Crane Selection Guide for Oilfield Equipment Manufacturing
Oilfield equipment manufacturing (drilling rigs / workover rigs / fracturing trucks / wellhead equipment) represents the pinnacle of heavy machinery fabrication. Recommended configuration: QD Type double-girder 20–100t (heavy components) + LD Type overhead 10–32t (medium components) + BZD jib crane 3–10t. Kelude's oilfield equipment solutions cover all four equipment categories: drilling rigs, workover rigs, fracturing trucks, and wellhead equipment.
Drilling Rig Manufacturing Cranes — Heavy Components: Mast, Winch, Rotary Table
Core components of drilling rigs (land and offshore): the mast (truss structure, 20–50m high, 10–50t), the winch (with drum, brake, and gearbox, 5–20t), the rotary table (with drive and bearings, 3–10t), and the mud pump (10–30t). Drilling rig fabrication is characterized by heavy individual components, extensive welding work, and large physical dimensions. The mast must be welded in sections, pre-assembled, and then disassembled for shipment.
Recommended model: QD Type double-girder overhead crane, 32–100t / span 20–30m / lifting height 14–20m. Mast turnover is a critical operation in rig manufacturing — the truss must be flipped 180° during welding to access both faces, requiring synchronized dual main hooks on the QD crane. Winch and rotary table assembly demand precision alignment (gear mesh clearance 0.1–0.3mm).
Price reference: QD double-girder 50t/24m: approximately $66,600–$119,900 per unit. Kelude's drilling rig solution includes dual main hooks (electrically adjustable spacing 1–3m) + anti-sway control + variable frequency micro-speed.
Workover Rig Manufacturing Cranes — Mast, Drum, and Chassis Welding
Key components of workover rigs (truck-mounted or skid-mounted): the mast (truss + hydraulic cylinder, 5–15t), the drum (wound with wire rope, 2–8t), and the chassis (truck or skid frame, 5–20t). Workover rig manufacturing is defined by vehicle integration — all components must ultimately be mounted onto a truck chassis, demanding high positioning accuracy between parts.
Recommended model: QD Type double-girder 16–32t / span 18–24m + LD Type overhead 10–16t. The QD handles mast (5–15t) and chassis (5–20t) welding and assembly; the LD manages drum (2–8t) and hydraulic system (1–3t) lifting and transport.
Price reference: QD double-girder 20t/20m: approximately $33,300–$59,900 per unit. Kelude's workover rig solution equips the mast welding station with a welding positioner (hydraulic turnover 0–180°).
Fracturing Truck Manufacturing Cranes — Large Piston Pump and Chassis Integration
The core of a fracturing truck (truck-mounted fracturing equipment): the power system (diesel engine + gearbox, 5–15t), the piston pump (five-cylinder or three-cylinder, 3–10t), the high-pressure manifold (1–5t), and the control system (0.5–2t). The main challenge lies in the high-precision assembly of the piston pump — the clearance between plunger and cylinder bore is ≤0.05mm, requiring precise alignment during installation.
Recommended model: LD Type overhead 10–20t + BZD jib crane 3–5t. The LD overhead crane handles the complete fracturing truck (15–35t) along the assembly line; the BZD jib crane provides precision alignment at the piston pump assembly station. The assembly line follows a flow layout: chassis on line → install power system → install piston pump → connect manifold → install control system → system commissioning.
Price reference: LD overhead 16t/22m: approximately $18,600–$33,300 per unit. Kelude's fracturing truck solution configures crane density to match assembly line takt time.
Wellhead Equipment Manufacturing Cranes — BOP and Christmas Tree Assembly
Wellhead equipment (Christmas tree / BOP / casing head / tubing head) is characterized by: ① concentrated weight (BOP 5–30t, Christmas tree 2–10t); ② high pressure ratings (5,000–20,000 psi); ③ specialized materials (Alloy Steel / Stainless Steel / duplex steel); ④ precision sealing surfaces (metal seal face roughness Ra≤0.4μm). During wellhead assembly, sealing surfaces (metal ring gaskets / flange seal grooves) require strict protection — any scratch can cause high-pressure seal failure.
Recommended model: LD Type overhead 10–32t / span 15–24m. All lifting spreaders that contact sealing surfaces must use non-metallic materials (nylon / polyurethane / rubber); wire rope must never come into direct contact with flange seal grooves. A turnover machine is recommended for the assembly area (rotating BOP / Christmas tree within 0–90° for easy access to bottom bolts and valves).
Price reference: LD overhead 16t/18m: approximately $15,900–$29,300 per unit. Kelude's wellhead solution includes dedicated protective lifting spreaders (nylon lining + polyurethane contact surfaces).
