Professional paper

DESIGN AND MECHANICAL INTEGRITY OF CO2 INJECTION WELLS

Nediljka Gaurina-Međimurec
Borivoje Pašić

Abstract

Geologic Sequestration (GS) is part of a process known as “carbon
capture and storage (CCS)” and represents the process of injecting
CO2, into deep subsurface rock formations for long-term storage. For
injecting of CO2 existing wells are used as well as new drilled wells. A
well represents the most likely route for leakage of CO2 from geologic
carbon sequestration. Maintaining mechanical integrity helps prevent
the well and wellbore from becoming conduits for CO2 migration out
of the injection zone. The typical components of a CO2 injection well
are casing, tubing, cement, and packer. These components are relevant
for maintaining mechanical integrity and ensuring CO2 does not migrate
upwards from the injection zone into underground source of drinking
water (USDW); therefore helping to ensure zonal isolation of the
injected carbon dioxide. In order to have the safe underground storage
of CO2 well integrity considerations should be present during all phases
of well life including design phase, drilling, completion, injection,
workover (service) and abandonment.
The paper describes well design, well integrity and mechanical
integrity tests (MITs) as a means of measuring the adequacy of the
construction of the injection well and as a way to detect problems within
the well system.

Keywords

carbon capture and storage (CCS); injection well; CO2 injection; leakage; mechanical integrity

Hrčak ID:

75108

URI

https://hrcak.srce.hr/75108

Publication date:

4.12.2011.

Article data in other languages: croatian

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