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PNG 450 final solutions psu
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/ I Name: Page 1 of 5
1(15 fell Gr.b; Je
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
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
/ 3. (5 points) The collapse strength of casing string will ___ with increasing tension: mcrease 0 decrease not change
4. (5 points) Cutter of drag bits can be made from: Steel
Gold
5. (5 points) Two main types of rotary drilling bits are Droa' b , h and Ra>l ,'"(5 c,,th:r. bit>
6. (5 points) Please classify a drill bit with IADC code of 647H: ______ _
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 Overburden gradient= 1.0 psi/ft Poison ratio = 0.4 Depth= 16,000 ft
Page 2 of 5
Then based on the fi ure below, calculate formation ressure from Ben Eaton's method.
l
116,000
,
\ \ \ ____ , ' : \ . '\ .
Q 3
Page 3 of 5
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.
d '' : 11 ,c.. }-{ tAtb< f r 0' vv --' rM,fl ,_ ( 1 + 2- JD)
- )..- { \ f 2 "'-? ) s
(fv'. ,. X -: .' ( I I J' ) r - , -:. D
1 (\t-'S) 71? (5 1
'1-'
"":.\::_!.-{ 42 j_b 1 \ --- ,
Page 4 of 5
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. No J 8v1 LJ / 5 _ cefll7) f> . . Of / l< .r a,
- Pore Pressure -Fracture Gradient n s (...,_.er-
114000
6 7 8 9 10 11 12 13 14 15 16 Equivalent Mud Welght,ppg
Page 5 of 5
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 Rate of build ofhole angle = 2 deg/100 ft Type I well (build and hold) Calculate MD and maximum inclination angel.
- \ - \ -- \-----J) '"' \ao lJeo ., -
iD,..y ? (1:\ t>,) - }r.? >(Du-b.)' 2((, fr-JY4 -- ?J. 4 5" ( ll_ fr(,?-) ,.. l "!
;Jb&!;IJ
d. -- 2;:;773> _ -:. ]J..2.\.
L.. ,., ("\...., ? "'-....\ d .:;., "' '-L.J ::: .) J. .. ?- l - I
2-?o ;) r 2 2>'-l.f. ?Cj ( ?.f. I.{ ? ) 1- 74 a,'?_ 61./ l
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.
- --------
/ [Name: PNG 450-Drilling Design
Final Exam Spring Semester 2011
(Total 100 points)
Page 1 of 8
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 6 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 G decrease not change
5. (5 points) Two main types of rotary drilling bits are 1'N C1dlvr b/ 1r
/ //
/ ;
Page 2 of 8
6. (5 points) What are the three main types of cementing process? Explain the purpose of each briefly.
) ,.. fr,rM' rj Cerr t{li f,"f
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?
g e r. cl " F -- ( ? __ f ) (__E- \ 1-
D f) 1--i ) '0
Page 3 of 8
-----:..- \?. 2?)" ( 1,'-e !J -;JY-etfl"' C .. I' o.f:;c'-o,bl e P.?lj,?lh
[ l ]_ ;{,6k) J 1/ ;.. ) ) r -;; Js;;;
\ \?i bl .g f.5l
Pc., . e>-5 J_. tl A A W Ill f\ V l " IV \ ,, u -'\ . f I 2--5
'""' . - 7;1./t,'t.fb Fs,
---
-------- ---
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 Overburden gradient = 1.1 psi/ft Poison ratio = 0.4 Depth = 10,000 ft
Page 4 of 8 .
Then based on the figure below, calculate formation pressure from Eaton's method. Would you expect kicks if drillin sto s?
l
110,000
1-155 1
\ \ \ _____ , " : \ . '
d ) -1-:-r c t I _r C,IC Je.
p -- J) J x I o / c; a:. : t' J 00 e> _ _i;J f
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).
0.
Please identify how many casing 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 -Fracture Gradient
6 7 8 9 10 11 12 13 14 15 16 Equivalent Mud Weight,ppg
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.
h Lll--r-"ih\7
I I I 4------t
,....
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