Offshore oil drilling pressure equipment

Technical Specifications

The table below covers our most common offshore pressure equipment configurations. Custom bore sizes, pressure ratings, and material grades are available – just specify your well program.

Annular BOP

Ram BOP (Double – Standard Configuration)

Subsea BOP Control System (MUX)

Applications

Offshore oil drilling pressure equipment from SJ is deployed across virtually every offshore drilling scenario:

1. Jack‑Up Drilling Rigs (Surface BOPs)

For shallow‑water jack‑ups (water depth up to 450 ft), our surface BOP stacks sit directly above the wellhead on the platform deck. The stack typically includes an annular BOP, double ram BOP, single ram BOP, diverter, and choke/kill manifold. Our compact design fits within the limited deck space while still providing full well control.

2. Semi‑Submersible & Drillship (Subsea BOPs)

Deepwater operations require the BOP stack on the seafloor, connected to the rig via a riser. Our subsea BOP systems (up to 15,000 ft water depth) include multiplex control pods, hydraulic accumulators, and fail‑safe valves. The subsea stack is designed for remote operation and ROV intervention.

3. Fixed Platform Development Drilling

For permanent platforms, we supply wellhead assemblies, casing hangers, tubing heads, and surface BOP stacks that integrate with your existing production facilities. NACE compliance is mandatory for sour reservoirs.

4. HP/HT Exploration Wells

High pressure (15,000+ psi) and high temperature (350°F+) wells demand special materials and design. Our HP/HT BOPs and wellheads use Alloy 718, Inconel 625, and super‑duplex stainless steel for sealing surfaces, with extended fatigue life testing.

5. Well Intervention & Workover

During snubbing or coiled tubing operations, our compact BOP stacks (often single or double ram) provide pressure control while keeping the rig‑up height low – critical for platform workover where overhead clearance is limited.

6. Subsea Production Systems

Beyond drilling, our wellhead equipment is used for subsea production trees (Xmas trees), with hydraulic or electric actuators for remote open/close. We supply both vertical and horizontal trees up to 15,000 psi.

7. Offshore CO₂ & H₂S Injection Wells

Carbon capture and storage (CCS) and acid gas injection wells require pressure equipment rated for highly corrosive services. Our clad and solid corrosion‑resistant alloy components meet the strictest NACE requirements.

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Product Types & Models

We offer a complete portfolio of offshore pressure equipment, from individual components to fully integrated systems:

Custom / OEM Services:

• Build to your drawing numbers and specifications

• Your branding and labelling

• Integration with third‑party BOP stacks (Cameron, NOV, etc.)

• Special alloy and clad overlays for extreme sour service

Why Choose SJ Petroleum Machinery?

You could buy offshore pressure equipment from a dozen different suppliers. Here’s why drilling contractors and NOCs choose SJ:

1. Sinopec‑Owned – No Middleman Markup

SJ is a direct, wholly owned manufacturing arm of Sinopec – not a trading company. You pay factory‑direct prices, and you get the engineering resources, quality control, and supply chain of a global energy major.

2. 80+ Years of Pressure Control Experience

We started making wellhead equipment in the 1940s. Eight decades of field feedback means our designs have been tested and refined on thousands of wells – onshore, offshore, HP/HT, sour, you name it.

3. Full API & Classification Certifications

API 6A, 16A, 16C, 16D, 17D – we hold them all. Plus NACE MR0175, ISO 9001, and optional ABS/DNV/CCS classification. Your offshore project won’t be held up by missing paperwork.

4. Proven Offshore Track Record

Our BOP stacks and wellheads are currently operating on jack‑ups in the Persian Gulf, semi‑submersibles in the South China Sea, and fixed platforms off West Africa. We know offshore logistics – containerized packaging, lifting points, corrosion protection – and we build it in.

5. Shorter Lead Times Than Western Competitors

Typical lead time for a surface BOP stack: 12–16 weeks. Subsea BOP stack: 8–12 months. That’s often 30–40% faster than major Western brands. Expedited options available for critical path projects.

