HW. 2

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School

Oklahoma State University *

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Course

313

Subject

Mechanical Engineering

Date

Feb 20, 2024

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pdf

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2

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Assignment # 2 PETE 4313 Drilling and Well Completions Name: __________________________ Wellbore system and Hydrostatic Pressure Due: Feb 8, 05:00 pm | worth 50 points Include additional worksheets with calculations for partial credits in the event your final answer is not correct. 1. Calculate the hydrostatic pressure at the bottom of the fluid column for each case shown: The following questions (Q2 to Q9), are all related to the well profile provided below. A well has the following profile: Wellbore and Casing Total depth 16,400' (vertical well) 16'' Open Hole, Surface casing 13 3/8" OD and 12 3/7" ID of 68.00 lb/ft set at 2000'. 12.5'' Open Hole, Intermediate Casing 9 5/8"OD and ID of 8 2/3", 47 lb/ft, set at 8,458' 8.5'' Open Hole, Drilling liner 7" (6" ID) (Grade N-80) interval between 8,400' to 14,200' Open Hole, Bit diameter 5.5" Drillstring: 5" drill pipe 19.50 lb/ft nominal weight, (4.276" ID) surface to 8300'. 3 1/2 drill pipe 13.30 lb/ft nominal weight between 8,300' to 15,200'. (For the ID on the 3 1/2" drill pipe remember that the density of steel is 65.5 lb/gal) Drill collars, 4 3/4" OD, x 2 1/4" ID, 46.70 ppf, 15200' to TD. Surface mud system: 3 mud tanks, each 9' high, 7' wide, 36' long. With the entire drill string out of the hole: Mud level in tanks No. 1 & 2 is 72" of mud and tank No. 3 has 60" of mud (M.W: 11 ppg) 2. Calculate the total capacity of the surface mud system in bbl. 3. Calculate total mud volume in the three tanks in bbls.
4. Calculate the capacity in bbl/ft for each well section. 5. Calculate the total hole volume with the entire drill string out of the hole in bbl. 6. Calculate the displacement of the 5" drill pipe in bbl/ft. 7. Calculate the displacement of the complete drill string in bbl. 8. Calculate the total hole volume with the bit on the bottom in bbl. 9. Calculate the hydrostatic pressure at bottom of the hole (psi). 10. Calculate the pressure at the bottom of each well. 11. Calculate the equivalent density at 7000' depth of the following mixed fluid column.
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