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POREPAC - Preventing loss of near-well permeability in CO2 injection wells

POREPAC - Preventing loss of near-well permeability in CO2 injection wells

Underground CO2 storage entails injecting CO2 into porous rock reservoirs. The rock pores may for various reasons clog during the operation, such that the flow is reduced or even stopped. In the POREPAC project we will try to gain understanding of how the conditions around the injection well, as well as starts and stops in the injection, affect the risk of clogging.

CO2 storage projects involve the pumping CO2 from injection wells into porous underground rock formations. An important prerequisite is that the injection can be done in a safe and efficient manner, and this requires sufficient flow of CO2 from the well into the formation. CO2 injection has shown to be challenging in several cases, since there are many potential mechanisms than can lead to clogging of the near wellbore area. In this project, we have chosen to study some of the clogging mechanisms from an operational perspective; that is, we will try to understand how the conditions in the near wellbore area, such as stresses, pressure, temperature, flow, and rock type, as well as stops and starts in CO2 injection, influence the risk of clogging. This could be caused by e.g. salt precipitation, wax or hydrate formation, bacterial films, clay swelling, and transport of fines from partially crushed rock around the well. Small scale flow experiments will be performed to study fundamental clogging mechanisms. Medium scale injection experiments will be done on rock specimens formed as downscaled injection wells using a specially designed true triaxial instrument capable of replicating the unique stress, pressure, temperature and injection patterns of a real injection well. The results will be implemented in a simulator tool for planning and operation of CO2 injection wells.

The project is funded by The Research Council of Norway

TCCS-10

The 10th Trondheim CCS Conference is an internationally leading CCS conference. It was held June 17-19 in Trondheim, Norway. At the Conference, international researchers, policy makers, industry and academia gathered to present and discuss the latest CCS research.


 

Published 12 November 2018
Research Manager

Project start

01/01/2018