In this study, the effect of sodium dodecyl sulfonate (SDS), as a well‐known flotation collector, on talc grinding was investigated using a statistical design in terms of solids%, pH, grinding time, and SDS dosage taking the d80 of the ground product as a response. The results indicated that the factors under study significance order were grinding time > solids% > SDS dosage > pH. In addition, the interactions between solids % and the grinding time and between the solids% and SDS dosage significantly affected the product d80. More interestingly, the presence of SDS not only improves the grinding process at short grinding times but also it enhances the grinding at higher pH values. The optimum conditions for talc grinding are similar in the absence or presence of SDS in terms of factors under study, except for solids%. The vital role of SDS, as a grinding aid, is the production of particles with the same fineness or even finer at higher solids % which leads to an increase in the mill throughput. The smallest d80 was obtained at 60% solids, 60 min, pH 4, and 2 kg t−1 of SDS.
Invasion of fluids into porous media during drilling can lead to irreparable damage and reduced well productivity. Hence, minimizing the filtration loss of the drilling fluid into the formation is very important. The stability of colloidal suspensions plays a crucial role in controlling the interfacial forces and consequently on minimizing the filtration. The zeta potential is an indicator of the stability of colloids with respect to their electrostatic interactions. In this study, the rheological properties of bentonite suspensions are investigated with and without additives. The starch and CMC were used as additives to enhance the rheological properties of bentonite. The effects of these additives on the drilling fluid filtration were examined. Zeta-potential, viscosity, gel strength and yield point were measured to characterize the extent to which control of the filtration loss of the drilling fluids can be achieved. The zeta-potential and the amount of filtration loss of water-bentonite suspensions were correlated. Finally, the results showed that the addition of either starch or carboxymethyl cellulose (CMC) enhances the filtration properties of water-bentonite suspensions.
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