Subsea ///

Subsea technology: Achieving a 99% repurpose and recycle rate during decommissioning

Stuart Nelson

Over the past decade, a subsea provider has been growing its decommissioning capabilities across the North Sea. In a project for Repsol Sinopec Resources, it achieved a 99% repurpose/recycle rate.

Technologies to enable subsea electrification for a topside free environment

Matt Lamb

All-electric systems are vital for the future of subsea operations in the energy transition.

Reducing conservatism and increasing service life of subsea BOPs with novel strain sensor

Harald Holden, Vegard Martinsen, Åge Grønningsæter

A company has developed a novel sensor technology to overcome direct measurement of load using strain gauges that allows for accurate measurement of strains in a wide measuring range, as part of a subsea wellhead integrity monitoring system.

Increasing subsea production with DRA

John Gillespie, Art J. Schroeder, Jr., Graeme Kinnell

Subsea injection of drag reducing agents (DRA) into flowlines reduces friction and substantially increases production. For years, DRA has been widely used onshore, and in upstream transfer and export systems. Today, breakthrough advancements allow DRA to be injected into subsea production systems.

Manifold destiny: A new blueprint for a changing world

Mohammed Hasan Ali

There has never been a more challenging time for the energy industry. In the subsea sector, the search for optimised costs, minimised carbon emissions, and maximised performance is set to intensify, as oil prices continue their unpredictable trajectory.

Lessons from the Gulf of Mexico: Expediting an offshore platform’s decommissioning

Vivek K. Prajapati

With the backlog of idle offshore platforms steadily increasing, the industry needs to optimize procedures and operational strategies to reduce costs while improving overall HSE during and after decommissioning.

Flow assurance criticalities and challenges management in Zohr gas field

Mohamed Salah Elsayed, Samir Zayed, Mohamed Ahmed Tolba, Muhammad Karam Omar, Mohamed Nagy Negm, Hatem Mohamed Darwish, Ola Amr Hussein

As multi-phase transport of oil and gas is increasingly stretched over greater distances, and access to subsea infrastructure becomes even more limited, ensuring sustainable, reliable and robust operations is vital to reducing the influence on downstream facilities.

Who pays: Allocating liability for plugging and abandonment costs in the GOM’s OCS

Kaylan Dunn, Michael Morfey

Lessees and interest-holders in the Gulf of Mexico should carefully evaluate the existing contractual language governing their investments in light of case law and consider adding bond requirements or additional consideration in exchange for a specific, express release of costs associated with decommissioning obligations.

Subsurface trend analysis in the Gulf of Mexico

Jared Ciferno, Kelly Rose, Mackenzie Mark-Moser

The Subsurface Trend Analysis (STA) method is a data-driven approach, in which deductive geologic methods are integrated with spatiotemporal statistical autocorrelative methods. NETL has developed STA to better understand subsurface systems and predict their properties.

Making in-situ flowmeter calibration a reality

Dr. Bruno Pinguet

A combination of laboratory and wellsite analysis can be used to address in-situ meter performance to reduce maintenance frequency. This conditioned-based monitoring can reduce the overall annual cost of operating multiphase flowmeters in deeper and more remote fields.

Developing pre-rig solutions that are greener, safer and more efficient

Jostein Aleksandersen

There is an increased focus in the oil and gas sector to look further afield to opportunities presented in deepwater locations. Because of this, finding cost-efficient solutions and overcoming the associated challenges that arise below 1,000 ft will be vital for the success of new activity.

Regional Report: Gulf of Mexico

Mike Slaton

Trifecta hammers U.S. operations

Driving toward safer, environmentally conscious offshore operations: Moving chemical storage to the seabed

Julie Lund

Subsea systems offer flexible offshore storage of oil and condensate. NOV has developed the technology further into a safe, eco-friendly option for the subsea storage and injection of chemicals.

Shared values and integrated technologies optimize well abandonment operations

Glenn (GT) Iversen

A synergistic approach to finishing responsibly goes beyond traditional barrier placement for P&A and helps the operator to achieve the best possible environmental and financial results.

Unique snubbing unit cleans out long section of decommissioned pipeline in one trip

Bobby Bray, Charles C. Overstreet

Using an innovative snubbing/hydraulic workover unit, in conjunction with a semisubmersible well intervention vessel, enabled an operator to clean out 5½ miles of decommissioned deepwater GOM pipeline in an environmentally safe and cost-effective manner.

Novel flexible pipe overcomes challenges in pre-salt subsea developments

Andre Macedo, Mauricio Brandao

An innovative technological solution has overcome flexible pipe corrosion cracking in high CO2 content fields, including Brazil’s pre-salt offshore developments. The new pipe system is verified to extend service life by at least 50%, compared to standard flexibles.

Cut to the chase: Reducing offshore wellhead removal costs

Jarle Hvidsten, Ole Petter Nipen

A vessel-deployed mechanical cutting device reduces the cost of offshore wellhead removal.

Preventing gas hydrate plugging in deepwater wells

Jonathan Wylde, Scot Bodnar, Claudia Mazzeo, Zachary Ward

Low-dosage hydrate inhibitors are an alternative technology to thermodynamic inhibitors for preventing gas hydrates from restricting production from deepwater wells. Injecting the correct amount of a high-performance chemical has proven effective at mitigating unplanned shut-ins and the resulting loss of production revenue.

Technology scaled for any response

David Nickerson

In the developing world of offshore drilling in the U.S. Gulf of Mexico, leaders in well control containment technology must be innovative to keep pace with drillers in the region.

Bluefield Geoservices expands footprint in the U.S. with new contract wins

Bluefield Geoservices, an international subsea geotechnical services provider, recently announced its third survey project offshore the U.S. this season, the latest being an export cable route site investigation off the Northeast U.S. for a major offshore wind project.

Inmarsat and Fameline MoU extends strategic collaboration

A Memorandum of Understanding (MoU) has been signed between Fameline Holding Group (FHG), its subsidiaries and Inmarsat – a global, mobile satellite communications company - extending an existing strategic collaboration.