Petroleum drilling rig series
Technical Specifications – Full ZJ Series Comparison
| Model | Depth (m) | Hook Load (kN) | Drawworks HP | Drive Options | Mast Height (ft) | Substruct. Height (m) | Approx. Weight (t) |
|---|---|---|---|---|---|---|---|
| ZJ30 | 3,000 | 1,700 | 600‑1,000 | Mech / SCR / VFD | 110‑118 | 4.0‑5.5 | 120‑160 |
| ZJ40 | 4,000 | 2,250 | 1,000‑1,500 | Mech / SCR / VFD | 120‑130 | 5.5‑7.0 | 180‑240 |
| ZJ50 | 5,000 | 3,150 | 1,500‑2,000 | SCR / VFD | 130‑140 | 6.0‑8.0 | 250‑320 |
| ZJ70 | 7,000 | 4,500 | 2,000‑2,500 | VFD | 140‑150 | 7.0‑9.0 | 350‑450 |
| ZJ90 | 9,000 | 6,750 | 3,000‑4,000 | VFD | 150‑160 | 8.0‑10.5 | 500‑650 |
| ZJ120 | 12,000 | 9,000 | 4,000‑6,000 | VFD | 160‑170+ | 9.0‑12.0 | 700‑900 |
Common specifications across the series:
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Top drive compatibility: all models accept 250‑900 t AC top drives
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Mud pumps: 2‑3 x 800‑2,200 HP triplex/quintuplex
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BOP rating: 5,000‑15,000 psi (model dependent)
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Certifications: API 4F, 7K, 8C, Q1; ISO 9001, 14001, 45001
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Warranty: 18 months from shipment or 12 months from commissioning
Application Fields by Rig Model
| Application | Recommended Models | Typical Depth | Why This Choice |
|---|---|---|---|
| Workover / well repair | ZJ30, ZJ40 | 1,500‑3,000 m | Fast mobilization, small footprint, cost‑effective |
| Conventional oil development | ZJ40, ZJ50 | 2,500‑4,500 m | Best balance of capacity and operating cost |
| Deep gas / HPHT | ZJ50, ZJ70 | 4,500‑6,500 m | High hook load, high‑pressure mud systems |
| Shale gas pad drilling | ZJ50, ZJ70 (walking) | 3,500‑5,500 m | Hydraulic walking, automated pipe handling |
| Ultra‑deep gas / frontier | ZJ90, ZJ120 | 7,000‑11,000 m | Extreme hook load, 6,000 HP drawworks |
| Offshore platform | ZJ50‑OS, ZJ70‑OS | 3,000‑7,000 m | Compact footprint, marine coatings, ABS/DNV |
| Arctic / permafrost | ZJ40‑AR, ZJ50‑AR, ZJ70‑AR | 2,500‑6,000 m | Low‑temp steel, heated enclosures, GOST cert |
| Desert / Middle East | ZJ50‑DT, ZJ70‑DT | 3,000‑6,000 m | Sand‑sealed, oversized cooling, 55°C operation |
Why Choose SJ Petro's Complete Drilling Rig Series?
1. One Supplier for All Your Depth Requirements
From shallow workover to ultra‑deep frontiers, SJ Petro delivers the entire range. No need to qualify multiple vendors, maintain multiple spare parts inventories, or train crews on different control systems. One engineering team, one warranty policy, one service number.
2. Backed by Sinopec – The World's Largest Energy & Chemicals Company
SJ Petro is a wholly‑owned subsidiary of Sinopec Oilfield Equipment Corporation, part of the Fortune Global 500 Sinopec Group. Sinopec operates thousands of wells annually across every climate zone, providing real‑world field data that drives continuous improvement of our rig designs. When you buy a ZJ series rig, you are buying technology refined through billions of drilling feet.
3. API Certified – No Compromises
Every rig in the ZJ series is designed and manufactured to API standards. Full documentation for regulatory approval is provided. Third‑party inspection (ABS, DNV, BV, SGS) is welcome at any stage.
4. Global Service Network
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24/7 remote diagnostics – engineers can log into the control system (with your permission) from anywhere.
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Regional parts hubs – Dubai (Middle East), Houston (Americas), Singapore (Asia‑Pacific) stock common components across the ZJ series.
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On‑site commissioning & training – included with every rig.
