Relationship Between Cement Slurry Composition, Mechanical Properties, and Cement-Bond-Log Output

Summary This paper describes and quantifies the influence of cement slurry composition on the mechanical properties of the hardened cement and on the cement bond log (CBL). Laboratory experiments were performed on more than 20 different cement slurry formulations with densities ranging from 1200 to 2280 kg/m3 [10 to 19 lbm/gal]. Results show that (1) CBL attenuation rate is directly related to the acoustic impedance of the cement; (2) particulate extenders like silica microspheres provide, for a given slurry density, higher acoustic impedance and CBL attenuation rate than chemical extenders like soluble silicates; (3) latex in the cement does not influence the CBL; (4) the relationship between compressive strength and velocity of compressional waves, verified for most slurries, is not valid for salt-containing slurries; and (5) a single relationship exists between Young's modulus and Poisson's ratio.