Water to Gas Pipeline Conversion & Re-Injection Study
Year:
2021
Client:
Anasuria
Region:
North Sea
Business Unit:
Subsea / Pipeline
D7 was contracted by Anasuria Operating Company (AOC) to perform a feasibility study review to use the two existing WI pipelines as gas injection services.
Project Background
Anasuria currently exports 10 MMscfd of dehydrated gas at circa 150 barg into SEGAL pipeline. At a recent mandate, SEGAL has notified AOC that they are only able to meet Anasuria and Cook export requirements on a reasonable endeavour basis starting from Q4 2021. Any SEGAL export route restriction shall be bean back or flaring.
Problem Definition
Due to the gas export restriction into the SEGAL pipeline, Anasuria has considered utilising the dehydrated gas for additional enhanced oil recovery (EOR) by reinjecting the gas into the WI well to promote oil recovery. The WI pipeline options considered in the feasibility study are: -
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Option 1 – Gas-injection into GUA-W1 via Guillemot WI pipeline.
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Option 2 – Gas-injection into CO-W1 via Teal / Cook WI Pipeline.
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Option 3 – Considering reinjecting majority of the produced / circulating gas into GUA-P2 well for long term storage via gas lift line.
Scope of the Studies:
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Pipeline mechanical strength review
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Material compatibility study
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Topside facilities modifications
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Required subsea modifications