Intervention Workover Control Systems (IWOCS)

As your trusted IWOCS service partner for over 25 years, we help customers simplify operations, and deliver projects on-time and on-budget. Our systems are designed for both rig- and vessel-based operations, and are adaptable to provide the utmost operational flexibility.


An Experienced Global IWOCS Specialist

  • Tree installation
  • Completion
  • Workover
  • Intervention
  • Plug and abandonment (P&A)

Multiple Deployment Options

With four standard deployment options available, there is more flexibility in configuring your ideal IWOCS solution, than with any other service company. The ideal deployment method depends on project specifics, rig configuration, and your philosophy.

This method is the most simple and space saving in the moonpool area, but is only able to be deployed / retrieved with the marine riser.

1 Clamped to riser

Features and Benefits

  • Not as affected by currents
  • Small footprint
  • Field-proven

The system can be deployed and retrieved independently from the marine riser.

2 Dual Guide Wires

Features and Benefits

  • Not as affected by currents
  • For older rigs, this may be the best IWOCS option
  • Dual Guidewire is a time-proven reliable method

This method improves deployment time, reduces equipment, and offers flexible placement on the rig or vessel.

Lars Open Water C

Features and Benefits

  • Used on either a rig or vessel
  • Fast deployment - No guidewires and guide funnels needed
  • Flexible placement of equipment SIMOPS
  • Reduced amount of equipment

A proprietary high-pressure IWOCS solution utilizing industry-leading self-supporting umbilical technology.

4 Lars Self Supporting (edited)

Features and Benefits

  • Reduces footprint on rig/vessel by 50%
  • Reduces crew size by 33%
  • Combats VIV (Vortex Induced Vibration)
  • Eliminates crews suspended above water
  • Multi-use for installation of trees, manifolds, and jumpers
  • Used on either a rig or vessel
  • Away from moonpool area - flexible placement of equipment

How Does it Work?

An IWOCS is a temporary control system used to commission, workover, troubleshoot, or decommission subsea wells. Specialized equipment such as umbilical reels, hydraulic power units (HPUs), and winches are used to enable hydraulic and electrical control of subsea trees and related hardware.

Reliable and Cost-Effective Operations

Our systems can be used to control all subsea trees and/or landing strings, regardless of equipment manufacturer, configuration, or work scope. Adaptable equipment and experienced personnel significantly reduce your interface risk. Our IWOCS fleet can be mobilized and operated from a wide range of vessels and rigs.

IWOCS jobs performed
Available Technicians
dedicated technicians available worldwide
x 365 support
Working pressure up to 15,000 psi

IWOCS Service Models

Choose the model that fits your needs


  • Onshore and offshore operations
  • SIT and EFAT services
  • Interface engineering


  • Commercial options tailored to client requirements

Customers Owned

  • Storage, maintenance and operation
  • Onshore and offshore
  • SIT and EFAT services
  • Interface engineering

Learn more about our Workover solutions

Contact Us | Intervention Workover Control Systems (IWOCS)

Company page Since our founding in the early 1960s, Oceaneering has expanded and grown globally to service several industries such as the offshore energy industry, defense, entertainment, material handling, aerospace, science, and renewable energy industries. In 1964, Mike Hughes and Johnny Johnson formed a Gulf of Mexico diving company called World Wide Divers. The company grew in response to increasing demand for their services and in 1969 merged with two other diving companies to form Oceaneering International, Inc. To solve the toughest challenges, we do things differently, creatively, and smarter. As your trusted partner, our unmatched experience and truly innovative portfolio of technologies and solutions give us the flexibility to adapt and evolve, regardless of market conditions. Our mission is to solve the unsolvable. We thrive by creating industry-changing technically creative solutions for the most complex operational challenges under water, on land, and in space. Our five core values establish a common culture and demonstrate what is most important for us as a company. Since the beginning, the company has transformed from a small regional diving company into a global provider of engineered products and services. Today, we develop products and services for use throughout the lifecycle of an offshore oilfield, from drilling to decommissioning. We operate the world's premier fleet of work class ROVs. Additionally, we are a leader in offshore oilfield maintenance services, umbilicals, subsea hardware, and tooling. We also serve the aerospace, defense, and theme park industries. Underpinning everything we do, safety is not only the foundation of our core values, but it is vital to our unmatched performance record and company culture. The industries we serve are as diverse as they are complex. Whether we are engineering deepwater umbilicals or developing robotics for aerospace applications, the safety and health of our employees, vendors, and customers is an integral part of our day-to-day business. If we are working, then our responsibility is to be working safely. Since our inception in 1964, we have placed a high value on employee safety—from diving services and subsea inspection to vessel-based installation operations. We have and will continue to evolve not only our health, safety, and environmental (HSE) processes, but those of the industries in which we work. Although we have been fatality-free since 1999, our HSE journey goes beyond statistics. As our portfolio of services has grown, we have continued to prioritize and advance our approach to HSE.