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Chapter 5 Drilling Techniques and Drilling Problems

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Chapter 5 Drilling Techniques and Drilling Problems * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Well deviates – PowerPoint PPT presentation

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Title: Chapter 5 Drilling Techniques and Drilling Problems


1
Chapter 5 Drilling Techniques and Drilling
Problems
2
Straight hole
Well deviates lt 3 deg. per 100 ft (30m) Cone
with a maximum angle of 5 deg
3
If the bit hits a subsurface rock layer with a
dip greater than 45 deg., the bit tends to be
deflected down dip. If rock layer dip less than
45 deg., the bit tends to be deflected updip.
A well with an excessive angle in it that has not
been drilled on purpose that way is call a
crooked hole.
4
Directional Drilling or Deviation Drilling
Modern rotary rigs can be controlled so that the
well is drilled out at a pre-determined angle
during directional or deviation drilling and ends
up in a pre-determined location called target.
5
Directional Drilling
  • Directionally drilled wells will usually be
    drilled according to one of three basic hole
    patterns.

6
Directional Drilling
  • After making an initial deflection from vertical,
    the well may be drilled to the target , or
    deflected once more to allowed the bottom of the
  • hole to be drilled
  • vertically
  • (double dogleg).

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8
Uses of Directional Drilling
9
Situation Requiring Directional Drilling
10
Directional Drilling
  • The deviation begins when the hole is deflected
    using one of several techniques
  • (1) downhole hydraulic motors with a
  • bent sub
  • (2) jet bits
  • (3) whipstocks

11
Downhole hydraulic motors with a bent sub
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13
Device used to kick off a well
14
Jet bit
15
Jet bit
16
Whipstock
17
Whipstock
18
A steerable downhole assembly is a combination of
stabilizers, bent subs, downhole turbine motor,
and diamond bit that can maintain, drop, or build
angle.
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20
Plot of well survey data showing paths of
directionally drilled wells
21
Extended Reach Well and Horizontal Drain Well
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23
Depth of a Well
24
Problems while drilling
  • Fishing
  • Stuck pipe
  • Sloughing shale
  • Lost circulation
  • Formation damage
  • Corrosive gases
  • Abnormal high pressure

25
Differential sticking of drillpipe because of
heavy mud weight
26
Crooked wellbore showing view of key seated
drillpipe
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28
Three types of junk baskets for retrieving
foreign objects from hole
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