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## PNG 450-Drilling Design

Final Exam
Spring Semester 2010
(total 100 points)
1. (5 points) The highest collapse requirement for a casing string is at
Top ofthe casing close to wellhead
The middle
Bottom of the casing

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## 2. (5 points) The highest tension requirement for a casing string is at

(9 top of the casing close to wellhead
the middle
bottom of the casing

mcrease
decrease
not change

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## 7. (15 points) Calculated and de given:

R = 25 ft/hr
N=80RPM
w = 30,000 lbf
Da= 9 7/8 in
Mud weight= 12lbm/gallon
Normal pressure gradient of 0.5 psilft
Poison ratio = 0.4
Depth= 16,000 ft
Then based on the fi ure below, calculate formation ressure from Ben Eaton's method.

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8. (15 points) The same as question 7, then calculate the fracture gradient from Hubbert &
Willis method and Ben Eaton method. Based on your calculations, recommend a drilling
fluid system (mud weight) to drill through the formation at 16,000 ft.

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9. (25 points) A common problem of drilling oil and gas wells in deep water is the narrow
window between the formation pore pressure and fracture pressure. Figure below shows a
typical case from offshore Ghana (Hradecky and Postler, 2004).
Please identify how many casing runs you would recommend from 8,000 ft- 20, 000 ft
for this well if an intermediate casing has been set from surface to 8,000 ft. And why? Is
it safe to run 5.5", 23#/ft, PllO with long thread as production casing from surface (0 ft)
all the way to 20,000 ft.
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10. (15 points) Design a directional well with the following restrictions: -..........,...L...r-L---Total horizontal departure
= 3,500 ft
True vertical depth (TVD)
= 10,500 ft
Depth to kickoff point (KOP) = 2,500 ft
= 2 deg/100 ft
Rate of build ofhole angle
Type I well (build and hold)
Calculate MD and maximum inclination angel.

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10. (20 points) Design a directional well #2 to start from surface location (A) and hit the
reservoir target (B) under the lake as in the layout below.

## Horizontal distance between A and B = 2,655 ft

True vertical depth (TVD)
= 11,500 ft
Depth to kickoff point (KOP)
= 2,400 ft
Rate of build of hole angle
= 3 deg/100 ft
Azimuth Angle
= S82E
Type I well (build and hold)
Calculate MD to the end of build, total MD, and maximum inclination angel.

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Page 1 of 8

## PNG 450-Drilling Design

Final Exam
Spring Semester 2011
(Total 100 points)

1. (5 points) To avoid buckling of drill strings, an engineer should design the string and
make the neutral point fall inside
Kelly
Drill pipes
0 Drill collars
Drill bit
Derrick

## 2. (5 points) The highest collapse requirement for a casing string is at

Top ofthe casing close to wellhead
The middle
Bottom of the casing

## 3. (5 points) The highest tension requirement for a casing string is at

@ top of the casing close to wellhead
the middle
/
\
bottom of the

4. (5 points) The collapse strength of casing string will _ _ _ with increasing tension:
mcrease
decrease
not change

## 5. (5 points) Two main types of rotary drilling bits are

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6. (5 points) What are the three main types of cementing process? Explain the purpose of
each briefly.

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7. (25 points) In January 2011, a Range engineer tested the Marcellus shale formation and
found a pore pressure gradient of0.83 psi/ft. We also know the formation depth is 8,000
ft, overburden is 1.1 psi/ft based on a density log and poison ratio is 0.35 based on a sonic
log. Please calculate the fracture gradient from Hubbert & Willis method and Ben Eaton
method. Based on your calculations, recommend a drilling fluid system (mud weight) to
drill through this Marcellus formation.
The company plans to use 5.5", 23#/ft, N80 with long thread as production casing from
surface all the way to 8,000 ft. Will the casing fail at 5,000 ft?

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Page 4 of 8 .

## 8. (15 points) Calculate d and de given:

R = 30 ftlhr
N=80RPM
w = 30,00QJbf
Ds = 9 7/8 in
Mud weight = 10 Ibm/gallon
Normal pressure gradient of 0.465 psi/ft
Poison ratio = 0.4
Depth = 10,000 ft
Then based on the figure below, calculate formation pressure from Eaton's method.
Would you expect kicks if drillin sto s?

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Page 6 of 8

9. (10 points) A common problem of drilling oil and gas wells ,in deep water is the narrow
window between the formation pore pressure and fracture pressure. Figure below shows a
typical case from offshore Ghana (Hradecky and Postler, 2004).
you would recommend from 8,000 ft- 20, 000 ft if
an intermediate casing has been set from surface to 8,000 ft. And why?
-Pore Pressure

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Page 7 of 8

10. (20 points) Design a directional well #2 to start from surface location (A) and hit the
reservoir target (B) under the lake as in the layout below.
'

## Horizontal distance between A and B = 2,655 ft

True vertical depth (TVD)
= 11,500 ft
Depth to kickoff point (KOP)
::;: 2,400 ft
Rate of build of hole angle
= 3 deg/100 ft
Azimuth Angle
= S82E
Type I well (build and hold)
Calculate MD to the end of build, total MD, and maximum inclination angel.

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