1. Core Purpose & Application Overview
This documentation focuses on the BYJ70/35FQ no-killing operation device, tailored for oilfield operators, well maintenance teams, and drilling contractors engaged in downhole operations (0~2500m tubing depth). It addresses the pain point of formation damage from conventional killing operations, delivering pressure control stability (max. 35MPa) for safe, efficient well workovers. Ideal for onshore oil wells with 180mm wellhead vertical bore, it minimizes production loss and ensures compliance with API 16C pressure control standards.
2. Technical Parameters Classification
2.1 Basic Model & Well Adaptation Parameters
These parameters define the device’s compatibility with well conditions, solving mismatched wellhead and depth issues that cause operational delays. Critical for onshore wells, they ensure seamless integration with 180mm wellheads and 0~2500m tubing strings, maximizing operational versatility.
No. | Parameter Name | Specification | Material/Standard | Main Wear Causes | Damage Prevention Notes |
1 | Model | BYJ70/35FQ | Custom-engineered for no-killing operations | N/A (model-specific, non-wear part) | Verify model match with well operation requirements before installation; store in dry, dust-free environment. |
2 | Nominal depth of string (oil tube) | 0～2500m | API 5CT tubing compatibility | 1. Tubing friction during hoisting/lowering; 2. Corrosion from formation fluids. | 1. Use wear-resistant tubing protectors; 2. Analyze formation fluid corrosivity and apply anti-corrosion treatment. |
3 | Vertical bore dia. of wellhead | 180mm | Carbon steel Q235B (wellhead adapter) | 1. Impact from wellhead debris; 2. Erosion by high-velocity fluid. | 1. Clean wellhead thoroughly before connection; 2. Inspect adapter for wear monthly and polish if needed. |
2.2 Load & Speed Performance Parameters
These parameters determine the device’s lifting/pressing capacity, addressing insufficient load handling that risks equipment failure. Optimized for heavy-duty well workovers, they ensure stable operation at max. 675kN hoist load, boosting efficiency in high-load scenarios.
No. | Parameter Name | Specification | Material/Standard | Main Wear Causes | Damage Prevention Notes |
1 | Max. hoist load | 675 kN | High-strength alloy steel (hoist cylinder) | 1. Overload beyond rated capacity; 2. Uneven load distribution during hoisting. | 1. Strictly avoid overload; 2. Ensure tubing is centered to distribute load evenly. |
2 | Max. pressing-down load | 440 kN | Alloy steel 42CrMo (press cylinder) | 1. Sudden pressure spikes in hydraulic system; 2. Wear from continuous low-speed pressing. | 1. Install pressure relief valve to prevent spikes; 2. Avoid prolonged low-speed pressing; pause periodically to reduce heat buildup. |
3 | Max. hoist speed | 0.4m/s | Hydraulic drive system (API 675 compliant) | 1. Hydraulic oil contamination causing valve wear; 2. Excessive speed leading to mechanical impact. | 1. Filter hydraulic oil regularly (per API 421); 2. Operate at medium speed for most tasks; avoid full-speed hoisting. |
4 | Max. pressing-down speed | 0.6m/s | Hydraulic control valve (ISO 4401) | 1. Valve spool wear from contaminated oil; 2. Speed fluctuations causing component fatigue. | 1. Replace hydraulic filter every 500 operating hours; 2. Maintain stable speed via control panel, avoid frequent speed changes. |
2.3 Hydraulic & Mechanical Structure Parameters
Key for hydraulic system stability and structural integrity, these parameters resolve leaks and structural deformation issues. Compliant with ISO 1219 standards, they ensure the device withstands 35MPa working pressure, critical for high-pressure well operations.
No. | Parameter Name | Specification | Material/Standard | Main Wear Causes | Damage Prevention Notes |
1 | Max. working pressure | 35 MPa | Stainless steel 316L (pressure components) | 1. Hydraulic oil oxidation causing seal hardening; 2. Pressure cycling fatigue. | 1. Replace hydraulic oil every 1000 hours; 2. Avoid frequent pressure cycling; maintain stable working pressure. |
2 | Cylinder stroke | 3.5m | Hard chrome-plated steel (cylinder rod) | 1. Scratches from external debris; 2. Seal wear from rod surface corrosion. | 1. Install rod protector when not in use; 2. Clean rod surface before operation and apply anti-rust oil. |
3 | Working pressure of hydraulic system | 21MPa | Hydraulic hoses (SAE 100R13) | 1. Hose aging from high temperature; 2. Abrasion from contact with sharp objects. | 1. Keep hydraulic system temperature below 60℃; 2. Use hose protectors at contact points. |
2.4 Power & Dimensional Parameters
These parameters ensure power supply stability and on-site adaptability, solving insufficient power and space constraints. The 380kW diesel engine meets high-load demands, while compact dimensions fit standard wellsite layouts, enhancing operational flexibility.
