Petrobras MSP-ENO1 - Subsea Production Manifold System

The Site

The multiplexed electro/hydraulic subsea control system is installed on the Enchova West Field Development, Brazil. The installation took place during 2000 / 2001.

The Requirement

Manifold Control System

To test and qualify an innovative prototype manifold control system that allows recovery of the manifold valves actuation mechanism and also decreases the size of the manifold to allow deployment from a semi-submersible rig.

Subsea Control

Control 8 subsea satellite Xmas trees, the furthest being up to 2500m from the manifold using two CAC dual redundant SCM's with the Master Control Station and test Master Control Station located topside.

The Solution

The manifold structure is installed in 115m of seawater, however, all components have been designed and qualified for 1000m. The manifold location is approximately 3000m from the host platform. The MSP - ENO -1 development control and monitors eight satellite Christmas Trees for oil production with the furthest well being some 2500m from the manifold structure.

The SAC (Shared Actuator Control) tool, via the SAC subsea control module (SCM) will actuate all manifold chokes and gate valves. Actuator and positional feed back will be based on pressure and flow measurement through the hydraulic supply and return lines.

One Electro-Hydraulic (E/H) control umbilical is directly connected between the Manifold and Production Platform.

The control umbilical will have dual signal on Power Lines Transmission, and dual Low Pressures (LP) & High Pressures (HP) hydraulic supply hoses.

Hydraulic supplies will be up to 5000 psi (345 barg) for the down-hole safety valves (DHSVs) and up to 3000 psi (207 barg) for all the other Xmas trees and manifold valves. Working pressures are 152 barg on LP components and 241 barg on HP components.

The subsea control system also performs data acquisition from pressure, temperature, and three permanent down-hole gauges (PDGs).

The subsea production manifold control system equipment comprises:

• Two Well Subsea Control Modules each providing control and monitoring for four wells.
• Each Well SCM contains two Subsea Electronic Modules (SEM) operating in a duty standby mode via separate power / Communication buses to the MCS.
• One Subsea SAC Control Module (SAC SEM) containing two SEMs.
• Subsea Umbilical Termination Unit (SUTU)
• One Master Control station (MCS) with two electrical Power and Communication Units (EPU) MCS/EPU.
• One Hydraulic Power Unit (HPU) and associated accumulation skid.
• Eight satellite Xmas trees, with downhole data acquisition being performed for Wells 1,2 and 3
• The Mac Manifold Subsea Process Control PLC System comprises of two GE Fanuc Series 90-70 PLC's running in a “Hot Standby” mode.

The 90-70 PLC's will communicate with the Subsea Neuron processor cards in the two Well Control SCM's and in the SAC SCM directly to recover the data from the flow meters and SAC tool position.

Each PLC system will be capable of complete operation of the subsea system in isolation.

One PLC system will operate as the Primary PLC the second PLC will operated as the Secondary PLC.

Identical software is loaded into both the Primary and Secondary PLC configured in a Hot Standby mode of operation.

The Services and Solutions

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