COMPRESSIVE STRENGTH AND SHEAR BOND STRENGTHudOF OIL WELL CEMENT WITH CALCIUM CARBONATEudAND SILICA FUME

摘要

One of the critical factor of cementing operation is designing the cement slurry. Forudthat reason, slurry properties which have been classified by American PetroleumudInstitute (API) should be changed so it will match the requirements of reservoirudcondition. Changing the slurry properties is done by adding the additives into theudcement slurry. This research objective is to test the effect of calcium carbonate andudsilica fume to the oil well cement. The result of this research are the data of oil welludcement physical properties, compressive strength and shear bond strength. The dataudare collected by making cylinder sample with 75 mm x 150 mm for the compressiveudstrength specimen and cylinder with 1 inch x 2 inch (25.4 mm x 50.8 mm) for theudshear bond strength specimen that will be tested on Shimadzu Universal TestingudMachine, which is then the result of the test will be compared to the API standardudand result from other researches. The specimen will have 5 variants percentage ofudsilica fume and calcium carbonate (0% calcium carbonate (CC) + 0% silica fumeud(SF), 5% CC + 5% SF, 10% CC + 10% SF, 15% CC + 15% SF, and 20% CC +ud20% SF) and 3 variants of cement age (7, 14, and 28 days). From the performanceudof cement with calcium carbonate and silica fume in the laboratory test, it can beudconcluded that by adding calcium carbonate with 5% or more into the cement slurryudwill reduce both compressive strength (22.253 MPa (0% CC + 0% SF), 19.803 MPaud(5% CC + 5% SF), 12.963 MPa (10% CC + 10% SF), 10.264 MPa (15% CC + 15%udSF), 9.526 MPa (20% CC + 20% SF)) and shear bond strength (3.139 MPa (0% CCud+ 0% SF), 6.849 MPa (5% CC + 5% SF), 3.695 MPa (10% CC + 10% SF), 3.065udMPa (15% CC + 15% SF), 2.596 MPa (20% CC + 20% SF)). The usage of silicaudfume is to reduce the loss of compressive strength caused by calcium carbonate, itudcan be seen in the comparison between the result of this research (19.803 MPa (5%udCC + 5% SF)) and Paramatatya’s (2014) research (19.36 MPa (2.285% CC)) whereudthe compressive strength of the specimen with 5% of calcium carbonate and 5% ofudsilica fume has higher compressive strength compare to paramatatya’s sample withud2.285% of calcium carbonate.