EFFECT OF LOCALLY SYNTHESIZED CEMENT RETARDER ON THE SETTING TIME AND RHEOLOGICAL PROPERTIES OF CEMENT SLURRY
Cementing operation in oil and gas industries is an important operation in wellbore construction. In order to achieve successful cementing operation, additives are used for the designing of these cement slurries to meet the American Petroleum Institute (API) specifications. This study was carried out using API recommended practice 13B-2 (1997), to determine the effect of the synthesized cement retarder at concentrations of 0.01 gal/sk, 0.04 gal/sk, 0.07 gal/sk and 0.10 gal/sk on the setting time and rheological properties of the cement slurry. The test results obtained at various concentrations showed the setting time as: 3:06 hrs , 4:06 hrs, 5:28 hrs and 12:18 hrs and the yield point which represent the rheological values as: 78 Ib/100ft2 , 62 Ib/100ft2, 13 Ib/100ft2, and 9 Ib/100ft2. The results obtained revealed a retarding tendency of the synthesized cement retarder as the concentrations increased and a decrease in the yield point as observed in the The statistical analysis using analysis of variance (ANOVA) single factor also showed a significant difference on rheological property as the concentration increases.(Fcal ˃F critical).