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• W1995270602 abstract "SPE Members Abstract The paper describes an experimental approach to study the formation damage induced by drilling muds in oil bearing formations. This approach includes i) static and dynamic invasion tests on long core samples performed either under CT Scanning or with specific equipment allowing pressure measurements along the core sample, and ii) characterization of both external and internal mud cakes by means of Cryo-SEM examinations. A series of seven water-based mud invasion experiments has been conducted on high permeability clayey sandstones. The amount and the extent of formation damage have been quantified. The results show that global oil return permeabilities vary from 44% to 90% of initial permeability depending on oil viscosity and overbalance pressure. Hysteresis of saturations due to retention of invaded aqueous filtrate was always observed, up to 17 saturation units. This induced an adverse relative permeability effect which may significantly contribute to oil permeability impairment. Introduction During drilling it is a common practice to maintain a positive pressure difference between the drilling fluid and the formation. Overbalanced drilling causes the mud particles and mud filtrate to invade the formation. Thus, the near wellbore formation is generally altered and this alteration induces strong detrimental effects on well productivity. To determine the nature and the extent of the formation damage due to drilling/completion operations, the best way is to perform laboratory experiments which duplicate as close as possible the actual borehole conditions. A lot of experimental studies have been conducted in the past in order to simulate the hydraulic and physico-chemical processes which occur during drilling and to quantify the associated formation damage. But most of these studies have been conducted on short core samples (1-2 inches long) and under conditions which were not always representative of oil or gas bearing formations. According to the State of the Art the two main potential sources of damage due to water based muds are mud particles plugging in the near wellbore and mud filtrate invasion, specially if the filtrate is incompatible with the rock-fluid system. Jiao and Sharma have presented an interesting study to determine the formation damage induced by water based muds on long Berea core samples (8 inches) under various experimental conditions. Among their results, they have observed that the first damaging process is due to mud particles invasion which mainly occurs during the initial spurt loss. They showed that the depth of invasion was strongly dependent on mud composition. The second mechanism of damaging was caused by fine release and migration. The results of Jiao and Sharma showed that this mechanism can be quite significant if the salt concentration of the mud filtrate is less than the critical salt concentration required to prevent fines migration. The presence of an oil phase within the core was also studied by Jiao and Sharma. P. 117" @default.
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• W1995270602 date "1995-05-15" @default.
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• W1995270602 title "An Integrated Experimental Approach for Evaluating Formation Damage Due to Drilling and Completion Fluids." @default.
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• W1995270602 doi "https://doi.org/10.2118/30089-ms" @default.
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