API High Strength Slip-on Single Piece Spring Centralizer
This integral one-piece bow spring centralizer is a high-end centralization product. The
centralizers are built to gauge to offer easier, RIH, maximize standoff, and maximize the cement job. The UROS range of centralizers are built mostly for passing through close tolerance situations and then opening back up into under reamed holed sections, or washed out sections, while still providing quality stand-off performance. Bow spring sections are based on a straight bladed principle, but are curved in both axial and tangential directions. This cross curvature conforms to the borehole wall, while the axial curvature changes proportionally as it encounters different loads. As the loads increase, the surface contact area also increases, reducing the load per square unit of area. This helps avoid compression and shear failure of the formation surface.
Features
One-piece integral unit combined with zero start and running force.
High standoff ratio (+85%) combined with high restoring force.
Straight blade to achieve maximum slide effect.
Designed to compress fully in tight spots.
Reduces both torque and drag.
Made to gauge.
Sizes range from 4 1/2"to 20".
Characteristics:
1) Designed for High Restoring Force and Low Starting & Running Force
2) End collars are designed with self-locking action, which are easy to assemble.
3) Undergo special coating process to prevent from rust
4) Can be shipped in half assembled condition for economy in shipping and storage costs.
5) Specification: 4"---20". Any special sizes or combination can available on request.
Bow spring centralizers, both welded and non-welded, are to help center casing in wellbore, allowing even distribution of the cement around the casing during cementing operations according to API 10D standard. The sizes cover 4-1/2"~20".
Spring Bows
The spring bows, the critical parts of the Centralizer, are made of high quality special steel strips. These are sheared to size and normalised to have the proper grain structure. Bows are forged in four different unique designs to have varied heights. These are then hardened and tempered to ensure optimum mechanical properties to meet or exceed the STARTING AND RESTORING FORCD criteria specified in A.P.I. Standard 10-D. Bows are then flattended several times on a special machine tailor made for the purpose to attain constant height and to get permanent setting.
Specifications
Casing Size |
Hole Size |
Max O.D. |
in. |
in. |
mm |
in. |
20 |
24/26 |
650/714 |
25.591/28.110 |
18-5/8 |
22/24 |
590/680 |
23.228/26.772 |
16 |
20/22 |
550/613 |
21.654/24.132 |
14 |
18 |
484 |
19.055 |
13-3/8 |
17-1/2 |
470 |
18.504 |
12-3/4 |
17- 1/2 |
466 |
18.346 |
10-3/4 |
12-1/4 |
370 |
14.567 |
9-5/8 |
12-1/4 |
375 |
14.764 |
7-5/8 |
9-7/8 |
273 |
10.748 |
7 |
8- 1/2 |
252 |
9.921 |
6-5/8 |
8- 1/2 |
245 |
9.646 |
5- 1/2 |
8- 1/2 |
256 |
10,079 |
5 |
6- 1/2 |
190 |
7.480 |
4-1/2 |
6 |
181 |
7.126
|
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