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 ft7000-80006000-70005000-60004000-5000Average Diameter inch91/891/495/893/8 Calculate the volume of cement slurry required using the caliper measurements and 15% of excess, andWithout 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.

Calculating the annular volume : V=d21029.4×L bbld=Diameter of hole in inches L=Length of hole in ft

Answered: A 7 in – 17 lb/ft (6.538in ID) casing…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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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.

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