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Snubbing unit

Technical Specifications – BYJ Series Snubbing Units

Below are representative parameters for our standard snubbing unit models. Custom specifications available on request.

Model	Max Lifting (kN)	Max Snubbing (kN)	Max Well Depth (m)	Working Pressure (MPa)	BOP Stack Size	Configuration Options
BYJ-270	270	135	3,500	14	7-1/16" 5K	Truck / Trailer
BYJ-400	400	200	4,500	21	7-1/16" 10K	Truck / Skid
BYJ-600	600	300	5,500	21	7-1/16" 10K	Trailer / Skid
BYJ-900	900	450	6,100	35	9" 10K	Skid / Independent
BYJ-1350	1,350	675	6,500+	35	11" 10K	Skid / Independent
Marine 160T	1,600	800	Offshore rated	35 (5,000 psi)	7-1/16" 10K	Marine skid
2,250 kN Unit	2,250	1,125	6,100 (record)	35-70	API 6A / 16C	Independent skid

Additional specifications available:

Injector head stroke: up to 14 ft (4.2 m)
Pipe handling capacity: 1" to 4-1/2" tubing
Power source: diesel (150–600 HP), grid electric, or dual-fuel
Control system: manual hydraulic or PLC-assisted touchscreen
Climate packages: -40°C arctic to +55°C desert

Application Fields – Where Snubbing Units Deliver Maximum ROI

Snubbing equipment isn't for every well — but where it's needed, nothing else works. Primary applications include:

Live Well Workover & Completion
Change downhole pumps, gas lift valves, or sliding sleeves without killing the well. Protect reservoir pressure and eliminate kill fluid costs. Typical payout: 2–5 interventions per unit per year to cover equipment cost.

Underbalanced Drilling (UBD)
Drill while maintaining underbalanced conditions. Snubbing unit handles pipe trips without killing the well, preserving the underbalanced state that prevents formation damage.

High-Pressure Gas Well Intervention
Conventional workover rigs cannot safely handle wells with surface pressure above 3,000 psi. Snubbing units routinely work at 5,000–10,000 psi with proper BOP stack and pressure control procedures.

Deep & Ultra-Deep Wells (5,000m+)
At extreme depths, snubbing loads become massive. Our BYJ-1350 and 2,250 kN units are specifically engineered for these conditions, with reinforced jacks and high-capacity slip bowls.

Offshore Platform Workover
Space is limited, and well-killing operations are environmentally risky. Skid-mounted snubbing units occupy minimal deck space and allow intervention without shutting down adjacent wells.

Fishing, Milling, Scraping, and Sand Circulation
When tools are lost downhole or scale buildup restricts flow, snubbing units provide the pushing force and rotary torque needed for mechanical cleanup operations — all under pressure.

Plug & Abandonment (P&A)
Regulatory requirements for permanent well abandonment are tightening globally. Snubbing units allow you to set plugs and cut casing in live wells, completing P&A operations faster and with less environmental risk.

ESP (Electric Submersible Pump) Deployment
Retrieve and run ESP cable and pump assemblies without pulling the tubing and killing the well — saving days per operation.

Why Choose SJ Petroleum Machinery as Your Snubbing Unit Manufacturer?

1. Sinopec’s Manufacturing Backbone

We’re not a trading company or an assembler. We’re a direct Sinopec subsidiary with a 663,000 m² factory, over 2,000 employees, and a national‑level enterprise technology center. When you need engineering support, spare parts, or custom modifications, we have the scale to deliver.

2. API & ISO Certified – No Compliance Surprises

Our snubbing units are designed to API 6A, API 16C, API 7K, and API Q1 standards. Complete documentation packages are available for every unit — essential for international tenders and regulatory approvals.

3. Field-Proven in Tough Environments

SJ snubbing units have operated in:

Russia’s arctic region (-45°C ambient)
Middle Eastern desert (55°C + sandstorms)
South American high-altitude fields (4,000m ASL)
Offshore Southeast Asia (corrosive marine atmosphere)
China’s Fuling shale gas field (high pressure, deep laterals)

4. Factory-Direct Pricing

By manufacturing everything in-house — jacks, slips, BOP handling tools, power units, control systems — we control costs and quality. No middlemen markups. Compare our spec-to-price ratio with any European or North American supplier.

