OFITE 150-50 Differential Sticking Tester

Product Information

Specifications

• Part No.: 150-50
• Instruction Manual Version : 4

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 5/16 Socket with Drive

• 150-58 Torque Plate, Flat Bottom

• 150-59 Torque Plate, Spherical

• 153-16 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 Retainer Pin

  • 171-22 Test Cell O-ring, Viton 75D

  • 171-34 Base

  • 170-16 Valve Stem, Qty: 2

  • 170-17 Valve Stem O-ring, Qty: 10

  • 170-19 Presses

  • 170-35 6 Adjustable Wrench

  • 170-44

  • 171-79

Safety
Nitrogen must be supplied in an approved Nitrogen Gas Cylinder and secured to meet safety standards. Do not use nitrous oxide cartridges as pressure sources. Due to the high pressures involved in this test, extreme care must be exercised at all times. All safety precautions must be met, especially in the cell breakdown procedure after the filtration procedure has been completed.

Product Usage Instructions

Timed Filtration
The timed filtration procedure is used to measure the differential sticking characteristics of a drilling fluid sample. Follow these steps

1. Prepare the test cell by assembling the necessary components, including the test cell O-ring, valve stem, and valve stem O-ring.
2. Place the sample in the test cell.
3. Securely fasten the test cell with the torque plate.
4. Connect the CO2 pressurization unit to the test cell.
5. Pressurize the test cell with CO2 gas according to the specified pressure and duration.
6. Start the timer and record the time it takes for the fluid to pass through the screen.
7. Repeat the test with different samples or conditions if necessary.

Disassembly
Disassemble the test cell and clean it after each use to ensure accurate and reliable results. Follow these steps

1. Release the pressure from the test cell by carefully venting the CO2 gas.
2. Remove the torque plate using the spanner wrench.
3. Disconnect the CO2 pressurization unit from the test cell.
4. Carefully remove the test cell from the apparatus.
5. Clean all components thoroughly using an appropriate cleaning solution.
6. Inspect all components for any signs of damage or wear.
7. Reassemble the test cell before the next use.

Theory
The theory behind the differential sticking tester is based on the differential pressure created when a drilling fluid sample is subjected to filtration through a screen. This pressure difference can indicate the sticking characteristics of the fluid and its propensity to cause differential sticking in the wellbore.

Example
An example of the test results and calculations can be found in this section. It provides a practical demonstration of how to interpret the data obtained from the timed filtration procedure.

Worksheet
The worksheet section provides a template for recording the test results, including the time taken for filtration, sample details, and any additional notes or observations.

Maintenance
Proper maintenance of the differential sticking tester is crucial for accurate and reliable results. Follow these guidelines

• Clean all components after each use to remove any residue or contaminants.
• Regularly inspect all components for signs of damage or wear.
• Replace any worn or damaged parts as needed using the spare parts provided.
• Store the tester in a clean and dry environment when not in use.

Diagrams
The diagrams section provides visual representations of the test cell assembly and other components, helping users understand the structure and arrangement of the tester.

Full Unit
This section provides a detailed description and illustration of the complete differential sticking tester unit, including all the necessary components and their functions.

Cell Assembly
The cell assembly section provides step-by-step instructions on how to assemble the test cell correctly, ensuring proper alignment and sealing.

Warranty and Return Policy
The warranty and return policy section provides information on the warranty coverage and terms, as well as the procedure for returning the product in case of any issues or defects.

FAQ

• Q: What pressure should be used for pressurizing the test cell?
  A: The specified pressure for pressurizing the test cell may vary depending on the specific requirements of the test. Refer to the test procedure or consult the user manual for the recommended pressure range.

• Q: How often should I clean the test cell?
  A: It is recommended to clean the test cell after each use to prevent any residue buildup that could affect the accuracy of the results. Regular cleaning will ensure reliable and consistent measurements.

• Q: Can I use any cleaning solution for cleaning the components?
  A: It is recommended to use a cleaning solution specifically designed for cleaning drilling fluid testing equipment. These solutions are formulated to effectively remove drilling fluid residues without causing damage to the components.

• Q: How do I know if a component needs to be replaced?
  A: Inspect all components regularly for signs of damage or wear. If you notice any cracks, deformations, or significant wear, it is advisable to replace the component to maintain the accuracy and reliability of the tester.

