Apparatuses and methods for testing wellbore fluids

摘要

An apparatus may be used to test the ability of a first fluid to remove a second fluid from a surface. The apparatus comprises a reservoir (100) that contains the first fluid and a testing cell (106) that contains the second fluid. The testing cell also contains a rotor (107) within. The first fluid is pumped into the testing cell, thereby displacing the second fluid. The displaced second fluid flows to a collection vessel (109). The apparatus is particularly useful for determining the ability of a chemical wash or a spacer fluid to remove non-aqueous drilling fluids from a metallic surface.