Oilfield Equipment Crane Configuration Comparison
| Equipment | recommended model | Capacity | Special Purposeconfiguration | reference price |
|---|---|---|---|---|
| Drilling Rig | QDDouble Girder Double Hook | 32~100t | Twin Main Hook/Derrick Handling | 50~9010,000 |
| workover rig | QD+LD | 16~32t+10~16t | Welding Positioner | 25~4510,000 |
| Fracturing Truck | LDoverhead type+BZD | 10~20t+3~5t | Piston Pumpprecision alignment | 14~2510,000 |
| Wellhead | LDoverhead type+turnover machine | 10~32t | Nylon Protection Lifting spreader | 12~2210,000 |
Key Parameters for Oilfield Equipment
Kelude Service Advantages for Oilfield Equipment
① Heavy-Duty Dedicated Line: Kelude manufactures QD double-girder cranes rated from 32t to 100t (up to 250t on request). Dual main hooks, anti-sway control, and variable frequency micro-speed drives come as standard — a configuration purpose-built for rig mast turnover and heavy structural component assembly.
② Anti-Corrosion Coating System: Epoxy zinc-rich primer, epoxy MIO intermediate coat, and polyurethane topcoat deliver a total dry film thickness of ≥180μm. Motors are rated IP55, and the control box is positive-pressure dustproof, meeting NACE MR0175/ISO 15156 requirements for H₂S service in oilfield environments.
③ Dedicated Protective Lifting Spreaders: The metal sealing surfaces of wellhead equipment are the most vulnerable points during lifting and transport. Kelude supplies complete protective spreader packages with nylon/polyurethane liners, along with turnover machine solutions.
FAQ
Q: What special environmental requirements do oilfield equipment manufacturers place on cranes?
A: Oilfield equipment workshops present a challenging environment: ① heavy welding fumes (masts, chassis, and large steel structural components require extensive welding, producing high fume concentrations); ② significant grinding dust; ③ paint overspray from anti-corrosion coating applied before delivery. Crane motors must have a minimum protection rating of IP54 (IP55 recommended), with a positive-pressure dustproof control box. Additionally, some oilfield equipment is exported to desert regions such as the Middle East and Africa, so the manufacturing workshops must also withstand the corrosive environments addressed by Saudi NACE standards — the crane steel structure requires an epoxy zinc-rich primer, epoxy MIO intermediate coat, and polyurethane topcoat with a total thickness of ≥180μm. Kelude's oilfield equipment package comes standard with IP55 protection and a 180μm coating system.
Q: How does dual-hook operation ensure safety during mast turnover?
A: Turning over a mast truss (20~50m long, 10~50t) is the highest-risk hoisting operation in rig manufacturing. The safe dual-hook procedure: ① two hooks lift the mast at both ends (lifting points positioned symmetrically about the center of gravity); ② slowly hoist the mast approximately 500mm off the ground to verify spreader and mast balance; ③ one hook raises while the other lowers (maintaining a constant center-of-gravity height) to complete the turnover (each cycle takes 5~10 minutes); ④ both motors are driven in coordination by a single controller throughout (speed differential ≤5%). Kelude's dual-hook synchronized system comes standard with torque limiting, speed synchronization, and real-time inclination angle display — if any of the three safety parameters exceeds its limit, the crane stops automatically.
Q: Why is micro-speed alignment required for piston pump assembly on fracturing trucks?
A: The clearance between the plunger and cylinder bore in a piston pump is only 0.03~0.05mm — about half the thickness of a human hair. Inserting the plunger at normal speed (>2m/min) causes it to strike the sealing surface and guide ring at the cylinder inlet, resulting in: ① scratched sealing surfaces (seal failure, pump pressure cannot reach rated capacity); ② guide ring deformation (increased plunger resistance and abnormal wear inside the cylinder). Correct operating speeds: ① approach phase at 0.5m/min (plunger more than 50mm from the cylinder inlet); ② alignment phase at 0.1~0.3m/min (once the plunger enters the cylinder inlet); ③ insertion phase at creep speed of 0.05~0.1m/min (as the plunger passes through the sealing rings inside the cylinder). Kelude's BZD jib crane can be fitted with a micro-speed controller for a minimum stable speed of 0.05m/min.
Q: What is the typical investment range for cranes in the oilfield equipment industry?
A: Using a mid-sized drilling rig + wellhead equipment factory as an example: ① Drilling rig workshop: 1 QD 50t/24m crane (approx. $66,600); ② Workover rig workshop: 1 QD 20t + 1 LD 10t crane (approx. $59,300); ③ Fracturing truck Assembly Line: 1 LD 16t + 2 BZD hoists (approx. $37,100); ④ Wellhead equipment area: 1 LD 16t crane + turnover machine (approx. $29,700). Total investment: approx. $222,500. Payback: mast turnover time cut from 60 minutes to 12 minutes (Double Hook vs. manual flipping); Piston Pump assembly rework rate reduced by 90% (Creep speed alignment); sealing surface damage rework reduced by 100% (nylon Lifting spreader protection). Payback period: approx. 18–24 months.
