Abstract
There have been many improvements on the drilling fluids due to the increased amount of environmental and safety concerns. Decreasing the amount of toxic additives found in the drilling fluid can help to reduce the environmental impact. It is very important to have an in depth knowledge of all the properties of drilling fluids in order to design an effective mud. This is because drilling fluids can have great variations in different properties such as rheology, fluid loss, density, viscosity, pH etc. Various effective additives can be used to change the properties of the mud as required. In light of the above fact, new additives have been introduced and the purpose of this research is to test these new additives used in drilling fluids as well as to understand the effect of these additives on the properties of the drilling fluid such as filtration rate, filter cake thickness, pH, and viscosity in order to improve the drilling performance. The new additives used in this experiment are rice husk ash (RHA), hay barn (HB) and hay barn ash (HBA). Initially, an experiment is conducted to understand the rheological properties of these additives before adding them to the mud. Later, different percentage of these additives is added into the plain mud at different temperatures and pressures and various tests are performed based on API standards. Key words: Rice husk, rice ash, hay barn.  
Highlights
Rice husk mud-use RH instead of rice huskIn developing countries like India, Nigeria and Thailand, rice husk is seen as an agro waste product
The rice husk ash (RHA) will not improve the rheological properties of the mud, as the results shows; there is a decrease in the yield point (YP) compared to the standard concentration of plain mud for both samples
Based on the results shown, adding hay barn and hay barn ash leads to an increase in YP, Gel strength (GS) and PV only if the amount of hay barn added is more than 20 g, for both 5 and 10% bentoniate mud in Figures 9 and 10, compared to the standard mud
Summary
In developing countries like India, Nigeria and Thailand, rice husk is seen as an agro waste product. This is due to the lack of technical knowledge on its potential use as an additive. It is referred to as rice hull in literature It contains a mixture of antioxidants as well as oil (12-13 wt.%) and 4.3 wt.% of highly unsaponifiable components. This fraction includes: A form of vitamin E named, tocotrienols (Figure 1), gamma-oryzanol (Figure 2) and beta- sitosterol (Figure 3). Rice husk contains ferulic acid (Figure 4), and high amounts of dietary fibers
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