Fig. 4.45 shows a one-arm device caliper and a three-arm bow-spring device caliper obtained in the...

 

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Fig. 4.45 shows a one-arm device caliper and a three-arm bow-spring device caliper obtained in the same borehole in- terval. Explain the disagreement between the two logs in both the thick and thin zones. HOLE DIAMETER (inches) 5 10 15 11700 11800 Km Rm mr constant in Eq. 4.18 n = saturation exponent ė = heat flow rate, cal/sec = mud resistivity, 2-m = mudcake resistivity, 2 m So Sor = = = = coefficient that varies with mud weight Rmc Rm mud-filtrate resistivity, m R₁ resistivity of uninvaded zone, N.m = Rw = formation water resistivity, 2.m Rxo resistivity of flushed zone, 2 m oil saturation, fraction = U = = To Calipers 111 Fig. 4.45-Caliper log of Problem 4.1. = Sw water saturation, fraction W AS variation in water saturation Sxo saturation of mud filtrate in flushed zone, fraction t = mud circulation time, hours St time since mud circulation stopped, hours T = temperature, °F Ta Tf Tm mud temperature, F Ts V. I Arm Pad 3 Arm Bow Spring residual oil saturation, fraction mean annual temperature of air, °F = static formation temperature, F = temperature near surface, °F = mud filtrate volume, cm³ mf p= density, g/cm³ = Pm mud density, lbm/gal þ = porosity, fraction Fig. 4.45 shows a one-arm device caliper and a three-arm bow-spring device caliper obtained in the same borehole in- terval. Explain the disagreement between the two logs in both the thick and thin zones. HOLE DIAMETER (inches) 5 10 15 11700 11800 Km Rm mr constant in Eq. 4.18 n = saturation exponent ė = heat flow rate, cal/sec = mud resistivity, 2-m = mudcake resistivity, 2 m So Sor = = = = coefficient that varies with mud weight Rmc Rm mud-filtrate resistivity, m R₁ resistivity of uninvaded zone, N.m = Rw = formation water resistivity, 2.m Rxo resistivity of flushed zone, 2 m oil saturation, fraction = U = = To Calipers 111 Fig. 4.45-Caliper log of Problem 4.1. = Sw water saturation, fraction W AS variation in water saturation Sxo saturation of mud filtrate in flushed zone, fraction t = mud circulation time, hours St time since mud circulation stopped, hours T = temperature, °F Ta Tf Tm mud temperature, F Ts V. I Arm Pad 3 Arm Bow Spring residual oil saturation, fraction mean annual temperature of air, °F = static formation temperature, F = temperature near surface, °F = mud filtrate volume, cm³ mf p= density, g/cm³ = Pm mud density, lbm/gal þ = porosity, fraction

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