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Field service – available for emergency repairs and major overhauls.
5. Flexible Commercial Models
| Option | Description | Best For |
|---|---|---|
| Outright purchase | Standard 30/40/30 payment terms | Operators with dedicated long‑term programs |
| Operating lease | 12‑60 months, maintenance included | Contractors, multi‑year campaigns |
| Short‑term rental | 3‑12 months | Single wells, exploration campaigns |
| Fleet financing | Custom packages for 5+ rigs | Large‑scale development projects |
6. Legacy Support – We Still Support Rig Models from 20 Years Ago
SJ Petro maintains engineering records and spare parts for ZJ series rigs manufactured decades ago. When you invest in our rig series, you are not buying disposable equipment – you are buying a long‑term asset backed by a manufacturer committed to lifecycle support.
FAQ – Petroleum Drilling Rig Series
Q1: What is the difference between ZJ30 and ZJ40 – and how do I choose?
A: The ZJ30 is rated for 3,000 m depth and 1,700 kN hook load, suitable for shallow development, workover and coalbed methane. The ZJ40 is rated for 4,000 m and 2,250 kN hook load, suitable for most conventional oil and gas development wells. Choose ZJ30 for workover or shallow fields; choose ZJ40 for standard development drilling. If you anticipate drilling deeper than 3,500 m, the ZJ40 provides better reserve capacity.
Q2: Are the ZJ50 and ZJ70 rigs available with walking systems for pad drilling?
A: Yes. Both ZJ50 and ZJ70 can be equipped with hydraulic walking systems that move the entire assembled rig between wellheads on a cluster pad. Inter‑well move time is 24‑48 hours. The walking system is factory‑installed or field‑retrofittable.
Q3: What is the difference between mechanical, SCR and AC VFD drives – and which should I choose?
A: Mechanical drive (clutch/gearbox) – lowest upfront cost, suitable for shallow wells with simple requirements. SCR (DC) drive – smoother than mechanical, moderate cost, good for medium depths. AC VFD – infinitely variable speed, regenerative braking, best automation integration, highest efficiency. For ZJ50 and above, AC VFD is standard and recommended. For ZJ30/ZJ40, mechanical or SCR may be cost‑effective for simple applications.
Q4: Can I upgrade a ZJ50 to ZJ70 capacity later?
A: Within limits. The ZJ50 and ZJ70 share the same mast and substructure families, but the ZJ70 mast is rated for higher hook load. Upgrading from ZJ50 to ZJ70 typically requires replacing the drawworks module (1,500 HP → 2,000+ HP), adding mud pump capacity, and upgrading the top drive. The substructure may be reused. Contact our engineering team for a specific upgrade assessment.
Q5: How does the ZJ120 compare to other ultra‑deep rigs on the market?
A: The ZJ120 offers 9,000 kN hook load (900 metric tons) and 6,000 HP drawworks, placing it among the most powerful land drilling rigs globally. It is certified to API 4F, 7K and 8C, and has been proven on China's first 10,910 m ultra‑deep well. Price is typically 20‑30% lower than comparable Western‑brand ultra‑deep rigs.
Q6: What is the typical lead time for a ZJ series drilling rig?
A: | Model | Standard Lead Time | Expedited (premium) |
|:---|:---|:---|
| ZJ30 / ZJ40 | 4‑5 months | 3 months |
| ZJ50 | 5‑6 months | 4 months |
| ZJ70 | 6‑7 months | 5 months |
| ZJ90 | 7‑9 months | 6 months |
| ZJ120 | 10‑12 months | 8‑9 months |
Lead times vary based on configuration, options and current production load. Contact us for current availability.
Q7: Do you provide training for crews switching between different ZJ models?
A: Yes. Because the control system and HMI are standardized across the series, transition training is typically 1 week for experienced drillers moving from, say, a ZJ50 to a ZJ70. For new crews, we provide 3‑4 weeks of comprehensive training covering rig assembly, operation, maintenance and safety.
Q8: Can I get a single quote for a complete fleet of ZJ rigs (e.g., 3 x ZJ50 + 2 x ZJ70 + spares package)?
A: Absolutely. We provide fleet pricing and consolidated proposals for multi‑rig orders. Volume discounts apply (typically 5‑12% depending on quantity). We also offer financing packages for fleet acquisitions.
