Liner Wiper Plug | 15,000 PSI | -55°C to 180°C | PDC Drillable | Positive Latch | Liner Cementing

The Liner Wiper Plug (LWPC) is a specialized downhole cementing tool designed for liner cementing operations, primarily used to separate cement slurry from displacement fluids, wipe the inner wall of the liner clean of residual drilling fluid, and ensure complete fluid displacement during the cementing process - directly improving cement bond quality and cement sheath integrity, which are critical for long-term zonal isolation and well integrity. Unlike traditional cement darts that provide only basic fluid separation with minimal wall wiping, our liner wiper plug features flexible cup-like elastomer extensions that actively wipe the liner wall as the plug travels, removing residual drilling fluid and filter cake that would otherwise compromise the cement-to-formation bond. Our product integrates an advanced sealing mechanism with robust, drillable construction, making it suitable for a wide range of well configurations from conventional vertical wells to complex horizontal and multilateral completions. The plug is connected to a shear pin adapter (or shear screw adapter) as the last item in the mechanical or hydraulic setting string, and is pumped down the liner following the cement slurry. Once it reaches the landing collar, the positive latch mechanism engages and locks the plug securely in place - providing reliable indication of proper placement, preventing upward movement and cement reentry during well production, and acting as a backup seal for the floating equipment. Constructed from high-grade aluminum, polymers, composite materials, and elastomers including nitrile and HSN, the liner wiper plug is rated to pressures up to 15,000 PSI with an ultra-wide temperature range of -55°C to +180°C - covering cold shallow water environments and hot deep reservoirs alike - and is compatible with liner sizes from 2-7/8" to 13-3/8", with custom sizes available. After cementing operations are complete, the drillable materials allow for rapid and easy removal with a PDC bit, enabling seamless continuation of well operations without damaging downhole equipment. Whether for shallow water wells, deep oil and gas reservoirs, or specialized geothermal projects, our Liner Wiper Plug delivers consistent and reliable performance, reducing cementing failure risk and enhancing overall well integrity.

1. Precision-Engineered Sealing with Flexible Cup Extensions

Equipped with flexible cup-like elastomer extensions and a precision sealing mechanism, the Liner Wiper Plug creates a positive, leak-proof barrier between drilling fluids and cement slurry - effectively preventing contamination and ensuring complete displacement of fluids during cementing operations. The unique profile of the wiper cup is optimized through extensive flow and sealing testing to achieve optimal wiping performance without requiring excessive pump pressure, reducing the risk of formation breakdown or losses during displacement. The cup design conforms to liner ID variations and minor ovality, maintaining contact and wiping effectiveness even in non-uniform wellbores.

2. Robust, Drillable Construction with Ultra-Wide Temperature Range

Manufactured using high-grade aluminum, polymers, composite materials, and elastomers (including nitriles and HSN), the Liner Wiper Plug is built to withstand high-pressure and high-temperature downhole environments - rated to 15,000 PSI with an operating temperature range from -55°C to +180°C (customizable for higher temperatures and pressures). The robust design ensures reliable performance even in the most challenging well conditions, while the fully drillable materials - aluminum and polymers - allow for rapid and easy drill-out with a PDC bit after cementing completion, producing small cuttings that circulate out easily without damaging downhole equipment or the cement sheath.

3. Positive Latch Mechanism for Confirmed Placement and Backup Sealing

Features a positive latch mechanism that provides reliable mechanical indication of proper placement when the plug reaches and engages the landing collar - reducing uncertainty during critical cementing operations. Once latched, the plug is locked securely in place to prevent upward movement during well production, preventing cement reentry into the liner and acting as a backup seal for floating equipment (float collar/float shoe) - providing an additional barrier in case of primary floating equipment failure. The latch engagement is confirmed by pump pressure increase or weight indication at surface.

4. Superior Wiping Performance vs. Traditional Dart Systems

The enhanced wiping action of the flexible cup extensions effectively removes residual drilling fluid and filter cake from the liner wall - a key advantage over traditional cement dart systems which provide only basic fluid separation with minimal wall contact. By removing residual mud and filter cake, the liner wiper plug improves cement-to-formation and cement-to-casing bond quality, reduces the risk of microannulus and cementing failures, and enhances long-term zonal isolation and well integrity. The positive seal also ensures complete displacement of cement slurry, minimizing cement waste and ensuring the designed cement top.

