Products

Home / Products / Dual well drilling solutions

Product Categories

Dual well drilling solutions

Technical Specifications – Dual Well Drilling Rigs

XJ Series – Complete Depth and Load Coverage

Model	Workover Depth (2-7/8″ DP)	Drilling Depth (3-1/2″ DP)	Max Static Hook Load	Drawworks HP	Engine / Power	Carrier Drive
XJ250	3,200 m (10,500 ft)	—	735 kN (165,000 lbf)	250 HP	Cat C9 / 350 HP	10×8
XJ350	3,200 m (10,500 ft)	2,500 m (8,200 ft)	900 kN (202,330 lbf)	350 HP	360 HP class	10×8
XJ450	4,500 m (14,760 ft)	3,500 m (11,480 ft)	1,125 kN (252,900 lbf)	450 HP	Cat C13 / 440 HP	10×8
XJ550	5,800 m (19,000 ft)	4,500 m (14,760 ft)	1,350 kN (303,000 lbf)	550 HP	Cat C15 / 475 HP	10×8
XJ650	7,000 m (23,000 ft)	5,500 m (18,000 ft)	1,580 kN (355,200 lbf)	650 HP	Cat C18 / 630 HP	12×8
XJ750	8,000 m (26,200 ft)	6,500 m (21,330 ft)	1,700 kN (382,000 lbf)	750 HP	Dual Cat C15 / 440 HP each	14×8
XJ1200	9,000 m (29,500 ft)	7,500 m (24,600 ft)	2,250 kN (505,800 lbf)	1,000 HP	1,000+ HP (dual engine)	14×10

XJ650 – Detailed 2‑in‑1 Dual Well Specifications

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)
Workover depth (3-1/2″ DP)	5,500 m (18,000 ft)
Workover depth (4-1/2″ DP)	4,200 m (13,800 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
Mast clearance height	35 m (115 ft)
Racking board capacity	2,000 m of 4-1/2″ DP
Traveling system	4×5
Max travel speed	45 km/h (28 mph)
Carrier drive	Self‑propelled 12×8
Total weight	55,000 kg (121,250 lb)
Air assist brake system	KOBELT Disc with matched caliper

Based on SJ Petro XJ650 product specifications.

ZJ40 – Heavy‑Duty Truck‑Mounted Dual Well Rig

Parameter	Specification
Drilling depth (4-1/2″ DP)	4,000 m (9,840 ft)
Workover depth	10,000 m (32,800 ft)
Max hook load	2,250 kN (505,800 lbf)
Engine configuration	Dual Caterpillar C18 engines, each 630 HP
Transmission	Dual Allison M6620AR
Carrier drive	Self‑propelled 14×10
Mast clearance height	24 m (79 ft)
Racking board capacity	4,000 m of 4-1/2″ DP
Traveling system	6×5
Max travel speed	45 km/h (28 mph)
Total weight	76,000 kg (1,676,000 lbs)
Air assist brake system	KOBELT Disc

Applications – Where Our Dual Well Drilling Solutions Excel

Multi‑well pad development – shale gas, tight gas and conventional fields with 10–30 wells per pad. Hydraulic walking systems enable continuous drilling without rig‑down.
Artificial island cluster drilling – extremely tight well spacing demands a rig that can walk sideways and rotate 360° in confined deck space.
SIMOPS environments – deploy workover rig while a drilling rig continues infill drilling on the same pad, with wells spaced at 5 m. Project‑specific SIMOPS documents ensure safe simultaneous drilling, workover and production operations.
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.
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.
Offshore platforms – walking systems integrated into platform substructure for workover and well intervention.
Arctic cluster pads – short drilling windows demand rapid well‑to‑well moves; cold‑climate walking systems operate reliably at -45 °C.
Desert cluster pads – walking and skidding systems operate on sand with minimal ground preparation; sealed hydraulics resist sand ingress.

Product Types – Dual Well Drilling Solutions from SJ Petro

1. Hydraulic Walking Rig (Full‑Directional)

Best for: Multi‑row cluster wells, artificial islands, 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. Walking speed up to 14 m/h (46 ft/h). 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.

XJ450, XJ550, XJ650, XJ750, XJ1000 and XJ1200 with rotary table and drilling line. XJ650 drilling depth reaches 2,000 m (3-1/2″ DP). Eliminates the need for a separate drilling spread on the pad. Also available in hybrid (oil‑electric dual‑drive) and full electric drive configurations for reduced emissions and lower operating costs.

