Bolt Cover Type Shaffer Annular BOP 9" Bore 5000psi Forging Blowout Preventer

The Shaffer Bolt-Cover Spherical BOP is a high-reliability annular pressure control equipment which is designed for oil and gas drilling operations. As a key well control equipment, it delivers stable sealing and pressure control during drilling, tripping, and well intervention processes, mitigating blowout risks effectively to protect person safety, equipment, and the environment.

• Well Pressure Containment: Acts as a frontline defense against unexpected wellbore pressure surges, forming a tight seal to prevent blowouts.
• Universal Sealing Compatibility: Seals reliably on various downhole tools and components, including kellys, drill pipes, tool joints, drill collars, casing, and wireline tools.
• Pressurized Tripping Operations: Enables safe tripping of drill strings in and out of the wellbore under pressure, withstanding the wear of dynamic operations.
• Harsh Environment Adaptability: Suitable for internal H₂S service as standard, with straightforward conversion for external H₂S service; Arctic models are available to meet low-temperature API 16A requirements.

• Compact & Space-Saving Design
  • Height is 15 to 20% lower than comparable annular BOPs, ideal for installations with limited vertical space.
  • Simplified structure reduces overall footprint without compromising performance.
• Efficient & Cost-Effective Operation
  • Operates at a low hydraulic pressure of 1,500 psi, reducing the required accumulator size and associated costs.
  • Minimal hydraulic connections (only two for opening and closing) simplify system integration.
• Durable & Low-Maintenance
  • Wear rings on moving parts eliminate metal-to-metal contact, extending component service life.
  • Wiper seals and wide clearances prevent debris accumulation and accelerate wear.
  • Rugged sealing element with steel reinforcement maintains reliable performance for 2–4 times longer than conventional elements, reducing replacement frequency.
• Easy Servicing & Field Adaptability
  • Upper housing lifts off easily for access to internal components; adapter ring shields hydraulic systems from mud and grit during maintenance.
  • No complex tools required for routine servicing, minimizing downtime.

• Basic Closure & Opening
  • Closing: Apply hydraulic pressure (max 1,500 psi) to actuate the piston, driving the sealing element in a smooth upward and inward motion to seal the wellbore.
  • Opening: Release closing pressure and apply opening hydraulic pressure to retract the piston, allowing the sealing element to return to its open position automatically.
• Stripping Operations (Step-by-Step)
  • Close the BOP with a maximum of 1,500 psi hydraulic pressure.
  • Prior to stripping, reduce closing pressure to allow a slight leak (for lubrication and temperature control).
  • Maintain slight leakage if conditions permit; gradually increase pressure as the element wears to control excess leakage.
  • If leakage is prohibited, set pressure just enough to maintain a tight seal.
  • Switch to an alternate preventer when required closing pressure approaches 1,500 psi to avoid overwearing the element.
• Safety & Operational Notes
  • Ensure the BOP is rated for the well’s working pressure and fluid conditions (e.g., H₂S service).
  • Regularly inspect the sealing element for wear; replace if leakage exceeds acceptable limits or after prolonged stripping.
  • Comply with API 16A (Forth Edition, 2017) and NACE MR0175 standards for operation and maintenance.
  • Use oil (not grease) on the piston and cylinder during reassembly to ensure smooth movement.

• Bore Sizes: 4 ½ inches to 30 inches (varies by model).
• Working Pressure Ratings: 1,000 psi, 2,000 psi, 3,000 psi, 5,000 psi, and 10,000 psi.
• Temperature Range: Standard models (nitrile element): 40°F to 180°F (4°C to 82°C); low-temperature Arctic models available.
• Sealing Element Options: Nitrile (blue) and natural rubber (red) for different service conditions.