Positive/Rigid Centralizer

Spiral Fins
Asta spiral rigid centralizer is specially designed for highly deviated or horizontal wells. This product is ideal for use with Liner Hangers. The steel construction ensures extra strength and superior toughness. The boat shaped Spiral fins minimize Drag Forces while running pipe. The fins glide smoothly in the low side of horizontal bore holes. Wide symmetrical fins are smoothly beveled on the both ends to have lower coefficient of friction and to ease casing movement in either direction. Fins designs also resist high side load. Spirally oriented Fins welded to the one piece rolled formed End Collar, which assured ultimate strength and uniformity in every weld. Steel construction provides superior toughness over other materials. Vanes can be selected to meet any hole-diameter from a choice of seven boat profile depths. Slip-On Spiral Rigid are provided for direct installation on the pipe by slipping on and can be provided with compatible Stop Collars beveled from one side positioned by set screw. Shipped in assembled condition only, available in all sizes ranging from 3 1⁄2” to 13 3/8” for any hole combination.

Straight Fins
Asta Welded Straight Rigid Centralizer are designed for high deviated horizontal well where casing centralization is a main consideration. The Straight Fins Centralizer is made in various lengths to satisfy various needs. Encompasses special size rolled Alloy Steels bars, welded to the one piece rolled formed End Collar, which assured ultimate strength and uniformity in every weld. Steel construction provides superior toughness over other materials. This product assures positive standoff, maximum flow; maximum well bore stabilization, maximum holding strength and minimum drag. Centralizers are provided for direct installation on pipe by slipping on, with or without set screw for elimination of Stop Collar. This product is shipped in assembled condition only. Available in all sizes ranging from 3 1/2” to 13 3/8” for any hole combination.

Table 1: Centralizer Product Specification
Casing Size (in) Hole Size (in) Number of Bow Band ID (in) Average Bow OD (in) Max. Starting / Running Force (lbf) Min. Restoring Force at 67% stand off (lbf)
API Asta API Asta
3-1/2 6 4 3.700 5.750 396 0 67 90.00
4-1/2 6 4 4.700 5.750 464 0 67 83.33
4-1/2 8-1/2 4 4.700 8.125 464 0 67 90.63
7 8-1/2 6 7.200 8.125 1040 0 67 75.00
7 9-1/2 6 7.200 9.125 1040 0 67 85.00
9-5/8 12-1/4 6 9.840 11.875 1600 0 67 85.71
13-3/8 17-1/2 8 13.600 17.000 2440 0 67 87.88
Notes: Other size & requirement are available based on request.

Ordering Suggestions
To assure the correct size and type of equipment is obtained, please specify:
1. Casing O.D on which the equipment will be used.
2. Hole size or casing I.D in which the equipment will be placed.
3. Any restriction through which the equipment will be run.

Product Picture

Positive Centralizer Spiral Fins Positive Centralizer Straight Fins