No. | Parameter Name | Specification | Material/Standard | Main Wear Causes | Damage Prevention Notes |
1 | Diesel engine power | 380kW | Diesel engine (GB 20891-2014 emission standard) | 1. Poor fuel quality causing injector wear; 2. Lack of regular oil changes. | 1. Use diesel fuel meeting GB 252-2015; 2. Change engine oil every 250 operating hours. |
2 | Overall dimensions | 3040mm×2307mm×6197mm | Carbon steel frame (painted with anti-corrosion coating) | 1. Corrosion from wellsite moisture; 2. Impact damage during transportation. | 1. Touch up paint on scratches immediately; 2. Use shock-absorbing pads during transportation and fix firmly. |
3. On-Site Fault Repair Cases
Case 1: Hydraulic System Pressure Drop (35MPa Working Pressure Scenario)
Scenario: During a 2000m tubing operation, the BYJ70/35FQ device experienced sudden hydraulic pressure drop, failing to maintain 35MPa working pressure. Root Cause: Hydraulic oil contamination (per API 421) caused seal wear in the pressure valve.Repair: Replaced contaminated oil and pressure valve seals (316L material), cleaned the filter. Prevention: Filter oil weekly and replace filter core every 500 hours.
Case 2: Cylinder Rod Scratching Leading to Leakage
Scenario: After well workover in a dusty wellsite, the 3.5m stroke cylinder leaked hydraulic fluid. Root Cause: External debris scratched the hard chrome-plated rod, damaging the seal. Repair: Polished the rod surface and replaced the seal. Prevention: Installed a rod protector and cleaned the wellsite before operation.
Case 3: Diesel Engine Power Loss Under High Load
Scenario: When hoisting 600kN load (near max. 675kN), the 380kW diesel engine lost power.Root Cause: Poor fuel quality clogged injectors (violating GB 252-2015). Repair: Cleaned injectors and refueled with qualified diesel. Prevention: Test fuel quality before use and add fuel stabilizer.
4. FAQ
Question | Answer |
What hydraulic oil grade is suitable for the BYJ70/35FQ device? | Use ISO VG 46 anti-wear hydraulic oil (meets ISO 6743/4) for the 21MPa system. It resists oxidation and wear, ensuring stable operation at 60℃ max temperature. Avoid mixing different grades. |
How to verify if the device can adapt to my well’s wellhead diameter? | Check if your wellhead vertical bore diameter is 180mm (matching the device’s parameter). For non-standard wellheads, use a custom Q235B adapter compliant with API 6A to ensure sealing and load-bearing capacity. |
What is the service life of the cylinder rod under normal operation? | With proper maintenance (cleaning, anti-rust treatment, protector use), the hard chrome-plated rod has a service life of 3000+ operating hours. Avoid debris contact and excessive pressure to extend lifespan. |
5. Procurement Guidance & Call to Action
The BYJ70/35FQ no-killing operation device is a critical solution for onshore oil wells (0~2500m depth), complying with API 16C, ISO 1219, and GB standards. It eliminates formation damage from killing operations, boosts workover efficiency, and reduces production loss—backed by reliable load-bearing (675kN) and pressure control (35MPa) performance.
We provide 100% genuine parts and technical documentation, ensuring the device meets your well’s specific requirements. Our team offers pre-purchase compatibility checks, on-site maintenance guidance, and fault troubleshooting support to maximize operational uptime. All parameters adhere to industry standards, providing a clear procurement and technical reference for your operations.
Choose the BYJ70/35FQ device for safe, efficient no-killing operations. Contact us today to discuss your well conditions and procurement needs. We will tailor solutions to optimize your well workover processes, backed by a commitment to quality and compliance with global oilfield standards.
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