292 kPa).
20. Place the 25 mL graduated cylinder under the cell and open the lower
valve stem by turning it counter-clockwise ¼ turn.
21. Make sure the torque plate is up as far as possible by turning and pulling
it upward.
22. Open the top valve stem ¼ turn to initiate ltration. Record the time of the
start of the test.
23. Continue ltration for 10 minutes, or until the desired ltrate volume is col-
lected.
24. Align the groove in the lever under the column top cross support and
press the torque plate down into the cell. Continue to hold the torque
plate all the way down against the screen until the pressure equalizes
suciently to allow the plate to stick. This usually takes about two minutes
and will require 50 to 80 pounds (23 to 36 kg) of force on the end of the
lever.
Lever Arm
Torque Plate Stem
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