Study Guides (390,000)
US (220,000)
LSU (10,000)
PETE (60)
All (3)
Final

4045hw5 PpExam


Department
Petroleum Engineering
Course Code
PETE 4045
Professor
All
Study Guide
Final

This preview shows page 1. to view the full 5 pages of the document.
PETE 4045 Name: ________________________________
1
PETROLEUM ENGINEERING 4045 DRILLING ENGINEERING
HOMEWORK ASSIGNMENT #5 -- FALL 2012
Remember, these homework questions provide the basis for future test questions.
Questions marked with * were used as the basis for questions on tests prior years.
Formation Pore Pressure
1) *Write an explanation in your own words of how porosity changes with depth for
both normally compacted, normally pressured sediments and abnormally pressured
sediments. Use complete sentences. Draw a sketch of expected porosity versus depth
trends and refer to the sketch in your explanation.*
2) *List the four major causes of abnormal formation pressures: *
a)
b)
c)
d)
3) *Calculate the pore pressure gradient expressed as an equivalent mud weight (lb/gal
eq) for each circled point on the attached plot b. from the text book. Use your
calculations to make a plot of pore pressure versus depth. Assume that in this area
the normal pressure gradient .465 psi/ft and that the overburden gradient is 1.0 psi/ft.*
You're Reading a Preview

Unlock to view full version

Only page 1 are available for preview. Some parts have been intentionally blurred.

PETE 4045 Name: ________________________________
2
4) Write a paragraph using complete sentences to explain why a pore pressure
interpretation based on porosity might not give an accurate prediction of the pressure
in a given permeable formation within the section where the interpretation was
performed. (Think about the causes of abnormal pressure before writing.)
5) *List four parameters that could potentially be measured during seismic, drilling or
logging operations that can be used to indicate formation pressures in shales. *
(a) __________________________
(b) __________________________
(c) __________________________
(d) __________________________
6) You are drilling a development well to a gas sand that you expect to penetrate at 8600
ft TVD.
a) *Calculate the pore pressure at the top of the gas sand (expressed in lb/gal eq) in
this development well knowing that a kick was taken in the same sand at a depth
of 9100 ft TVD in an adjacent well with 9.3 lb/gal mud and the shut-in drillpipe
pressure was 470 psi. (Assume a gas gradient of .1 psi/ft.) *
b) What mud weight would be required to provide a 200 psi overbalance when
drilling through the gas sand in the new well?
You're Reading a Preview

Unlock to view full version