Dual well rig manufacturers
Technical Specifications – XJ and ZJ Series for Dual Well Operations
ZJ40 Truck‑mounted Drilling Rig – Core Dual Well Configuration
| Parameter | Specification |
|---|---|
| Drilling depth (4-1/2″ DP) | 4,000 m (9,840 ft) |
| Max hook load | 2,250 kN (505,800 lbf) |
| Workover depth | 10,000 m (32,800 ft) |
| Engine configuration | Dual Caterpillar C18 engines, each 630 HP |
| Transmission | Dual Allison M6620AR |
| Carrier drive | Self‑propelled 14×10 |
| Mast height | 24 m (79 ft) |
| Racking board capacity | 4,000 m (4‑1/2″ DP) |
| Traveling system | 6×5 |
| Max travel speed | 45 km/h (28 mph) |
| Air assist brake system | KOBELT disc with matched caliper |
| Total weight | 76,000 kg (1,676,000 lbs) |
XJ650 – Best‑Selling Dual Well Workover Rig
| Parameter | Specification |
|---|---|
| Drilling depth (3-1/2″ DP) | 2,000 m (6,560 ft) |
| Workover depth (2-7/8″ DP) | 7,000 m (23,000 ft) |
| Servicing depth (2-7/8″ EUE tubing) | 8,500 m (27,900 ft) |
| Max static hook load | 1,580 kN (355,200 lbf) |
| Max hook load | 1,575 kN (354,000 lbf) |
| Engine | Caterpillar C18, 470 kW (630 HP) at 2,100 rpm |
| Carrier drive | Self‑propelled 12×8 |
| Racking board capacity | 2,000 m (4-1/2″ DP) |
| Mast clearance height | 35 m (115 ft) |
| Traveling system | 4×5 |
| Max travel speed | 45 km/h (28 mph) |
| Air assist brake system | KOBELT disc with matched caliper |
XJ750 – Heavy Duty Dual Well Configuration
| Parameter | Specification |
|---|---|
| Drilling depth (4-1/2″ DP) | 3,000 m (9,840 ft) |
| Workover depth (2-7/8″ DP) | 8,000 m (26,200 ft) |
| Max hook load | 1,700 kN (382,000 lbf) |
| Engine configuration | Dual Caterpillar C15 engines, each 500 HP |
| Transmission | Dual Allison M5610HR |
| Carrier drive | Self‑propelled 14×8 |
| Mast clearance height | 38 m (125 ft) |
| Racking board capacity | 3,000 m (4-1/2″ DP) |
| Traveling system | 6×5 |
| Max travel speed | 45 km/h (28 mph) |
Applications – Where Our Dual Well Rig Excels
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Artificial island cluster drilling – extremely tight well spacing demands a rig that can walk sideways and rotate 360° in confined deck space.
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Onshore multi‑well pads – shale gas, tight gas and conventional fields with 10–30 wells per pad; walking and skidding systems enable continuous drilling without rig‑down.
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Long‑row cluster development – oilfields where wells are arranged in a single line; rail skidding system moves the rig along the row one well at a time.
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Multi‑row cluster development – wells arranged in a grid pattern (e.g., 5 × 5); hydraulic walking system with 360° rotation moves the rig from any well to any other.
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Offshore platforms – walking systems integrated into platform substructure for workover and well intervention.
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Arctic cluster pads – short drilling windows demand rapid well‑to‑well moves; cold‑climate walking systems operate reliably at -45 °C.
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Desert cluster pads – walking and skidding systems operate on sand with minimal ground preparation; sealed hydraulics resist sand ingress.
Product Types – Dual Well Rig Configurations from SJ Petro
1. Hydraulic Walking Rig (Full‑Directional)
Best for multi‑row cluster wells, artificial islands, and irregular well spacing. Four independent walking units attached to the rig substructure, central hydraulic power unit (HPU), wireless remote control console. Total lifting capacity up to 1,200 t (300 t per unit). 360° rotation capability – move forward, backward, sideways and rotate around a point. Ground‑bearing pressure ≤ 7,500 lbf/ft² – minimal pad preparation required.
2. Rail Skidding Rig (Long‑Row Development)
Best for large land rigs and long‑row cluster development (up to 20 wells in a row). Skidding beams (rails) laid across the pad length. Hydraulic cylinders mounted on the rig substructure push the rig along the rail. Available as single guide rail (straight‑line moves), double guide rail (increased stability), or leapfrog type (alternately lifting and moving support beams). Load capacity up to 1,500 t.
3. Self‑Propelled Truck‑Mounted Dual Well Rig
Best for cluster wells where the rig must move between pads as well as between wellheads on the same pad. XJ series self‑propelled carriers (10×8, 12×8, 14×8, 14×10) with dual Caterpillar engines and Allison transmissions. Max travel speed 45 km/h (28 mph). Hydraulic mast raising – one‑person operation. No lowboy trailer, no crane.
