pete 411 well drilling
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1
PETE 411
Well Drilling
Lesson 33
Directional Drilling
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Directional Drilling
When is it used?
Type I Wells
Type II Wells
Type III Wells
Directional Well Planning & Design
Survey Calculation Methods
Build and Hold
Build-Hold and Drop
ContinuousBuild
KOP
EOC
I II III
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Read ADE Ch.8 (Reference)
HW #17 due 11-27-02HW #18 due 12-06-02
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Inclination Angle, I
Direction Angle, A
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Max.Horiz.
Depart.?
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8
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10
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Type I Type II Type III
Build and Hold
Build-Hold and Drop
ContinuousBuild
KOP
EOC
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x
y
I
I
r
rL
In the BUILDSection
x = r (1 - cos I)
y = r sin I
L = r rad
degI r180
= L
BUR*
000,18r
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Fig. 8.11
42131 xrr and xr
1642131 xrr and xr
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N18E
N55WS20W
S23E
Azimuth
Angle
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Example 1: Design of Directional Well
Design a directional well with the following restrictions:
• Total horizontal departure = 4,500 ft
• True vertical depth (TVD) = 12,500 ft
• Depth to kickoff point (KOP) = 2,500 ft
• Rate of build of hole angle = 1.5 deg/100 ft
• Type I well (build and hold)
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Example 1: Design of Directional Well
(i) What is the maximum hole angle required.
(ii) What is the total measured depth (MD)?
(MD = well depth measured along the wellbore,
not the vertical depth)
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(i) Maximum Inclination
Angle
ft820,35.1
000,18r1
0r2
ft000,10
500,2500,12
DD 14
ft500,4x4
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(i) Maximum Inclination Angle
500,4)820,3(2
500,4)820,3(2000,10500,4000,10tan 2
221-
3.26max
421
4212
1424141
max x)rr(2
x)rr(2)DD(xDDtan2
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(ii) Measured Depth of Well
ft 395
)26.3 cos-3,820(1
)cos1(rx 1Build
ft 4,105
395500,4xHold
ft 265,9L
105,4sinL
Hold
Hold
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(ii) Measured Depth of Well
Holdrad11 LrDMD
ft 518,13MD
265,9180
26.33,8202,500
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* The actual well path hardly ever coincides with the planned trajectory
* Important: Hit target within specified radius
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What is known?I1 , I2 , A1 , A2 ,
L=MD1-2
Calculate = dogleg angle
DLS =L
DLS = dogleg severity
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(20)
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