Drill string conveying equipment
Technical Specifications (Complete System)
| Parameter | DSC-1.5 | DSC-2.0 | DSC-3.0 | DSC-5.0 | DSC-7.0 |
|---|---|---|---|---|---|
| Platform height (m) | 1.0 – 3.5 | 3.5 – 4.5 | 4.5 – 5.5 | 5.5 – 6.5 | 6.0 – 7.0 |
| Catwalk length (m) | 8 / 10 | 10 / 12 | 12 / 14 | 14 / 16 | 16 / 18 |
| Max pipe OD (in) | 4.5 | 7 | 13.375 | 20 | 20 |
| Max joint weight (kg) | 1,500 | 2,000 | 3,000 | 5,000 | 7,000 |
| Conveyor speed (m/s) | 0 – 0.5 | 0 – 0.5 | 0 – 0.5 | 0 – 0.4 | 0 – 0.4 |
| Tilt angle range | 0 – 80° | 0 – 80° | 0 – 90° | 0 – 90° | 0 – 90° |
| Hydraulic pressure (MPa) | 20 | 20 | 20 | 20 | 20 |
| Hydraulic flow (L/min) | 35 | 35 | 35 | 45 | 60 |
| Power pack (kW) | 11.5 | 11.5 | 11.5 | 18.5 | 22.0 |
| Control voltage | 24V DC | 24V DC | 24V DC | 24V DC | 24V DC |
| Weight – catwalk (kg) | 3,200 | 3,600 | 4,200 | 5,500 | 6,800 |
| Operating temp (°C) | -20 to +50 | -20 to +50 | -20 to +50 | -20 to +50 | -20 to +50 |
| Arctic option | -45 | -45 | -45 | -45 | -45 |
| Certifications | API 8C, CE, GOST | API 8C, CE, GOST | API 8C, CE, GOST | API 8C, CE, GOST | API 8C, CE, GOST |
Product Types – Choose Your Configuration
| Model | Best For | Key Characteristics |
|---|---|---|
| DSC-1.5 | Workover rigs, shallow drilling (ZJ20-ZJ30) | Lightweight, short catwalk, truck‑mountable |
| DSC-2.0 | Small to medium land rigs (ZJ30-ZJ40) | Most common for conventional fields |
| DSC-3.0 | Medium‑deep rigs (ZJ50-ZJ70) | Best seller – handles 95% of drill pipe & casing |
| DSC-5.0 | Heavy drilling, large casing (ZJ70-ZJ90) | Reinforced structure, dual lift cylinders |
| DSC-7.0 | Ultra‑deep, super‑heavy (ZJ90-ZJ120) | Maximum capacity for drill collars & riser |
| DSC-OS | Offshore platform / jack‑up | Marine coatings, Ex‑rated, DNV options |
| DSC-AR | Arctic / low‑temperature regions | Heated hydraulics, –45°C seals |
Special configurations:
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Trailer‑mounted – For rigs that move frequently; includes highway axles and lights.
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Containerized – For fly‑in / helicopter operations; fits 20ft ISO container.
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Electric drive – No hydraulic HPU; AC motor + VFD for quieter, cleaner operation.
Applications – Where Our Equipment Delivers Most Value
| Operation | Without Conveyor | With Conveyor | Benefit |
|---|---|---|---|
| Tripping in (make connections) | 4‑5 min; 5‑6 crew on catwalk | 2‑2.5 min; 1 operator in cabin | 50% faster, 80% fewer people exposed |
| Tripping out (lay down pipe) | Manual dragging, high fatigue | Auto reverse – pipe laid down without touching | Eliminates back injuries |
| Running heavy casing (13‑3/8″) | Crane + tag lines, high risk | Skid arm tilts & lowers precisely | No slings, no dropped loads |
| Pad drilling (moving between wells) | Re‑install catwalk each move | Quick disconnect, move with rig | Hours saved per move |
| Offshore / cramped deck | No space for manual handling | Remote operation from cabin | Uses minimal deck area |
| Arctic winter | Crew exposed to -40°C | Operation from heated cabin | Consistent speed, frostbite eliminated |
Real‑world result: In Sinopec’s Fuling shale gas field (300+ wells, 150+ rigs), the introduction of drill string conveying equipment reduced catwalk‑related incidents by 72% and shaved an average of 1.5 hours per 1,000m of tripping.
Why Choose SJ Petro for Drill String Conveying Equipment?
1. We Manufacture, Not Just Assemble
Unlike many "suppliers” who buy from anonymous factories and relabel, we are the original equipment manufacturer. Our hydraulic cylinders, chain drives, PLC cabinets, and control software are all designed and built in‑house. You get full traceability, consistent quality, and direct engineering support.