4. 2‑in‑1 Dual Well Workover + Drilling Rig
Best for cluster pads requiring both new well drilling and ongoing well servicing. XJ550, XJ650, XJ1000 and XJ1200 with rotary table and drilling line. Drilling depth up to 2,000 m (3-1/2″ DP). Eliminates the need for a separate drilling spread on the pad.
5. Arctic‑Rated Dual Well Rig
Best for Siberia, Northern Canada, Alaska. Extended operating temperature range to -45 °C. Low‑temperature hydraulic fluids (pour point below -55 °C), engine block heaters, battery warmers, heated air intakes for pneumatic systems, insulated hydraulic lines, heated control cabins. Proven in Russia.
Why Choose SJ Petro for Your Dual Well Rig?
Because a dual well rig is a major capital investment. You need a manufacturer who has proven its equipment in the marine environment and can deliver the certification your project requires.
| Your Challenge | SJ Petro’s Answer |
|---|---|
| "I have 20 wells in a single row. How do I move the rig efficiently?” | Rail skidding system – move along the row one well at a time, up to 1,500 t load capacity. |
| "My wells are in a 5 × 5 grid. I need to move in multiple directions.” | Hydraulic walking system – 360° rotation; walk forward, backward, sideways; move from any well to any other. |
| "I already own a rig. Can I add dual well moving capability without replacing it?” | Retrofit walking system – attaches to existing substructure; we provide installation supervision. |
| *"I operate in -45 °C winters. Will the hydraulics freeze?”* | Arctic package – low‑temp fluids, heated HPU, insulated hoses, cold‑rated seals. Proven in Russia. |
| "My pad has limited space. The rig cannot turn around.” | Walking system with turntable – continuous 360° rotation; turn the rig without additional space. |
| "My tender requires API certification.” | Full API 4F, 7K, 8C compliance. API monogram available. Complete documentation package. |
More reasons to trust SJ Petro:
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Sinopec Group heritage – founded in 1941, over 80 years of oilfield equipment engineering
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In‑house manufacturing – annual production capacity of 100 workover rigs and 100 drilling rigs
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API 4F, 7K, 8C certified – full international certification
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Global track record – dual well rigs delivered to China, Middle East, Russia, Southeast Asia and Africa
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Full documentation – material test reports, structural calculations, load test certificates, as‑built drawings, API data sheets
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Flexible commercial terms – milestone payments (30/40/30), operating leases and direct financing available for qualified buyers
Frequently Asked Questions (FAQ) – Dual Well Rig
Q1: What is a dual well rig?
A: A dual well rig is a highly mobile drilling or workover unit designed for multi‑well pads, artificial islands and cluster well developments. Unlike conventional rigs that require disassembly, crane lifts and transport trucks to move between wellheads, a dual well rig remains fully assembled. Using hydraulic walking systems, rail‑guided skidding or self‑propelled carriers, it moves laterally from one wellhead to the next in hours – not days. SJ Petro manufactures the XJ and ZJ series of dual‑purpose rigs ideally suited for dual well and cluster applications.
Q2: What is the difference between a walking system and a skidding system for a dual well rig?
A: A walking system uses four independent lift‑and‑walk units that allow the rig to move in any direction – forward, backward, sideways – and rotate 360°. It works on unprepared ground and is ideal for multi‑row cluster wells (grid patterns). A skidding system moves the rig along fixed guide rails or beams in a straight line. It is best for long‑row cluster development where wells are arranged in a single line.
Q3: What workover depths can your dual well rigs reach?
A: Our XJ series covers depths from 1,000 m to 9,000 m. ZJ40 reaches up to 4,000 m drilling depth (4-1/2″ DP) and 10,000 m workover depth. XJ650 reaches 7,000 m workover depth (2-7/8″ DP) and 2,000 m drilling depth (3-1/2″ DP). Maximum hook load ranges from 300 kN to 2,250 kN (67,440–505,800 lbs).
Q4: Are your dual well rigs API certified?
A: Yes. Our XJ and ZJ series are designed, manufactured and tested in accordance with API Spec Q1, 4F, 7K, 8C. We are authorised to use API monogram on products under these specifications. For international tenders, we provide complete certification packages including material test reports, hydrostatic certificates, NDT reports, API data sheets and as‑built drawings.
Q5: What is included in the warranty?
A: 12 months after commissioning or 18 months after shipment – whichever occurs first. The warranty covers manufacturing defects on all components (carrier, engine, transmission, drawworks, mast, hydraulic system). Wear parts are not covered but are available as spares. Extended warranty (up to 5 years) is available.
Q6: Do you provide operator training for dual well rigs?
A: Yes. For every rig purchase, we include 1–2 weeks of on‑site training during commissioning, covering rig operation, maintenance, safety protocols, mast raising, walking system operation and emergency procedures. Digital manuals, video tutorials and remote support are also provided.
Q7: What is the lead time for a dual well rig?
A: Standard lead times from order confirmation: XJ250–XJ350 (standard configuration): 4–5 months; XJ450–XJ550: 5–6 months; XJ650–XJ1200: 6–8 months; Custom builds (arctic, desert, walking system): 8–10 months.
