Snubbing Units

Technical Specifications – Representative Snubbing Units

Parameter	SJ‑SU‑150K	SJ‑SU‑225K	SJ‑SU‑340K	SJ‑SU‑460K
Max Lifting Capacity	670 kN (150,000 lb)	1,000 kN (225,000 lb)	1,500 kN (340,000 lb)	2,050 kN (460,000 lb)
Max Snubbing Capacity	300 kN (66,000 lb)	530 kN (120,000 lb)	930 kN (210,000 lb)	930 kN (210,000 lb)
Stroke Length	3.0 m (10 ft)	3.5 m (11.5 ft)	4.0 m (13 ft)	4.5 m (15 ft)
Tubing Size Range	1.9–4.5" OD	1.9–5.5" OD	2.375–7" OD	2.875–9.625" OD
Rotary Torque	5,000 ft-lb	11,000 ft-lb	17,000 ft-lb	22,000 ft-lb
Pressure Rating	70 MPa (10,000 psi)	105 MPa (15,000 psi)	140 MPa (20,000 psi)	140 MPa (20,000 psi)
Power Unit	Diesel, 250 HP	Diesel/Electric, 350 HP	Diesel/Electric, 500 HP	Diesel/Electric, 650 HP
Configuration	Trailer / Skid	Trailer / Skid / Offshore module	Skid / Offshore module	Skid / Offshore module
Certification	API, ISO 9001, HSE	API, ISO 9001, HSE	API, ISO 9001, HSE	API, ISO 9001, HSE

Applications – Where SJ Snubbing Units Deliver Results

Application	Well Type	Typical Operation	Why Snubbing
Live well completions	Oil & gas producers	Running production tubing, setting packers	No kill fluid = no formation damage
Workover under pressure	Mature fields	Rod/tubing changes, pump replacements	Keep wells producing during work
Fishing operations	Stuck pipe/ tooling	Retrieving broken BHA, fish	Can snub/rotate simultaneously
Plug milling	Bridge plugs, frac plugs	Mill plugs under pressure	Rotary capability in live well
Sidetracking	Horizontal / deviated wells	Kick off milling, short radius drilling	Can rotate through friction
Well deepening	Depleted reservoirs	Drill below existing TD	Live well operation prevents loss
Plug & abandonment	End-of-life wells	Set cement plugs, pull tubulars	Eliminate kill fluid costs
Casing repair	Leaking casing	Patch installation, section milling	Work in live conditions
Blowout recovery	Emergency well control	Live well intervention	Emergency well control applications

Field Proven – Real Results

Case: Shallow Well Snubbing – Jilin Oilfield
Field application of snubbing units across 89 wells achieved 100% success rate. The snubbing units effectively controlled wellhead pressure, prevented blowouts, and enabled safe production while delivering remarkable economic and environmental benefits. Average operation period: 15 days with highest pressure 5.6 MPa. Formation damage eliminated.

Case: Offshore Application – South China Sea
SJ’s modular offshore snubbing unit design facilitates installation and disassembly on platforms where space is at a premium. The anti-deflection device and integrated cooling system support long-duration milling and plug-drilling operations.

BYJ900 Self-Propelled Snubbing Rig

For land-based cluster well applications, SJ’s BYJ900 is a self-contained, long-stroke, self-propelled snubbing rig. Key specifications:

• Workover depth: 4,000 m (2-7/8″ tubing)

• Max lifting: 900 kN, Max snubbing: 650 kN

• Stroke: 10.5 m (34 ft) – one joint per stroke!

• Engine power: 450 HP, 8×8 drive chassis

• PLC real-time monitoring and warning

• No assistance needed from other equipment

Product Types – Complete Snubbing Unit Range

Type 1: Rig-Assist Snubbing Units

Mounted on or working alongside a conventional workover rig. The rig provides hoisting; the snubbing unit provides snubbing force. Best for:

• Conversions from conventional workover

• Operations where a full stand-alone unit isn’t justified

• Lower capital cost entry to snubbing

Type 2: Stand-Alone Hydraulic Snubbing Units

Complete self-contained units with integrated HPU, hydraulic jacks, and workbasket. No rig required. Best for:

• Remote well locations

• Operations requiring maximum independence

• Offshore platform installations

Type 3: Quick-Rig / Trailered Snubbing Units

Mounted on trailers for fast mobilization between land wells. Configurable with:

• 150K to 340K capacity

• Rapid rig-up (hours, not days)

• Minimal footprint for small well sites

Type 4: Offshore Modular Snubbing Units

Purpose-designed for fixed platforms:

• Module weight within platform crane capacity

• Quick-disassembly structure

• Anticorrosion marine coating

• Compact layout for limited deck space

Type 5: BYJ Series Self-Propelled Snubbing Rigs

All-in-one snubbing and workover vehicle:

