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Compact modular rigs

Technical Specifications

Here are the key technical parameters for our compact modular rig families. All specifications are customizable for your specific depth requirements, environmental conditions, and transport logistics.

Parameter	XJ Series (Compact Workover/Drilling)	Big Easy Series (Crane‑Free)	ZJ Modular (Land Drilling)
Max Static Load	300–2,250 kN (30–225 tons)	1,350–2,700 kN	1,350–5,850 kN
Workover Depth (2-7/8″ DP)	3,500–9,000 m	N/A	N/A
Drilling Depth (4‑1/2″ DP)	1,000–1,500 m (with drilling config)	2,500–5,000 m	1,500–9,000 m
Installed Power	235–1,300 HP	600–1,200 HP	550–3,000+ HP
Module Count	3–6	3–5 (trailer‑integrated)	4–12
Max Module Weight	≤15 tons (road)	≤25 tons (trailer)	≤20 tons (road) / ≤10 tons (heli)
Module Width (max)	2.5 m	Trailer‑mounted (≤2.55 m)	2.5 m
Transport Mode	Self‑propelled truck chassis / flatbed	Self‑propelled trailer	Flatbed / helicopter
Rig‑up Time	1–3 days	2–3 days	3–7 days
Rig‑down Time	1–2 days	1–2 days	2–5 days
Crane Required?	Sometimes (partial)	No	Yes (unless heli)
Power Source	Diesel / AC electric	AC VFD (diesel generator)	Diesel / AC electric / Dual‑fuel
Drive Type	Mechanical / Hydraulic / Electric	AC VFD	Mechanical / AC‑VFD
Top Drive Compatible	Optional (drilling config)	Optional	Yes (ZJ50 and above)
Skidding Option	Yes (light)	No	Yes (full hydraulic)
Environmental Range	–30°C to +55°C	–20°C to +50°C	–45°C to +55°C (cold‑weather spec)
API Compliance	API Q1, 4F, 7K, 8C	API Q1, 4F, 7K, 8C	API Q1, 4F, 7K, 8C

Product Types

Our compact modular rig offerings cover three main families, each suited to different applications and mobility requirements.

Series	Type	Key Features	Best For
XJ Self-Propelled Workover Rigs	Compact truck‑mounted	Max static load 300–2,250 kN; installed power 235–1,300 HP; workover depth up to 9,000m	Workover, well intervention, light drilling (up to 1,500m)
Big Easy Series (BE550/BE770)	Trailer‑mounted AC VFD	Crane‑free self‑erection; 2–3 day rig‑up; 2,500–5,000m drilling depth	Fast‑cycle drilling, remote locations with no crane access
ZJ Skid-Mounted Modular	Skid‑based modular	1,500–9,000m depth; 550–3,000 HP; helicopter‑liftable modules available	Standard land drilling, multi‑well pads, arctic/desert environments

Specific XJ model reference: Our self-propelled workover rigs include XJ150, XJ250, XJ350, XJ450, XJ550, XJ650, XJ1000 and XJ1200 — covering the full range from 235 HP to 1,300 HP installed power.

Application Fields

Compact modular rigs aren’t for every job. But for the jobs they’re designed for, nothing else comes close. Here’s where they truly shine.

1. Remote & Roadless Locations (Jungle, Mountain, Arctic Tundra)

If there’s no road to the wellsite — or the road is too narrow, too steep, or too fragile — conventional rigs can’t get there. Compact modular rigs with helicopter-liftable modules (≤10 tons each) can be flown in piece by piece.

Real-world relevance: Helicopter-transportable drilling rigs exist on the market. The LF70, for example, is a flyable rig with a depth capacity of 700 m that can be assembled in less than an hour, with each of its seven components weighing less than 585 kg. Our systems scale this concept to oilfield depths — with modules designed for Mi-26 or Chinook lift capacity.

How SJ Petro helps: We can design modules to meet specific helicopter weight limits for your operation. We’ve delivered helicopter-transportable configurations for jungle operations in Southeast Asia and arctic tundra in Russia.

