2FZ35-105UMK & FZ35-105UMK Ram Blowout Preventer (BOP) Parts Guide

Introduction

The 2FZ35-105UMK and FZ35-105UMK Ram Blowout Preventers (BOPs) are critical high-pressure well control devices widely utilized in oil and gas drilling operations, specifically engineered to mitigate wellbore pressure risks and prevent blowout incidents. As core components of well control systems, these BOP models are designed to seal the wellbore, shear drill pipes, and maintain well integrity under extreme downhole conditions. This guide focuses on the parts configuration of these two Ram BOP models, providing targeted technical support for drilling contractors, well maintenance teams, and procurement personnel. It serves as both a technical reference for troubleshooting and a standardized basis for parts procurement, ensuring operational continuity and safety compliance.

Product Overview

The 2FZ35-105UMK (dual ram) and FZ35-105UMK (single ram) Ram BOPs are categorized as high-pressure anti-sulfur well control equipment, compliant with industry standards for sour service environments. These devices integrate multiple ram assembly types—including pipe rams, double pipe rams, shear rams, and variable diameter rams—to adapt to diverse wellbore operations. The modular design of the BOPs enables efficient parts replacement and on-site maintenance, while the high-strength materials and precision machining of components (such as ram bodies, rubber cores, and sealing elements) ensure durability and reliability under operating pressures up to 105 MPa (15,000 psi) and harsh downhole conditions involving hydrogen sulfide (H₂S) corrosion.

Functional Description

The primary functions of the 2FZ35-105UMK and FZ35-105UMK Ram BOPs revolve around wellbore pressure control and emergency response, achieved through the coordinated operation of different ram assemblies:

Pipe Ram Function: Seals the annular space between the drill pipe and wellbore wall using front and top rubber cores, available in multiple sizes (2 3/8” to 10 3/4”) to match standard drill pipe diameters, as well as full-sealing variants for open wellbore conditions.

Double Pipe Ram Function: Designed for dual-pipe operations, providing simultaneous sealing for two concentric pipes (2 7/8” and 3 1/2” variants) to support complex drilling scenarios.

Shear Ram Function: Emergently shears drill pipes and seals the wellbore in blowout emergencies, utilizing high-hardness tool bits and precision-aligned shear surfaces to ensure reliable cutting and sealing performance.

Variable Diameter Ram Function: Adapts to multiple pipe diameter ranges (3 1/2”-5”, 5”-7”, 4 1/2”-5 1/2”) with a single assembly, reducing the need for frequent ram replacements and improving operational efficiency.

Secondary Sealing Function: Equipped with a secondary sealing device to supplement the primary sealing system, allowing on-site sealing maintenance without disassembling the BOP, enhancing operational safety and uptime.

Structural Features

The 2FZ35-105UMK and FZ35-105UMK Ram BOPs feature a robust structural design optimized for high-pressure and anti-sulfur performance, with key characteristics including:

Modular Ram Assembly: Ram bodies, rubber cores, and tool bits are designed as modular components, enabling quick disassembly and replacement. The ram assembly uses high-quality alloy steel for the body and nitrile rubber (NBR) for cores, ensuring resistance to H₂S corrosion and wear.

Main Piston Assembly: The integrated main piston assembly (C23.08.00) consists of a piston, piston rod, support rings, and sealing elements, providing stable hydraulic actuation for ram opening and closing. Precision-machined surfaces and multi-layer sealing (U-seals, O-rings) prevent hydraulic fluid leakage and ensure smooth operation.

Middle Flange Sealing System: Utilizes a floating seal assembly (C23.17.00) with end face and side sealing rings, achieving reliable sealing between the BOP housing and middle flange to withstand high wellbore pressures.

Anti-Sulfur Material Selection: All structural components in contact with sour media are manufactured from anti-sulfur alloy steel, complying with NACE MR0175/ISO 15156 standards to prevent sulfide stress cracking (SSC) in H₂S-containing environments.

Hydraulic Actuation Compatibility: Designed to integrate with standard well control hydraulic systems, ensuring synchronized operation with other BOP components (e.g., annular BOPs) for comprehensive well control.

Applicable Operating Conditions

These Ram BOP models are engineered for use in onshore and offshore oil and gas drilling operations, particularly suited for the following conitions:

Pressure Range: Rated working pressure of 105 MPa (15,000 psi), suitable for high-pressure well drilling and completion operations.

Fluid Environment: Compatible with sour well fluids containing H₂S (up to NACE MR0175/ISO 15156 Class I standards), as well as conventional oil-based and water-based drilling fluids.

Wellbore Sizes: Accommodates drill pipe diameters from 2 3/8” to 10 3/4” through interchangeable ram assemblies, supporting vertical, deviated, and horizontal wells.

Operating Temperatures: Suitable for ambient temperatures ranging from -20°C to 120°C (-4°F to 248°F), adapting to both cold and high-temperature drilling environments.

Application Scenarios: Exploration and production wells, sour gas wells, high-pressure/high-temperature (HPHT) wells, and emergency well control operations.

Maintenance & Care Recommendations

Proper maintenance of 2FZ35-105UMK and FZ35-105UMK Ram BOPs is critical to ensuring operational reliability and extending service life. The following recommendations align with industry best practices and equipment technical specifications:

Regular Inspection: Conduct weekly visual inspections of ram assemblies, sealing elements, and hydraulic connections for signs of wear, corrosion, or leakage. Perform monthly disassembly inspections of rubber cores—replace cores with cracks, deformation, or excessive wear (typically every 3-6 months under normal operation).

