Dongying Boru Mechanical Equipment Co.,Ltd
For horizontal wells with long laterals, tortuous boreholes, and severe well geometries (including high doglegs), our unibody bow spring centralizers are the ideal choice. The one-piece, non-welded construction eliminates weak points, allowing for confident casing string rotation and reciprocation in tight wellbore situations.
During casing rotation operations, these centralizers remain in place while the pipe rotates inside them. This agitation capability during cementing operations improves cement bond and long-term cement integrity.
Unibody bow springs act as semi-rigid centralizers, designed to be slightly under gauge to minimize drag while offering both flexibility and high restoring force. They compress and deform to navigate restrictions, then revert to their original form without permanent deformation.
- Eliminates weak points with unibody construction
- Maintains position during casing rotation
- Improves cement bond and integrity
- Flexible yet maintains high restoring force
- Compresses through restrictions without permanent deformation
- Preventing Eccentricity: Maintains casing in wellbore center for uniform wear distribution
- Minimizing Contact: Creates consistent gap between casing and wellbore wall
- Enhancing Cement Coverage: Ensures uniform cement protection around casing
- Supporting Weight Distribution: Prevents localized stress concentrations
- Facilitating Fluid Movement: Helps flush away debris and cuttings
- Improving Wellbore Stability: Prevents casing buckling and sticking
| Model (in) | Hooping In-Dia. (mm) | Hooping Thickness (mm) | Hooping Height (mm) | Total Length (mm) | Max. Out-Dia. (mm) | Spring Pieces |
|---|---|---|---|---|---|---|
| 5-1/2*8-1/2 | 142-148 | 5-7 | 50-60 | 650±50 | 225±5 | 5 |
| 6*8-1/2 | 154-158 | 5-7 | 50-60 | 650±50 | 255±5 | 5 |
| 13-3/8*17-1/2 | 342-349 | 8 | 50-60 | 580 | 450±5 | 6 |
| 20*26 | 510-518 | 8 | 50-60 | 650±50 | 670±5 | 10 |
Rigid Roller centralizer used in deep water Horizon Well packing: wooden case
