Chuong 9 directional drilling

Petroleum Engineering 405 Drilling Engineering * Well Drilling Engineering Directional Drilling Dr DO QUANG KHANH * Directional Drilling When is it used? Type I Wells Type II Wells Type III Wells Dire[.]

Well Drilling Engineering

Directional Drilling

Dr DO QUANG KHANH

 Type III Wells

 Directional Well Planning & Design

 Survey Calculation Methods

Build and Hold Build-Hold and Drop Continuous Build

KOP EOC

Read ADE Ch.8 (Reference)

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Max Horiz Depart.

?

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10

Type I Type II Type III

Build

and Hold Build-Hold and Drop Continuous Build

KOP EOC

18 r





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Fig 8.11

4 2

1 3

4 2

1 3

N18E

N55W S20W

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)

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,

* The actual well path hardly ever coincides with

the planned trajectory

* Important: Hit target within specified radius

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