| dc.description.abstract | In the petroleum industry, cement plays a crucial role during well operations as it connects the casing pipes to the formation and forms a seal that prevents fluid migration, ensuring well integrity. The ability of the cement to form a strong bond with the formation and casing pipes is an important consideration in designing slurries. In this study, we aimed to investigate whether an expanding cement slurry requires greater force to push compared to a non-expanding slurry. For our experiment we have used two different slurries, namely Neat Class-G with no additives and Halliburton blend containing 5% MicroBond for expansion. We conducted repeated push-out testing on each cement plug at weekly intervals for three weeks, with three independent specimens created for each batch to minimize errors. This experiment enabled us to evaluate the response of the cement plug after experiencing the effect of time and multiple push-out events and subsequently re-establishing bonding with the casing. The push-out testing is used to monitor the shear bond strength, which should be greater than the stress acting on the interface to ensure that the cement sheath remains intact during drilling and production operations.
In addition, we wanted to find a correlation between linear and volumetric expansion. The expansion experiments provide important insights into the push-out testing, as expansion has an impact on the shear bond strength. We performed API-ring testing along with our very own volumetric expansion experiment, to investigate the linear and volumetric expansion. Using these results, we verified a mathematical relationship between them | |