2. Field‑Proven Under Sinopec’s Own Rigs
Our equipment has been used to handle millions of pipe joints in China’s toughest basins – shale gas, desert deep wells, offshore platforms, and arctic exploration. We don’t need beta testers; we already have decades of refinement.
3. Safety Is Not an Option – It’s Designed In
We comply with API 8C (drilling equipment) and ISO 12100 (machine safety). Our systems include load‑holding valves, redundant brakes, emergency stop lanyards, and audible pre‑movement alarms. Many customers buy our equipment specifically to reduce their TRIR (Total Recordable Incident Rate).
4. Quick ROI – Proven Payback Under 12 Months
With labor savings (2‑3 fewer crew on catwalk), faster connections (30‑50% time reduction), and eliminated pipe damage & injury costs, the investment typically pays for itself in less than one drilling campaign. We can provide a customized ROI calculation with your quote.
5. Global Support – Not Just a Shipment
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Spare parts hubs in Dubai, Houston, and Singapore – common wear parts in stock.
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Remote diagnostics via built‑in PLC modem – we can often fix issues without a site visit.
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Field service available – our technicians can travel to your location for installation, training, or repairs.
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Training included – 3 days on‑site for your operators and maintenance crew.
6. Backed by Sinopec Group – Financial & Technical Strength
As a wholly‑owned subsidiary of Sinopec Oilfield Equipment Corporation, we have the resources to honor warranties, supply parts for decades, and continuously improve our products. You’re not buying from a one‑man shop that might disappear.
7. Flexible Commercial Options
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Outright purchase – Standard 30/40/30 payment terms.
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Leasing – Operating or finance lease (12‑60 months).
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Rental – Short‑term rental for campaigns (minimum 3 months).
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Trial program – Rent with option to buy after 6 months.
FAQ – Drill String Conveying Equipment
Q1: What is the typical delivery lead time?
A: Standard models (DSC-1.5 to DSC-3.0) are available in 30‑45 days from order. Larger models (DSC-5.0, DSC-7.0) and special versions (offshore, arctic) take 60‑90 days. Expedited production possible for an additional fee.
Q2: Can the system be installed on an existing rig without major modifications?
A: Yes. Our catwalk mounts to the rig substructure or a separate concrete foundation. We provide custom mounting brackets for most mast brands (Derrick, National, etc.). The hydraulic power unit can be placed anywhere within 20m of the catwalk. No structural changes to the rig are required.
Q3: What maintenance does the equipment require?
A: Very low. Daily: visual inspection, grease bearings (15 points). Monthly: check chain tension, replace wear strips if needed. Yearly: change hydraulic oil, replace filters. Chain replacement every 5,000 hours (~2‑3 years). We provide a laminated maintenance card with every system.
Q4: How does the system handle different pipe lengths (Range 2 vs Range 3)?
A: The catwalk length is selected to accommodate your longest single joint (Range 3 = 13.5m). Sensors detect when the pipe is fully on the conveyor; the system will not start the tilt until the entire joint is past the safety gate.
Q5: Can the system be operated by one person?
A: Yes. The driller or a dedicated operator can run the entire pipe handling cycle from the wireless pendant or touchscreen. The system automatically sequences: pick pipe → convey → tilt → present. The operator only pushes "cycle start.”
Q6: What if I have an unusually high platform (over 7m)?
A: We can design a longer catwalk (up to 24m) with a steeper angle (up to 40°). The hydraulic cylinders and chain drive are upgraded accordingly. Contact our engineering team with your platform height – we’ve supplied systems for 9m rigs.
Q7: Do you provide a warranty?
A: Standard warranty: 18 months from shipment or 12 months from commissioning (whichever first). Extended warranty available (additional 12‑24 months) for 5‑10% of equipment cost.
Q8: Can I visit a rig where your equipment is operating before I buy?
A: Yes. For serious buyers, we can arrange a visit to a working rig in China (typically Sichuan or Xinjiang) where our conveyor system is in daily use. Travel support is available.
Q9: What documentation do you provide for customs and API certification?
A: We supply full documentation: API 8C certificate, material certs (EN 10204 3.1), weld maps, hydraulic schematic, electrical diagram, CE declaration (if required), and a detailed packing list. Third‑party inspections (SGS, BV, DNV) can be arranged at your cost.
Q10: Do you offer a trade‑in for my old manual catwalk?
A: Yes. We can provide a credit (typically $5,000‑$15,000 depending on condition and weight) for your existing manual or semi‑automatic catwalk system. We’ll scrap it responsibly.
