Centralizers, stop collars, float equipment and cementing plugs that position the casing, protect the cement job and cut drill-out time — in sizes from 3-1/2″ to 30″.
Centralizers position the casing uniformly in the wellbore for an even distribution of cement slurry. They reduce friction between casing and wellbore, keep the casing off the borehole wall and leave a continuous annular clearance so cement fully seals the casing to the formation.
All Marshall casing centralizers follow API RP 10-2 recommendations.
With a slightly larger diameter than the wellbore, bow spring centralizers are effective in vertical and slightly deviated wells, centralizing the casing to improve cementing efficiency.
Built from cast aluminium or steel. Their diameter is smaller than the wellbore, so they are less effective than bow spring types in vertical wells — but they are rugged and perform well in deviated wellbores.
For applications that demand a good primary cement job — deviated and horizontal wells, liner overlaps and shoe joints. The spiral vane was developed for better cementing and optimum flow area in highly deviated and horizontal wells.
Locks onto the casing without being slipped over the end, for quick and easy installation — with a holding force higher than the centralizer starting force.
A nut-and-bolt assembly draws the collar into a friction grip around the full perimeter of the casing.
Float shoes and collars guide the casing into the hole and safeguard the quality of the cement job.
The float shoe contains a back-pressure valve that stops wellbore fluids entering the casing as it is lowered, and prevents cement flowing back after placement — while still allowing circulation down through the casing.
The float collar has a back-pressure valve serving the same function and is run several joints above the shoe. It provides a seat for the cementing plugs, helping the top plug shut off flow and preventing over-displacement. The space between shoe and collar traps fluid contaminated by the plugs' wiping action, keeping it away from the shoe where a strong cement bond matters most.
The most economical and widely used type, delivering maximum circulation rate in vertical, horizontal and deviated wells. The plunger-type single valve prevents cement back-flow, provides casing buoyancy during run-in and acts as an internal BOP while running and cementing the casing. All parts are PDC drillable and CNC machined.
Top and bottom plugs remove mud during cementing and keep the slurry clean. Bottom plugs are red and top plugs black for easy identification on site.
Hollow body, run ahead of the cement slurry to minimise contamination by fluids inside the casing. A rubber diaphragm opens once the plug lands and latches in the float collar.
Solid body that gives a positive pressure indication on landing. It displaces the cement and latches into the bottom plug with an anti-rotation feature that eliminates spin during drill-out.
| Product | Sizes | Types / options | Standard |
|---|---|---|---|
| Bow spring centralizer | 4-1/2″ – 20″ | Single-piece, hinged, slip-on; welded or non-welded | API RP 10-2 · API 10D tested |
| Solid rigid centralizer | 4-1/2″ – 20″ | Aluminium or steel; straight / spiral vane; rollers optional | API RP 10-2 |
| Hinged bolted stop collar | To casing size | Cross-bolt, hinge-mounted | — |
| Float shoe & collar | 3-1/2″ – 30″ | Single valve; cement, aluminium or bladed nose | API threads: EUE, NUE, LTC, STC, BTC, VAM TOP |
| Cementing plugs | 4-1/2″ – 20″ | Top & bottom; NR, SBR, NBR, HNBR | PDC drillable |
Send us your casing sizes, connections and well profile — we'll quote a complete accessories package.