OneSubsea MARS Multiple Application Reinjection SystemEnabling processes for every well

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 high-risk and costly intervention

to the field architecture. The MARS system enables

flexibility and choice for production optimization in new

and existing fields, providing:

Low-cost intervention

Low-risk intervention

Cost-effective wellhead processing

MARS 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.

MARS-EnAblEd PoSSibilitiES

MARS 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

HIPPS

Well Kill

Flushing

1

MARS tEchnOlOgy

Sensor Replacement

Subsea Processing

HIPPS

Separation

Sand Filtering

Water Injection Pumping Multiphase Pumping

Process Metering

Existing Choke Body

on Tree

MARS Dual-bore

Insert

MARSProcess Module

From Well

To Flowline

2

MARS Injection InsertTypical Section

(Flowline Flow Path)

Flowline Flushing

Existing Choke Body on Tree

Existing Choke Body on Tree

Well Stimulation Chemical Injection

Well Kill

Well Stimulation Chemical Injection

MARS Injection InsertTypical Section

(Well Bore Flow Path)

MARS Injection ChokeTypical Section

3

thE MARS SyStEM in thE fiEld

Gulf of MExico

In 2007, the first subsea multiphase pump was

installed in the Gulf of Mexico in 5430 ft (1700 m)

water depth. Using two MARS 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 technology, two off short-term injection

inserts and two off injection skids. The deployment

system used two off reelers complete with 2 x 2461

ft (750 m)-long hoses, a 1/2 reeler complete with a

1/2 x 2461 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. Scale-

squeeze operations have been ongoing on a regular basis

since installation.

Following the successful application of MARS

technology offshore Angola, similar MARS technology

for multiphase metering was applied throughout a

field offshore Nigeria in 2953 ft (900 m) water depth

at pressures up to 5000 psi and temperatures between

-0.4 F and 216 F (-18 C and 102 C). A total of 24

dedicated flowbase manifolds have been supplied, which

house the retrievable MARS-enabled multiphase

flow meters.

4

noRth SEA

MARS 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 technology at the first field, subsea

scale-squeeze 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 MARS-enabled choke, the operator

effectively gained a new safe-access point into both their

reservoir and the pipeline system.

At this field, MARS 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 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.

5

4646 W. Sam houston pkwy. n.

houston, tX 77041

uSA

tel 1 713 939 2211

5 Mondial Way

harlington

hayes, uB3 5AR

England, uK

tel 44 208 990 1800

Sandslikroken 140

pO Box 174

Sandsli, n-5862

Bergen, norway

tel 47 55 92 88 00

level 11, 12-14

the Esplanade

perth, Western Australia

6000

tel 61 8 6389 5000

MARS

pavilion 4, prospect Road

Arnhall Business park

Westill, AB32 6fE

Scotland, uK

tel 44 1224 748 460

www.onesubsea.com

2013 cameron | OneSubsea and MARS are trademarks of OneSubsea. | SB 1M 05/13 Ad00625OSS