Project Background

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The 24” ELM-6 (OCTLI-A) platform to the RABASA oil and gas pipeline is approximately 16 km long and it is located 29 km NW of the port of Coatzacoalcos, Veracruz. The pipeline will operate at regular pressure and temperature. Due to its location, the pipeline is in relatively shallow water, and therefore, as a safety measure, PEP's technical specifications recommend that the pipeline shall be buried at least 1 m, below the seabed for stability and safety reasons.

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Problem Definition​

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An area of dead coral outcrop was identified along the OCTLI-A to Rabasa pipeline between KP11.00 to KP14.00. Since the pipeline is unable to be trench and buried into the hard rocky area, pre-lay seabed intervention works is required to support the pipeline crossing over the rock outcrops area. D7 has been engage to design and engineer the pre-lay intervention work to the support pipeline and ensure smooth transition over the rock outcrop area. 

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Scope of the Studies:

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DASH7 was involved the design and engineering to design and engineering of the seabed intervention. The studies involved:-

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• Pipeline routing review.

• Pipeline allowable free span analysis.

• Pipeline on-bottom stability analysis.

• Rock berm stability analysis

• Concrete mattresses stability assessment.