Abstract
Drilling operations in recent years have gone into much deeper depths to meet the global demands. Therefore, it becomes important that the well integrity is tained throughout its life and in that respect, well cement plays an important role. For the proper application of the cement in the well, it is important to have a MKr understanding of its mechanical properties. The study will focus on the techniques to perform Unconfined Compressive Strength (UCS) tests according to API Standard (cubes) and cylinders having a length to diameter ratio of 2. Moreover, a review of ASTM and British standards for the UCS is given. This paper shows the results of more than 100 tests conducted on cement cubes and cylinders. It was observed that variation in the results existed in the UCS when cubes are compared with the cylinder, which raises the importance of the development of the new standard. The results showed the high compressive strength of the cube as much as 50% and 35% for the sample cured at high and room temperature respectively. Moreover, no correlation existed between the cylinder cured at high temperature and UCS or UPV. Whereas the cube sample was able to give a logarithmic or exponential correlation for all the testing scenarios. Hence a better understanding of the cylindrical sample is needed and the data from this research can help to compare the results from these two geometries.
NSTL