Liner Wiper Plug (LWP)
Product Overview
The Liner Wiper Plug is a rubber wiping device used in liner hanger applications to separate cement from drilling fluid during liner cementation. Installed at the end of the liner hanger running tool, it receives the drill pipe wiper plug and ensures clean cement displacement while wiping the liner ID to prevent cement buildup or sheathing.
Key Features
- Ported design enables controlled fluid venting in the annular space
- Dual latching profiles for secure engagement with both drill pipe wiper plug and landing collar
- Rated for 5,000 psi differential pressure from above and below
- Integrated anti-rotation feature ensures reliable drill-out performance
- PDC drillable aluminum construction with HNBR wiping fins for durability
Applications & Completion Scenarios
- Used in liner hanger systems during primary cementing operations
- Ensures reliable fluid separation and liner ID cleaning
- Suitable for high-pressure, high-temperature wells requiring precise plug engagement
Advantages
- Dual-latch design provides secure and accurate plug positioning
- Ported construction prevents fluid entrapment and enhances cement placement efficiency
- Fully drillable aluminum body minimizes debris and drill-out time
Compatibility
Fully compatible with standard liner hanger assemblies, drill pipe wiper plugs, and landing collars across 4.5″–7″ liner sizes.
Certifications & Quality Assurance
Manufactured from premium materials and tested to meet or exceed API performance standards for liner cementing components.
Technical Specifications
Operational Parameters
| Parameter | Specification |
|---|---|
| Pressure Rating | 5,000 psi (from above and below) |
| Drill-Out | PDC drillable aluminum |
| Shear Pin Rating | 36–72 tpsi ±5% (depending on size) |
| Number of Shear Pins | 6–8 |
| Elastomer Material | HNBR |
Mechanical Specifications
| Liner Size | Casing Weight | Wiper Fin OD | Liner Wiper Seal Bore ID | Liner Wiper Nose OD | Number of Shear Pins | Shear Value (tpsi ±5%) |
|---|---|---|---|---|---|---|
| 4.5" | 11.6–15.1# | 4.10" | 1.871" | 2.501" | 6 | 72 |
| 4.5" (Combo)* | 11.6–15.1# | 3.50" & 4.18" | 1.871" | 2.501" | 6 | 72 |
| 5" | 18–23.2# | 4.75" | 1.871" | 2.501" | 6 | 72 |
| 7" | 26–32# | 6.79" | 2.207" | 3.031" | 8 | 36 |
Survivability / Limits
| Property | Value |
|---|---|
| Maximum Temperature | 150°C (HNBR fins) |
| Pressure Rating | 5,000 psi |
| Restriction Capability | Combination Liner Wiper passes 3.25" restriction |