33. Directional DrillingPETE Well DrillingSlide 1 PETE 411 Well Drilling Lesson 33 Directional Drilling

33. Directional DrillingPETE Well DrillingSlide 2 Directional Drilling u When is it used? u Type I Wells u Type II Wells u Type III Wells u Directional Well Planning & Design u Survey Calculation Methods IIIIII

33. Directional DrillingPETE Well DrillingSlide 3 Read ADE Ch.8 (Reference) HW #15 due HW #16 due

33. Directional DrillingPETE Well DrillingSlide 4 Inclination Angle , I Direction Angle , A

33. Directional DrillingPETE Well DrillingSlide 5

33. Directional DrillingPETE Well DrillingSlide 6 Max. Horiz. Depart. ?

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33. Directional DrillingPETE Well DrillingSlide 8

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33. Directional DrillingPETE Well DrillingSlide 10

33. Directional DrillingPETE Well DrillingSlide 11

33. Directional DrillingPETE Well DrillingSlide 12 Type IType IIType III

33. Directional DrillingPETE Well DrillingSlide 13 xx yy I I r r LL

33. Directional DrillingPETE Well DrillingSlide 14

33. Directional DrillingPETE Well DrillingSlide 15 Fig. 8.11

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33. Directional DrillingPETE Well DrillingSlide 17 N18E N55W S20W S23E Azimuth Angle

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33. Directional DrillingPETE Well DrillingSlide 19 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 DrillingPETE Well DrillingSlide 20 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 DrillingPETE Well DrillingSlide 21 (i) Maximum Inclination Angle

33. Directional DrillingPETE Well DrillingSlide 22 (i) Maximum Inclination Angle

33. Directional DrillingPETE Well DrillingSlide 23 (ii) Measured Depth of Well

33. Directional DrillingPETE Well DrillingSlide 24 (ii) Measured Depth of Well

33. Directional DrillingPETE Well DrillingSlide 25 * The actual well path hardly ever coincides with the planned trajectory * Important: Hit target within specified radius

33. Directional DrillingPETE Well DrillingSlide 26 What is known? I 1, I 2, A 1, A 2,  L  =  MD 1-2 Calculate  = dogleg angle DLS =  L

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33. Directional DrillingPETE Well DrillingSlide 28 (20)