Drilling Engineering
1.a 815 bbls fresh water mud composed of barite and bentonite of ratio 0.67. the volume of bentonite and barite is 39 bbls. a 585 bbls of 8.69 ib/gal density salt water should be added. the resulting mud is used to drill a well of 9 ¾ in. diameter (capacity = 0.07 bblt.) at penetration rate of 21.7 fumin. the density of drilled cuttings is 20.4 ib/gal. pumping rate is 872 gal/min. consider the effect of cuttings, calculate the drilling fluid density in the annulus
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After 8.0 inches casing string had been set at 10,000 ft, drilling will be continued with 5” (4.276” ID), 19.5 lb/ft, X95 Range 2 drill pipe down to 13,000 ft depth formation with gradient of 0.48 psi/ft using 10.8 ppg mud. While drilling, suddenly the drill pipe stuck and drillers try to free the drill pipe with 100,000 lbs pulled. At the second pulled of 157,000 lbs, there is 3.5 ft drill pi
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