• Q: Can I use the differential sticking tester for other types of fluids?
  A: The differential sticking tester is designed specifically for testing drilling fluids. It may not provide accurate results for other types of fluids. It is recommended to consult the user manual or contact the manufacturer for guidance on testing different types of fluids.

Differential 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.ofite.com
©Copyright OFITE 2013

Intro

The OFITE Differential Sticking Tester measures the “Stuck Pipe Tendency Coefficient” of drilling fluids, and also determines how effective lubricants or treatments might be with any given drilling fluid. This coefficient takes into ac-count both the friction, or “stickiness”, of the filter cake, as well as the amount of cake building that must occur in order to freeze or stick the pipe in the hole. The coefficient is determined by running a Timed Filtration test. By measuring the area of cake building during a test, the “Bulk Sticking Coefficient” is obtained and read directly at the conclusion of the test. How likely a given fluid will be to produce a stuck pipe situation and how effective a given treatment may be, can be immediately determined on-site.

Description

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 fitted 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 flat-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 filter paper, stainless steel micro-corrugation disks are provided. For convenience a stainless steel carrying case is available as an optional item.

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         5⁄16″ Socket with ⅜” Drive

• 150-58         Torque Plate, Flat Bottom

• 150-59         Torque Plate, Spherical

• 153-16         Glass Graduated Cylinder, 25 mL × 2⁄10 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

  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 × 2⁄10 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”

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 exercised at all times. All safety precautions must be met, especially in the cell breakdown procedure after the filtration procedure has been completed.
• Never transport CO2 bulbs or cartridges by airplane without proper packaging. Cabin depressurization could cause them to explode.
• Before pressuring, always check to be sure the regulator is in a closed position 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 Differential Sticking Tester, never exceed 500 PSI (3,450 kPa). When depressurizing, shut off the pressure supply, then
• bleed off the system of pressure with the valve, and finally back out the regulator T-screw.

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 flat torque plate (#150-58) is completely flat across the surface. The
difference between the two is sometimes difficult to see. To distinguish between the two, place them next to each other on a flat surface. The spherical torque plate will rock slightly, while the flat torque plate will sit firmly.

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.

4. Tip: Place a sheet of filter paper on top of the screen on the inner cap. On top of the filter paper, place the rubber gasket, then the plastic ring.
   The locking mesh disk can be used to lock the filter cake to the paper so that it does not stick to the torque plate face and break lose from the filter paper. If you choose to use the locking mesh disk, place it on top of the filter paper, beneath the rubber gasket.

5.  Screw the retaining ring in place on top of the filter 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.

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 fluid 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.   Tip : 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.

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 filtration. Record the time of the start of the test.

23. Continue filtration for 10 minutes, or until the desired filtrate 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 sufficiently 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.

25. Record the filtrate volume.

26. Allow the torque plate to stick in the down position for 10 minutes.

27. Remove the lever and attach the socket to the torque wrench. Place the torque wrench and socket on the hex top of the torque plate stem. Wedge the lever between the columns above the cell platform so it can be used as a counter-torque lever.
    Important :If the filter paper tears when the torque plate is rotated, cell pressure will be lost through the valve stem. A standard HTHP Filter Press back pressure receiver may be substituted for the graduated cylinder while the torque readings are being taken. A length of rubber or tigon tubing can also be attached to the valve stem with the outlet end attached to a closed container.

28.  Measure the torque by rotating the torque plate in either direction with the torque wrench. Observe the dial reading.

29. Repeat the torque measurements three to six times, allowing 30 seconds between each check. Record each reading.

30. Calculate the average torque reading and record the plate sticking time.

Disassembly

1. Turn the regulator T-handle counter-clockwise until the pressure gauge reads 0. Once the T-handle turns freely, open the bleeder valve.

