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REDUNDANT INTEGRATED CONTROL SYSTEM FOR SUBSEA INTERVENTION OPERATIONS

IP.com Disclosure Number: IPCOM000201147D
Publication Date: 2010-Nov-09
Document File: 18 page(s) / 2M

Publishing Venue

The IP.com Prior Art Database

Abstract

A method and system are presented for enabling reliable control over subsea intervention operations. A surface control system is linked with a subsea intervention package positioned at a subsea location to enable intervention in a subsea well. The technique utilizes a control architecture that enables layers of control redundancy even with a single umbilical cable routed between the surface control system and the subsea intervention package.

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REDUNDANT INTEGRATED CONTROL SYSTEM FOR SUBSEA INTERVENTION OPERATIONS

ABSTRACT

A method and system are presented for enabling reliable control over subsea intervention operations. A surface control system is linked with a subsea intervention package positioned at a subsea location to enable intervention in a subsea well. The technique utilizes a control architecture that enables layers of control redundancy even with a single umbilical cable routed between the surface control system and the subsea intervention package.

BACKGROUND

The development and retrieval of desired fluids, such as hydrocarbon based fluids, is pursued in subsea environments. Production and transfer of fluids from subsea wells rely on subsea installations, subsea flow lines and other equipment. Additionally, preparation and servicing of the subsea well relies on the ability to conduct subsea intervention work.

Subsea intervention work includes drilling of wells, well completions and well intervention involves numerous challenges not normally faced when drilling and working on land wells or offshore platforms. In many cases, drilling, completions and intervention in subsea wells is controlled from a floating platform or ship acting in cooperation with a subsea installation. The subsea installation may have a variety of valves and other controllable components that can be controlled from the surface location. In some intervention applications, such as drilling, two or more umbilical cables are routed from the surface to the subsea installation to provide reliable and redundant control.


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In these types of redundant systems, dual control pods, commonly called blue and yellow pods, are used subsea to operate the subsea installation by either direct hydraulics, piloted hydraulics, or electric multiplex systems. Hydraulic pressure and flow is supplied from the surface vessel to each of the subsea control pods by hoses installed within each of the separate umbilical cables. In the case of the electric multiplex system, the controls are operated by communication and power cables also installed in the umbilical cables. In some applications, backup controls have also been incorporated with respect to at least some of the subsea components by using mechanical springs or acoustic systems.

SUMMARY

In general, the present disclosure provides a technique for controlling subsea drilling and intervention operations. A surface control system is linked with a Blow Out Preventer (BOP) or subsea intervention package positioned at a subsea location to enable drilling or intervention in a subsea well. A single umbilical cable is routed between the surface control system and the subsea intervention package. However, the technique utilizes a control architecture that enables layers of control redundancy.

In one aspect, the present disclosure teaches a method of controlling subsea intervention, comprising: linking a surface vessel with a subsea intervention package; routi...