5. Custom Engineering Service

Standard units cover 80% of applications. For the remaining 20%, our engineering team will modify stroke length, pressure rating, mounting configuration, control logic, or materials selection to match your exact well conditions.

6. Global Logistics & Field Support

We export worldwide via break‑bulk or container shipping, with full export packing, customs documentation, and optional on-site commissioning. Spare parts stocked in regional warehouses for rapid delivery.

Technical Comparison – Snubbing Unit vs. Conventional Workover Rig

Feature	Snubbing Unit	Conventional Workover Rig
Well kill required?	No	Yes
Formation damage risk	Minimal	High (kill fluids invade)
Operational speed under pressure	Fast (stripping)	Slow (need to kill, then work, then revive)
Maximum working pressure	10,000+ psi	0 psi (after killing)
Typical crew size	4–5 persons	6–8 persons
Footprint at wellsite	Small (fits on most pads)	Large (requires guylines, clear space)
Cost per intervention (high-pressure wells)	Lower	Higher (due to lost production + kill fluid)

FAQ – Snubbing Unit Selection & Operation

Q1: What’s the difference between a snubbing unit and a hydraulic workover unit?

The terms are often used interchangeably, but a technical distinction exists: "Snubbing unit” typically refers to equipment capable of both snubbing (pushing pipe in) and stripping (pulling pipe out under pressure). "Hydraulic workover unit” sometimes refers to lighter-duty assisted units that rely more on well pressure for the snubbing stroke. We manufacture both types — just tell us your operating envelope and we’ll recommend the right configuration.

Q2: What’s the maximum working pressure your snubbing units can handle?

Our standard high-pressure units are rated to 10,000 psi (69 MPa) working pressure with API 6A 10K BOP stacks. For specific projects, we can engineer systems up to 15,000 psi. Please consult our engineers for ultra-high pressure requirements.

Q3: What kind of training do you provide for snubbing unit operators?

We provide comprehensive on-site training (typically 5–7 days) covering: safety and well control procedures, hydraulic system operation, snubbing/stripping techniques, emergency responses, and routine maintenance. Remote refresher training and digital manuals are also available.

Q4: Can you customize a snubbing unit for H₂S (sour service) environments?

Yes. We offer sour service packages with CRA (corrosion-resistant alloy) components, special seal materials (HNBR, AFLAS), and NACE MR0175 compliance. Please specify H₂S concentration when requesting a quote.

Q5: What’s your typical delivery lead time?

Standard units (BYJ-270 to BYJ-600): 90–120 days
Heavy units (BYJ-900 to 2,250 kN): 120–150 days
Custom-engineered units: 150–180 days

Expedited options may be available depending on production schedule — contact our sales team for current lead times.

Q6: Do you provide BOP stacks and control systems as part of the snubbing unit package?

Absolutely. We supply complete pressure control packages — annular BOPs, ram BOPs (blind/shear/pipe), choke manifolds, accumulator units, and remote control panels — all API-certified. This single-source approach ensures compatibility and simplifies procurement.

Q7: What are the most common snubbing unit applications I should consider first?

If you operate high-pressure gas wells, aging fields with low reservoir pressure, or offshore platforms — snubbing should be in your standard intervention toolbox. Many operators start with one shared snubbing unit across multiple fields to build competency before expanding fleet.

Q8: How do I size a snubbing unit for my well conditions?

Key inputs: maximum anticipated wellhead pressure (shut-in), maximum hook load required (pipe weight + friction), maximum snubbing load (if you need to push pipe against pressure), and well depth. Send us your well data — we’ll run calculations and recommend a model with safe margins.

Q9: Do you offer rental or lease options?

Yes. For operators who need snubbing capability for a specific project or trial period, we offer short-term and long-term rental agreements with technical support included. Contact us for rental availability and terms.

Q10: How do I request a snubbing unit quote?

Email our sales team with the following information (as available):