5. Versatile Design for Diverse Well Types

Available in multiple configurations to accommodate different liner sizes (2-7/8" to 13-3/8") and cementing scenarios, the Liner Wiper Plug is highly versatile for diverse well types - including vertical, horizontal, and multilateral wells; shallow water and offshore operations; deep oil and gas reservoirs with high temperature and pressure; and geothermal well projects. It can be customized to meet specific well conditions including elastomer selection for special fluids, custom liner sizes, and specialized latch configurations. The plug is compatible with both mechanical and hydraulic setting strings via the shear pin adapter connection.

The Liner Wiper Plug operates in four phases during liner cementing operations:

Phase 1: Make-Up and Deployment

The Liner Wiper Plug is attached to the shear pin adapter (or shear screw adapter) as the last item in the mechanical or hydraulic setting string, positioned below the liner hanger setting tool. The complete assembly is run into the wellbore to the target depth. The shear pin connection holds the plug in place during running, preventing premature activation.

Phase 2: Cementing and Pump-Down

During cementing operations, cement slurry is pumped through the work string and liner. After the cement slurry is in place, the Liner Wiper Plug is released - typically by applying pressure to shear the shear pins - and is pumped down the liner following the cement slurry, ahead of the displacement fluid. As the plug moves forward, its flexible cup-like elastomer extensions expand and conform to the inner wall of the liner, creating a tight seal between the cement slurry below and the displacement fluid above. The cup extensions actively wipe residual drilling fluid and filter cake from the liner wall as the plug travels, improving the surface for cement bonding.

Phase 3: Landing and Latching

Once the plug reaches the landing collar at the bottom of the liner, the positive latch mechanism engages - locking the plug securely in place. Latching is confirmed at surface by a pressure increase or weight indication. The locked plug prevents upward movement, prevents cement reentry into the liner from below, and acts as a backup seal for the floating equipment. The well is then allowed to wait on cement (WOC) for the cement to cure.

Phase 4: Drill-Out

After the cement has cured and cementing operations are complete, the Liner Wiper Plug - constructed from drillable aluminum and polymer materials - is drilled out using a PDC bit on drill pipe or coiled tubing. The drill-out is rapid and produces small, easily circulated cuttings that do not damage the cement sheath, liner, or downhole equipment. After drill-out, the well is ready for subsequent completion operations including perforation, stimulation, or production.

Our Liner Wiper Plug is manufactured under an ISO 9001:2015 certified quality management system, with strict quality control throughout the production process:

Raw Material Control

High-grade aluminum, polymers, and elastomer materials (nitrile, HSN) are sourced from approved suppliers and accompanied by material test reports (MTR) verifying composition, mechanical properties, hardness, and temperature/pressure ratings. Each batch of elastomer cup material is tested for tensile strength, compression set, and fluid compatibility before release to production.

In-Process Manufacturing Control

All components are machined and molded with documented process parameters. Critical dimensions - cup OD, sealing lip profile, latch mechanism dimensions, shear pin adapter connection, and landing collar engagement profile - are inspected at first-article, in-process, and final inspection stages using calibrated measuring instruments.

Performance Testing

• Pressure Seal Test: Each assembled plug is hydrostatically tested to verify sealing integrity at rated pressure

• Latch Engagement Test: Sample plugs from each production lot are tested for positive latch engagement and release force with standard landing collar profiles

• Shear Pin Test: Shear pin activation force verified within specification range

• Drill-Out Test: Representative samples drilled with PDC bits to verify drill-out time and cutting characteristics

• Dimensional Inspection: 100% verification of critical mating dimensions

Warranty and Support

We provide a 12-month warranty from the date of shipment against manufacturing defects in materials and workmanship, with 24-hour technical support for running procedures, cementing optimization, and troubleshooting.

We offer comprehensive customization to match specific liner cementing requirements:

• Custom liner sizes beyond the standard 2-7/8" to 13-3/8" range

• Custom pressure and temperature ratings (standard 15,000 PSI / -55°C to 180°C)

• Elastomer cup material selection (nitrile, HSN, Viton, Aflas) based on cement and fluid chemistry

• Custom latch configuration for non-standard landing collar profiles

• Shear pin/screw activation force customization

• Mechanical or hydraulic setting string connection compatibility

• OEM branding and custom packaging

• Non-rotating or rotating cup configurations

Lead time for custom orders: 15–30 working days depending on complexity; sample evaluation units available before bulk orders.

