280 likes | 753 Views
LESSON 11 Survey Calculation Methods. Radius of CurvatureBalanced TangentialMinimum CurvatureKicking Off from VerticalControlling Hole Angle (Inclination). . Homework. READ:Chapter 8 Applied Drilling Engineering", (? first 20 pages) . . Radius of Curvature Method . Assumption: The wellbor
E N D
1. Petroleum Engineering - 406 LESSON 19
Survey Calculation Methods
2. LESSON 11Survey Calculation Methods Radius of Curvature
Balanced Tangential
Minimum Curvature
Kicking Off from Vertical
Controlling Hole Angle (Inclination)
3. Homework READ:
Chapter 8 “Applied Drilling Engineering”, (? first 20 pages)
4. Radius of Curvature Method Assumption: The wellbore follows a smooth, spherical arc between survey points and passes through the measured angles at both ends. (tangent to I and A at both points 1 and 2).
Known: Location of point 1, ?MD12 and angles I1, A1, I2 and A2
5. Radius of Curvature Method
6. Radius of Curvature - Vertical Section In the vertical section, ?MD = R1(I2-I1)rad
?MD = R1 ( ) (I2-I1)deg I1 I2-I1
?R1= ( ) ( )
DMD
7. Radius of Curvature:Vertical Section
8. Radius of Curvature: Horizontal Section
9. Radius of Curvature Method
10. Radius of Curvature Method
11. Radius of Curvature - Equations
12. Angles in Radians If I1 = I2, then:
?North = ?MD sin I1
?East = ?MD sin I1
?Vert = ?MD cos I1
13. Angles in Radians If A1 = A2, then:
?North = ?MD cos A1
?East = ?MD sin A1
?Vert = ?MD
14. Radius of Curvature - Special Case If I1 = I2 and A1 = A2
?North = ?MD sin I1 cos A1,
?East = ?MD sin I1 sin A1
?Vert = ?MD cos I1
15. Balanced Tangential Method
16. Balanced Tangential Method
17. Balanced Tangential Method - Equations
18. Minimum Curvature Method This method assumes that the wellbore follows the smoothest possible circular arc from Point 1 to Point 2.
This is essentially the Balanced Tangential Method, with each result multiplied by a ratio factor (RF) as follows:
19. Minimum Curvature Method - Equations
20. Minimum Curvature Method
22. Tangential Method
23. Balanced Tangential Method
24. Average Angle Method
25. Radius of Curvature Method
26. Minimum Curvature Method
27. Mercury Method