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Casing centralizer is a cementing tool which applied to centralize casing to improve the cementing quality.
Bow-spring casing centralizer is mainly used in vertical or slightly deviated wells. Bow-spring centralizer consists of couplings, bow spring strips and pins .Designed for High Restoring Force and Low Starting Force for centralizing the casing pipe in Horizontal and Deviated well.
Premium quality Bows are made of special alloy steel and hot formed in totally controlled heat treatment plant to achieve the uniform hardness all over.
Spec and performance index of bow spring casing centralizer meet Spec 10D.
The casing centralizer is connected by pin when operation, the unfolded centralizer can be stacked flatly for convenient storage and transportation.
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Centralizer Spec. (in) |
20 |
18-5/8 |
16 |
14 |
13-3/8 |
12-3/4 |
10-3/4 |
9-5/8 |
7-5/8 |
7 |
6-5/8 |
5-1/2 |
5 |
4-1/2 |
|
Casing Size (in) |
20 |
18-5/8 |
16 |
14 |
13-3/8 |
12-3/4 |
10-3/4 |
9-5/8 |
7-5/8 |
7 |
6-5/8 |
5-1/2 |
5 |
4-1/2 |
|
Open Hole Size (in) |
24 26 |
22 24 |
20 22 |
18 |
17-1/2 |
17-1/2 |
12-1/4 |
12-1/4 |
9-7/8 |
8-1/2 |
8 |
1/2 |
6-1/2 |
6 |
|
Max. O.D. (mm) |
650 714 |
590 680 |
550 613 |
484 |
470 |
466 |
370 |
375 |
273 |
252 |
245 |
256 |
190 |
181 |
Bow Spring Centalize:
The Non-Welded Bow Spring Centralizers are made under the sate af art Enineering Techniques and rugged quality system. They are developed to exceed 10D specification to be used under most demanding condition. These Centralizers are designed for High Restoring Forse and Low Starting Force for centralizing the casing pipe in a Vertical, Horizontal and Deviated well.
Description of Single Piece Bow Spring Casing Centralizer
The Single Piece Bow Spring Casing Centralizer is newly designed integrated steel flexible Centralizer used to centralize casing during the cementing stage of oil wells. Fully integrated (SLIP-ON) centralizers are manufactured in any diameter and as per customer requirements.
The blades, top and bottoms rings are made of one piece to ensure the centralizer s integrity during rig operations.
The specifications comply with Spec 10D for starting compression, running down hole and expansion force.
These centralizers offer high fatigue strength for axial forces and radial side loads on bows during tubular rotation.
More flexibility as comparison to other spring bow centralizer.
2. Features of Single Piece Bow Spring Casing Centralizer
1. Starting and restoring force confirm to Standard.
2. More flexibility as comparison to other spring bow centralizer
3. Greater centering efficiency
4. Higher Stand Off.
5. 360° wall coverage for increased load bearing area.
Available Size: 4-1/2" to 13-3/8".
1.All products are protected with thread protector
2.Wooden case, or customized packing.
3.Delivery: By truck, train, air, sea,express
1. What is a Bow Spring Centralizer?
A Bow Spring Centralizer is a downhole tool used in oil and gas well cementing operations. It features flexible steel bows that spring outward to center the casing string within the borehole, ensuring uniform cement distribution around the casing for effective zonal isolation and well integrity.
2.What are your payment terms?
Standard: 30% T/T deposit, 70% against copy of shipping documents
LC: Irrevocable Letter of Credit at sight
Project Terms: Negotiable for long-term contracts or large tenders
Trade Assurance: Supported through Made-in-China.com platform
3. What materials are used in construction?
We use high-quality materials suitable for harsh downhole conditions:
Bows: High-strength spring steel (AISI 4140/4150), carbon steel, or corrosion-resistant alloys
Collars/Cages: Carbon steel (AISI 1018/1020) or specified grades
Coating/Finish: Standard galvanized, epoxy coating, or customized for specific well conditions (HS, CO, high salinity)
Alternative Materials: Available for sour service, high-temperature, or corrosive environments
4. How do I select the right centralizer size?
Selection depends on:
Casing OD (Outside Diameter)
Hole Size (Open hole or cased hole diameter)
Required Standoff
Well Conditions (Dogleg severity, hole irregularities)
Please provide casing program details for our technical team to recommend the optimal model.
5. What is the "Starting Force" and "Running Force"?
Starting Force: The force required to initiate centralizer movement into the wellbore. We provide charts for each model.
Running Force: The force required to move the centralizer through the wellbore during casing run. It must be balanced to ensure proper centralization without excessive drag.
6. What types of bow designs do you offer?
Solid Bow: Standard design for most applications
Split Bow: For easier installation and reduced starting force
Hinged Bow: For highly deviated or horizontal wells
Non-Weld Bow: Eliminates weld points for maximum fatigue resistance
Custom Bows: Designed for specific wellbore geometries
7. Can you provide stop collars?
Yes, we supply matching Stop Collars (Casing Centralizer Clamps):
Materials: Same as centralizer collars
Locking Mechanisms: Set-screw, double-set-screw, or weld-on types
Sizes: To match your casing OD and centralizer design
8. What is your quality control process?
Every centralizer undergoes rigorous QC:
Material Certification: Mill test reports for all raw materials
Dimensional Inspection: Verified against tolerances
Force Testing: Starting and running forces measured with calibrated equipment
Hardness Testing: For spring bows and collars
Coating Inspection: Dry film thickness and adhesion tests
Final Audit: 100% visual and dimensional check before shipment
9. What is your production capacity and lead time?
Standard
Models: 15-25 days for orders up to 1000 pieces
Custom Designs: 30-45 days including design approval and prototype testing
Large Projects: Dedicated production line for volume orders (10,000+ pieces)
Rush Orders: Expedited production available
10. What is the MOQ (Minimum Order Quantity)?
Standard Sizes: MOQ 50 pieces per size
Custom Designs: MOQ 200 pieces (due to tooling setup)
Samples: 1-2 pieces available for testing and qualification
Project-Based: Flexible MOQ for tender projects or frame agreements
11. Do you offer OEM and custom engineering services?
Absolutely. We specialize in:
Custom Designs: For unique wellbore challenges
Reverse Engineering: From samples or drawings
Prototype Development: With testing validation
Technical Collaboration: With customer engineering teams
Private Labeling: Full OEM packaging and documentation
12. How are centralizers packaged for shipment?
We provide robust, field-ready packaging:
Individual Protection: Each centralizer wrapped in anti-corrosion material
Bundling: Stacked and strapped on wooden skids for easy handling
Export Crating: Heavy-duty wooden crates for sea freight
Marking: Clear labeling with size, type, and heat numbers
Documentation Pouch: Waterproof pouch containing all certificates
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