The use of scale-inhibitor squeeze treatments to prevent downhole deposition of carbonate and sulphate scale is a well-stablished procedure in both onshore and offshore oil production facilities. Such treatments are used in production wells when the watercut reaches a level where scale formation is considered to be a problem that cannot be economically controlled by remedial dissolution of the deposits. Increasing the squeeze life is the key parameter in optimizing the treatments. Many ways and solutions for optimization of treatments have been suggested. In this study we are interested in the ways which are related to gravity effects and generally the objective of this project is to investigate the effect of gravity on the different stages of a treatment.