6. Full Traceability & Testing

Every pressure‑containing component is serialized with:

• Mill certificates (heat number traceable to raw material)

• NDT reports (UT, MT, PT, RT as applicable)

• Hydrostatic pressure test certificate (1.5× working pressure)

• Function test video (upon request)

7. Global Spares & Field Service

We maintain regional spare parts inventory for all common BOP rams, seals, and control components in Houston, Dubai, Singapore, and Aberdeen. Remote technical support is 24/7. Field service technicians can be on site within 7–10 days for commissioning or repairs.

8. Custom Engineering – No "One Size Fits All”

Tell us your water depth, pressure rating, tubular sizes, and control philosophy. Our engineers will design a system that fits your specific rig and well program – not an off‑the‑shelf compromise.

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Frequently Asked Questions (FAQ)

Q1: What’s the difference between surface BOP and subsea BOP for offshore drilling?

Surface BOP sits above the waterline on a jack‑up or fixed platform. It’s easier to maintain and inspect, but only works for water depths where the rig can stand on the seafloor (jack‑ups). Subsea BOP sits on the seafloor for floating rigs (semi‑submersibles, drillships). It’s connected to the rig via a riser and control umbilical. Subsea BOPs require more complex remote controls and are much harder to service (needs ROV). For water depths > 500 ft, you must use subsea BOP.

Q2: What’s the typical BOP stack configuration for a jack‑up operating in the Persian Gulf?

A typical jack‑up BOP stack (API 16A) includes: Diverter (to route flow overboard), Annular BOP (for sealing around any tubular), Double Ram BOP (two sets of rams – e.g., pipe rams + blind/shear), Single Ram BOP (backup), Choke manifold, Kill manifold, and Accumulator unit (for hydraulic power). Working pressure usually 5,000–10,000 psi depending on reservoir.

Q3: Can your BOP rams cut through high‑strength drill pipe (S‑135)?

Yes. Our shear rams are tested to API 16A Appendix F. The SJ‑RBOP‑13‑5/8″ shear rams will cut through S‑135 5‑1/2″ drill pipe within 60 seconds at rated hydraulic pressure. For larger pipe (6‑5/8″), we recommend our 18‑3/4″ shear rams. Ask for our shear test certificate library.

Q4: Do you offer BOP stack refurbishment and recertification?

Absolutely. We have a dedicated aftermarket service center in Jingzhou (and soon in Houston) that can disassemble, inspect, repair, and recertify any brand of BOP stack – not just SJ. We provide full API 16A recertification with new seals, rams, and pressure testing. Typical turnaround: 8–12 weeks for a full stack.

Q5: What certifications do you include with a subsea BOP control system?

Our subsea MUX control systems come with API 17F and API 16D certification, plus full FAT (Factory Acceptance Test) documentation. We can also provide ABS or DNV product design assessment (PDA) upon request. The system includes SIL ratings for safety functions per IEC 61508.

Q6: How long do you guarantee the equipment for?

Standard warranty: 18 months from shipment or 12 months from commissioning, whichever comes first. Extended warranties (up to 36 months) are available for fleet purchases. We also offer service agreements for preventive maintenance and 24/7 remote monitoring.

Q7: Can you integrate your BOP stack with my existing NOV or Cameron control system?

Yes. Our BOP rams and annular BOPs use standard bolt patterns and hydraulic porting, making them interchangeable with other API 16A stacks. For the control system, we can supply interface panels that speak Modbus TCP, Profibus, or CANopen to your existing PLC. We’ve done this for several operators replacing only the BOP stack while keeping the existing control cabin.

Q8: What’s your typical lead time for a complete subsea BOP stack (15,000 psi, 18‑3/4″ bore)?

Approximately 10–14 months from order to delivery (including engineering, forging, machining, assembly, and testing). Surface BOP stacks for jack‑ups: 3–5 months. We can accelerate by 10–20% with expediting fees if you have a rig waiting.

Q9: Do you offer rental equipment for emergency or short‑term projects?

Yes. We maintain a rental fleet of surface BOP stacks (7‑1/16″ to 13‑5/8″, 5,000–10,000 psi) and accumulator units. Rental terms from 1 month to 12 months, with option to purchase. Contact us for current inventory availability.

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