5. Arctic‑Rated Dual Well Rig

Best for: Siberia, Northern Canada, Alaska.

Extended operating temperature range to -45 °C. Includes 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. Three ZJ40 arctic rigs delivered to Russia’s Orenburg Drilling Company.

Why Choose SJ Petro for Dual Well Drilling Solutions?

Because dual well drilling is a major capital investment. You need a manufacturer who has proven its equipment in multi‑well pad environments 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:

Sinopec Group heritage – founded in 1941, over 80 years of oilfield equipment engineering
Top‑ranked Chinese manufacturer – ranks 2nd on the list of China Top 10 Petroleum Drilling and Production Equipment Manufacturers, rated AAA by China Petrochemical Industry and Banks
In‑house manufacturing – annual production capacity: 100 workover rigs, 100 drilling rigs, 120 cementing units, 80 fracturing units
50,000 m² assembly yard – 24 rig‑up positions, simultaneous commissioning of 12 drilling or workover rigs
API 4F, 7K, 8C certified – full international certification, not "designed to” claims
Global track record – dual well drilling solutions delivered to South America, Western Africa, Middle East, United States, Indonesia, Russia and beyond
Full documentation – material test reports (EN 10204 3.1), structural calculations, load test certificates, as‑built drawings, API data sheets
Flexible commercial terms – milestone payments (30/40/30), operating leases and direct financing available for qualified buyers
Electric drive options – SJ Petro has developed oil‑electric dual‑drive across the SXJ150–SXJ750 range and full electric drive across the SXJ150–XJ850 range for lower emissions and reduced fuel costs

Frequently Asked Questions (FAQ) – Dual Well Drilling Solutions

Q1: What is a dual well drilling solution?

A: A dual well drilling solution is an integrated approach to multi‑well pad development where a single self‑propelled rig moves laterally between wellheads without disassembly, using hydraulic walking or rail skidding systems. The rig can also be designed for 2‑in‑1 capability, serving both as a drilling rig for new wells and a workover rig for existing producers on the same pad – maximising equipment utilisation and minimising the number of rigs required for field development.

Q2: What is the difference between a hydraulic walking system and a skidding system for dual well drilling?

A: A walking system uses four or eight 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 depths can your dual well drilling rigs reach?

A: Our XJ series covers depths from 1,000 m to 9,000 m:

Model	Workover Depth (2-7/8″ DP)	Drilling Depth (3-1/2″ DP)
XJ250	3,200 m (10,500 ft)	—
XJ350	3,200 m (10,500 ft)	2,500 m (8,200 ft)
XJ450	4,500 m (14,760 ft)	3,500 m (11,480 ft)
XJ550	5,800 m (19,000 ft)	4,500 m (14,760 ft)
XJ650	7,000 m (23,000 ft)	5,500 m (18,000 ft)
XJ750	8,000 m (26,200 ft)	6,500 m (21,330 ft)
XJ1200	9,000 m (29,500 ft)	7,500 m (24,600 ft)

ZJ40 reaches 4,000 m drilling depth (4-1/2″ DP) and 10,000 m workover depth.

Q4: Are your dual well drilling rigs API certified?

A: Yes. Our XJ and ZJ series are designed, manufactured and tested in accordance with API Spec Q1, 4F, 7K, 8C and relevant standards. We are authorised to use API monogram on products under these specifications.

Q5: What engine and transmission combinations do you use?

A: XJ250 uses Caterpillar C9 with Allison 4700 OFS. XJ650 uses Caterpillar C18. XJ750 uses dual Caterpillar C15 engines with Allison M5610HR transmissions. ZJ40 uses dual Caterpillar C18 engines with Allison M6620AR transmissions.

Q6: What is the warranty on a dual well drilling rig?

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). Extended warranty (up to 5 years) is available for an additional fee.

Q7: Do you offer electric or hybrid drive dual well rigs?

A: Yes. SJ Petro has developed oil‑electric dual‑drive across the SXJ150–SXJ750 range and full electric drive across the SXJ150–XJ850 range. Features include electric drive chassis, energy storage type grid‑powered rigs, and automated rigs integrating pipe handling equipment to achieve derrick manning reduction and wellsite crew consolidation.

Q8: Do you provide operator training for dual well drilling 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, SIMOPS procedures and emergency protocols. Digital manuals, video tutorials and remote support are also provided.

Q9: What is the lead time for a dual well drilling rig?

A: Standard lead times from order confirmation: