1. Core Purpose & Application Overview
This documentation covers Bomco drawworks series—JC10B, JC15DB, JC30B, JC40B, JC50B, JC50D, JC70B, JC70D—designed for onshore oilfield drilling contractors and well maintenance teams. It addresses wear, load mismatch, and safety risks, delivering API 7K-compliant performance for 10~70 ton-class operations. Ideal for diverse well depths, it ensures stable hoisting and braking, minimizing downtime in conventional drilling scenarios.
2. Technical Parameters Classification
2.1 Model, Power & Load Capacity Parameters
These core parameters define operational limits, solving power insufficiency and load overload issues that damage gearboxes. Critical for matching drill string weights, they adhere to API 7K load rating standards, ensuring reliable performance across 210~1470kW power ranges.
No. | Parameter | JC10B | JC15DB | JC30B | JC40B | JC50B | JC50D | JC70B | JC70D | Material/Standard | Main Wear Causes | Damage Prevention Notes |
1 | Model | JC10B | JC15DB | JC30B | JC40B | JC50B | JC50D | JC70B | JC70D | Bomco custom drawworks design (API 7K) | N/A (non-wear component) | Verify model matches well depth and drill string load; store in dry, dust-free environment to protect components. |
2 | Rated Input Power (kW) | 210 | 500 | 440 | 735 | 1100 | 1100 | 1470 | 1470 | 42CrMo alloy steel gear train | 1. Overloading beyond rated power; 2. Lubricant degradation from high temperature. | 1. Avoid power overload; 2. Use API 5GL lubricant and change every 1200 operating hours; monitor oil temperature. |
3 | Max. Pulling of Fast-line (kN) | 80 | 150 | 210 | 280 | 350 | 350 | 487 | 487 | High-strength carbon steel fast-line assembly | 1. Shock loads during sudden hoisting; 2. Fatigue from repeated load cycles. | 1. Operate at steady speeds to avoid shock loads; 2. Inspect for fatigue cracks weekly per API 9A. |
2.2 Wire Rope, Drum & Sand Drum Specifications
These parameters ensure rope-drum compatibility, resolving slippage and wear issues that halt drilling. Sand drum-equipped models (JC50D/JC70D) address sand handling needs in complex wells, with all components adhering to API 8C durability standards.
No. | Parameter | JC10B | JC15DB | JC30B | JC40B | JC50B | JC50D | JC70B | JC70D | Material/Standard | Main Wear Causes | Damage Prevention Notes |
1 | Diameter of Wire Rope (mm) | 22 | 26 | 29 | 32 | 35 | 35 | 38 | 38 | Galvanized steel wire rope (API 9A) | 1. Abrasion from drum grooves; 2. Corrosion from wellsite moisture/salt. | 1. Align rope with drum grooves; 2. Apply anti-corrosion grease daily; replace rope if 6+ broken strands are found. |
2 | Drum Size (D×W, mm) | 400×650 | 473×900 | 560×1304 | 640×1208 | 685×1160 | 770×1310 | 770×1310 | 770×1310 | Hard chrome-plated carbon steel drum | 1. Groove wear from rope friction; 2. Deformation from uneven winding. | 1. Monitor groove depth monthly; 2. Ensure uniform rope winding to distribute stress evenly. |
3 | Sand Drum Size (D×W, mm) | - | - | - | - | - | 400×1320 | - | 400×1460 | Carbon steel with anti-abrasion lining | 1. Sand particle abrasion; 2. Lining peeling from impact. | 1. Screen sand to remove large particles; 2. Inspect lining monthly and repair peeling areas. |
4 | Sand Drum Capacity (L) | - | - | - | - | - | 5000 | - | 7000 | Same as sand drum material | 1. Overfilling causing structural stress; 2. Corrosion from wet sand. | 1. Avoid exceeding rated capacity; 2. Empty and clean drum after use to prevent wet sand corrosion. |
2.3 Speed, Auxiliary Brake & Physical Parameters
These parameters optimize operational efficiency and safety, solving brake failure and space constraint issues. DWS-series auxiliary brakes ensure reliable stopping power, while dimensions/weight fit standard rig layouts, complying with API 7K safety norms.