2. Unscrew the barrel on the CO2 assembly and remove the empty cartridge.

3. Remove the torque wrench and socket from the test cell.

4. Remove the CO2 pressure assembly from the top valve stem.

5. Slowly open the valve stem to relieve any remaining pressure inside the test cell.

6. Remove the cell cap. If the torque plate remains in the cell cap, carefully push it through the lid by the stem.

7. Empty the test cell.

8. Gently wash the sample from the edge of the torque plate.

9. Note the diameter of the depression from the torque plate. If this diameter is less than 2 inches or if any cake is adhering to the edge of the torque plate, estimate the edge height of the cake from the filter paper.
   If the cake is stuck to the torque plate rather than to the filter paper, then the test is invalid. Repeat the test using the locking mesh.

10. Using the retainer wrench, unscrew the retaining ring. Remove the slip ring and gasket. Remove the locking mesh, filter paper, and filter cake. Examine the filter cake as desired and note any observations.

11. Remove the cell from the stage and thoroughly clean all parts. Polish any surface where corrosion is noted.

12. Check all o-rings for damage or wear and replace as needed. Lubricate all o-rings with grease.

Theory

Bulk Sticking Coefficient Derivation
The Bulk Sticking Coefficient is the ratio of the force necessary to initiate sliding of the plate (Fs) to the normal force on the plate

Where

• = Average of readings from Torque Wrench (inch-pounds)
• = Radius of Plate (inches)
• = Height above flat surface of cake around the edge of the plate (inches)
• P =Cell Pressure (PSI), differential (inlet to outlet)
• =Sliding force
• =Normal force on plate
• =Bulk Sticking Coefficient
• =Stuck Tendency Coefficient

The Sliding Force
The Sliding Force (Fs) is a function of the measured torque (Tu). This equation should only be used when the radius is 1 and edge effects are not being considered. The normal force
The Normal Force **is determined by multiplying the area by the differential pressure. This assumes that a pressure of 477.5 PSI was used during the test.
If you are considering edge effects The Bulk Sticking Coefficient**

The Bulk Sticking Coefficient ****is calculated by dividing the Sliding Force by the Normal Force

Ignoring Edge Effects

For a standard pressure of 477.5 PSI (3,292 kPa)

And for r = 1″

Taking into account Edge Effects

For a Standard pressure of 477.5 PSI (3,292 kPa) and r = 1″

The Stuck Tendency Coefficient   is equal to the Bulk Sticking Coefficient ****multiplied by the variable stuck area.

Note : is not valid for the flat plate because the stuck area is either 0 or 3.14 (r = 1) and not a variable.

Theory

Example
The drilling fluid sample is mixed and then loaded into the cell and pressurized at 477.5 PSI (3292 kPa) for 10 minutes. The torque plate is seated using the lever and held for two minutes. Eight additional minutes are then allowed to pass. The breaking torque is then measured in four breaks at 30 seconds apart

The drilling fluid sample has an average 0.039 Stuck Tendency Coefficient. The pressure is then removed and the cell is carefully opened, leaving the torque plate set in the filter cake. The torque plate and cake are washed and the torque plate is turned (not lifted) loose. The diameter of the imprint of the torque plate impression (smoothed dome area) is measured at 1.57″ (3.95 cm) diameter, which gives a radius of 0.785″ (1.98 cm).
Therefore, (using inch dimensions)

Theory
Worksheet

1. Using the spherical torque plate and inch dimensions For a standard pressure of 477.5 PSI (3,292 kPa)
2.  Using the spherical torque plate and 477.5 PSI (3,292 kPa) and inch dimensions
   •  For cake with less than 1″ stuck radius
   •  Using either the spherical or flat torque plate and 477.5 PSI (3,292 kPa) and inch dimensions
     For cake with 1″ radius, edge effects considered and a pressure 477.5 PSI (3,292 kPa)

Maintenance

1. Disassemble the test cell after each test and thoroughly clean and dry all surfaces.
2. Check all orings and oring grooves for signs of wear or damage. Re-place any damaged o-ring and lubricate all o-rings before they are in-stalled.
3. Wash and dry the support screen and the locking mesh disk (If used).
4.  Wipe any spilled fluid or other debris from the stand. Some materials may damage the finish of these parts if allowed to remain for a long period of time.
5. Sample fluids can cause corrosion in the test cell and cap. The standard cell is made of 303 stainless steel, however other materials, which are more corrosive resistant, are available. Periodically inspect the inside of the cell for evidence of corrosion. Light corrosion may be removed using 329 or finer wet or dry sand paper. Deeper corrosion pitting may be removed by sand blasting the area of the corrosion. If severe corrosion is evident, the cell should be replaced.
6.  A metal-to-metal pressure tight seal is made between the valve stem and its seat. Leaks can occur if either the valve stem or the seat is damaged. The conical point of the valve stem should be inspected for damage by removing the stem from the cap or cell body and replacing the stem if the point is damaged. If the point is in good condition, the seat in the cell or cap may be rough. A 5⁄16″ drill bit can be used to re-surface the seat, or a special resurfacing tool may be ordered from OFI Testing Equipment. Valve stems should also be inspected for possible plugging of the pas-sages by dried fluid samples. A small drill or wire may be used to insure that both the cross-bore and the main passage openings are clear.

