This report describes the underwater work carried out in the period between the 29th January and the 2nd of March of 2008 in the Anomalía Field for SIPETROL.
This work was carried out from the DSV Skandi Patagonia set up in DP and using a team of air divers deployed from a diving stage in surface supply mode and a team of divers in saturation deployed from a diving bell and using mixed gas.
In order to accommodate the time frame involved the work programme has been divided into various phases. This Report will cover the 2nd phase of the programme.
The work programme consists of the renewal of the existing 8” oil pipelines which connect AM2 and AM3 Platforms with the shore base at BRM ( Base de Recepción de Magallanes). Previous to the 1st Work Period and while the diving work was in progress the Construction / Lay Barge “Yagana” laid the new pipelines.
In the first phase of the programme the DSV Skandi Patagonia carried out the following diving work:
1. The 8” Coflexip line from AM3 – BRM was disconnected at the riser and pipeline end and was towed clear of AM3 Platform and wet stored in a designated area.
2. The old 8” riser AM3 – BRM was removed and recovered. All of the existing riser clamps were left in place to be used for installation of the new riser.
3. The 8” Coflexip line from AM2 – AM3 was disconnected at the riser and pipeline end and was towed clear of AM2 Platform and wet stored in a designated area.
4. The 8” Coflexip line from AM2 to AM3 was disconnected at the old pipe-line end and lifted 2 m clear of the pipe-line and laid on the seabed.
5. At AM3 Platform alternate riser clamp face plates were removed.
6. The misalignment spool on the BRM – AM3 existing pipeline was removed and recovered.
7. Blind flanges were installed on the redundant pipelines:
I. AM3 – BRM
II. AM2 – AM3
III. AM3 – AM2
IV. BRM – AM3
As-built videos were made to show blind flange installation.
8. Sleepers were placed on the sea bed on the W side of AM3 Platform for laying of AM2 – AM3 pipeline.
9. The flood valve on the pulling head at AM3 – BRM pipeline was opened to allow the line to flood.