I need help with understanding what is required for me to do and how do I do it step by step.
Homework 1:
The plots should be depth (from surface to TD from the top down) on the "y-axis" and pressure (both positive and negative) on the "x-axis". Remember that the independent variable is on the "y-axis" which is different than what "Excel" or other spreadsheets expect. A 13-3/8" intermediate casing string is being run and set in a 17.5 inch open hole with 2094 ppf surface casing set at 575 feet.
Drilling Mud:
11.2 ppg
OD (inches)
ID (inches)
WPF (Ibf/ft)
Grade
Conn
From (feet)
To (feet)
13 3/8
12,515
61
K55
STC
0
716
13 3/8
12,615
54.5
K55
STC
716
1,938
12.2 ppg
K55
STC
Spacer
13-3/8
12,515
61
1,938
2,760
13 3/8
12,415
68
C75
STC
2,760
4,000
You just finished a cement job. Given the following data, determine:
Displacement 8.33 ppg 14.15 ppg Lead Cement
Spacer is 70 bbls of a 13.2 ppg chemical wash Lead cement is 1008 ft3 at 14.15 ppg (all of this cement is in the annulus) Tail cement is 402.5 ft3 at 15.8 ppg (note: part of the tail cement is in the 13-3/8' casing and some of it is in the annulus.) There is a float collar one joint from the shoe (40 foot long) Original mud weight is 11.2 ppg Displacement is fresh water to the float collar. Pressure inside the casing at the surface is 987 psi.
1. Draw a wellbore diagram with the correct locations (depths) for the internal and external fluids. You can find the wellbore diagram below.
2. Determine the equations as a function of depth that govern the exterior and interior pressure profiles.
3. Plot the interior and exterior pressure profiles versus TVD for this situation. Use exterior pressure on the negative side of the axis and the interior pressure on the positive side of the axis.
