Question: It is planned to drill a well by using oil-based mud. During the drilling operation, the adsorption (osmotic) pressure of 11950 psi is estimated to

It is planned to drill a well by using oil-based mud. During the drilling operation, the adsorption (osmotic) pressure of 11950 psi is estimated to provide the stability of a shale zone whose temperature of 45C according to the data obtained from the offset wells existing wellbores that may be used as a guide for planning a well (Assume that the freshwater is used in the preparation of the oil-based mud).

a) Calculate the activity of the shale.

b)If the amount of CaCl2 salt (in lbm) that should be added to 1 bbl of water is 176.3 lbm/bbl, calculate the CaCl2 salinity (in percent by weight) of the water phase in the drilling fluid required to balance the activity of the shale zone.

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