2. Urban & Environmentally Sensitive Drilling

Drilling in a city, near residential areas, or adjacent to protected land comes with strict footprint limits and noise restrictions. A conventional rig would overwhelm the site.

How SJ Petro helps: Our compact rigs take up 30–50% less surface area than conventional rigs of equivalent capacity. The Big Easy series, with its crane-free assembly, generates less on-site disruption. And all rigs can be equipped with noise-reduction enclosures and dust-control systems.

3. Offshore Platform Workovers & Interventions

Offshore platforms have extremely limited deck space. Bringing in a full-size jack-up rig for a simple workover or well intervention can be overkill — and expensive. Modular HWO (hydraulic workover) systems are increasingly used for this purpose, as they can execute heavy workover operations in space‑constrained offshore environments without shutting in production.

How SJ Petro helps: Our offshore-capable compact modular rigs are designed specifically for platform deck constraints. All offshore components are marine-grade with corrosion-resistant coatings. And we offer marine classification certification (ABS, DNV, CCS) upon request.

4. Mature Field Development & Workover Programs

In mature fields like the North Sea or older onshore basins, most development drilling is already done — but you still need regular workovers, well interventions, and occasional infill drilling. Maintaining a full-size rig on standby for occasional use destroys your economics.

How SJ Petro helps: The XJ series workover rigs are self-propelled (truck chassis) and can be mobilized quickly when needed. They convert between workover and light drilling configurations in the field. And because they’re compact, they don’t require the same site preparation (access roads, large laydown areas) as a conventional rig.

5. Fast‑Cycle Exploration Drilling

When you’re drilling 5, 10, or 20 exploration wells across a wide area in two years, you can’t afford a 4-week rig move between each well. The math simply doesn’t work.

How SJ Petro helps: Our Big Easy series rigs up in 2–3 days and rigs down in 1–2 days — no crane required. Over a multi-well exploration program, that’s weeks or months of saved time.

6. Multi‑Well Pad Development (Shale, Tight Gas, CBM)

Once you’re on the pad, you need to move between well slots efficiently. But first, you need to get the rig onto the pad. If the pad is small or access roads are narrow, a compact modular rig may be the only option that fits.

How SJ Petro helps: Our compact modular rigs have smaller transport dimensions than conventional rigs, making them easier to deliver to tight pads. Once on location, the rig can be equipped with hydraulic skidding to move between slots without disassembly.

Why Choose SJ PETROLEUM MACHINERY for Compact Modular Rigs?

Here’s the straightforward case.

1. Over 80 years of continuous drilling equipment manufacturing. We started building drilling rigs in 1941, before many of our competitors existed. Our product lines now cover 12 families and more than 200 types across drilling & workover equipment, production equipment, offshore drilling & production equipment, and high-pressure manifolds.

2. Backed by Sinopec — but independently focused. As a wholly-owned subsidiary of Sinopec Oilfield Equipment Corporation, our rigs are validated in Sinopec’s own oilfields (Shengli, Jiangsu, Tarim) before they ever reach export markets. You’re not our beta tester.

3. Proven modular technology with real-world track record. New products we’ve developed and delivered include modular rigs, Big Easy rigs, and snub rigs. We’ve built a 7000m modularized drilling rig for Saudi Arabia (high-temperature, sandy environment) and cold-weather modular rigs for Russian arctic operations.

4. True"Lego-block” modular architecture. Many competitors claim"modular” but deliver oversized components that still require specialized transport. Our modules are designed for standard road-legal dimensions — 2.5 meters wide, ≤20 tons — with helicopter-liftable options available.

5. Fast‑move, fast‑install technology. Rig‑up time of 3–7 days (ZJ modular) down to 2–3 days (Big Easy). Conventional rigs often require 2–4 weeks. That’s time — and money — back in your pocket.

