Pete 411 Directional Drilling

PETE 411 Well Drilling

Lesson 33 Directional Drilling

33. Directional Drilling

PETE 411 - Well Drilling

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Directional Drilling I

II

 When is it used?

KOP

 Type I Wells

EOC

 Type II Wells  Type III Wells

Build and Hold

Build-Hold and Drop

III

Continuous Build

 Directional Well Planning & Design  Survey Calculation Methods 33. Directional Drilling

PETE 411 - Well Drilling

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Read

ADE Ch.8

HW #15 HW #16

33. Directional Drilling

(Reference)

due 11-12-01 due 11-16-01

PETE 411 - Well Drilling

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Inclination Angle , I

Direction Angle , A

33. Directional Drilling

PETE 411 - Well Drilling

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33. Directional Drilling

PETE 411 - Well Drilling

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Max. Horiz. Depart. ?

33. Directional Drilling

PETE 411 - Well Drilling

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33. Directional Drilling

PETE 411 - Well Drilling

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33. Directional Drilling

PETE 411 - Well Drilling

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33. Directional Drilling

PETE 411 - Well Drilling

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33. Directional Drilling

PETE 411 - Well Drilling

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33. Directional Drilling

PETE 411 - Well Drilling

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Type I

Type II

Type III

Build-Hold and Drop

Continuous Build

KOP EOC

Build and Hold 33. Directional Drilling

PETE 411 - Well Drilling

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In the BUILD Section x = r (1 - cos I)

r

y = r sin I

I y

L

r I

L = r rad   L =   r Ideg  180  

18,000 r  * BUR

x 33. Directional Drilling

PETE 411 - Well Drilling

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33. Directional Drilling

PETE 411 - Well Drilling

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Fig. 8.11

r1  x 3 and r1  r2  x 4

33. Directional Drilling

PETE 411 - Well Drilling

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r1  x 3 and r1  r2  x 4

33. Directional Drilling

PETE 411 - Well Drilling

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N18E

S23E

Azimuth Angle

N55W

S20W 33. Directional Drilling

PETE 411 - Well Drilling

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33. Directional Drilling

PETE 411 - Well Drilling

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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)

33. Directional Drilling

PETE 411 - Well Drilling

Slide 19

Example 1: Design of Directional Well (i) Determine the maximum hole angle required. (ii) What is the total measured depth (MD)? (MD = well depth measured along the wellbore, not the vertical depth) 33. Directional Drilling

PETE 411 - Well Drilling

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(i) Maximum Inclination Angle 18,000 r1  15 . 

r2  0

 D 4  D1   12,500  2,500  10,000 ft 33. Directional Drilling

PETE 411 - Well Drilling

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(i) Maximum Inclination Angle

 max

 D  D  x 2  ( D  D ) 2  2( r  r ) x 1 4 4 1 1 2 4  2 tan 1  4 2(r1  r2 )  x 4 

  

2 2   -1 10,000  4,500  10,000  2(3,820) 4,500  2 tan   2(3,820)  4,500  

 max  26.3 33. Directional Drilling

PETE 411 - Well Drilling

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(ii) Measured Depth of Well x Build  r1 (1  cos )  3,820(1 - cos 26.3 ) 

 395 ft  x Hold  4,500  395  4,105 ft  L Hold sin   4,105  L Hold  9,265 ft 33. Directional Drilling

PETE 411 - Well Drilling

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(ii) Measured Depth of Well

MD  D1  r1 rad  L Hold  26.3   2,500  3,820   9,265  180 

MD  13,518 ft 33. Directional Drilling

PETE 411 - Well Drilling

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* The actual well path hardly ever coincides with the planned trajectory * Important: Hit target within specified radius 33. Directional Drilling

PETE 411 - Well Drilling

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What is known? I1 , I2 , A1 , A2 , L=MD1-2

Calculate

 = dogleg angle DLS =L

33. Directional Drilling

PETE 411 - Well Drilling

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33. Directional Drilling

PETE 411 - Well Drilling

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(20) 33. Directional Drilling

PETE 411 - Well Drilling

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