Wettability Test Apparatus Part No. C1001
This instrument and procedure are specific to dealing with wettability evaluation of spacers and/or preflushes designed to water-wet the surfaces cement is expected to bond to after said surfaces have been exposed to non-aqueous fluids, specifically oil and synthetic-based drilling fluids. Both the apparent wettability of various mud/spacer interface volumes and the apparent wettability of just the spacer system against oil-wetted surfaces can be evaluated.
Normally, oil-external fluids are not electrically conductive, whereas water-based spacers are; actual conductivity depending on the solution chemistry of that fluid. The apparatus shown in Figures 1 measures both the surface-acting and electrical properties of the fluid being tested. The accompanying circuitry takes the electrical activity in the fluid and on the electrode surfaces and provides a continuous reading to reflect the apparent wettability of the fluid measured in the dimensionless unit of Hogans (Hn).
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