PETE 4045 – Drilling Engineering
Exam 2 – Fall 2017
Instructor: Dr. Mauricio Almeida
Student
... [Show More] Name:_________________________________LSUID:89-__________
Student Listing Number:_________
Exam Type: 001
General Instructions:
This is a closed book exam.
Besides you calculator, electronic devices of any kind (mobile phones, iPods, pocket PC’s,
etc) are prohibited.
Do not detach any sheet from your exam.
For multiple choice questions, clearly mark your single answer. More than one answer
marked will imply in no grade (zero) for the question.
Questions 11 to 14 – Partial Credit Given:
You must show your calculations and place the final answer in the box to receive full credit
for your work. Use only the space allotted at the respective page to solve these questions.
Failure to indicate the units in your calculation will result in losing points.
Make and state clearly any assumptions that you believe are necessary.
10/25/2017
Craft & Hawkins Petroleum Engineering Department
Louisiana State University
1
1) Formations at different depths having the same porosity have also the same: (5 points)
A. Overburden stress
B. Grain density
C. Effective vertical stress
D. Pore pressure
E. None of the above
2) A leak-off test is performed after ______________ to determine __________. (5 points)
A. Cementing the casing / fracture pressure.
B. Tripping out of the hole / pore pressure
C. Cementing the casing / pore pressure
D. Drilling to next casing depth / fracture pressure.
E. Circulating for cement job / fracture pressure.
3) In an offshore wellhead, the production and intermediate casing are hung on the: (5 points)
A. Low Pressure Housing
B. Permanent Base
C. Bell Nipple
D. High Pressure Housing
E. BOP
4) What is the main cause of abnormal formation pressure due to cement leak behind the casing:
(5 points)
A. Compaction effects
B. Differential density effects
C. Diagenetic effects
D. Fluid migration effects
E. Ballooning Effect
5) What is the effect of water depth on the operational drilling window when compared to an
onshore well drilled to the same depth? (5 points)
A. It increases the Effective Vertical stress of the formation with depth.
B. It enlarges the operational window minimizing the risk of kicks.
C. It reduces the area in the plot between the Formation Pore pressure and the Fracture
Pressure curves.
D. Do not affect the operational window since it is only water.
E. It creates a longer transition between the normal to abnormal pressure zones.
2
6) In regards of the force required to free differential stuck pipe, which of the parameters listed
below are affected by the Drill Collar OD and mud weight, respectively: (5 points)
A. Pressure differential (wellbore minus permeable formation pressures) / mud cake
thickness.
B. Effective area of contact with the mud cake / pore pressure.
C. Thickness of mud cake / coefficient of friction (between the pipe and the borehole
wall)
D. Effective area of contact with the mud cake / Pressure differential (wellbore minus
permeable formation pressures).
E. Coefficient of friction (between the pipe and the borehole wall) / overburden load.
7) In the MPD webinar you were exposed to a few plots, like the ones below. What is being
illustrated here? (3 points)
A. Field test of an MPD well
Offshore Norway that went
perfect.
B. How the upgraded MPD
choke controller actuates in
the well.
C. An example of bad
practices regarding MDP
operations and procedures.
D. The effect of the new RCD
rubber seal presented in the
lecture.
E. A comparison between
conventional and MPD
operation.
8) The main objective to be achieve when DGD is applied is: (3 points)
A. Save money with drilling fluid.
B. Drill the well with less casing sections.
C. Reduce the chance of taking an influx during drilling.
D. Pump the mud back to the rig when drilling without the BOP.
E. Have a closed system to circulate fluid, controlling the bottom hole pressure. [Show Less]
