Oil reservoirs below ground frequently are in contact with underground water, an

Question

Oil reservoirs below ground frequently are in contact with underground water, and in connection with an oil drilling operation. Suppose you need to calculate the solubility of water in a heavy oil at the underground conditions: temperature, 140 degree C; pressure, 410 bar. Experiments at 140 degree C and 1 bar indicate that the solubility of steam in the oil is, x_1 = 3.5 times 10^-3, where x_1 is the mole fraction of steam. Assume Henry's Law in the form of f_1 = H (T)x_1, where H(T) is a constant, dependent only on the temperature and f_1 is the fugacity of H_2 O. Also assume that the vapor pressure of the oil is negligible at 140 degree C. Use steam table for data needed for H_2 O.

Explanation / Answer

From the releationship pv= nRT. We can determine the mole fraction of water vapour at 140 degree centigrade and a pressure of 410 bar .Now by determining the fugacity of water vapour under above condition of temperature and pressure and by comparing the fugacity of water vapour at 140 degree centigrade and 1 bar pressure and by making use of Henry equation we can determine the solubility of water vapour at 140 degree centigrade and 410 bar vapour pressure. By fugacity we mean raito of real pressure to ideal pressure v

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