Name: _____________________________
Petroleum Engineering 324 Well Performance Reading Task No.
1
Spring 2007 Due: 05 February 2007
Handout Paper: "Application of the Back-Pressure Method for
Determining Absolute Open Flows of
Large Gas Wells" by M.A. Schellhardt (1944) 1. Explain the
motivation of the author for writing this report. 2. How did
Rawlins and Schellhardt obtain the relationship to determine the
deliverability of the gas wells?
Explain if this relationship is applicable to oil wells (or
not). 3. List the primary factors for the sources of error in
calculated (bottomhole) pressures. Explain how these
factors affect back-pressure calculations. 4. In the
deliverability equation, state the definition of the "n" parameter?
How is this parameter deter-
mined? Explain any physical conditions that the n-parameter
represents. 5. State (and explain) the procedure for obtaining the
absolute open flow using the back-pressure data. Lecture Material:
Objectives of Well Test Analysis Introduction to Porosity and
Permeability Concepts Properties of Reservoir Fluids
1. Explain the apparent relationship between porosity and
permeability. Discuss if there is/are any univer-sal
concept/correlation(s) that can be used to describe
porosity-permeability relations. List the factors which affect
permeability.
2. Discuss the importance/relevance of "petrophysics" in terms
of well performance. 3. Sketch the P-T diagrams for each reservoir
fluids (black oil, volatile oil, wet gas, retrograde gas and
dry
gas) include the "typical" pressure path of depletion for each
reservoir fluid. Explain the roles that phase behavior (or PVT)
concepts play in well performance?
4. Describe the PVT properties for the types of reservoir
fluids: (sketch each as a function of pressure) Black-oil: (p/pb
> 0) Bo, Rso, u, co Solution gas drive: (p/pb < 0) Bo, Rso,
u, co Dry gas: z, g, cg
5. What are the objectives of well test/production data
analysis?
_____________________________________________________________________________________
Required:
You are to prepare a typed report for this reading task
addressing all points in each subtask as assigned. Plots or
sketches can be made by hand, and can be inserted into the report
where appropriate. Failure to address all tasks will result in
penalties.
This page and the "Honor Code" coversheet are required as
coversheets to your report for this read task.
_____________________________________________________________________________________
Petroleum Engineering 324 Well Performance Reading Task No.
1
Spring 2007 Due: 05 February 2007
Assignment Coversheet
(This sheet must be included with your work submission)
Required Academic Integrity Statement: (Texas A&M University
Policy Statement)
Academic Integrity Statement
All syllabi shall contain a section that states the Aggie Honor
Code and refers the student to the Honor Council Rules and
Procedures on the web.
Aggie Honor Code "An Aggie does not lie, cheat, or steal or
tolerate those who do."
Upon accepting admission to Texas A&M University, a student
immediately assumes a commitment to uphold the Honor Code, to
accept responsibility for learning and to follow the philosophy and
rules of the Honor System. Students will be required to state their
commitment on examinations, research papers, and other academic
work. Ignorance of the rules does not exclude any member of the
Texas A&M University community from the requirements or the
processes of the Honor System. For additional information please
visit: www.tamu.edu/aggiehonor/
On all course work, assignments, and examinations at Texas
A&M University, the following Honor Pledge shall be preprinted
and signed by the student:
"On my honor, as an Aggie, I have neither given nor received
unauthorized aid on this academic work."
Aggie Code of Honor:
An Aggie does not lie, cheat, or steal or tolerate those who
do.
Required Academic Integrity Statement:
"On my honor, as an Aggie, I have neither given nor received
unauthorized aid on this academic work."
_______________________________ your name printed
_______________________________ your signature
Coursework Copyright Statement: (Texas A&M University Policy
Statement)
The handouts used in this course are copyrighted. By "handouts,"
this means all materials generated for this class, which include
but are not limited to syllabi, quizzes, exams, lab problems,
in-class materials, review sheets, and additional problem sets.
Because these materials are copyrighted, you do not have the right
to copy them, unless you are expressly granted permission.
As commonly defined, plagiarism consists of passing off as ones
own the ideas, words, writings, etc., that belong to another. In
accordance with this definition, you are committing plagiarism if
you copy the work of another person and turn it in as your own,
even if you should have the permission of that person. Plagiarism
is one of the worst academic sins, for the plagiarist destroys the
trust among colleagues without which research cannot be safely
communicated.
If you have any questions about plagiarism and/or copying,
please consult the latest issue of the Texas A&M University
Student Rules, under the section "Scholastic Dishonesty."