Lesson 33 Directional Drilling

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Presentation transcript:

Lesson 33 Directional Drilling PETE 411 Well Drilling Lesson 33 Directional Drilling

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

Read ADE Ch.8 (Reference) HW #17 due 11-27-02 HW #18 due 12-06-02

Inclination Angle q, a, I Direction Angle f, e, A

Max. Horiz. Depart. ?

Type I Type II Type III

r I Dy DL r I Dx

Fig. 8.11

N18E S23E Azimuth Angle N55W S20W

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, not the vertical depth)

(i) Maximum Inclination Angle

(i) Maximum Inclination Angle

(ii) Measured Depth of Well

(ii) Measured Depth of Well

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

What is known? Calculate I1 , I2 , A1 , A2 , DL = DMD1-2 Calculate b = dogleg angle DLS = b*100/DL DLS = dogleg severity

(20)