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ModuSpec and WEST Engineering Services are now Lloyd’s Register Energy - Drilling

Dynamic Positioning &

Power Management

Awareness Training

Dynamic Positioning Training

DP / PM awareness courses have been created in response to the

increasing concern by drilling operators and oil majors, that there is a

shortage of experience and a diluted competency with regard to Dynamic

Positioning, and the specific aspects of drilling.

This is due to the very rapid expansion of the drilling market and the

global fleet of floating drilling assets.

OSV – Gulf of Mexico

Deepwater Drillship (MODU)

Semi Submersible MODU

History of DP in Drilling

Drillship Eureka – 1961

Multiple locations 9 – 1372 m (30-4,500 ft)

A Dynamic Positioning (DP) system is: (Section 2)

1. computer-based control system

2. automatically controls rig position and heading

3. calculated thruster forces

4. input from position reference systems and DP sensors

5. complex modelling and filtering techniques

DP capability applies to:

• fixed position

• follow track

• follow target

• pipelay, etc.

DP Axis’, Environmentals, & Thrusters

DP Thrust Allocation

7 Elements of a Dynamic Positioning System

DP Operator

DP Controller

- Process stations

- I/O system

Thrusters Power System - Power Generation

- Power distribution

- Power management

- Backup Power (UPS’)

Sensors - Compass (Heading)

- Wind

- Vertical or Motion Reference Units

- Draft

- Current Sensor (if fitted)

Position Reference Systems - GNSS – satellite systems

- Hydroacoustics

- Laser

- Microwave

- Tautwire

Operator Console (Human-Machine Interface)

- HMI Computer

- Operator panel

- Display screen

GPS – Global Positioning System (USA)

Hydroacoustic Positioning

• USBL – only 1 transducer of rig hull –

baseline is between transducer head

elements.

• SBL – multiple transducers on rig hull –

baseline between transducers.

• LBL – array of transponders (aka beacons)

on seabed – baseline between

transponders

DP Sensors – Wind

DP Sensors - Gyrocompasses

DP Equipment Classes – IMO 645 (Section 5)

WSOG – Well Specific Operating Guidelines

Well Specific Operating Guidelines – Outline

De

finitio

n

GREEN ADVISORY YELLOW RED

Normal operations – all

systems fully functional

and operating within

acceptable performance

limits.

Advisory status –

approaching performance

limits or reportable alarm

status. Operations may

continue whilst risks are

being assessed. A failure

has occurred that does not

affect DP redundancy.

Actionable status – pre

defined performance limits

reached, component or

system failure resulting in

loss of redundancy.

The rig / vessel maintain

position although the

vessel has lost its

redundancy.

Emergency status – pre

defined operational or

performance limits

exceeded, component or

system failure resulting in

loss of control or position.

No

. of

DG

s e

ach

Bu

s

As per FMEA and CAMO

Wa

tch

Circ

le

Lim

its

Defined for each well and

location.

Driller’s Console – System Interfaces

PMS Display – DG Status

Dynamic Positioning &

Power Management Awareness Training

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