Why is the initial drilling phase (surface section) critical?
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- Explain Why is the initial drilling phase (surface section) critical?
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- b) Describe the following drilling methods and give advantages and disadvantages of each: solid i. stem augerii. rotary washiii. coring.A 7 in – 17 lb/ft (6.538in ID) casing string is set at 8,000 ft deep in a 8 3/4 in hole. A height of 3,850 ft of cement is required in the annulus, and 60 ft of cement is left in the casing. Caliper measurements indicate the following average diameter: Well Depth ft 7000-8000 6000-7000 5000-6000 4000-5000 Average Diameter inch 91/8 91/4 95/8 93/8 Calculate the volume of cement slurry required using the caliper measurements and 15% of excess, and Without using the caliper measurement and 50% of excess. Calculate, for each case, the number of sacks of cement if the yield is 1.1 /sack.Define the functions of drilling mud?