Specific gravity separation

A wet gas reservoir produces 170,516 scf/STB of 0.646 specific gravity separator gas, 492 scf/STB of 1.184 specific gravity stock- -tank gas, and 64.7°API stock-tank liquid. Calculate the specific gravity of the reservoir gas. 

EXAMPLE 9-3 A reservoir is producing 40.7°API stock-tank oil and 0.786 specific gravity separator gas. Separator gas-oil ratio appears to be constant at 676 scf/STB. Separator conditions are 100 psig and 75°F. Estimate solution gas-oil ratio at the bubble point for this black oil. 

An oil well is producing 930 scf/STB of 0.742 specific gravity separator gas and 40.8°API stock-tank oil. Separator conditions are 100 psig and 90°F. The well has just been completed reservoir pressure is believed to be above bubble-point pressure. Estimate a value of solution gas oil ratio for use at and above bubble-point pressure. 

Coal washability determination of the theoretical limits for the removal of mineral impurities from coal by beneficiation processes that rely on specific gravity separation (ASTM D-4371). 

Procedure for the mineralogical subdivision of soil separates by means of heavy liquid specific gravity separations. Proc. Soil Set. Soc. America, 2 109-114. 

Sand processes employ suspensions, often unstable, of sand in liquids whose effectiveness can be maintained only by high rates of agitation and recirculation. Specific gravity separations up to 1.90 are obtainable, but specific gravities of 1.45-1.60 are more commonly employed for... 

Volk, N. J, 1933. Formation of muscovite in soils and refinements in specific gravity separations. Am.J. Sci. 26 114-129. 

Gravity concentration, ie, the separation of ore from gangue based on the differences in specific gravities, using jigs, heavy—medium separators, or spiral concentrators for example, is appHcable for lead ores. However, the predominant beneficiation technique used in modem plants is the bubble or froth flotation (qv) process (4,5). 

Although the size separation/classification methods are adequate in some cases to produce a final saleable mineral product, in a vast majority of cases these produce Httle separation of valuable minerals from gangue. Minerals can be separated from one another based on both physical and chemical properties (Fig. 8). Physical properties utilized in concentration include specific gravity, magnetic susceptibility, electrical conductivity, color, surface reflectance, and radioactivity level. Among the chemical properties, those of particle surfaces have been exploited in physico-chemical concentration methods such as flotation and flocculation. The main objective of concentration is to separate the valuable minerals into a small, concentrated mass which can be treated further to produce final mineral products. In some cases, these methods also produce a saleable product, especially in the case of industrial minerals. 

Time is a critical variable because the magnetite settles if the mixture is held too long in a static condition. Use of hydrocyclones makes possible the separation in a fraction of a minute (21). These devices impart centrifugal force to the system, thereby permitting a separation to be made at a specific gravity less than that required in static, heavy-Hquid separations. 

Further upgrading of the potassium chloride content of the chloride salts recovered from the initial heavy-medium separation takes place in a second heavy-medium separation at a somewhat lower specific gravity than the first separation. Sodium chloride is discarded as a waste the enriched KCl fraction is sent to a flotation process where a final separation of KCl from NaCl is made. Mine-mn ore less than 1 mm that is not amenable to... 

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