A Laboratory Study on Oilwell Cement and Electrical Conductivity

Abstract

TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractUsing electrical conductivity as a parameter to characterise the curing of cement slurries show promising results.The paper describes how to measure conductivity, including practical observations and gained experience. We found that conductivity as a function of time for each slurry exhibits a characteristic curve form which clearly shows the curing behaviour. A relationship between conductivity and compressive strength was obtained and it was confirmed that rapid curing will reduce the risk of gas migration. Some observations on curing vs. additives are presented as well.Measuring electrical conductivity is easy, and as such, could be used in the laboratory as a supplement to the equipment recommended by API, or in the field as a quality control during cementing operations.