Diagrams

Full Unit

Diagrams

Cell Assembly

Warranty and Return Policy

Warranty
OFI Testing Equipment, Inc. (OFITE) warrants that the products shall be free from liens and defects in title, and shall conform in all respects to the terms of the sales order and the specifications applicable to the products. All products shall be furnished subject to OFITE’s standard manufacturing variations and practices. Unless the warranty period is otherwise extended in writing, the following warranty shall apply: if, at any time prior to twelve (12) months from the date of invoice, the products, or any part thereof, do not conform to these warranties or to the specifications applicable thereto, and OFITE is so notified in writing upon discovery, OFITE shall promptly repair or replace the defective products. Notwithstanding the foregoing, OFITE’s warranty obligations shall not extend to any use by the buyer of the products in conditions more severe than OFITE’s recommendations, nor to any defects which were visually observable by the buyer but which are not promptly brought to OFITE’s attention.

In the event that the buyer has purchased installation and commissioning services on applicable products, the above warranty shall extend for an additional period of twelve (12) months from the date of the original warranty expiration for such products.

In the event that OFITE is requested to provide customized research and development for the buyer, OFITE shall use its best efforts but makes no guarantees to the buyer that any products will be provided.
OFITE makes no other warranties or guarantees to the buyer, either express or implied, and the warranties provided in this clause shall be exclusive of any other warranties including ANY IMPLIED OR STATUTORY WARRANTIES OF FITNESS FOR PURPOSE, MERCHANTABILITY, AND OTHER STATUTORY REMEDIES WHICH ARE WAIVED.

This limited warranty does not cover any losses or damages that occur as a result of

•  Improper installation or maintenance of the products
•  Misuse
• Neglect
• Adjustment by non-authorized sources
• Improper environment
• Excessive or inadequate heating or air conditioning or electrical power failures, surges, or other irregularities
• Equipment, products, or material not manufactured by OFITE
• Firmware or hardware that have been modified or altered by a third party
• Consumable parts (bearings, accessories, etc.)

Returns and Repairs
Items being returned must be carefully packaged to prevent damage in shipment and insured against possible damage or loss. OFITE will not be responsible for equipment damaged due to insufficient packaging. Any non-defective items returned to OFITE within ninety (90) days of invoice are subject to a15% restocking fee. Items returned must be received by OFITE in original condition for it to be accepted. Reagents and special order items will not be accepted for return or refund.

OFITE employs experienced personnel to service and repair equipment manufactured by us, as well as other companies. To help expedite the repair process, please include a repair form with all equipment sent to OFITE for repair. Be sure to include your name, company name, phone number, email address, detailed description of work to be done, purchase order number, and a shipping address for returning the equipment. All repairs performed as “repair as needed” are subject to the ninety (90) day limited warranty. All “Certified Repairs” are subject to the twelve (12) month limited warranty.
Returns and potential warranty repairs require a Return Material Authorization (RMA) number. An RMA form is available from your sales or service representative.
Please ship all equipment (with the RMA number for returns or warranty repairs) to the following address

OFI Testing Equipment, Inc.

• Attn : Repair Department
• 11302 Steeplecrest Dr.
• Houston, TX 77065
• USA

OFITE also offers competitive service contracts for repairing and/or maintaining your lab equipment, including equipment from other manufacturers. For more information about our technical support and repair services, please contact techservice@ofite.com.

• OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA
• Tel : 832-320-7300
• Fax : 713-880-9886
• www.ofite.com

References

• OFI Testing Equipment, Inc. - Home

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