Directional Drilling

Question 1

What 3 parameters define a directional well?

Answer 1

• Inclination (angle between the vertical and a tangent to the well path)
• True Vertical Depth
• Horizontal Displacement

Question 2

What is the Azimuth?

Answer 2

Angle measured on a horizontal place between the direction of north and a point on the well path

Question 3

What is the kick off point?

Answer 3

Point at which the well is deviated from the vertical

Question 4

What is the dog-leg?

Answer 4

Angular change between two points on the well path and can result from changes in inclination, direction or both

Question 5

What is the tangential method equation?

Answer 5

dV = Lcosa2
dN = Lcosa2cosb2
dE = Lsina2sinb2

Question 6

What is the balanced tangential method equation?

Answer 6

dV = L/2 (cosa1 + cosa2)
dN = L/2 (sina1cosb1 + sina2cosb2)
dE = L/2 (sina1sinb1 + sina2sinb2)

Question 7

What is the angle averaging method equation?

Answer 7

dV = Lcos(a1 + a2/ 2)
dN = Lsin(a1 + a2/ 2)cos(b1 + b2/ 2)
dE = Lsin(a1 + a2/ 2)sin(b1 + b2/ 2)

Question 8

What is the equation for dog-leg severity?

Answer 8

DLS = 100 * (dog leg angle/L)

Question 9

What are the 4 steps of completing an oil well?

Answer 9

• Setting a production packer (seals the annulus from the reservoir pressure and confines fluids to the production tubing)
• Running the production tubing
• Perforating the producing zones
• Attaching the Christmas Tree