PETE 411 Well Drilling

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PETE 411Well Drilling
Lesson 33 Directional Drilling
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Directional Drilling
I
II
III

• When is it used?
• Type I Wells
• Type II Wells
• Type III Wells
• Directional Well Planning Design
• Survey Calculation Methods

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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 q, a, I
Direction Angle f, e, A
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Max. Horiz. Depart. ?
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Type I
Type II
Type III
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r
I
DL
Dy
r
I
Dx
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Fig. 8.11
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N18E
S23E

• Azimuth
• Angle

N55W
S20W
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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
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(i) Maximum Inclination Angle
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(ii) Measured Depth of Well
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(ii) Measured Depth of Well
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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 , DL DMD1-2
Calculate b dogleg angle DLS b100/DL
DLS dogleg severity
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