Abstract
Abstract The micro bubble (colloidal gas aphron) based drilling fluids have the unique pore blocking ability which helps reducing the drilling fluid invasion into the reservoir. The effects of time, temperature and pressure on the size and stability of the microbubbles need to be better understood in order to design a fluid that will have minimum filtration loss into high permeability zones. A non-aqueous micro bubble based drilling fluid was formulated by using mineral oil (light paraffin oil composed mainly of alkanes and cyclic paraffins) as a base fluid, an oil soluble polymer (Styrene Ethylene/ Propylene Linear copolymer) and a non-ionic oil-soluble surfactant (Sorbitan Fatty Acid Ester). The effect of polymer and surfactant concentration on the aphronized drilling fluid characteristics was studied earlier to formulate an optimum drilling fluid composition. In this study, effects of temperature and pressure on the rheology, filtration loss characteristics, and the stability of non- aqueous micro bubble based drilling fluids were investigated. PVT analysis was also conducted to develop an equation of state for non-aqueous micro bubble based drilling fluids.
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