No. | Parameter | JC10B | JC15DB | JC30B | JC40B | JC50B | JC50D | JC70B | JC70D | Material/Standard | Main Wear Causes | Damage Prevention Notes |
1 | Hoisting Speeds | 2F+2R | 2F+2R | 4F | 4F+2R | 4F(6F)+2R | 4F+4R | 4F(6F)+2R | 4F+4R | Hydraulic speed control system (ISO 4401) | 1. Valve wear from contaminated hydraulic oil; 2. Gear wear from frequent speed changes. | 1. Filter hydraulic oil every 500 hours; 2. Avoid frequent speed switching to reduce gear impact. |
2 | Speeds for Cathead Shaft | 2 | - | 2 | 2 | - | 2 | - | 2 | Alloy steel cathead shaft | 1. Wear from cable friction; 2. Fatigue from continuous load. | 1. Use cable protectors; 2. Inspect shaft for wear monthly and lubricate bearings. |
3 | Auxiliary Brake | - | DWS15 | DWS40 | DWS40 | DWS50 | DWS50 | DWS70 | DWS70 | Hydraulic disc brake (API 7K) | 1. Brake pad wear from frequent use; 2. Hydraulic fluid leakage. | 1. Replace pads when thickness <5mm; 2. Inspect seals monthly and replace contaminated fluid. |
4 | Overall Dimensions (L×W×H, mm) | 7390×2500×2410 | 4500×2400×2500 | 6000×2850×2380 | 6300×2628×2699 | 6760×2565×2881 | 7190×4335×3216 | 7100×2920×2945 | 7370×4335×3216 | Q355B welded steel frame | 1. Corrosion from wellsite chemicals; 2. Impact damage during transport. | 1. Apply anti-corrosion coating annually; 2. Use shock-absorbing pads during transport. |
5 | Weight (kg) | 9819 | 11000 | 27300 | 28000 | 34203 | 49600 | 46050 | 55809 | High-strength steel components | 1. Fastener loosening from vibration; 2. Structural fatigue from uneven installation. | 1. Retorque fasteners every 300 hours (API RP 7G); 2. Ensure level installation to distribute weight. |
3. On-Site Fault Repair Case
Case: JC50D Drawworks Sand Drum Lining Wear & Brake Failure
Scenario: During sand-prone well drilling, the JC50D’s sand drum leaked sand, and the DWS50 auxiliary brake lost efficiency. Root Cause: Sand particle abrasion damaged the drum lining; hydraulic fluid contamination (violating ISO 4401) caused brake seal wear. Repair: Replaced drum lining, flushed brake system, and refilled with ISO VG 46 fluid. Prevention: Install sand screen and filter hydraulic fluid monthly.
4. FAQ
Question | Answer |
What’s the difference between JC50B and JC50D? How to choose? | JC50D has a 5000L sand drum for sand-handling wells, while JC50B does not. Choose JC50D for sand-prone formations; JC50B for conventional wells. Both share 1100kW power and 350kN pull capacity, complying with API 7K. |
How to maintain DWS-series auxiliary brakes for Bomco drawworks? | Inspect brake pads weekly, replace hydraulic fluid every 500 hours (ISO VG 46), and clean cooling systems. For DWS70 (JC70 series), test brake pressure monthly to ensure it meets API 7K safety limits (35MPa max). |
5. Procurement Guidance & Call to Action
Bomco JC-series drawworks (JC10B to JC70D) are API 7K-compliant solutions for 10~70 ton-class onshore drilling. They address diverse well conditions—from conventional to sand-prone formations—with tailored power, load, and sand-handling capabilities, ensuring durability and safety.
We provide genuine Bomco parts, detailed compatibility guides, and technical support to optimize your operations. Our team offers pre-purchase model selection advice based on well depth, formation type, and load requirements, ensuring you get the right drawworks for your project.
Choose Bomco JC-series drawworks for reliable, efficient drilling performance. Contact us today to discuss your project’s unique needs. We will tailor a solution to maximize uptime, comply with global oilfield standards, and support your operational goals.
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