• Self-propelled 8×8 or 10×10 chassis

• Integral snubbing jacks and rotary table

• PLC monitoring with real-time warning

• One-joint-per-stroke efficiency

OEM Customized Solutions – Built for Your Wells

Snubbing operations vary widely – by well pressure, tubing size, depth, and location. SJ offers extensive customization:

Your Requirement	Our Solution
High-pressure well (140 MPa+)	460K-600K rating, NACE MR0175 components, pressure-boosted HPU
Offshore platform with crane limit	Offshore-modular split design – individual module weight under 15 tons
Sour gas (H₂S)	NACE-compatible seals and hydraulics, stainless steel components
Deep well >5,000m	Extended-stroke jacks (5m+), high-capacity mud pumps, larger tubing handling
Space‑constrained deck	Compact workbasket design, right‑angle control console, reduced footprint
Cold climate operation	Low‑temp hydraulic fluid, heated workbasket, cold‑rated seals
Remote location, no power	Diesel-powered HPU with integrated fuel system
Automated operation	PLC controls with position feedback, data logging, remote monitoring

Custom engineering process:

Step 1 – Well data: Send us maximum wellhead pressure, tubing program, depth, location type (offshore/land).

Step 2 – Capacity selection: We calculate required snubbing and lifting capacity.

Step 3 – Configuration design: HPU type, jack configuration, control system layout.

Step 4 – Module split (offshore): Define module sizes to fit platform crane.

Step 5 – Fabrication & test: 4-7 months depending on complexity.

Step 6 – Commissioning: Our field engineers support rig-up and first job.

Why Choose SJ Petroleum Machinery for Snubbing Units?

Reason	What You Actually Gain
Sinopec Group subsidiary	Core equipment manufacturer of China Petrochemical Corporation. Founded 1941, 2,000+ employees, 663,000 m² facility.
Complete product portfolio	12 families and more than 200 types of products. Snubbing units, modular rigs, fracturing pumps, well control equipment – all in-house.
API & ISO certified	API 4F, 6A, 7K, 8C, 16C; ISO 9001; HSE certified – all critical components API-monogrammed.
Comprehensive snubbing line	150K to 600K capacities, rig-assist to offshore-modular to self-propelled rigs.
More than 200 national patents	Proven R&D capability with advanced manufacturing processes.
In-house manufacturing	2,100+ precision machines covering casting, forging, machining, assembly. We build complete units, not assemblies.
Field application success	100% success rate across multiple field deployments.
Global spares & support	Spares stocked regionally. 24/7 technical support from snubbing specialists.

Frequently Asked Questions (FAQ)

Q1: What is the difference between a snubbing unit and a hydraulic workover unit (HWO)?

A: The terms are often used interchangeably. Technically, "snubbing” refers specifically to pushing pipe into the well against wellbore pressure (pipe‑light condition). "Hydraulic workover” is the broader term covering both snubbing and conventional pulling. SJ snubbing units are full HWO units – they do both.

Q2: What well pressures can your snubbing units handle?

A: Up to 140 MPa (20,000 psi) working pressure, with additional safety margin. Our standard units match industry benchmarks. For extreme HPHT applications, we can engineer higher ratings.

Q3: Can an SJ snubbing unit be installed on an offshore platform with a small crane?

A: Yes – SJ offshore modular snubbing units are designed for platform crane lift limits. Each module weight is controlled within the crane’s safe working load range, enabling simple installation and disassembly in tight offshore environments.

Q4: What size tubing can your units handle?

A: Range from 3/4" OD up to 13-5/8" OD depending on the unit. Our 460K model handles up to 9-5/8" casing and 7" tubing.

Q5: Do you provide hydraulically powered rotary tables?

A: Yes – standard on all stand-alone units. Rotary torque up to 22,000 ft‑lb for milling and drilling operations.

Q6: What is the typical lead time for a snubbing unit?

A: Standard skid units: 4–6 months. Offshore modular units: 6–8 months. Custom heavy units: 7–9 months.

Q7: Do you offer on-site commissioning and training?

A: Yes – SJ field engineers supervise rig‑up, conduct function testing, and provide operator training. Standard: 2 weeks on-site.

Q8: What safety certifications do you hold?

A: API Q1, ISO 9001, ISO 14001, OHSAS 18001, and third-party inspection by DNV, ABS, Lloyd's or CCS as required.

Q9: Can you supply a snubbing unit as part of a complete workover package?

A: Yes – SJ provides integrated packages: snubbing unit, BOP stack, choke manifold, mud pump, HPU, and control cabin. One supplier, single warranty.

Tag: