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Comprehensive assessment of additive and class G cementproperties affecting rheology, fluid loss, setting time and long term characteristics of elastic cements

Kelesidis Vasilis, Fraim M. , Fardis M., Karakosta E., Diamantopoulos G., Arkoudeas P., ElHardalo S., Lagkaditi L. , Papavassiliou G.

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Summary

Cement sheath integrity is very important in drilling and completion. Several additives are used to aid the process of preparing flowable cement slurry gaining sufficient strength over time. Sheaths need to be elastic and resilient and withstand several temperature and pressure cycles over the life of the well. Technology has made today available very sophisticated equipment. We present a comprehensive laboratory assessment of properties of various additives which formulate non-foamed elastic cements to determine optimal quantities and to associate them to short and long term cement properties, rheology, fluid loss, thickening time, compressive and tensile strength and elastic properties.We focus on the study of additives for producing elastic cements including effect of nanoparticles using XRD, XRF and SEM, Unconfined Compressive Strength, Cat-scanning, rheological and fluid loss measurements, NMR at P,T, for monitoring hydration kinetics and gel formation at downhole conditions. We monitor shear and compressional waves at P,T to estimate thickening time, compressive strength and static gel strength evolution. Thus we combine a multitude of measurements, to provide comprehensive assessment of the effect of additive properties on the mechanical properties of the elastic cements.Elastic cements are used in difficult environments where more cement elasticity is required to prevent casing debonding. We test efficacy of various additives on improving their properties. Protocols are presented on how one can utilize optimally the design and the implementation of different analysis to evaluate the effectiveness of additives on the mechanical properties of elastic cements.Additives have been developed to improve elastic properties of cements. Property measurements are routinely implemented in such materials. We correlate advanced NMR and Ultrasonic measurements in downhole conditions and integrate them with all other available laboratory measurements to provide means for determining optimal additive concentrations and to assess the use of nanoadditives on the properties of elastic cements.

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