GLOBALOFFSHORE.CO.UK

CASE STUDY

Utilising the state of the art Q1000 to trench umbilicals for the Bøyla Development Project

In 2014, trenching services, on behalf of Q1000 Technip Norge AS, were completed on the Bøyla Development Project in the North Sea.

Utilising the highly capable Q1000 jet trencher along with a team

of experienced operators, trenching services were conducted

on the Bøyla project, located 225 kilometres West of Stavanger,

Norway, at a water depth of 120 metres.

The project also included associated engineering, procedures

and onshore and offshore project management necessary to

complete the trenching workscope.

Q1000

The Q1000 is an industry-leading jet trenching ROV embracing

the latest technologies in jet trenching and ROV design and was

chosen for this project for its 750kW of total installed power

and 700kW of variable jetting power - the Q1000 is capable of

trenching pipelines, umbilicals and cables up to three metres in

the seabed.

The proven design has been upgraded to operate in either high

pressure mode or high flow rate mode depending on seabed

conditions

Global Offshore, part of the Global Marine Group, delivers the company’s cable installation, repair and trenching services. The Group has a significant track record in offshore renewables and power, and this is one of many case studies that demonstrates our collaborative experience.

KEY FACTS

Client: Technip Norge AS

Submersible: Q1000

Vessel: Despina

Scope of work: Trenching of umbilicals. Survey & reporting.

Completion date: 2014

Location: 225km West of Stavanger, Norway

Length: 28km

Water depth: 120m

For further information on Global Offshore please visit: GLOBALOFFSHORE.CO.UK or contact our sales team.

UK: +44 1245 702000

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PROJECT HIGHLIGHTS

• Zero lost time incidents throughout the project lifecycle

• Trenching completed within anticipated specifications and

ahead of schedule

• Detailed surveys undertaken and processed leading to the data

being delivered to client requirements ahead of demanding

timescales

TOOLS & TECHNIQUES APPLIED

The Q1000 jet trencher was mobilised to the Despina along with

a high end specification survey spread to the on-board Triton

WROVs to allow surveys of the umbilical.

Pipelines were both trenched and backfilled and OOS data

collected and processed.

PROJECT SPECIFICS

Throughout the trenching operations, Q1000 real-time data

was collected and aligned with the survey positioning in post

processing. Sword depth, load and pump data was monitored and

referenced.

The resulting trench was surveyed by the XLR 07 ROV travelling

at a constant altitude and speed, gathering doppler velocity log

(DVL), multi beam echo sounder (MBEL) and TSS survey data for

a detailed and comprehensive record of the trenching outcome.

“For trenching of the umbilicals on the Bøyla Project, Technip Norway selected the Q1000 Jet Trencher for the work.

The operation met all expectations, including technical capability, reliability and QHSE expectations. The work was performed in less time than scheduled.

The trenching of approximately 28 kilometres of umbilicals proved to be most satisfactory.”

Oddbjørn Nupen Project Director, Technip Norway