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Oil and Gas - Gulf Marine Services

GMS operates the largest independent self-elevated support vessel (SESV) fleet in the MENA region and is the largest in the world. We charter our SESVs to a high quality client base comprising leading NOCs, oil majors and broader oil and gas services companies operating in the MENA region and northwest Europe, for use as customised work platforms for offshore oil and gas construction and well maintenance services. (We also charter our SESVs for use by leading offshore renewable energy companies to support their construction and maintenance of wind farms.)

Oil and Gas - Gulf Marine ServicesWe aim to conduct our business sustainably without causing harm to people or the environment. The requirements defined in this policy and throughout our Business Management System are mandatory at all levels of the organisation.

Our vessels support our clients in two principal areas that span the lifecycle of shallow water offshore oil and gas fields (and offshore renewable energy projects):

Opex Activities, which we define as brownfield projects, operations, maintenance and modifications, with respect to both oil and gas and offshore renewable energy projects, as well as well servicing retrofit or upgrade activities with respect to oil and gas assets. These activities are typically funded out of our clients’ operating budgets.

Capex Activities, which we define as greenfield projects, engineering, procurement and construction activities, installation and decommissioning with respect to both oil and gas and offshore renewable energy projects and, with respect to enhanced oil recovery activities, water injection and gas injection. These activities are typically funded out of our clients’ capital expenditure budgets.

Our Self-propelled MOU’s offer several unique advantages over traditional jack-up barges and rigs. They can move between platforms quickly and independently without any tug support required. Pre-loading is carried out without the need for ballast which means they can jack-up to an operational airgap much quicker. Heavy lift crane capacity means there is no requirement to bring in additional lifting resources. Our MOU’s can support a broad range of Offshore Oil and Gas Operations, including:

  • Platform Installation and
  • Platform asset life extension
  • Well services and maintenance
  • Flexible accommodation
  • Heavy lift operations


GMS has provided barges to the Oil and Gas Industry since 1977. Our range of services includes providing support for Top side maintenance, Well Intervention, Commissioning and accommodation activities.

GMS CantileverWe aim to conduct our business sustainably without causing harm to people or the environment. The requirements defined in this policy and throughout our Business Management System are mandatory at all levels of the organisation.

Our experience has enabled us to find ways to make our barges increasingly efficient and versatile, enabling them to perform enhanced tasks for our clients, at a lower cost.

Our latest innovation is our new Cantilever system which has been developed with exactly these principles at its heart. GMS’ new cantilever is set to provide clients with a much greater range of options in the way they use our barges to service their offshore assets. Developed in partnership with leading Norwegian designer Dwellop A.S., this innovative system will provide current and prospective clients with new cost-effective solutions for work that has traditionally been performed by more expensive non-propelled drilling rigs.

The new cantilever system enables our barges to replace much higher cost drilling rigs for workover operations by offering greater efficiencies, quicker servicing times and lower costs. Our barges can deploy sooner, do not require tugs and the time spent rigging up, rigging down and lifting backwards and forwards is removed. Therefore, significant periods of non-productive time is eliminated, resulting in substantial cost savings for our clients.

Many of the platforms we service are located in shallow water and are well advanced in their operational lifecycle. This creates asset integrity issues, which traditional servicing methods struggle to resolve. The new cantilever allows GMS to address these issues by enabling heavy loads to be supported over the well head without transferring that load to the well head structure itself. Both the technical and commercial cases for developing the new system were therefore highly compelling.

Dwellop A.S. is a former Rolls Royce Marine company and a reputed designer and supplier of topside handling systems for well intervention. The rig and equipment technology is proven and was developed for the harsh environment of the North Sea under the quality requirements of Rolls-Royce.

Rigless Well Services: Current Operations

GMS barges provides a stable platform for accommodation and support of Well Services operations including Pumping, Wireline, Coil Tubing, Well Test & Clean-up operations.

Cantilever for Well Intervention and Work Over Operations

GMS has developed two Cantilever designs to support intervention

  • Light Well Intervention Cantilever focused on aiding safer and more efficient operations for Pumping, Logging, Coil tubing, Well Test & Clean up operations.
  • E Class Work Over Cantilever with automated hoist and top drive system to support heavier workover scopes requiring handling of drill pipe and completion strings. This complete system is designed to perform operations such as plugging and abandonment, light drilling, change out of submerged pumps and completions.

E-Class Workover Cantilever

Light Well Intervention Cantilever

Regional Drivers

  • Drilling Rig reduction/ OPEX Optimisation Projects
  • Maintaining Existing Oil Production
  • Reservoir Management to Extend Field Life

Regional Production Enhancement Gains From

  • Workover of shut-in wells
  • Failed B Annulus Repairs
  • “Change of use” for wells
  • Secondary recovery – Gas lift/ESP/Velocity String
  • Slot recoveries
  • Sidetracking
  • Stimulation

Assets Life Cycle Management

  • Conductor repairs
  • Platform retirement
  • Plug & Abandonment

Regional Drivers

  • Drilling Rig reduction OPEX Optimisation Projects
  • Lift Boat potential for wider scope
  • Maintaining Oil Production
  • Ageing Assets

Regional Production Enhancement Gains From

  • Water Shut-Off
  • Gas Shut-Off
  • Depleted reservoirs
  • Mechanical integrity repairs
  • Scale remediation
  • Stimulation

Extending Asset Life Through

  • Conductor repairs
  • Annular integrity remediation
  • Corrosion mapping of concentric strings – Thru Tubing


Comparison of GMS SESV with Workover Cantilever vs conventional Jackup Rig – Case Study


E Class Workover Cantilever Operations

Maintenance Services

The GMS fleet of self-propelled jackup barges is capable of working in harsh weather environments, with high operational availability. Our jackups provide the stable platform for delivery of a wide range of services throughout the total lifecycle of offshore oil, gas and renewable energy activities, including:

  • Enhanced oil recovery
  • Drilling support, completions and testing
  • Platform construction, hookup and commissioning
  • Well intervention and workover
  • Platform restoration and maintenance
  • Coil tubing, wireline, snubbing
  • Well abandonment and decommissioning
  • Wind turbine installation and maintenance
  • Diving support activities

Manpower Services

GMS services includes manpower provision for the maintenance services in support of clients planned maintenance activities on their well head towers and offshore installations. Work carried out can include platform structures, piping, vessels, electrical, instrumentation and helideck replacements.

GMS manpowerGMS team services also covers the planning and logistics personnel based onshore together with fabrication and support services offshore, based on GMS vessels. Work performed can include scope definition and scheduling, detailed work preparation including material supply chain, WHT (well-head tower) repairs, NDT (non-destructive testing) and pressure testing. Our multidiscipline team can be tailored to suit client requirements consisting of project engineers, planners, material co-ordinators, quality control inspectors, construction supervisors and foremen, fabricators, welders, fitters, electrical and instrumentation technicians, riggers and carpenters.”