MARS Multiple Application Reinjection System

MARS Multiple application reinjection system Installing processing hardware on existing subsea trees has been a high-risk and costly activity due to potential required field shutdown, new hardware foundation, and pipeline decommissioning or recommissioning.

The OneSubsea MARS* multiple application reinjection MARS system technology can be used for both vertical and system serves as a universal interface for trees (topside horizontal production trees in surface and subsea applications. and subsea), enabling processing equipment to be installed The system has been adopted by operators in various regions between the existing isolation barriers, thus eliminating the of the world for multiple applications, including a pump need for challenging intervention. The MARS system enables system installation in the Gulf of Mexico and well stimulation flexibility and choice for production optimization in new and systems in the North Sea and West Africa. existing fields, providing ■■ low-cost intervention ■■ low-risk intervention ■■ cost-effective wellhead processing. More Possibilities Within Reach MARS system technology enables multiple processing possibilities on new and existing wells at any time in the life of a field.

The MARS system establishes the wellhead as the unit of production, enabling the connection of production optimization systems to be installed easily in the field, either on or off the subsea tree.

The system enables any process on any well; therefore, any number of existing or emerging processing technologies can be fitted into a field with minimal risk.

Applications include ■■ multiphase pumping ■■ multiphase metering ■■ fluid sampling ■■ separation ■■ bulk water management and reinjection ■■ raw seawater injection ■■ pressure boosting ■■ chemical injection ■■ high-integrity pressure protection systems (HIPPS) ■■ well kill ■■ flushing.

OneSubsea also offers a MARS system injection choke. MARS System Technology

MARS system module

Subsea processing Separation

MARS system dual-bore insert

Existing choke body on tree Sensor replacement HIPPS

Sand filtering Process metering

From well

Water injection pumping Multiphase pumping

To flowline Flowline flushing Well stimulation Well stimulation chemical injection chemical injection well kill

Existing choke Existing choke body on tree body on tree

MARS system injection MARS system injection MARS system injection insert typical section insert typical section choke typical section (flowline flow path) (Wellbore flow path) MARS System in the Field The flexibility and multitude of subsea processing and production enhancements that the MARS system provides have benefited offshore operators around the globe. As of December 2015, more than 130 MARS systems have been installed in both brownfield and greenfield operations in most subsea regions around the world. The MARS system can help extend the production life of your subsea asset, with a wide array of low-cost, low-risk, and safer intervention operations. MARS system technology enables multiple processing possibilities on new and existing wells. The MARS system has been adopted by customers around the world.

Gulf of Mexico Nigeria in 2,953-ft [900-m] water depth at At this field, MARS system technology resulted In 2007, the first subsea multiphase pump pressures up to 5,000 psi and temperatures in a safer, faster, and more cost-efficient was installed in the Gulf of Mexico in 5,430-ft between –0.4 and 216 degF (–18 and 102 degC). operation since it was installed on both new [1,700-m] water depth. Using two MARS system A total of 24 dedicated flowbase manifolds have and existing trees. This application reduced inserts to gain access to the production flow been supplied, which house the retrievable well risk, enabled multiple-well concurrent allowed the pumps to increase production from multiphase flowmeters enabled by the campaigns, reduced vessel time and costs, mature assets by 20% and is expected to extend MARS system. reduced shutdown time, and increased the field life by 5 years. In addition, the MARS weather window. In addition, divers no longer North Sea system eliminated the installation risk normally were required to perform work in hazardous MARS system technology was used on a associated with implementing new deepwater environments. MARS system technology yielded West of Shetland fields to reinstate critical processing technology on brownfield assets. an estimated 60% reduction in opex. production management instrumentation that West Africa had failed in situ. Working with the original tree Following this success, the operator specified The system increased production from a manufacturer, replacement instrumentation was that the same technology be used at a second field offshore Angola through scale-squeeze introduced into a MARS system–enabled flow field. Here, the scope of supply included one operations on 14 wells. Equipment for this loop at the tree, which restored full functionality off injection skid assembly, four off choke project included 16 chokes modified with to the production system. changeout interface extension sets, one off MARS system technology, two off short-term choke change-out extension running tool, four The MARS system was the solution for injection inserts and two off injection skids. off choke protection plates, operational tooling, retrofitting pressure sensors and isolation The deployment system used two off reelers and project and services testing. Production valves on an existing horizontal tree using the complete with 2-in 2,461-ft (750-m)-long hoses, has been optimized due to safer, faster, and existing subsea control system while retaining a 1/2-in reeler complete with a 1/2-in 2,461-ft less-expensive (and therefore more frequent) full choke functionality. Rapid installation (750-m)-long hose, a 30-ton deployment winch, scale-squeeze operations. and redeployment was possible using an ROV an overboarding chute complete with clamping support vessel. A MARS system–enabled multiphase flowmeter station, hydraulic power unit, and associated was used via the tree cap at another field in the remote control station. The full scope of the Also in the North Sea, two fields incorporated North Sea. A single assembly consisting of a project included chemical delivery and deck MARS system–enabled subsea well stimulation MARS system and the flowmeter was deployed handling packages, making the operation safer, packages. Prior to adopting MARS system by a wireline crew. Normal “hot work” permits faster, and more cost efficient. Scale-squeeze technology at the first field, subsea scale- no longer were required as no flowlines or operations have been ongoing on a regular basis squeeze operations at that location were existing infrastructure were modified. In addition, since installation. diver intensive, infrequent, and expensive. By the system provided a low-risk, low-cost method upgrading the existing subsea trees (two in situ Following the successful application of MARS to retrofit flowmeters to every platform wellhead, and one new tree predeployment) with a MARS system technology offshore Angola, similar enabling production optimization from improved system–enabled choke, the operator effectively MARS system technology for multiphase data management. gained a new safe-access point into both its metering was applied throughout a field offshore reservoir and the pipeline system. MARS

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