Study addresses SCP causes in CO2 injection, production wells

Hongjun Zhu Yuanhua Lin Dezhi Zeng Dapeng Zou Southwest Petroleum University Chengdu, Sichuan China High sustained casing pressure (SCP) threatens worker safety and wellbore integrity. It can be exacerbated in a CO2 environment, such as in CO2-drive injection and production wells, by CO2's corrosive effects. This article reports on investigations of the causes of SCP in CO2-drive injection and production wells. It discusses tubing and casing leaks, poor cement quality, and packer failures. Four kinds of effects—piston effect, spiral effect, expansion effect, and temperature effect—can lead to deformation of tubular goods. Which effect may create the greatest impact depends on the speci...

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