Onshore Pressure Operation Equipment

Technical Specifications – DYJ40-120 Series Onshore Snubbing Unit

Specification	Parameter
Maximum Working Pressure (static seal)	21 MPa (approximately 3,000 psi)
Maximum Lifting Capacity (hook load)	400 kN to 800 kN (40–80 tons)
Maximum Snubbing (down‑push) Capacity	50% of lifting capacity
Configuration Type	Standalone / Rig‑Assist (workover‑assisted)
Applicable Tubing Outer Diameter	1″ to 3‑1/2″ OD
Drive System	Diesel‑hydraulic (grid‑electric optional)
Rotating Capability	Available on request (hydraulic rotary table)
BOP Stack Configuration	Triple‑ram BOP as standard
BOP Control	Remote panel (local backup available)
Transport Configuration	Two‑module integrated design
Number of Truck Loads	2
Rig‑up Time	0.5 days (approximately 4–6 hours)
Rig‑down Time	0.5 days
Mobility	Skid / Trailer / Truck‑mounted configurations available
Operating Temperature	–20°C to +50°C (standard); low‑temperature package available
Environmental Packages	Desert / Low‑temperature (–45°C) on request
Certifications	API Q1, ISO 9001, HSE compliance

Product Types – Which DYJ40-120 Configuration Is Right for You?

The DYJ40-120 series includes multiple models differentiated by lifting capacity and configuration.

Model	Configuration	Max. Lifting Capacity	Max. Snubbing Capacity	Best Application
DYJ40	Standalone / Rig‑Assist	40 tons (400 kN)	20 tons (200 kN)	Light intervention, shallow wells up to 2,000 m
DYJ60	Standalone / Rig‑Assist	60 tons (600 kN)	30 tons (300 kN)	Medium‑depth conventional workover
DYJ80	Standalone / Rig‑Assist	80 tons (800 kN)	40 tons (400 kN)	Deeper wells up to 4,000 m, heavier strings

All models within the DYJ40-120 series share the same 21 MPa working pressure rating and the same two‑module integrated transport design. The choice between models depends on the depth of your wells, the weight of your tubing strings, and the expected snubbing forces.

Applications – Where DYJ40-120 Delivers Maximum Value

The DYJ40-120 series onshore pressure operation equipment is suited for a wide range of live‑well interventions on conventional onshore wells:

Application	Why DYJ40-120 Is the Right Choice
Pull and run tubing in mature fields – Routine tubing replacement, scale removal, or pump changeout	21 MPa pressure rating matches depleted reservoir conditions; 40–80 ton capacity handles standard production strings
Water injection well maintenance – Replace injection tubing, clear scale, inspect packers	Designed for water injection well workover; rapid mobilization between wells on injection pattern
Low‑pressure gas well workover – Retrieve downhole equipment, repair casing leaks	Live‑well operation prevents kill fluid damage to low‑pressure reservoirs that may never restart
Sand cleanout under pressure – Remove sand fill blocking production or injection	Circulation capability while maintaining well control; critical for sand‑prone fields
Fishing under pressure – Retrieve stuck tools or lost equipment without killing the well	Snubbing force to pull against stuck tool; BOP stack maintains well control during fishing
Multi‑well batch workover – Same operation across multiple wells on a pad	0.5‑day rig‑up/rig‑down enables moving between wells in single shift; two‑truck transport minimizes mobilization cost
Workover on wells with limited site access – Remote locations or constrained pad layouts	Modular two‑module design fits where larger equipment cannot reach
Sour gas well intervention – H₂S‑containing wells where personnel exposure must be minimized	NACE trim available; live‑well operation reduces entry frequency compared to kill‑and‑restart

The common thread across all these applications is that they occur on wells where wellhead pressure is already at or below the 21 MPa rating of the equipment – and where the unit's rapid mobilization and low capital cost are the defining advantages.

Why Choose SOFE and SJ Petroleum Machinery?

1. Twenty Years of Snubbing Engineering – Proven Across China's Oilfields

SOFE has been active in snubbing and workover equipment for nearly twenty years, accumulating real‑world engineering knowledge that informs every unit. The company's product lineup covers low‑pressure, medium‑pressure, high‑pressure, deep oil and gas development, anti‑lifting clamping, hydraulic workover, remote control, and automation models.

The DYJ40-120 series is the result of that two decades of experience – refined through field use in conventional oilfields across China.

2. National Manufacturing Single Champion – A Mark of Quality

SOFE's subsidiary Siji Company has been recognized as a National Manufacturing Single Champion Demonstration Enterprise – a distinction from China's Ministry of Industry and Information Technology that reflects manufacturing leadership at the national level. This is not a marketing label – it is an independent recognition of manufacturing quality.

SOFE holds over 421 active patents, including 82 national invention patents, and has led or participated in the formulation of 63 external standards – including 11 national standards and 33 industry standards.

3. Exported to Over 40 Countries – Proven in Global Oilfields

SOFE products have been exported to more than 40 countries and regions including the United States, Russia, the Middle East, South America, Africa, and Southeast Asia. The company has established a network of over 70 sales service stations in major domestic oil and gas regions, with professional marketing service teams supporting international customers.

Recent export achievements include six ZJ90DB deep well drilling rigs successfully deployed for Kuwait National Petroleum Company – all started ahead of schedule by a cumulative 280 days, with over 7,700 cumulative safe operating hours.

4. Complete Product Line from a Single Source – Not Just a Component Supplier

Unlike specialists who focus on only one snubbing configuration, SOFE offers the full spectrum – from low‑pressure DYJ40-120 units for mature fields to 105 MPa high‑pressure units for deep shale gas and 270‑ton lifting capacity units for ultra‑deep wells. When you buy from SOFE, you are buying from a manufacturer that understands the entire snubbing ecosystem – not just one piece of it.

