Control system principalECSRCSDCS

DCS principalPositioning / DrillingHydraulic systemOP Panel (Hydraulic)

ECS principalPositioning / DrillingOP Panel (Electrical)PLC Unit (Programmable Logic Control)

RCS principalPositioning / DrillingRCS system (Rig Control System)Computer network=CPUCPUCPU

DCS->ECS->RCSe.g. Setting the BoomDCSECSRCS

DCS->ECS->RCSe.g. DesignDCSECSRCS

DCS->ECS->RCSe.g. Design Boltec panelDCSECSRCS

Fault finding DCSDCS

Fault finding ECSECS

Fault finding RCSRCS

Summary

Control system principalExplain the principal of the three different control systems.

RCSRCS stands for Rig Control System. The RCS consists of a series of modules (Computers) connected in a networks that handles the functionality of the rig. The modules are located as close to the function as possible.

ECSECS stands for Electric Control System. The ECS consists of a central PLC unit that handles the functionality of the rig.

DCSDCS stands for Direct Controlled System. Consists of a series of hydraulic valves, the system is controlled by using levers to direct the hydraulic flow to the function it is suppose to control.DCS PrincipalThe hydraulic panel consists of a number of levers that is operating direct on hydraulic valves to direct the hydraulic power to control the functionAll operations is controlled by the hydraulic system. mechanically a valve is controlling another valve who is operating a cylinder. The system is noisy for the operator compared to electronically controlled systems because he has all the hydraulic hoses inside the control panel. The functions of the DCS is limited by the amount of valves used, to get advanced functions alot of valves has to be used.ECSThe ECS in controlled by a PLC unit = simple CPU (central processing unit) that can perform instructions step by step. This is instead of having a large amount of relays that turns the different functions on and off.The PLC system then steer out direct to the valve that operates the cylindersOther electronic options (TAS, FAM, BEVER HQS) is separate assemblies, and systems designed by sub-suppliers.RCSThe operators panel is integrated into the control system.The control system is divided into a number of computers connected into a network that handles all the functionality of the rig.All individual computers Modules perform its own task.All options are integrated into the RCS instead of mounting sub-suppliers designed equipment on the rig for different options. To add more options just add more modules Compared to the PLC the RCS has a much faster data transfer and is much more exact therefore the control of the hydraulic system is much better.Example : Adjusting boom movementsDCS settings: Adjustments on the DCS is done on directly on the valves with screwdrivers and wrenches.ECS settings: Adjustments is done by turning knobs on potentiometers and also screwing with a screwdriver on amplifiers at the same time as a voltmeter is connected.RCS settings: Adjustment and settings are done directly on the screen with the buttons on the control panel.DCS:The hydraulic system controls everything and therefore the amount of hoses is of course large. One hose for each function

ECS:One single CPU controls the rig functionality and everything has to start from here -up to 70 connection cables used. All of the cables has to be drawn from the central (PLC) to the function it is suppose to control.

RCS:With distributed computer power the Module is located as close to it's functions as possible. Simple Cables between modules located near the function, results in lesser cabling compared to the ECSDCS:The control panel has a lot of different lever to control the different functions of the rig.

ECS:One control panel to handle the functions of the rig with a lot of levers, buttons and switches.

RCS:A compact control panel with multifunctional levers and buttons which controls everything from settings to functions on the rigFault finding DCSFault finding on DCS is done by connecting manometers directly on the hydraulic hoses and valves and checking if the value of the pressure is correct. This is not a very convenient method of performing fault finding, a lot of different hoses and valves to test and a lot of tools are needed.Fault finding ECSFault finding on a ECS is done by connecting a multimeter on different output and inputs and measuring if the value is correct. There are a lot of different inputs and outputs that may be hard do locate.Fault finding RCSFault finding on the RCS is done directly on the screen, the system will show On Screen information about what's is wrong. In some cases fault finding can be aided by using the specially developed service bag.SummaryThe differences illustrated in this presentation is mainly showing the principal and mainly physical differences.There are plenty of things that have changed and been improved when moving from DCS-ECS to RCS more information will follow during the rest of the course.