Composite Plug
Composite Plug
The Snub Nose™ composite frac plug is a versatile, field-configurable isolation system developed for multi-stage stimulation in vertical and horizontal wellbores. The platform enables operators to run a primary ball-drop frac plug while retaining the ability to convert to Bridge Plug, Flo-Back, or Flo-Back with Bio-Ball functionality at the wellsite.
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Constructed from proprietary composite materials, the tool is engineered for predictable milling behaviour, efficient debris circulation, and reduced drill-out time. The design eliminates tungsten carbide buttons and aluminium components while maintaining reliable anchoring through a patented cast-iron slip system.
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Operational concept
In its base configuration, Snub Nose™ is deployed and set using common industry setting tools. Once set, the plug remains open to allow continued fluid movement and wireline operations. Isolation is initiated when the surface-dropped ball lands in the internal seat, enabling pressure to be applied from above.
This approach allows service continuity prior to isolation while maintaining positive shutoff when required.
Modular wellsite adaptability
Where operating conditions or program objectives change, Snub Nose™ can be rapidly adapted without replacing the core platform.
Bridge Plug configuration introduces a top-venting feature that supports pressure equalization across the tool during drill-out, improving control and reducing the likelihood of trapped pressure.
Flo-Back configuration incorporates a one-way check valve. When formation pressure below the plug exceeds pressure above, the valve allows commingling. This enables operators to stimulate or test zones independently and subsequently remove multiple plugs in a single milling trip.
Flo-Back with Bio-Ball adds temporary sand protection and cross-flow prevention. The aqueous-soluble ball isolates the upper zone until exposure to downhole temperature, pressure, and fluids dissolves the barrier, after which the check valve permits communication. The system is particularly suited to underbalanced removal strategies.
Mechanical design and drill-out performance
The Snub Nose™ geometry has been optimized to support rapid pump-down in horizontal sections while minimizing the hydraulic energy required for deployment. Once stimulation operations are complete, the composite mandrel and internal materials promote consistent milling, commonly achieving drill times in the range of minutes rather than hours, subject to BHA and operating practice.
A positive lock-up mechanism assists when multiple plugs are installed within a single wellbore, maintaining integrity during high-pressure operations.
Element options
Single Element configuration provides a compact, one-piece sealing system. The shorter overall length simplifies milling and assists with debris transport to surface.
Three-Piece Element configuration is available for environments involving elevated temperature and pressure, providing enhanced robustness while retaining the same operational philosophy and compatibility.
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Conveyance flexibility
Snub Nose™ can be conveyed via wireline, coiled tubing, production tubing, or drill pipe. Wireline deployment speeds of up to approximately 450 ft/min can be achieved depending on well conditions and surface equipment.
Application envelope
The product family covers a broad range of casing sizes and weights and is available in ratings up to 10,000 psi and temperatures reaching 300°F, depending on configuration and elastomer selection. Detailed dimensional data, ball sizes, and setting compatibility are provided within the technical specification tables.
Engineering support
PDG works with completion teams to confirm sizing, material selection, and configuration prior to mobilization. This ensures compatibility with expected pressure regimes, temperature exposure, and post-frac removal strategy.
