Experimental study on the micro alkali sensitivity damage mechanism in low-permeability reservoirs using QEMSCAN

Micro minerals are selected as the research object to study the alkali sensitivity damage at both inlet and outlet sides in low permeability reservoirs. This provides references for alkali sensitivity analysis in reservoirs with similar mineral compositions. Moreover, alkali sensitivity damage mechanisms are clarified at both inlet and outlet sides in the core flow experiment, which can be correlated to actual reservoirs near and far away from wells. Then specific measures corresponding to different types of reservoirs in terms of distances to wells can be taken to restore the damage and thus achieve the recovery of reservoir capacity. The method proposed in this paper is also applicable to other reservoir sensitivity damage, such as salt and acid sensitivity damage.