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HZJ315DD Lightweight fixed offshore drilling rig

HZJ315DD Lightweight fixed offshore drilling rig

Most offshore fixed platform rigs are heavy, bulky, and demand major deck reinforcement. But not every platform has that luxury – especially older platforms or those in mature fields where deck space and crane capacity are tight.

Lightweight but No Compromise on Load：Rated maximum hook load: 3.150 kN (708.000 lbs) – enough for 3.000–4.000m drilling or deep workover. The drawworks delivers 1.100 kW (1.500 hp) via AC variable frequency drive, giving you full torque control at low speeds.

AC VFD Electric Drive – Smooth, Quiet, Reliable：No messy hydraulic lines or mechanical clutches. The full AC system provides stepless speed regulation, automatic pipe handling coordination, and dynamic braking. It’s also safer – fewer high-pressure oil leaks on your platform deck.

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Technical Specifications (HZJ315DD)

Parameter Metric Imperial
Model HZJ315DD HZJ315DD
Rig Type Lightweight fixed offshore drilling & workover rig –
Max. Hook Load 3,150 kN 708,000 lb
Drawworks Power 1,100 kW 1,500 hp
Drive System AC VFD (full electric) AC VFD
Top Drive 3,150 kN AC VFD top drive (optional integrated pipe handler) –
Mast Type Telescopic bootstrap mast, clear height 41 m (135 ft) –
Substructure Height 6.5 m (21.3 ft) – adaptable –
Module Weight (max single lift) ≤ 25 tons (customizable down to 12 tons) ≤ 55,000 lbs
Platform Deck Load (operating) ~180 tons (fully rigged up) ~397,000 lbs
Operating Temperature -20°C to +45°C (-4°F to +113°F) –
Certifications API 4F, 7K, 8C; ISO 9001; ISO 14001; OHSAS 18001 –


Application Fields

The HZJ315DD is a perfect fit for:

  • Mature offshore oilfields – Adding infill wells on platforms originally built for lighter workover rigs.

  • Fixed platforms with limited crane capacity – Old platforms with 25–30 ton cranes can still lift this rig’s modules.

  • Shallow to medium water depth (5–30m) – Typical for fixed jacket platforms.

  • Platform workover & intervention – Extending field life without a dedicated workover vessel.

  • Marginal field development – When a full-size 4,500 kN rig would be overkill.

Real-world example: Three HZJ315DD units are currently operating in the Bohai Bay area, performing both infill drilling (average 3,200m MD) and pump workovers. One operator reported 40% faster rig mobilization compared to their older hydraulic workover units.

Product Type & Series

The HZJ315DD belongs to SJ’s lightweight fixed offshore rig series (HZJ model line). We also offer:

Model Hook Load Typical Use
HZJ225DD 2,250 kN (506,000 lb) Light workover, shallow drilling
HZJ315DD 3,150 kN Medium drilling & heavy workover
HZJ450DD 4,500 kN (1,000,000 lb) Full drilling (heavier, non-lightweight)

The "DD” suffix indicates AC VFD electric drive with digital driller’s controls.

OEM Customization – Built for Your Platform

No two platforms are identical. That’s why we treat every HZJ315DD as a semi-custom build.

Here’s what we can tailor:

  • Module weight & dimensions – Tell us your platform crane’s safe working load, and we’ll split the rig into lifts that fit. From 8 tons up to 25 tons per module.

  • Drive configuration – Standard AC VFD, or for cost-sensitive projects: diesel-mechanical (DD deleted) or diesel-electric.

  • Top drive vs. rotary table – Prefer a conventional rotary table and kelly drive? We can adapt. But trust us – the top drive version cuts connection time by 20%.

  • Control cabin – One-man driller’s cabin with ergonomic chair, touchscreen HMI, and remote diagnostics (4G/5G ready).

  • Corrosion protection upgrade – For H₂S service or tropical waters, we add extra coating layers and stainless steel fittings.

  • Well control integration – BOP handling system, choke manifold, and accumulator unit can be mounted on the substructure.

How to get a custom quote: Send us your platform general arrangement drawing, crane capacity curve, and typical well program. Our engineering team (30+ offshore specialists) will propose a rig layout within 10 working days.

Why Choose SJ Petroleum Machinery?

Reason What It Means for You
Sinopec parentage Backed by a Fortune 500 energy giant – financial stability & field-proven technology.
Lightweight expertise Over 15 years of designing compact offshore rigs for China’s busiest mature fields.
One-stop integrated solution We don’t just sell a rig. We provide drilling package, BOP, top drive, controls, and commissioning.
API & global compliance All major components API-monogrammed. No surprises during third-party inspection.
In-house testing yard Full rig assembly and hook-load test in our 50,000 m² yard before shipping. You’re welcome to witness.
Spare parts & remote support 24/7 helpdesk, with spare parts stocked in our Houston (USA) and Dubai hubs – not just from China.
Value engineering We’ll help you reduce total cost of ownership – lighter weight means cheaper deck reinforcement and crane hires.

Frequently Asked Questions

Q1: What does "HZJ315DD” stand for?

A: HZJ = "Huà Zuān Jī” (Chinese for "drilling rig”), 315 = max hook load in metric tons x10 (31.5 tons → 315 kN? Wait, careful: Actually 3,150 kN = 321 metric tons. But the naming tradition: 315 means ~315 tons? Let’s clarify. In SJ’s naming: HZJ315 = 3,150 kN hook load. DD = Digital Drive (AC VFD). So it’s consistent.

Q2: Can this rig be used on a platform that was originally built for a workover rig only?

A: Yes – that’s our sweet spot. The lightweight design keeps deck load under 200 tons fully rigged up. Most workover-rated platforms can handle that with minor local reinforcement.

Q3: What is the typical delivery lead time?

A: Standard HZJ315DD (with minimal customization) ships in 8–10 months from order. Fully custom (new module layout, special coatings) may take 12 months. We’ve delivered rush orders in 7 months – contact us for current shop loading.

Q4: Do you provide offshore installation supervision?

A: Absolutely. Our field service team includes ex-drilling engineers and crane riggers. They’ll stay on your platform until the first well is spudded.

Q5: How does the HZJ315DD compare to a hydraulic workover unit?

A: Hydraulic units are lighter but slower and weaker. The HZJ315DD gives you rotary drilling capability (full string rotation), higher hook load, and AC drive efficiency. If you only need light tubing work, our HZJ225DD might be better. For real drilling and heavy workover, the 315DD wins.

Q6: Is training included?

A: Yes – we provide full operator and maintenance training at your site or at our Jingzhou training center. Simulator-based driller training is optional.

Q7: What’s the warranty?

A: 18 months from shipment or 12 months from commissioning (whichever comes first). Extended warranty plans available.

Q8: Can you help with platform deck modification design?

A: We can’t do structural engineering for your platform (that’s your responsibility), but we provide detailed interface drawings, weight distribution reports, and foundation load calculations. Many clients use these to hire local marine engineers for permit approval.

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