5. API Q1 & ISO 9001 Certified – International Quality Standards

All DYJ40-120 units are manufactured to API Q1 and ISO 9001 quality management standards, with HSE compliance as standard. BOP stacks can be provided with API 6A certification. Additional certifications – including GOST for Russian operations and DNV for offshore applications – are available on request.

6. Full Customization for Your Wellsite

We understand that no two well intervention programs are identical. The DYJ40-120 series can be customized for:

Configuration – Standalone or rig‑assist
Lifting capacity – 40 tons, 60 tons, or 80 tons
Tubing diameter – Slips and BOP rams matched to your specific pipe size
Drive system – Diesel‑hydraulic standard; grid‑electric optional
Rotating capability – Hydraulic rotary table for milling/drilling operations
Environmental package – Desert cooling, low‑temperature (–45°C), or offshore corrosion protection
Control interface – Language options, custom screen layouts

7. Responsive After‑Sales Support

Our support model includes:

On‑site commissioning and acceptance testing
Operator training for snubbing unit operation and safety procedures (typical duration 3–5 days)
Spare parts availability – from seals and slips to hydraulic components
Remote troubleshooting via phone and email
Preventive maintenance schedules and recommended parts replacement intervals

Frequently Asked Questions (FAQ)

Q1: What is the difference between "onshore pressure operation equipment” and a standard workover rig?

A conventional workover rig requires the well to be "killed” – filled with heavy fluid to suppress well pressure – before any work can be performed. Onshore pressure operation equipment (snubbing) is specifically designed for live‑well workover. The well remains under its natural pressure while the snubbing unit runs or pulls pipe through a BOP stack. The advantage is that you do not lose production during the intervention, you avoid the cost of kill fluid and its disposal, and you eliminate the risk of formation damage from kill fluid invasion.

Q2: What wellhead pressure range is the DYJ40-120 series designed for?

The DYJ40-120 series is rated for 21 MPa maximum working pressure (approximately 3,000 psi). This covers the vast majority of mature conventional oil and gas wells, water injection wells, and low‑pressure gas storage fields. For higher pressure wells, SOFE offers the DYJ70-160 and DYJ160-270 series rated up to 105 MPa.

Q3: What is the maximum lifting capacity of the DYJ40-120 series?

The series includes models rated at 40 tons (400 kN), 60 tons (600 kN), and 80 tons (800 kN). Snubbing (down‑push) capacity is approximately 50% of the lifting capacity for each model.

Q4: Can the unit be transported by standard road vehicles?

Yes. The DYJ40-120 is designed as an integrated two‑module system that ships on just two truck loads. Both modules are sized to meet standard road transport regulations for width, height, and axle loading in most jurisdictions.

Q5: How long does it take to rig up the unit on location?

From arrival of the two trucks, the unit can be rigged up and ready for operation in approximately half a day (0.5 days). Rig‑down takes the same time.

Q6: What tubing sizes can the unit handle?

The DYJ40-120 series is compatible with tubing outer diameters from 1″ up to 3‑1/2″ . Slips and BOP rams can be configured to match your specific tubing size. Larger diameters (up to 9‑5/8″) are handled by other SOFE product lines.

Q7: Can the unit perform rotating operations like milling?

Yes. The DYJ40-120 can be equipped with an optional hydraulic rotary table and high‑pressure circulating swivel, providing the ability to mill out plugs or drill under pressure. Contact our technical sales team to discuss rotating capabilities for your specific operation.

Q8: Is the unit suitable for offshore use?

The DYJ40-120 series is primarily designed for onshore operations. For offshore platforms, SOFE offers a separate DYJ150 offshore snubbing unit designed with marine corrosion protection, modular configuration for platform crane lifting, and fast‑disconnect systems for emergency well abandonment.

Q9: What is the warranty on the equipment?

Standard warranty is 12 months from commissioning, covering manufacturing defects in materials and workmanship. Extended warranty packages are available.

Q10: Can existing snubbing units be upgraded to the DYJ40-120 configuration?

For operators who purchased earlier SOFE snubbing units, retrofit to current specifications is possible in most cases. Contact our technical sales team with your serial number for an assessment.

Q11: What certifications are available for export?

The DYJ40-120 series meets API Q1, ISO 9001, and HSE standards. Additional certifications – including GOST for Russian operations, EAC for the Eurasian Customs Union, and DNV for offshore – are available on request.

Q12: Do you offer leasing or rental options?

Yes. Flexible short‑term rental and long‑term leasing arrangements are available through our international finance partners. This is particularly popular for operators testing snubbing for the first time or for short‑term project work.

Q13: What is the typical lead time for a DYJ40-120 unit?

Standard configurations typically ship within 90 days of order confirmation. Custom configurations – with special lifting capacities, environmental packages, or rotating capability – may require 90–120 days.

Q14: How many operators are required to run the unit?

Standard operation requires a crew of 4–5 personnel: one operator at the control console, one working the work platform, and two supporting pipe handling and site operations. For remote control and fully automated configurations (available as upgrades), crew size can be reduced to 2–3 operators.

Q15: What is the power source for the unit?

Standard DYJ40-120 units are diesel‑hydraulic – a diesel engine drives the hydraulic power unit that supplies all powered functions. For operators with grid power available at the wellsite, a grid‑electric drive configuration is available on request. The electric drive offers lower operating costs, lower noise, and zero tailpipe emissions compared to diesel‑hydraulic.