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Oil production equipment at drilling site

Home Products Cementing Tools Casing String AccessoriesCasing Centralizer

Casing Centralizer – Precise Centralization, High-Efficiency Cementing

Casing centralizers are designed to ensure proper casing centralization, improve cementing quality, and minimize wear risk. Our application engineers leverage an extensive product range – including welded, non-welded, and unibody bow spring centralizers – to ensure optimal cement placement in any well condition, from standard to extreme environments. All products comply with API standards and are suitable for vertical wells, horizontal wells, and extended reach wells, with excellent resistant to high temperatures and high pressures. With exceptional centralization performance and reliability, our solutions help drilling contractors enhance operational efficiency and reduce non-productive time.

Casing Centralizer and stop collar on a blue background

Type

Bow Spring Centralizers
Solid Rigid Centralizers
Unibody Bow Spring Centralizers
Accessory: Casing Stop Collar

Bow Spring Centralizer

This design is common in casing running operations offering a good balance between wellbore performance and cost. The spring steel bows are welded to rigid end collars that supply support to the bows. They are available in both slip on and hinged configurations to aid installation. Bow spring centralizers provide good borehole standoff, have favorable restoring forces, and come in a variety of shapes and lengths for most well requirements.

Rigid Centralizer

Solid, welded blade centralizers offer high strength in horizontal and extended reach wells where rotation is needed to get casing to bottom. Rigid bars are welded to the centralizer collars, giving the design strength and durability. Rigid centralizers come in a variety of configurations, including hinged and slip-on, with both straight blade and spiral designs. Rigid centralizers are also available in composite materials which can reduce drag, enabling conventional casing runs in long laterals. Set screws are used in some configurations to lock the centralizer in place on the casing joint, providing extra holding force.

Unibody Bow Spring Centralizers

For horizontal wells with long laterals, tortuous boreholes, and severe well geometries (including high doglegs), a one piece, non-welded centralizer is the ideal choice. Unibody bow springs act as a semi-rigid centralizer, designed to be slightly under gauge minimizing drag while offering both flexibility and high restoring force. As the centralizer navigates restrictions, it is designed to compress and deform to a near-flat condition. As the borehole restriction is traversed, the centralizer reverts to its original form and shape without permanent deformation or damage.

Unibody bow spring centralizer on a white background

Casing Stop Collar

Casing stop collar is also called limit ring, stop ring, brake ring and so on. Used to limit the sliding of the centralizer or cement umbrella on the inner casing. There are slip-on stop collar, hinged spiral nail stop collar, hinged bolted stop collar and hinged set screw stop collar and so on.

Advantages

01

Manufactured from high-strength steel, offering excellent resistance to high pressure, corrosion, and high temperatures.

02

A wide range of popular casing centralizers is available, including bow spring and rigid types.

03

All products undergo rigorous testing that exceeds API 10D standards.

04

We maintain a comprehensive inspection process spanning raw materials, semi-finished products and finished products..

Specifications

Types: Rigid, bow-spring, and unibody types
Applicable casing sizes: 4-1/2" – 20"
Height: Customizable
Outer diameter (O.D.): 6" – 22"
Number of blades: Typically 4 to 8, customizable
Material: High-strength alloy steel
Temperature resistance: ≥ 150 °C
Maximum starting force: 396 lbf – 3760 lbf
Inner diameter (I.D.): 12.5" – 28"
Minimum centralization: ≥ 67%

Applications

Casing centralizers ensure that there is sufficient cement sheath thickness around the casing string, reduce running-in resistance, prevent casing sticking, and contribute to enhanced cementing quality.
Rigid centralizers are primarily used in horizontal wells and extended reach wells, where high strength and rotation capability are required to run the casing to the bottom.
Bow spring centralizers are the most common type, and can meet the requirements of most wells, providing an optimal balance between well performance and cost.
For horizontal wells with extended lateral sections, complex wellbores, and demanding well profiles—including high dogleg severity—the one-piece non-welded casing centralizer is the optimal choice.

Casing centralizer used in cementing systems

Download

Please download our PDF files for more detailed product specifications and dimensions.

Casing String Accessories