Effect of salinity on the density of brine 5. A black oil reservoir is producing

Question

Effect of salinity on the density of brine 5. A black oil reservoir is producing water with the oil. The reservoir is 8,421 feet subsea. Initial conditions are 165°F and 3,916 psig. The black oil has a bubble-point pressure of 3,161 psig at 165°F. The reservoir produces 44.7°API stock-tank oil and 0.847 specific gravity gas at 1,345 SCFISTB. The composition of the produced water is given as follows. Total dissolved solids (TDS) is 68,030 ppm. Convert the analysis (every ions) to milligram per liter. Estimate the formation volume factor of brine at 3,161 psig and 165°F (10 pts). '72 lon concentratlon lon concentration, Catior Sodium Calcium 23.806 1,906 41.312 283 Iron Barium Note: The relationship between milligrams per liter and Parts per million: Cmgli -Pw x Cppm p, is in gcc at standard conditions. weight percent solids (wt%) Cw-Cppr.x 10-4. B.-(1+??.?1+4%) ?? «T as a function ofreservoir temperature ?1wp as a function of Pesenvolr and Tneserveir. conditions. Weight percent solids (wt%) Cw-CppmX 104

Explanation / Answer

From the relation Cmg/l=?w×Cppm

Specific Gravity=?w/?water at same temp.

0.847*1.1=0.9317=?w

Using formula's

Sodium=21993.7102

Calcium=1775.8202

Magnesium=350.3192

Barium=0

Iron=276.7149

Chloride=38490.3904

Bicarbonate=47.98255

Sulfate=263.6711

Carbonate=0

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