51316-7649-Corrosion Management Challenges Related to CO2 Enhanced Oil Recovery on Existing Production Infrastructure

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Product Number: 51316-7649-SG

ISBN: 7649 2016 CP

Author: Gareth John

Publication Date: 2016

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There can be significant corrosion management challenges resulting from planned CO₂ Enhanced Oil Recovery (EOR) projects in relation to new & existing oil & gas production infrastructure covering existing production wells subsea pipelines and offshore process facilities.

The CO₂ EOR project presented will involve water alternating gas (WAG) injection into an existing reservoir via new injection wells. It is planned that 1 to 3 years of seawater injection will be followed by gas injection at 5000 psig / 350barg of up to 41mmscfd (1.16 Msm³/d) of CO₂ rich gas (80mol%) into the mature reservoir. Reservoir modelling indicates that within 18 to 24 months water and CO₂ breakthrough will occur initially at the new producing wells but eventually this will occur at existing producing wells also. The CO₂ rich (up to 50 mol%) and high water cut (up to 80%) production fluids will be transported via existing subsea pipelines to offshore processing facilities for separation and export.The different corrosion management options for elevated CO₂ and produced water operating conditions were reviewed to develop a range of corrosion control / material selection options for new delivery pipelines injection wells and producing wells and additional corrosion control (with associated corrosion monitoring and inspection requirements) for existing production flowlines and process equipment.