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

2. 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

3. Read ADE Ch.8 (Reference)
HW # due HW # due

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

6. Max.
Horiz.
Depart. ?

12. Type I
Type II
Type III

13. r I Dy DL r I Dx

15. Fig. 8.11

17. N18E
S23E
Azimuth
Angle
N55W
S20W

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. 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)

21. (i) Maximum Inclination Angle

22. (i) Maximum Inclination Angle

23. (ii) Measured Depth of Well

24. (ii) Measured Depth of Well

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

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

28. (20)