The University of Louisiana Department of Petroleum Engineering

The
University of Louisiana
Department
of Petroleum Engineering
Drilling
Engineering, PETE 382

Term Project
DRILLING FLUIDS, VOLUMES,& TRIPPING JOBS

Synopsis:
Drilling fluid plays an important
role in any drilling activity. It is the
main controlling parameter in well control.
Its main function is to control the bottom hole pressure (BHP) and
stabilize the borehole. Therefore, it is
very important to properly design the mud to avoid any fluid loss or cause
formation damage.
This project aims at giving students
the opportunity to have a comprehensive idea of the overall activities and the
process related to mud use starting from mixing it up to tripping jobs. The product of this project (Excel sheet) can
be used as a tool to make any calculation related to the use of mud in any
drilling activity in the future. In
other words, you will be able to use the Excel sheet in your future jobs if you
ever get involved in any drilling activity.
Therefore, it is expected that students to do a comprehensive search in
the net, libraries, contacting oil companies to get the necessary information
required for the project execution. A
maximum of three students can work on the same project. Students must adhere to the project deadline. No project will be accepted after the
indicated due date. Therefore, it is
advisable to form your team and start immediately on the
project.

Project Objective:
The aim of this project is to develop
an Excel sheet that calculates the following for typical drilling fluid and
well configurations:
ü Required densities of drilling fluids
ü Rheological properties of a given mud
ü Volumes of typical wells, pump
pressure, output, and strokes,
ü Effect of tripping jobs on the
hydrostatic pressure.

Project Requirements:
You are expected to take your own mud
properties (i.e., measurements made in the lab) and select a typical well
configuration as well as the mud pump (use both duplex and triplex pumps) to
calculate the following:
1. Average mud weight (ppg) when mixing
two densities
2. Required fluid volumes of two unknown
fluid densities to obtain desired final volume and density
3. Use any of your lab data to
calculate:
a. Plastic viscosity
b. Yield point
4. Amount of barite (100 lb/sx) needed
to weight-up the mud
5. Amount of water (bbls) needed to
dilute the mud
6. Total volume in the hole when the
drillstring is completely out of the hole.
7. Mud volume in the drillstring of a
typical well (select your own drillstring sizes)
8. Mud volume in the annulus of a
typical well
9. Buoyancy factor
10. Hook load when drillstring is fully
submerged in the well.
11. Number of pump strokes from surface
to bit
12. Number of pump strokes from bit to
surface
13. Total number of pump strokes
14. Total circulation time
15. The drop in mud level for a specified
number of stands pulled
a. Dry pull out
b. Wet pull out
16. The corresponding pressure drop for
a. Dry pull out
b. Wet pull out
17. If you are drilling in a field with a
the formation pressure gradient of 0.55 psi/ft, indicate in your program if a
kick takes place or not depending on the hole depth and mud density. Take a pressure of 150 psi as a safety margin
(i.e., BHP + 150 = formation pressure).

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Recommendations:
·
For
calculations 11 – 14, you need to select standard sizes of duplex and triplex
pumps and perform the calculations.
·
It
will be nice if you can draw a schematic diagram of the selected well with the
drillistring showing the drop of the mud level, its corresponding pressure drop
as well as the bottom hole pressure during tripping jobs.

Project Execution:
You are required to do the following:
1. Search through the net or refer to
textbooks, handbooks, standards, and lecture notes to get the required
information for the above calculations.
2. Write down the required equation for
each calculation used in Excel and include them in an appendix of your report.
3. Write a short description of how any
of the equations can be used and what it is used for.
4.
Develop
an EXCEL sheet that computes all the required parameters listed above (1 – 16)

Project Report:
Your report should
include the following:
1.
Introduction
2.
Theory used (all the equations used)
3.
Excel sheet (soft copy)
4.
Soft and hard copies of the report
5.
Include any references used

Grading Scheme:
Your project
will assessed based on the following:
ü
Project organization
ü
Organization and Neatness of Excel sheet
ü
Contents (diagrams, illustrations etc…)
ü
Creativity

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