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PETE 661 Drilling Engineering

Slide 2. Directional Drilling. When is it used? Type I Wells Type II Wells Type III Wells Directional Well Planning

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PETE 661 Drilling Engineering

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    1. Slide 1 PETE 661 Drilling Engineering

    2. Slide 2 Directional Drilling When is it used? Type I Wells Type II Wells Type III Wells Directional Well Planning & Design Survey Calculation Methods

    3. Slide 3 Read ADE Ch.8 (Reference)

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    15. Slide 15 Fig. 8.11

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    17. Slide 17 Azimuth Angle

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    19. Slide 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)

    20. Slide 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)

    21. Slide 21 (i) Maximum Inclination Angle

    22. Slide 22 (i) Maximum Inclination Angle

    23. Slide 23 (ii) Measured Depth of Well

    24. Slide 24 (ii) Measured Depth of Well

    25. Slide 25 * The actual well path hardly ever coincides with the planned trajectory * Important: Hit target within specified radius

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    29. Slide 29 Wellbore Surveying Methods Average Angle Balanced Tangential Minimum Curvature Radius of Curvature Tangential Other Topics Kicking off from Vertical Controlling Hole Angle

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    31. Slide 31 Example - Wellbore Survey Calculations The table below gives data from a directional survey. Survey Point Measured Depth Inclination Azimuth along the wellbore Angle Angle ft I, deg A, deg A 3,000 0 20 B 3,200 6 6 C 3,600 14 20 D 4,000 24 80 Based on known coordinates for point C we’ll calculate the coordinates of point D using the above information.

    32. Slide 32 Example - Wellbore Survey Calculations Point C has coordinates: x = 1,000 (ft) positive towards the east y = 1,000 (ft) positive towards the north z = 3,500 (ft) TVD, positive downwards

    33. Slide 33 Example - Wellbore Survey Calculations I. Calculate the x, y, and z coordinates of points D using: (i) The Average Angle method (ii) The Balanced Tangential method (iii) The Minimum Curvature method (iv) The Radius of Curvature method (v) The Tangential method

    34. Slide 34 The Average Angle Method Find the coordinates of point D using the Average Angle Method At point C, X = 1,000 ft Y = 1,000 ft Z = 3,500 ft

    35. Slide 35 The Average Angle Method

    36. Slide 36 The Average Angle Method

    37. Slide 37 The Average Angle Method

    38. Slide 38 The Average Angle Method

    39. Slide 39 The Average Angle Method

    40. Slide 40 The Average Angle Method At Point D, X = 1,000 + 99.76 = 1,099.76 ft Y = 1,000 + 83.71 = 1,083.71 ft Z = 3,500 + 378.21 = 3,878.21 ft

    41. Slide 41 The Balanced Tangential Method

    42. Slide 42 The Balanced Tangential Method

    43. Slide 43 The Balanced Tangential Method

    44. Slide 44 The Balanced Tangential Method

    45. Slide 45 The Balanced Tangential Method At Point D, X = 1,000 + 96.66 = 1,096.66 ft Y = 1,000 + 59.59 = 1,059.59 ft Z = 3,500 + 376.77 = 3,876.77 ft

    46. Slide 46 Minimum Curvature Method

    47. Slide 47 Minimum Curvature Method

    48. Slide 48 Minimum Curvature Method The dogleg angle, b , is given by:

    49. Slide 49 Minimum Curvature Method The Ratio Factor,

    50. Slide 50 Minimum Curvature Method

    51. Slide 51 Minimum Curvature Method At Point D, X = 1,000 + 97.72 = 1,097.72 ft Y = 1,000 + 60.25 = 1,060.25 ft Z = 3,500 + 380.91 =3,888.91 ft

    52. Slide 52 The Radius of Curvature Method

    53. Slide 53 The Radius of Curvature Method

    54. Slide 54 The Radius of Curvature Method

    55. Slide 55 The Radius of Curvature Method At Point D, X = 1,000 + 95.14 = 1,095.14 ft Y = 1,000 + 79.83 = 1,079.83 ft Z = 3,500 + 377.73 = 3,877.73 ft

    56. Slide 56 The Tangential Method

    57. Slide 57 The Tangential Method

    58. Slide 58 The Tangential Method

    59. Slide 59 Summary of Results (to the nearest ft) X Y Z Average Angle 1,100 1,084 3,878 Balanced Tangential 1,097 1,060 3,877 Minimum Curvature 1,098 1,060 3,881 Radius of Curvature 1,095 1,080 3,878 Tangential Method 1,160 1,028 3,865

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