M&W Annulus Pressure Relief System.

Annulus Pressure Relief System installed on oil rig

Overpressure Protection for Oil & Gas Well Stimulation and Intervention since 1995

An advanced – yet simple to install and use – system utilizing burst disc technology adapted from the nuclear power industry.

Mark & Wedell invented the Annulus Pressure Relief System (APRS) together with Maersk Oil & Gas (Total) as a trusted overpressure protection system for oil and gas well stimulation treatments and intervention up to 10,000 psi (690bar).

Accurate
Precise
Reliable
Safe

Zero incidents on more than 1,000 well stimulation jobs over 30 years.

The APRS has been used world-wide by 10+ oil and gas companies and service companies such as Shell, BP, Equinor, Aker BP, Maersk Oil & Gas (now TotalEnergies), Hess, Itacha Energy, Halliburton, Schlumberger and Stimwell Services.

Used in over 1,000 jobs, APRS supports safe and controlled pressure management during oil & gas well treatment in locations including the North Sea, Middle East, Kazakhstan, and the South China Sea.

Can be used for live or closed annulus operations onshore and offshore
For acid stimulation in limestone formations and propant stimulation in sandstone reservoirs

	Advanced – yet simple: The M&W Annulus Pressure Relief System (APRS) is a compact, easy-to-install solution for well stimulation treatments and interventions based on burst disc technology adapted from the nuclear power industry
	Proven globally: Used in over 1,000 well stimulation jobs by more than 10 oil and gas companies and service providers: Shell, BP, Equinor, Aker BP, Maersk Oil & Gas (now Total), Hess, Ithaca Energy, Crescent Petroleum, Halliburton, Schlumberger and Stimwell Services. Field-tested in harsh environments across the North Sea, Middle East, Kazakhstan, and the South China Sea.
	Can be used for live or closed annulus operations onshore and offshore Effective for both acid stimulation in limestone and; propant stimulation in sandstone
	Certified Safety & Performance Accuracy: +/- 2% Proven Reliability Over Traditional Systems: Unlike spring-loaded or nitrogen operated valves, the APRS offers higher reliability, fewer premature shut-in, non-productive time (NPT) and job cancellations Type approved by DNV System: ASME B31.3 (6,000 psi) / API 6A (10,000 psi) Burst Discs: PED 2014/68/EU Cat. IV, EN/ISO 4126-2 for quality and safety compliance
	Pressure range customized to your needs: (± 10 psi from 1,500 – 10,000 psi/ 103 – 690 bar)
	Continuous Operation – Without Downtime Enables parallel rig-up with two or more units If the active line bursts, switch to the backup in under a minute minimizing downtime and ensuring uninterrupted operation Avoids off-set reset issues tied to spring/ N2 valve systems
	Mark & Wedell offers 24/7 service and fast global delivery for critical oil & gas safety system needs Any unused burst discs can be returned to Mark & Wedell and warehoused free of charge Ready for the next stimulation job

Testimonials

“It is a good and reliable system. It has never let us down and it is easy to use.”

– Jakob Monberg, TotalEnergies

Erik Jakobsen, Senior Well Stimulation Engineer (ex-Hess)

Jakob Monberg, Global Well Stimulation Specialist (Total)

Presentation

The M&W Annulus Pressure Relief System is a compact, easy-to-install solution for well stimulation treatments and interventions based on burst disc technology adapted from the nuclear power industry.

Read the presentation to understand what roles the APRS has in well stimulation jobs, how it is installed and where and by who it is used.

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Brochure

Download the brochure for the M&W Annulus Pressure Relief System. Overpressure protection for oil and gas well stimulation and intervention based on burst disc technology adapted from the nuclear power sector.

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