Composite frac plugs and bridge plugs both provide zonal isolation in completions, however their designs and ideal applications differ.
Composite frac plugs
Composite frac plugs utilize a mix of lightweight materials including engineered plastics, carbon fiber, and glass-reinforced epoxy. The composites enable high-pressure seals up to 15,000 psi while improving drillability compared to cast iron or aluminum. Specific designs optimize the flow area for production. Retrievable via coiled tubing or wireline, composites also enhance longevity over frac balls in multi-stage fracking.
Bridge Plugs
Bridge plugs predominantly utilize traditional Drillable cast iron or aluminum alloys. Their permanent setting provides robust seals up to 10,000 psi for reliable zonal isolation. With no need for retrieval, cast bridge plugs offer the simplest, most economical plugging option. Mills or drill bits readily drill out cast plugs before production.
Comparison of Key Attributes
Pressure Rating: Composite plugs provide higher pressure capability with ratings of 10,000 or even 15,000 psi versus typical 7,500 psi for cast plugs.
Temperature Range: Composite plug elements limit max temperature to around 300-350°F, while cast alloys reliably seal to over 400°F.
Installation: Composite plugs require more complex setting mechanisms but enable re-access. Cast bridge plugs use basic wireline or tubing.
Retrievability: Only composite plugs allow coil tubing or wireline retrieval after fracturing while cast plugs are permanent.
Drill out: The composite materials require less drilling effort and generate smaller cuttings versus cast iron.
Cost: Cast iron bridge plugs maintain a substantial cost advantage over composite plugs.
Case Studies
In the Eagleford basin, composite plugs provided 20% higher flow rates after fracturing than cast plugs. The reduced cuttings also saved an average of $8,000 per well in cleanup costs.
In deep Haynesville gas wells, composite plugs sealed reliably at over 350°F and 10,000 psi -conditions exceeding cast plug limits. Their removable design also allowed the re-fracturing wells multiple times.
Understanding the trade-offs between temporary composite and permanent cast plugs allows proper selection for each well scenario to optimize completion performance.
Vigor will provide you with the best quality composite frac plug,Please contact us at info@vigorpetroleum.com.
