Core Purpose & Equipment Adaptation
This guide is tailored for FH35-35/70 steam-heated annular blowout preventers (BOPs), critical for high-temperature oil and gas drilling operations. It addresses the needs of drilling contractors, maintenance technicians, and procurement teams requiring reliable parts for steam-heated well control. The guide ensures API-compliant part management, mitigates downtime from high-temperature wear, and optimizes maintenance efficiency in harsh downhole environments.
1. FH35-35/70 Annular BOP Main Parts
These core parts form the FH35-35/70 BOP’s structure, enduring high steam temperatures and pressure. They ensure annular sealing integrity, with critical components resistant to thermal fatigue—vital for safe drilling in high-temperature wells.
No. | Description | Part No./Model | Material | Main Wear Causes | Usage Precautions |
1 | Bonnet | FH3535.03-00 | Alloy Steel | Thermal expansion mismatch; high-pressure impact | Preheat uniformly before steam operation; inspect thread integrity post-pressure cycles |
2 | Packer | FW1305.06-00A | High-Temp Rubber Composite | Thermal aging; abrasive fluid erosion; over-compression | Avoid exceeding 120℃ operating temp; clean fluid to remove abrasives before use |
3 | Seal-Adapter Ring I.D. | FW1305.11-00 | Fluororubber | Steam-induced aging; radial pressure deformation | Store in low-humidity environment; replace if surface cracks appear |
4 | Adapter Ring | FW1305-10A | Carbon Steel | Thermal fatigue; corrosive steam oxidation | Apply high-temp anti-corrosion coating; check for warpage quarterly |
5 | Seal-Piston O.D. | FW1305.16-00 | Nitrile Rubber | Piston reciprocation friction; thermal hardening | Lubricate with high-temp grease; avoid dry actuation |
6 | Seal-piston I.D. | FW1305.13-00 | Nitrile Rubber | Internal pressure pulsation; thermal expansion mismatch | Monitor piston actuation speed; avoid rapid pressure changes |
7 | Shell | H21.01.00 | Alloy Steel | External impact; long-term high-temp stress | Inspect for stress cracks via ultrasonic testing; avoid mechanical collision |
8 | Cap Nut | FW1305-03 | Carbon Steel | Thermal loosening; thread corrosion | Retorque after each steam cycle; use anti-seize compound on threads |
9 | O-ring | GB1235-76 85×5.7 | Fluororubber | Thermal aging; compression set | Replace every 6 months; avoid over-compression during installation |
10 | Stud | FW1305-04 | Alloy Steel | Tensile stress fatigue; steam corrosion | Check for thread deformation monthly; replace if bent |
11 | Shackle | 沪/JB44-66 Shackle 9 | Carbon Steel | Load-bearing fatigue; surface rust | Do not exceed rated load; clean and grease after use |
12 | O-ring | FW1305-07 | Fluororubber | High-temp steam erosion; edge abrasion | Install with protective sleeve to avoid sharp edges; inspect pre-operation |
13 | O-ring | FW1305-09 | Fluororubber | Thermal cycling aging; chemical fluid corrosion | Test chemical compatibility with drilling fluid; replace if swollen |
14 | Wear Ring- Adapter Ring | FH3535NL-11 | Polyurethane | Adapter ring rotation friction; impact damage | Monitor wear depth; replace when thickness reduces by 3mm |
15 | Wear Ring- Piston | FH3535NL-16 | Polyurethane | Piston reciprocation; thermal softening | Maintain operating temp below 110℃; avoid piston misalignment |
16 | Piston | FW1305-12A | Carbon Steel | Internal pressure fatigue; surface corrosion | Polish surface regularly; inspect for pitting corrosion |
17 | Wear Ring- Shell | FH3535NL-15 | Polyurethane | Shell contact friction; thermal degradation | Lubricate with high-temp oil; check for cracks quarterly |
18 | O-ring | FW1305-08 | Fluororubber | Steam leakage erosion; compression fatigue | Ensure proper seating during installation; replace if leakage occurs |
19 | Pipe Plug | 2C01.21 | Carbon Steel | Thread corrosion; impact damage | Seal threads with anti-corrosion tape; store in dry place |
20 | NPT 1/2"Hexagonal socket head plug | 2C01.36 | Alloy Steel | Thread wear; steam corrosion | Use torque wrench for installation; avoid over-tightening |
2. FH35-35/70 Annular BOP One-Year Spare Parts
These high-wear spares are critical for minimizing downtime in FH35-35/70 BOP operations. Selected for frequent failure under steam heating, they ensure continuous well control in high-temperature drilling scenarios.
