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All Journal Sriwijaya International Seminar on Energy-Environmental Science and Technology
Abdul Razak Ismail
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Computer Science & IT Energy Environmental Science

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Improve Performance of Water-based Drilling Fluids Abdul Razak Ismail
Sriwijaya International Seminar on Energy-Environmental Science and Technology Vol 1, No 1 (2014)
Publisher : Sriwijaya International Seminar on Energy-Environmental Science and Technology

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The significant of exploring deep wells is increasing rapidly to fulfill the global oil and gas demand. Deepwater drilling in offshore operations found negative impact on the drilling fluids rheological properties when exposed to high pressure high temperature conditions. Hence, designing drilling fluids for drilling in these type of wells are the major challenges. In this study, the impact of multi-walled carbon nanotube (MWCNT) and nano metal oxides (titanium oxide, aluminum oxide and copper oxide) on the rheological properties of water based drilling fluid were investigated. The influence of different concentrations of nanoparticles on the rheological properties of water-based drilling fluid was investigated at room and elevated temperatures. The experimental results showed that the filtrate loss of the water-based drilling fluid is reduced around 65% and mud cake thickness is reduced about 30% in the presence of 1 g of MWCNT. Water-based drilling fluid with metal oxide also produced low filtrate loss. For example, water-based drilling fluid plus titanium oxide achieved more than 50% reduction in fluid loss and the filter cake thickness reduced to about 30%. Furthermore, significant improvements are seen in the rheological properties such as yield point, plastic viscosity and gel strength of the water-based drilling fluid with the presence of metal oxide and MWCNT. Overall, the application of nanoparticles on the rheological properties of water-based drilling fluid delivers on great benefits.
The Application of Biodiesel as an Environmental Friendly Drilling Fluid to Drill Oil and Gas Wells Abdul Razak Ismail
Sriwijaya International Seminar on Energy-Environmental Science and Technology Vol 1, No 1 (2014)
Publisher : Sriwijaya International Seminar on Energy-Environmental Science and Technology

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Abstract

The oil and gas industries need to use oil based drilling fluids to drill troublesome rock layers such as sensitive shale formation or to drill very deep oil and gas wells. However, using oil based drilling fluids will create pollution and therefore, environmental regulations on discharge of such drilling fluids have become more stringent because it will give tremendous impacts on the marine life and ecosystem. This research is conducted to formulate a new environmental friendly drilling fluids using vegetable oils derived biodiesel to replace the oil based drilling fluids without reducing their performances. This study focuses on physical properties and biodegradation rate of biodiesel based drilling fluids with respect to its toxicity and compare with the conventional oil based drilling fluids. Several biodiesels which derived from vegetables oils such as palm oil, corn oil and rice bran oil have been used as base oil in formulating ester based drilling fluids. Acute toxicity test and biodegradation test using closed bottle method were tested using local fishes. The result showed that almost all vegetable oils achieve the required physical properties. However, rice bran oil is almost non-toxic since their 50% lethal concentration (LC­50) value is felt in the range of 10,000 to 100,000ppm. Besides, rice bran oil is found to be easily degraded as it showed about 80% of biodegradation rate within 28 days. Therefore, rice bran oil drilling fluid offer the best solution in solving the environmental standards compared to other vegetables oils.
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