FZ54-35U Ram BOP

1. Product Overview & Core Application

The FZ54-35U series Ram Blowout Preventers (BOPs) include two models: the single-ram FZ5435U and double-ram 2FZ5435U. Specifically engineered for high-pressure oil and gas drilling well control, these BOPs feature a 540.1mm (21 1/4 inch) drift diameter and a rated working pressure of 35MPa, complying with industry standards such as GB/T, ANSI/ASME, and API Spec 16A. Tailored for onshore/offshore drilling contractors, well workover teams, and oilfield operation companies, they serve as critical equipment to seal wellbores, shear drill pipes, and prevent blowouts, ensuring operational safety in medium-deep well drilling scenarios.

1.1 Product Introduction

The FZ54-35U series integrates advanced ram control technology, supporting three types of ram assemblies: pipe rams (for 5″, 5 1/2″, 13 3/8″ drill pipes), shear rams (for emergency pipe cutting), and variable diameter rams (2 7/8″-5 7/8″ adjustable range). With a hydrostatic test pressure of 52.5MPa (7500Psi) and hydraulic control system rated at 21MPa (3000Psi), the series delivers reliable performance under extreme pressure conditions. The single-ram model weighs 13,500kg, while the double-ram version weighs 256,700kg, adapting to different installation space and load-bearing requirements of drilling rigs.

1.2 Functional Description

These BOPs primarily realize three core functions: wellbore sealing, emergency pipe shearing, and variable-diameter adaptation. Pipe rams seal annular gaps between drill pipes and wellbores to isolate formation fluids; shear rams cut drill pipes quickly in blowout emergencies to shut in wells; variable-diameter rams accommodate multiple drill pipe sizes, reducing ram replacement frequency. The hydraulic control system operates at a recommended pressure of 8.4-10.5MPa (1200-1500Psi), ensuring smooth actuation of rams with precise control and fast response.

1.3 Structural Features

The FZ54-35U series adopts a modular structural design for easy maintenance. Key structural advantages include: forged steel housing for high pressure resistance and deformation prevention; double-sealing system (main piston seals + secondary sealing device) to eliminate leakage risks; guide rod positioning to ensure stable ram movement; and flange connection for secure assembly. The secondary sealing device is equipped with one-way valves and EM-09-1/L25mm grease, enabling on-site maintenance without disassembling the BOP. All sealing parts use high-performance materials such as lip-type packing and O-rings, enhancing corrosion resistance and service life.

1.4 Applicable Working Conditions

These BOPs are suitable for onshore and offshore vertical, directional, and horizontal drilling operations. With a T-20 temperature grade, they can operate stably in environments ranging from -20℃ to 60℃. They are compatible with formation fluids containing oil, gas, and mild corrosive media, and meet the sealing requirements of high-pressure wells with rated working pressure up to 35MPa. Typical application scenarios include medium-deep oil/gas wells, shale gas wells, and well workover operations requiring high well control reliability.

1.5 Maintenance & Care Recommendations

To extend service life and ensure operational safety, follow these maintenance guidelines: Conduct hydrostatic tests annually in accordance with API Spec 16A to verify pressure resistance; inspect sealing parts (O-rings, lip-type packing) every 3 months, replacing worn or deformed parts with genuine components to avoid compatibility issues; lubricate the secondary sealing device with EM-09-1/L25mm grease monthly to prevent seal hardening; clean hydraulic fluid filters every 2 months to avoid contamination-induced cylinder jamming; store spare parts in a dry, corrosion-free environment with thread protectors and seal covers; retorque flange bolts and screws regularly to prevent loosening due to vibration during operation.

FZ54-35U Ram BOP

List of sealing parts for tail rod of main piston

Parts list of seal (side door sealing ring) assembly of middle flange

parts of 2FZ5435U BOP

2. On-Site Fault Repair Cases

Case 1: Ram Sealing Leakage in 2FZ5435U BOP

Scenario: Leakage occurred at the pipe ram assembly during well shut-in operation. Root Cause: The front rubber core (P/N: 2C22.01A.01) was worn due to long-term friction with drill pipes, and the back-up ring (2C22A01.32) was deformed, failing to provide effective seal support. Repair: Replaced the worn rubber core and deformed back-up ring with genuine parts, cleaned the ram body, and applied compatible lubricant. Conducted a pressure test at 52.5MPa to confirm no leakage. Prevention: Inspect rubber cores for wear every 50 well shut-in cycles; replace back-up rings synchronously with O-rings.

Case 2: Shear Ram Blade Seal Failure in FZ5435U BOP

Scenario: The shear ram failed to seal after cutting the drill pipe, leading to formation fluid leakage. Root Cause: The shear ram blade seal (SBR5435CA.06.00) was damaged by metal debris generated during pipe cutting, and the left/right seals (SBR5435CA.03.00/04.00) were compressed unevenly.Repair: Replaced the blade seal and side seals, removed debris from the shear ram body, and adjusted the ram alignment to ensure uniform compression. Prevention: Clean the shear ram cavity after each cutting operation; inspect seal integrity before emergency use.

Case 3: Hydraulic Cylinder Actuation Failure in 2FZ5435U BOP

Scenario: The ram failed to open/close smoothly, and the hydraulic system pressure fluctuated abnormally. Root Cause: The lip-type packing of the main piston (C003-22 Φ430×470×23/25) was hardened due to hydraulic fluid contamination, increasing friction; the filter was clogged, restricting fluid flow. Repair: Replaced the lip-type packing and hydraulic fluid, cleaned the filter, and checked the one-way valve (2C01.17) for blockage. Prevention: Use ISO VG 46 hydraulic fluid compatible with sealing materials; replace filters every 6 months.

Case 4: Secondary Sealing Device Blockage in FZ5435U BOP

Scenario: The secondary sealing grease could not be injected, and local leakage was observed. Root Cause: The one-way valve (2C01.07) was clogged with aged grease, and the cock (2C01.20) thread was worn, affecting grease injection. Repair: Disassembled and cleaned the one-way valve, replaced the worn cock, and injected new EM-09-1/L25mm grease. Prevention: Inject secondary sealing grease quarterly; clean the one-way valve and cock annually to prevent grease aging and clogging.

3. FAQ

4. Procurement Guidance & Call to Action

The FZ54-35U series Ram BOPs are critical well control equipment for high-pressure oil and gas drilling, adhering to strict industry standards and reliable performance. When procuring, prioritize genuine parts that match the original equipment specifications—including ram assemblies, sealing parts, and hydraulic components—to ensure compatibility and compliance with pressure rating requirements. Genuine parts not only eliminate leakage and actuation failure risks but also extend the BOP’s service life, reducing long-term operation and maintenance costs.

We provide comprehensive technical support for the FZ54-35U series, including part compatibility verification, on-site maintenance guidance, and fault diagnosis services. Our team of oilfield experts can tailor maintenance plans based on your specific working conditions (e.g., corrosive media, temperature range) to optimize BOP performance. All products and parts meet international certification standards, ensuring compliance with onshore and offshore drilling regulations.

Choose our FZ54-35U series BOPs and genuine parts to safeguard your drilling operations. Whether you need single/double-ram models, spare parts, or technical consulting, we are committed to delivering high-quality solutions that align with your well control safety goals. Contact us today to discuss your specific requirements, and let our professional team support your oilfield operations with reliable equipment and services.

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