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Case Studies

 

Consultants to the offshore energy industry


 
 

Tano Three Point, Deep Water Field Development

Paul Clasper and Associates

Client:             Hess Ghana
Location:         Ghana, 2013-2014

Project description:

Block and pipeline/flowline Geophysical and Geotechnical route surveys were required in up to 2800m water for the “Tano Three Points” field development. A HUGIN AUV was contracted by Hess to complete the survey acquisition with swathe bathymetry, sub-bottom profiling and separately, bottom sampling. There were 3 block surveys to cover drilling locations and FPSO anchor locations plus flowline routes between the various drilling sites.

PCAL’s role:

PCAL Energy’s role was in originating the scope of work and specifications for the data acquisition, liaising with Hess Project Engineers and providing data QC on the survey vessel. PCAL Energy consultants managed the offshore operations and were able to make decisions on-the-fly based on the most recent AUV acquisition mission.

PCAL Energy’s in-house Précis package was used to assess and validate pipeline routing to allow dynamic adjustment of the route to avoid an area of large pockmarks crossing the proposed routing. The routing was adjusted on a line-by-line basis until sufficient corridor width was achieved.

 



The result:


The project was completed in budget and frequent data updates allowed “live” routing based on assessment of data from AUV. PCAL Energy consultants assisted Hess from the tendering phase through acquisition QC to report QC and delivery. 


Iraq Crude Oil Export and Expansion Project (ICOEEP)

Paul Clasper and Associates

Client:             SOC/Foster Wheeler
Location:         Iraq, 2008 to 2012

Project description:

Iraq plans to increase its oil export capacity by constructing new pipelines to new loading facilities about 65km offshore in the Arabian Gulf.  The new facilities include a Subsea Valve Manifold and a Central Metering and Monitoring Platform feeding four new SBM’s. There was a requirement for both a large scale UXO survey and a site investigation survey for Front End Engineering Design.

PCAL’s role:

PCAL assisted the client with the contractual strategy for the surveys as well as the technical evaluation of bids.

It was decided to separate the site investigation work from the UXO search so that design work could progress regardless of the outcome of the UXO search. Two survey contractors were selected: one to undertake a bathymetric, geophysical and geotechnical investigations and the other to focus on the UXO search.

The pipeline route corridor was 65km long, about 10km of which was in water depths less than 5m.  The UXO work was undertaken from four different vessels, including a very shallow vessel towing a sled with catamaran mounted gradiometers. The initial bathymetric and geophysical survey involved two vessels, one of which was shallow draft to investigate the nearshore area. Geotechnical sampling for the pipeline routes was carried out from the geophysical vessel and deeper cores for foundation design were carried out from a specialist drilling vessel.

PCAL provided a team of surveyors and geophysicists to supervise the offshore works and quality check the data. 

 



The result:


The project has now moved into the construction phase and PCAL are providing supervision of dredging and other construction activities including pipelay and the installation of SBM’s and subsea manifolds.

 

Kingsnorth Carbon Capture and Storage Project

Paul Clasper and Associates

Client:                E.ON
Location:            Southern North Sea, 2010

Project description:     

E.ON were studying the feasibility of constructing a Carbon Capture and Storage Facility, which would involve the use of clean coal at the Kingsnorth Power Station and transferring CO2 to depleted gas wells in the Southern North Sea. This would eventually involve the construction of a new subsea pipeline extending from the Isle of Grain in the Thames Estuary to the Hewett Field.

PCAL’s role:

PCAL liaised with the appointed Pipeline Engineers and Environmental Consultants to develop an economic Scope of Work and Specifications for field survey and then prepared appropriate Tender documentation. We carried out the bid evaluation on behalf of E.ON and then assisted them with the contract negotiations.  PCAL then provided a team of surveyors and geophysicists to supervise the offshore survey, which involved multibeam bathymetry, side scan sonar and sub-bottom profiling as well as vibro-coring and CPT’s. 

The result:

The survey was completed within budget and within the allotted timescale in the project schedule.

 





Algeria-Spain Pipeline Route Investigation

Paul Clasper and Associates

Client:                MedGaz
Location:            Madrid, 2002

Project description:     

A consortium of international Operating Companies was investigating the possibility of installing a pipeline to transmit gas from Algeria to Spain. Various route options had been considered but all of them traversed water depths in excess of 2000m. Prior to this stage of the project (2002) technical limitations had prevented construction of a pipeline in such water depths.

PCAL’s role:

PCAL were brought into the project at an early stage to help define the route options. This involved a review of 30 year old data collected by manned submarine.  We provided a Senior Survey Engineer to assist with the preparation of an ITT for survey, carried out a detailed evaluation of contractor bids, helped negotiate the survey contract and then provided suitably experienced personnel to supervise the offshore works. The deepwater section was carried out using an AUV and the nearshore sections were performed with a smaller vessel using standard geophysical and geotechnical techniques. PCAL personnel remained involved throughout the reporting and early engineering phase.   

 

 



The result:

After further detailed investigation of anomalous areas the pipeline design was completed and the pipeline was safely constructed in 2008.

Expert Opinion Report

Paul Clasper and Associates

Client:                Confidential
Location:            Far East


Project description:     

Following cargo operations at a drilling rig, a Supply Vessel was accused of causing damage to an underwater pipeline by hooking it with an anchor.

PCAL’s role:

Paul Clasper & Associates Ltd were engaged to prepare an expert review of the common bundle of documents and the documents provided by the plaintiff party.

The scope of work included:
1) Review the Common Bundle of Documents and Plaintiff’s Documents as provided.
2) Assess the extent of damage to the pipeline
3) Provide an opinion on the required repair works

The resulting report detailed the condition of the assets following the incident and the scope and cost of contracted repair work required. It also summarised contractor’s commercial proposals for the repair and the history of negotiations with contractors.

The result:

The report’s conclusions commented on the state of the pipelines before and after the incident; with further discussion on the contractual implications of the execution of damage repair works.

The report was used by the vessel owner’s legal team to evaluate and challenge the repair costs incurred by the asset’s owners as a result of the incident.

 



 
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