1. Conventional Vertical Oil and Gas Wells

Standard liner cementing in vertical wells, where the liner wiper plug provides reliable cement slurry displacement and wall wiping to ensure a quality cement sheath. The positive latch mechanism confirms placement at the landing collar, and the PDC-drillable construction allows fast drill-out after WOC.

2. Complex Horizontal and Multilateral Well Completions

Liner cementing in horizontal and multilateral wells where effective mud removal and cement placement are challenging. The flexible cup extensions maintain wall contact and wiping effectiveness in deviated sections, and the robust construction withstands extended pump-down times in long horizontal laterals. The positive seal ensures complete cement displacement in low-angle sections where gravity segregation can occur.

3. Shallow Water and Offshore Operations

Suitable for shallow water and offshore cementing operations where the -55°C low-temperature rating handles cold seawater conditions, and the reliable sealing and latch mechanism reduce the risk of costly cementing failures in high-cost offshore environments. The compact design is compatible with offshore rig cementing equipment.

4. Deep HPHT Reservoirs

Designed for deep oil and gas reservoirs with high temperature and high pressure - rated to 15,000 PSI and 180°C - where cementing integrity is critical for well control and zonal isolation. The high-grade materials maintain sealing and structural integrity under extreme downhole conditions, and the positive latch provides a reliable backup seal in case of floating equipment failure at high pressure.

5. Geothermal Well Projects

Suitable for geothermal well cementing operations, where high temperatures and corrosive fluids challenge conventional cementing tools. The wide temperature range and robust elastomer options accommodate geothermal conditions, and the improved cement bond quality enhances long-term well integrity in geothermal injectors and producers.

6. Wells Requiring Strict Cement Bond Quality and Zonal Isolation

Particularly valuable in wells requiring strict zonal isolation - including sour gas wells, underground gas storage, and injection wells - where a high-quality cement sheath is essential for long-term isolation. The superior wiping performance compared to traditional dart systems directly improves cement-to-formation bond, reducing the risk of microannulus and sustained casing pressure (SCP).

Q: What is the main function of a Liner Wiper Plug?

A: The main function is to separate cement slurry from displacement fluids during liner cementing operations, wipe residual drilling fluid and filter cake from the inner wall of the liner to improve cement bond quality, and provide a positive seal to prevent cement reentry and fluid contamination. Once latched at the landing collar, it also acts as a backup seal for the floating equipment.

Q: How is the Liner Wiper Plug different from a traditional cement dart?

A: A traditional cement dart provides only basic fluid separation with minimal wall contact - it separates fluids but does not effectively wipe the liner wall. The Liner Wiper Plug features flexible cup-like elastomer extensions that actively wipe the liner wall as it travels, removing residual mud and filter cake to significantly improve cement-to-formation bond quality. It also has a positive latch mechanism that confirms placement at the landing collar and provides a backup seal, which a standard dart does not provide.

Q: Is the Liner Wiper Plug drillable?

A: Yes. Our Liner Wiper Plug is made of PDC-drillable materials including high-grade aluminum and specialized polymers, allowing for rapid and easy drill-out after cementing completion. The drill-out produces small, easily circulated cuttings without damaging the cement sheath, liner, or downhole equipment.

Q: What liner sizes and downhole conditions can it accommodate?

A: Standard sizes cover liner diameters from 2-7/8" to 13-3/8", with custom sizes available on request. The plug is rated to 15,000 PSI with an operating temperature range from -55°C to +180°C - covering cold shallow water and hot deep reservoir conditions. Customized versions for even higher pressures and temperatures are available upon request.

Q: How is the plug deployed and how is placement confirmed?

A: The plug is attached to a shear pin adapter as the last component in the mechanical or hydraulic setting string. After cement slurry is pumped, the plug is released by pressure (shearing the pins) and pumped down the liner following the cement. Placement is confirmed when the plug reaches the landing collar and the positive latch mechanism engages - indicated by a pressure increase or weight change at surface.

Q: What is the delivery time, MOQ, and payment method?

A: The MOQ is 1 piece for standard models. Standard products ship within 7–15 working days after deposit; custom sizes or configurations require 15–30 working days. We ship from Shanghai or Ningbo port. Payment terms include T/T (30% deposit, 70% before shipment), L/C at sight, and Western Union. Sample evaluation units are available.

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