ANALYSIS ON CHARACTERISTIC OF SABAH BENTONITE AT IDGH TEMPERATURE UNDER DYNAMIC CONDffiON

• Main Author: Mokhtar, Zainur Azwin
• Format: Final Year Project
• Language: English
• Published: Universiti Teknologi Petronas 2008
• Subjects: TJ Mechanical engineering and machinery
• Online Access: http://utpedia.utp.edu.my/7824/1/2008%20Bachelor%20-%20Analysis%20On%20Chharacteristic%20Of%20Sabah%20Bentonite%20At%20High%20temprature%20Under%20Dynamic%20C.pdf; http://utpedia.utp.edu.my/7824/

This project is carried out to study the properties of Bentonite, particularly Sabah Bentonite. A series of experiments, by mixing the two Bentonite are conducted and comparing them to API specification, under dynamic condition, as to stimulate the real drilling process to achieve a more accurate result. The rheology properties of the drilling fluids, such as density, viscosity and yield point are obtained by conducting experiments using few apparatus, such as mud balance and direct indicating viscometer. The Fann 90 Dynamic Filtration Test Apparatus is used to get the outcome of the study by comparing the parameters of dynamic filtration rate and static filtration rate. The experiments are conducted first in Low Temperature (L T) condition and the target composition, 55% Sabah Bentonite and 45% Indian Bentonite is selected for the High Temperature (HT) condition. Sodium Hydroxide (NaOH) is then added from 0.5 ppb to 4.0 ppb for further rheological and filtration loss evaluation. The comparison of rheological properties of the three drilling fluids: Indian, Sabah and Mixture. For Sabah and Mixture, as the temperature increases, the clay swelling decreases, thus the PV, YP and GS of the mud decreases. For Indian, as the temperature increases, it caused the bentonite to become more dispersed, increasing the number of individual platelets in the suspension, thus PV, YP and GS increases. For mixture of 45% Indian and 55% Sabah bentonite, the dynamic filtration is higher than static condition at lower temperature but lower in high temperature as they are no real correlation between static and dynamic condition. Optimum of0.5 ppb ofNaOH added improved the rheological properties but not the filtration properties. The economic analysis showed that treated Andrassy sample is much cheaper than the commercial bentonite (60.71 % cheaper). This directly increases the gross domestic product (GDP) of Malaysia and can beneficiated the country. Further recommendations are suggested for next research.