HWK 6 Solution-1

# HWK 6 Solution-1 - PGE 430 Drilling Homework 6 Solution Due...

This preview shows pages 1–2. Sign up to view the full content.

Homework 6 Solution Due at lecture time: Oct. 21 (1) Please select the sizes of the Production casing The size of a 2 3/8”, EUE 8rnd collar is 3.063”. 3.063 1 0.13 2 3.063 3.86" o o D D - = = This calculation is worth +0.25 pts From Table 7.6 in the text the smallest casing with this minimum ID is 4 ½” OD. This choice is worth +0.25 pts Production Hole – From Table 7.7, the bit should be a 6 ¼”. Other bits shown in Table 7.7 are 6” and 6 1/8”. Accept these for full credit of +0.5 pts. NOTE: the student should note that we do not achieve a 1” cement sheath desirable for production casing around the collar of the 4 ½” casing with any of these bits. Therefore, the largest possible is the best choice. Note the special comments for the intermediate casing. Intermediate casing 6.875 1 0.13 2 6.875 8.66" o o D D - = = This calculation is worth +0.25 pts From Table 7.6 the smallest casing with this minimum ID is 9 5/8” OD. +0.25 pts The student should note in this step that the drill collar size is actually larger than the bit chosen from Table 7.7 and this obviously is not possible. The bit must be selected to be larger than the 6 7/8” drill collar which also allows us to use a bit now that is large enough to provide the 1” thickness around the 4 ½” casing. The standard US size for this is a 7 7/8” bit. Intermediate Hole From Table 7.7 the bit size is 12 ¼” +0.5 pts Note that the other bit choice in Table 7.7 is a 14 ¾” bit. This causes the surface casing diameter to be un-necessarily large. The 12 ¼” bit gives adequate cement sheath for intermediate casing. Surface Casing

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 02/13/2012 for the course PGE 430 taught by Professor Chenevert during the Spring '06 term at University of Texas at Austin.

### Page1 / 5

HWK 6 Solution-1 - PGE 430 Drilling Homework 6 Solution Due...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online