Open Hole
CP8 — Co-Pivot Centraliser for 8.5in
Patented Co-Pivot mechanism with ultra-low-drag bearings — precise centralization of heavy strings in 8.5” wellbores.
Description
The Co-Pivot Centraliser (CP8) is the latest addition to the Focus™ range of precision centralisers for open hole. By synergizing Petromac’s patented “Co-Pivot” mechanism with our ultra-low-drag custom bearings, the CP8 delivers unparalleled performance.
The CP8 centraliser boasts robust strength and ensures precise centralization of heavy tool-strings in challenging conditions. Unlike conventional centralizers, our device reduces stick-slip and facilitates smooth gravity descent in high deviation wells.
Applications
- Centering Sonics and imaging tools in 8.5” wellbores
- Stick-slip elimination
- Conveyance of heavy toolstrings.
Specifications
| Model | CP8 | |
|---|---|---|
| Weight | 39 lbs | |
| Length | 19” | |
| Volume | 0.03ft3 | |
| Maximum OD1 | 8.25” | |
| Minimum Hole Size | Open Hole | Cased Hole |
| 8" | 7-½" | |
| Collapsed OD2 | 7-½" | |
| Max Load Carry Capability3 | 350 lbs | |
| Drag Coefficient, dynamic | 5% | |
| Drag Coefficient, Static | 12% | |
| Temperature rating | 400°F | |
| Pressure rating | 30,000 psi | |
| Taxi Bore4 | 3-⅝” | |
- 1Max OD can be increased to 8.8", this must be done at surface by changing position of the "OD selector stop".
- 2Collapse OD is dependent of tool diameter, collapse OD is 7.25" for a 3-3⁄8" Tool OD.
- 3Load carrying capacity is deviation and temperature dependent, see chart below..
- 4Reducing adapter sleeves are available to fit 3-3/8” tools.
| Body | 17-4 PH SS, Heat treated H1150 |
|---|---|
| Bearings | Custom Bush Bearing |
| Grease | Lubriplate 930AA |
| Attachment | Alloy Steel grub Screw , 1/4” hex, UNC Thread, Dog end type |
| SWL, Shear set screws | 17,000 lbs (4 screws) |
Charts & Diagrams
Other models in this family
All Focus™ Centralisers →| Model | Hole size | Bore | Temp | Weight |
|---|---|---|---|---|
| CP12 CP12 — Centering Parallelogram for 12in | 10-1/8″ – 17-1/2″ | 4-1/2″ | 400°F | 45 lbs |
| CA7 CA7 — Centering Adjustable Taxi for 7in | 7″ | 3-5/8″ | 400°F | 15 lbs |
| CRIL CRIL — Centraliser Rocker In-Line | 4-1/2″ – 7″ | — | 350°F | 65 lbs |
| CRU CRU — Centraliser Rocker for USIT | 4-1/2″ – 7″ | — | 400°F | 23 lbs |
| CX9 CX9 — Helix Centraliser | 7″ – 9-5/8″ | 3-5/8″ | 400°F | 40 lbs |