At the time of logging, the resistivity of a 10-lbm/gal drill- ing mud is measured with...
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At the time of logging, the resistivity of a 10-lbm/gal drill- ing mud is measured with an instrument on the surface. A value of 1.52 2-meter is obtained at a temperature of 90 F. a. What is the apparent salinity of the mud? b. What is the estimated mud resistivity at a depth of 8,600 ft in the hole where the formation temperature is 180°F? c. Estimate the resistivities of the mud filtrate at 90 and 180°F. d. Can you justify the statistical approximation for predomi- nantly NaCl muds: Rmf=0.75Rm? e. Estimate the resistivity of the mudcake at 180 F. f. Can you justify the statistical approximation for predominately NaCI muds: Rme =1.5R,? %3D At the time of logging, the resistivity of a 10-lbm/gal drill- ing mud is measured with an instrument on the surface. A value of 1.52 2-meter is obtained at a temperature of 90 F. a. What is the apparent salinity of the mud? b. What is the estimated mud resistivity at a depth of 8,600 ft in the hole where the formation temperature is 180°F? c. Estimate the resistivities of the mud filtrate at 90 and 180°F. d. Can you justify the statistical approximation for predomi- nantly NaCl muds: Rmf=0.75Rm? e. Estimate the resistivity of the mudcake at 180 F. f. Can you justify the statistical approximation for predominately NaCI muds: Rme =1.5R,? %3D
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