Cementing / Displacement Wiper Ball — Maximum Casing Drift ID 2.992″ (76.0 mm)
1. Product Description
The Merit Foam Ball for Cementing is a compressible, closed-cell polyurethane foam sphere engineered to wipe drilling fluid and cement slurry from the internal wall of casing or tubing during primary and remedial cementing operations. Its oversized, self-conforming outer diameter deforms elastically to seal against the pipe ID as it travels downhole under pump pressure, minimizing fluid bypass, reducing contamination between spacer/cement stages, and improving mud displacement efficiency. The product is designed as a drillable, single-trip, non-retrievable wiper element and is manufactured under process controls intended to give consistent compression and wipe performance across the specified casing drift range.
2. Application
- Primary cementing — wiping between lead/tail cement slurry and displacement fluid
- Remedial (squeeze) cementing — stage separation and fluid isolation
- Casing and liner cementing operations in vertical, deviated, and horizontal wellbores
- Compatible for use ahead of or behind cement plugs where a low-cost drillable wiper is required
- Recommended for casing/tubing strings with a minimum drift ID of 2.992″ (76.0 mm) and above, per the sizing table in Section 4
3. Technical Specifications
| Parameter | Specification | Notes |
| Product Type | Foam Wiper Ball (Cementing Ball) | Solid, closed-cell foam core |
| Core Material | Closed-cell polyurethane (PU) foam | High resilience, low fluid absorption |
| Outer Coating / Skin | Integral rigid PU skin (self-skinning foam) | Abrasion- and fluid-resistant |
| Nominal Foam Density | 160 – 240 kg/m³ (10 – 15 lb/ft³) | Standard duty; heavy-duty option available |
| Compression Ratio (Oversize) | 20% – 25% over nominal casing drift ID | Ensures full-contact wiping action |
| Compressibility | Elastic recovery > 90% after single-pass compression | Single-trip, non-retrievable design |
| Max. Recommended Differential Pressure | Up to 3,500 psi (24.1 MPa) | Application- and pipe-schedule dependent |
| Max. Operating Temperature (BHST) | Up to 250°F (121°C) standard / 350°F (177°C) HT option | HT grade available on request |
| Fluid Compatibility | Water-based mud (WBM), oil-based mud (OBM), brine, cement slurry, spacer fluids | Not recommended for prolonged exposure to aromatic solvents |
| Drillability | Fully drillable with standard PDC/roller-cone bit | No metal components — 100% drillable |
| Buoyancy | Positive (floats in water-based fluids) | Assists pump-down conveyance |
| Color Coding | Standard: Yellow / High-Temp: Red | Custom coding available |
4. Dimensional Data — Reference Sizing (Max. ID 2.992″)
The table below lists the governing casing/tubing drift dimension and the corresponding foam ball outer diameter supplied by Merit for this application. Foam ball OD is manufactured oversized relative to pipe drift ID to achieve full-wall wiping contact after compression.
| Casing Size / Weight | Casing Drift ID | Foam Ball Nominal OD |
| 3-1/2″ 9.20–9.30 lb/ft (typ.) | 2.992 in / 76.0 mm | 90 – 95 mm (3.54 – 3.74 in) |
| Governing Maximum Drift | 2.992 in (76.0 mm) | ≈ 92 mm (3.62 in) nominal, ±2 mm |
Note: Casing size shown is indicative of the API drift ID matching 2.992″. Actual OD is confirmed against the customer’s specified pipe grade, weight, and coupling type prior to manufacture.
5. Performance & Quality
- Manufactured under controlled foam-molding process for dimensional and density consistency
- Each production batch sample-tested for density, compression set, and dimensional tolerance
- Visual and dimensional inspection performed prior to packaging
- Traceable by batch/lot number printed on product packaging
6. Packaging, Storage & Handling
- Individually or bulk-packed in cartons, protected from UV exposure and moisture
- Recommended storage: cool, dry, indoor conditions, away from direct sunlight and solvents
- Shelf life: 24 months from date of manufacture under recommended storage conditions
- Handle with clean gloves to avoid contamination prior to deployment
7. Ordering Information
| Item | Description |
| Product Name | Foam Ball for Cementing |
| Sizing Basis | Maximum casing/tubing drift ID: 2.992″ (76.0 mm) |
| Standard Duty Option | Density 160–200 kg/m³, up to 250°F (121°C) |
| High-Temperature Option | Density 200–240 kg/m³, up to 350°F (177°C) |
| Minimum Order Quantity | 25 pcs |
| Packaging | Carton box, bulk or individually wrapped |
8. Disclaimer
Technical data provided herein represents typical manufacturing and performance parameters and is offered as a guideline for product selection. Final product specification, sizing, and pressure/temperature rating should be confirmed with Merit against the actual wellbore conditions, casing/tubing grade, and job design prior to use. Specifications are subject to change without prior notice as part of continuous product improvement.
9. Manufacturer / Supplier Contact
Merit