No. | Description | Part No./Model | Material | Main Wear Causes | Usage Precautions |
1 | Seal-Adapter Ring I.D. | FW1305.11-00 | Fluororubber | Steam-induced aging; radial pressure deformation | Store in low-humidity environment; replace if surface cracks appear |
2 | Seal-Piston O.D. | FW1305.16-00 | Nitrile Rubber | Piston reciprocation friction; thermal hardening | Lubricate with high-temp grease; avoid dry actuation |
3 | Seal-piston I.D. | FW1305.13-00 | Nitrile Rubber | Internal pressure pulsation; thermal expansion mismatch | Monitor piston actuation speed; avoid rapid pressure changes |
4 | O-ring | GB1235-76 85×5.7 | Fluororubber | Thermal aging; compression set | Replace every 6 months; avoid over-compression during installation |
5 | O-ring | FW1305-07 | Fluororubber | High-temp steam erosion; edge abrasion | Install with protective sleeve to avoid sharp edges; inspect pre-operation |
6 | O-ring | FW1305-09 | Fluororubber | Thermal cycling aging; chemical fluid corrosion | Test chemical compatibility with drilling fluid; replace if swollen |
7 | Wear Ring- Adapter Ring | FH3535NL-11 | Polyurethane | Adapter ring rotation friction; impact damage | Monitor wear depth; replace when thickness reduces by 3mm |
8 | Wear Ring- Piston | FH3535NL-16 | Polyurethane | Piston reciprocation; thermal softening | Maintain operating temp below 110℃; avoid piston misalignment |
9 | Wear Ring- Shell | FH3535NL-15 | Polyurethane | Shell contact friction; thermal degradation | Lubricate with high-temp oil; check for cracks quarterly |
10 | O-ring | FW1305-08 | Fluororubber | Steam leakage erosion; compression fatigue | Ensure proper seating during installation; replace if leakage occurs |
3. Field Fault Repair Case
Case: Piston Seal Leakage Under Steam Operation
Symptom: FH35-35/70 BOP showed hydraulic fluid leakage during steam-heated drilling (115℃). Root Cause: Seal-Piston O.D. (FW1305.16-00) suffered thermal hardening and friction wear due to insufficient high-temp lubrication. Repair: Replaced O-rings with genuine FW1305.16-00 parts, applied high-temp grease (complying with API 16A § 5.3), and cleaned piston surface. Preventive Measure: Lubricate piston seals every 8 hours of steam operation; monitor fluid temperature to avoid exceeding 120℃.
4. FAQ
Question | Answer |
Why can’t common rubber seals replace fluororubber ones for this BOP? | Fluororubber (per GB/T 5574-2008) resists 150℃ high temp and steam erosion, while common rubber hardens or decomposes above 80℃. Using substitutes causes rapid leakage and BOP failure in steam-heated scenarios. |
How often should wear rings be inspected for replacement? | Polyurethane wear rings (FH3535NL series) should be inspected monthly. Replace when wear depth reaches 3mm or surface cracks appear—excessive wear causes piston misalignment and seal damage. |
What is the impact of thermal cycling on cap nuts and studs? | Thermal cycling causes expansion and contraction, leading to thread loosening. Retorque cap nuts (FW1305-03) and studs (FW1305-04) after each steam cycle, and replace if thread deformation is detected to avoid bonnet leakage. |
5. Procurement Guidance
Genuine parts are critical for FH35-35/70 BOP’s safe operation under high-temperature conditions. We supply all listed parts, including core components and one-year spares, fully compliant with API 16A and GB standards. Each part comes with traceable material certificates to ensure compatibility and durability. Our technical team provides personalized spare parts inventory plans based on your drilling frequency and operating conditions. Contact us to secure authentic parts that mitigate downtime and maintain well control integrity in steam-heated drilling environments.
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