MARS. Multiple application reinjection system

MARS Multiple application reinjection system

Unique Technology. Universal Application. Historically, 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 system serves as a universal interface for trees (topside and subsea), enabling processing equipment to be installed between the existing isolation barriers, thus eliminating the need for highrisk and costly intervention to the field architecture. The MARS system enables flexibility and choice for production optimization in new and existing fields, providing: MARS system technology can be used for both vertical and horizontal Christmas trees in surface and subsea applications. The system has been adopted by operators in various regions of the world for multiple applications, including a pump system installation in the Gulf of Mexico and well stimulation systems in the North Sea and West Africa. Low-cost intervention Low-risk intervention Cost-effective wellhead processing

MARS-enabled Possibilities 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 process module Subsea processing Separation MARS 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 chemical injection well kill Well stimulation chemical injection Existing choke body on tree Existing choke body on tree MARS injection insert Typical section (Flowline flow path) MARS injection insert Typical section (Wellbore flow path) MARS injection choke Typical section

The 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 had 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 safe intervention operations.

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