1) acid well treatment 2) acid treatment 3) acidisation 4) acidization the process of forcing acid down a well into limestone or dolomite, in order to increase permeability and porosity by dissolving a part of rock constituents. It is also used to remove mud injection during drilling. The general objective of acidisation is to increase oil productivity GRM: n. (1,2,3,4) REG: British English (S), American English (4)