Oil-in-water (O/W) emulsion drilling fluid is one of the most important low-density drilling fluids suitable for depleted fractured reservoirs for avoiding formation damage during oil and gas well drilling. In this work, an attempt has been made to study the rheological and filtration properties of oil-in-water emulsion drilling fluids containing guar gum as viscosifier and calcium carbonate as filtration controlling agent. Test results have shown that guar gum shows vicosifying properties for oil-inwater emulsion drilling fluids (diesel oil as dispersed phase and KCl brine as continuous phase). The stability of the emulsion systems was well achieved by an anionic, water soluble and biodegradable surfactant. The filtrate loss was mainly controlled by CaCO3.. The filter cakes formed were thin, impermeable and the volumes of filtrate obtained were within the limits reported in literatures. Drilling fluid combinations were developed by varying concentration of guar gum and CaCO3 to examine the effect of these additives on emulsion and these combinations have shown favourable rheological and filtration properties up to 70?C; these can be used for the better drilling performance in depleted fractured reservoirs.
Development of Emulsion Based Drilling Fluid System for Depleted Fractured Reservoirs
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Oil-in-water (O/W) emulsion drilling fluid is one of the most important low-density drilling fluids suitable for depleted fractured reservoirs for avoiding formation damage during oil and gas well drilling. In this work, an attempt has been made to study the rheological and filtration properties of oil-in-water emulsion drilling fluids containing guar gum as viscosifier and calcium carbonate as filtration controlling agent. Test results have shown that guar gum shows vicosifying properties for oil-inwater emulsion drilling fluids (diesel oil as dispersed phase and KCl brine as continuous phase). The stability of the emulsion systems was well achieved by an anionic, water soluble and biodegradable surfactant. The filtrate loss was mainly controlled by CaCO3.. The filter cakes formed were thin, impermeable and the volumes of filtrate obtained were within the limits reported in literatures. Drilling fluid combinations were developed by varying concentration of guar gum and CaCO3 to examine the effect of these additives on emulsion and these combinations have shown favourable rheological and filtration properties up to 70?C; these can be used for the better drilling performance in depleted fractured reservoirs.
Publication Mode |
Online |
---|---|
Publication Author |
Praveen K. Jha, Vikas Mahto, V. K. Saxena |
Publication Language |
English |
Publication Type |
Conference Paper |
Publication Year |
2016 |
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