6. API certified for international standards. Our drilling rigs are designed and manufactured in accordance with API Spec Q1, 4F, 7K, 8C and RP500, meeting the requirements for international procurement tenders. For offshore, we offer ABS, DNV, or CCS marine certification upon request.

7. Full IP ownership — no third-party licensing. Our modular designs are fully自主研发 (independent R&D) with complete intellectual property rights. No licensing fees. No technology transfer restrictions. No foreign vendor lock-in.

8. Global track record — 3,000+ international transactions. We’ve exported to over 30 countries across North America, Russia, Central Asia, the Middle East, Southeast Asia, and Africa. We understand export logistics, customs documentation, and cross-border technical support.

9. Cost‑effective without compromising quality. Our rigs are typically 30–50% less expensive than comparable Western brands. Not because we compromise on quality — because we control our own manufacturing, maintain lean operations, and pass the savings to you.

10. Full life‑cycle support. We’ve established a high-quality supply chain to ensure full-life service — spare parts availability, remote diagnostics, field service engineers, and comprehensive training for your crews.

Frequently Asked Questions (FAQ)

Q1: What exactly makes a rig "compact” versus just "modular”?

"Modular” means the rig breaks down into transportable pieces. "Compact” means those pieces — and the assembled rig — have a smaller physical footprint than conventional rigs of equivalent capacity. Our compact modular rigs typically take up 30–50% less surface area and have narrower transport dimensions (2.5m width vs. 3.5m+ for conventional). That difference matters when you’re working on a tight pad or navigating narrow roads.

Q2: How much does a compact modular rig cost compared to a conventional rig?

The premium for compact modular design is typically 10–20% higher than a conventional rig of equivalent capacity, due to the engineering required for module design and interface standardization. However, that premium is often recovered in 2–3 rig moves — because mobilization costs are dramatically lower. We can provide a project-specific ROI analysis based on your expected move count and distances.

Q3: Can I transport your compact modular rig by helicopter?

Yes — but with limits. Our standard ZJ modular modules can be specified for helicopter lift (≤10 tons per module). We’ve done this for jungle operations in Southeast Asia and arctic tundra in Russia. For most oilfield applications, however, truck transport is more cost-effective. Contact our engineering team with your specific access constraints for a custom weight analysis.

Q4: What is the rig‑up time for your compact modular rigs?

XJ series (self-propelled workover): 1–3 days
Big Easy series (crane‑free): 2–3 days
ZJ modular (standard): 3–7 days

In comparison, a conventional rig of similar capacity typically requires 2–4 weeks for rig‑up. The time savings compound across multiple wells.

Q5: Can your compact modular rigs be used for both drilling and workover?

Yes — specifically our XJ series. The XJ450 Drilling & Workover Rig has a workover depth up to 4,500m and can function as a mobile drilling rig up to 1,500m depth when equipped with rotary table, swivel, and drilling tools. This dual-purpose capability is particularly valuable for mature field operations.

Q6: Do your rigs meet API standards?

Yes. Our drilling rigs are designed and manufactured in accordance with API Spec Q1, 4F, 7K, and 8C — the key API standards for drilling and hoisting equipment. We also maintain ISO 9001 and HSE certifications. For offshore applications, we can supply ABS, DNV, or CCS marine certification upon request.

Q7: What’s the operating temperature range for your compact modular rigs?

Standard: –20°C to +55°C
Cold-weather (arctic) spec: –45°C continuous operation; –60°C storage
Desert spec: enhanced cooling for +55°C ambient with dust/sealing protection

We have delivered arctic-spec compact modular rigs to Russian operators and desert-spec rigs to Saudi Arabia.

Q8: Can I add skidding capability for multi‑well pad moves?

Yes. Our ZJ modular rigs can be equipped with hydraulic skidding systems that allow the entire assembled rig to move between well slots without disassembly. Skidding stroke: up to 12 meters per cycle. Positioning accuracy: ±5 mm. Remote control from driller’s cabin.

Q9: What’s your typical lead time for a compact modular rig?