Sealing System Maintenance: Check O-rings, U-seals, and support rings for damage or aging; replace all sealing elements every 6-12 months or after a blowout emergency. Apply secondary sealing grease (EM-09-01) to the secondary sealing device quarterly to ensure lubrication and sealing performance.

Hydraulic Component Care: Clean hydraulic piston rods and guide rings regularly to remove debris; apply anti-corrosion lubricant to prevent rust. Inspect one-way valves (2C01.07) and cocks (2C01.20) for blockages, ensuring unobstructed hydraulic flow.

Anti-Sulfur Maintenance: For sour well operations, conduct annual material testing of anti-sulfur components to verify resistance to SSC. Avoid using non-compliant replacement parts, as they may compromise structural integrity in H₂S environments.

Storage & Handling: When not in use, store ram assemblies and sealing parts in a dry, dust-free environment at 0°C to 25°C (32°F to 77°F). Avoid direct sunlight and contact with oil or chemical solvents that may damage rubber components.

Parts of pipe ram

Parts list of shear ram assembly

Parts list of variable diameter ram assembly

List of sealing parts for front rod of main piston

Parts list of secondary sealing device

List of sealing parts for tail rod of main piston

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

parts of FZ35-105UMK BOP

Field Fault Repair Cases

The following real-world cases provide practical references for troubleshooting common faults of 2FZ35-105UMK and FZ35-105UMK Ram BOPs, helping maintenance teams resolve issues efficiently:

Case 1: Pipe Ram Sealing Failure

Symptom: During well pressure testing, the 3 1/2” pipe ram failed to seal the annular space, resulting in pressure leakage. Root Cause: Front rubber core (2C16.01A.01) was worn unevenly due to prolonged contact with irregular pipe surfaces, and the top rubber core had minor cracks. Repair: Replaced both front and top rubber cores with genuine parts (P/N: 2C16.01A.01 and 2C16.01A.02.00H), cleaned the ram body sealing surface, and performed a pressure test at 105 MPa—sealing performance was restored. Preventive Measure: Increase the frequency of rubber core inspections for wells with irregular drill pipe surfaces.

Case 2: Shear Ram Cutting Inefficiency

Symptom: The shear ram failed to completely shear the 5 1/2” drill pipe during emergency testing. Root Cause: The lower tool bit (P/N: 644581-02-00-01) was dulled by previous use, and the shear ram body alignment was slightly off. Repair: Replaced the upper and lower tool bits, adjusted the ram body alignment using set screws (644582-01), and tested shear performance with a test pipe—complete cutting was achieved within the specified hydraulic pressure. Preventive Measure: Inspect tool bit sharpness after each shear operation and replace every 2-3 uses.

Case 3: Main Piston Hydraulic Leakage

Symptom: Hydraulic fluid leakage was observed at the main piston assembly (C23.08.00) during ram actuation. Root Cause: The U-seal (Φ370Xφ400X22/24) was damaged due to improper lubrication, and the support ring (Φ385×Φ400×2.75) was deformed. Repair: Disassembled the main piston, replaced the U-seal and support ring, applied hydraulic lubricant to the piston surface, and conducted a leakage test—no leakage was detected after 10 cycles of ram operation. Preventive Measure: Apply lubricant to sealing elements during each maintenance cycle and inspect support rings for deformation.

Case 4: Secondary Sealing Device Blockage

Symptom: The secondary sealing device failed to inject grease, preventing on-site sealing maintenance. Root Cause: The one-way valve (2C01.07) was blocked by contaminated grease, and the cock (2C01.20) had internal debris. Repair: Disassembled and cleaned the one-way valve and cock, replaced the contaminated secondary sealing grease with EM-09-01, and tested grease injection—smooth operation was restored. Preventive Measure: Use only specified grease and clean the secondary sealing system every 3 months.

FAQ (Frequently Asked Questions)

Procurement Guidance

The 2FZ35-105UMK and FZ35-105UMK Ram BOPs are critical to well control safety, and the selection of genuine, high-quality parts is essential to ensuring equipment performance and operational safety. We offer a full range of original replacement parts for these BOP models, including ram assemblies, sealing elements, tool bits, and hydraulic components—all compliant with NACE MR0175/ISO 15156 and industry high-pressure standards. Our parts are precision-manufactured to match the original equipment specifications, ensuring seamless compatibility and reliable performance in harsh drilling environments.

Whether you require routine replacement parts, emergency repair components, or technical support for parts selection, our team of well control experts is ready to assist. We provide tailored parts solutions based on your specific operating conditions (e.g., sour wells, HPHT wells) and equipment maintenance needs, helping you minimize downtime and maintain compliance with safety regulations. Contact us today to discuss your parts requirements and access professional procurement and technical support.

Conclusion

The 2FZ35-105UMK and FZ35-105UMK Ram BOPs play a pivotal role in oil and gas well control, and their reliable operation depends on proper parts selection, regular maintenance, and efficient troubleshooting. This guide provides comprehensive technical information, practical maintenance recommendations, and real-world repair cases to support maintenance teams in resolving technical issues and ensuring equipment integrity. By adhering to the specifications and best practices outlined herein, operators can extend the service life of their BOPs, reduce operational risks, and maintain compliance with industry safety standards. For genuine parts and professional support, partner with a trusted supplier to safeguard your well control operations.

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