Well Control & Pressure-Control Equipment
Browse well-control and pressure-control equipment for drilling, workover and well-intervention operations. Review current listings by equipment type and condition, or submit an RFQ for a specific requirement.
Browse available well-control equipment
Explore the equipment currently listed on WELLENGI, or select an equipment type to narrow the results.
Annular and ram BOPs, BOP stacks, drilling spools and related equipment.
Choke and kill manifolds, drilling chokes, control units, valves and high-pressure lines.
Accumulator units, remote panels, bottles and hydraulic-control components.
Diverter annulars, vent lines, valves and operating controls.
Casing and tubing heads, hangers, sealing systems, valves and tree assemblies.
Test pumps, manifolds, plugs, recorders and pressure-verification equipment.
Lubricators, stuffing boxes, grease heads, tool traps and intervention BOPs.
Dedicated BOP cranes, handling frames, transport skids and lifting systems.
Gauges, transducers, monitoring panels and dedicated instrumentation.
Identifiable parts for BOP, choke-and-kill and control systems.
Well-control equipment that doesn't fall under a specific category above.
Well-control equipment works as a system
Well-control equipment provides the pressure barriers, controlled flow paths and operating functions required to shut in, circulate and manage an influx during drilling and other well operations.
A BOP stack cannot be evaluated by bore size and working pressure alone. Its suitability also depends on the well design, tubular programme, expected surface pressure, well fluids, required shearing capability, connection interfaces, control-system capacity and choke and kill arrangement.
| Factor | What must be considered |
|---|---|
| Pressure and temperature | Expected surface pressure, test pressure and operating temperature |
| Tubular programme | Pipe sizes, tool joints, casing dimensions and hang-off loads |
| Ram functions | Sealing range, shearing capability and post-shear sealing |
| Connections | Bore, flange or hub type, pressure rating and stack compatibility |
| Control system | Required functions, usable accumulator volume and response |
| Service environment | Well fluids, sour service, offshore conditions and regulatory requirements |
Different barriers perform different functions
Annular preventers
Annular preventers seal around a range of tubular sizes and shapes within their qualified operating limits. Selection depends on bore, pressure, packing-element type, temperature, fluid compatibility and stripping requirements.
Pipe and variable-bore rams
Fixed-bore pipe rams seal around a specified tubular size. Variable-bore rams cover a defined diameter range, but should not be assumed to seal around every tubular passing through the stack.
Blind and blind-shear rams
Blind rams seal an unobstructed bore. Blind-shear rams are designed to shear specified tubulars and subsequently provide a pressure seal.
Casing-shear and specialized rams
Some applications require dedicated casing-shear, hang-off, stripping, test or intervention ram assemblies. Their functions and operating limits must be confirmed from the manufacturer's documentation.
No single BOP stack suits every well
Surface systems
- —annular and ram BOPs
- —drilling spools
- —choke and kill outlets
- —connectors and transition spools
- —surface hydraulic-control equipment
Subsea systems
- —lower BOP stack
- —lower marine riser package
- —subsea connectors and accumulators
- —control pods
- —emergency-disconnect functions
- —ROV intervention interfaces
The stack arrangement should be defined against the well-control philosophy, tubular programme, required shearing and sealing functions, rig envelope and applicable operator requirements.
Control, circulation and diversion
Choke & Kill Equipment
Provides controlled flow paths into and out of the well during circulation and pressure-control operations. Pressure rating, bore, configuration, materials, erosion exposure, end connections and flexible-line service level should be confirmed for the complete system.
BOP Control Units
Store and deliver the hydraulic energy required to operate the BOP stack and associated valves. Suitability depends on usable accumulator volume, pump capacity, redundancy, operating pressure, control functions and response requirements — not bottle count alone. Also searched as a Koomey unit.
Diverter Systems
Direct shallow formation flow away from the rig rather than shutting in and containing full well pressure. Vent-line arrangement, valve sequencing, control logic and rig layout are integral to the system.
Rotating Control Devices
Provide a dynamic seal around the drill string for managed-pressure, underbalanced and other closed-loop operations. An RCD complements the well-control system and should not automatically be presented as a substitute for conventional BOP functions.
Select the wellhead around the well design
The wellhead supports and suspends casing and tubing strings, seals the annuli and provides pressure-containing interfaces throughout well construction and production. Selection begins with the casing and completion design — not with an isolated flange size or working-pressure rating.
Casing programme and loads
Confirm casing sizes, weights, connections, suspended loads, pressure loads and external mechanical loads.
Pressure and temperature
Confirm the required rating for each stage of well construction and production. The capacity of the complete assembly is limited by its components and interfaces, not only the main housing.
Materials and service environment
Evaluate expected fluids, hydrogen sulphide, carbon dioxide, chlorides, temperature and other corrosive or embrittling conditions.
Configuration and installation
Define whether the system is conventional spool, compact or unitized, threaded, slip-on, weld-on or mandrel-hanger based, together with the required installation tooling and access.
Interface compatibility
Verify compatibility among the BOP, casing hangers, tubing head, tubing hanger, Christmas tree, sealing systems and any required adapters.
Relevant API standards
| Standard | Principal relevance |
|---|---|
| API Specification 16A | Ram and annular BOPs, drilling spools, adapters and connectors |
| API Specification 16C | Choke and kill equipment |
| API Specification 16D | BOP and diverter control systems |
| API Standard 53 | BOP equipment systems used in drilling wells |
| API Specification 6A | Wellhead and Christmas tree equipment |
| API Standard 16AR | Repair and remanufacture of drill-through equipment |
Additional applicable standards
- API Specification 16B — Intervention well-control equipment
- API Specification 16RCD — Rotating control devices
- API Standard 64 — Diverter equipment systems
- API Standard 6AR — Repair and remanufacture of wellhead and tree equipment
- API Specification 17D — Subsea wellhead and tree equipment
- API Specification 16F — Marine drilling-riser equipment and associated interfaces
Evaluating used, surplus or refurbished equipment
Available equipment can reduce procurement lead time, but its configuration, condition and documentation must be assessed against the intended service.
Equipment identity
- —manufacturer and model
- —serial number and legible nameplate
- —original manufacturing date
- —complete equipment configuration
Technical documentation
- —original data book and drawings
- —certificates and material records
- —pressure- and function-test records
- —maintenance and inspection history
- —repair or remanufacture documentation
Current condition
- —elastomer age and storage conditions
- —preservation status
- —known defects
- —recent photographs
- —readiness for physical inspection
Looking for specific well-control equipment?
Submit the required equipment type, configuration, ratings, documentation and delivery schedule. WELLENGI can also approach relevant equipment owners and suppliers when the required item is not currently listed.
What to include
- intended operation
- surface or subsea application
- nominal bore size
- working pressure and temperature range
- expected well fluids
- sour-service requirements
- applicable API or other standards
- required BOP stack configuration
- pipe and ram sizes
- required shear capability
- connection sizes and types
- control-system requirements
- certification and documentation requirements
- acceptable equipment condition
- inspection or recertification requirements
- operating country and location
- required delivery date
Need help evaluating the equipment?
Request independent support with specification review, equipment comparison, documentation assessment or inspection-scope development.
Final equipment acceptance remains subject to the applicable engineering assurance, inspection, testing and operator-approval process.
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