MODULE 11-DIRECTIONAL DRILLING Flashcards

1
Q

Define directional drilling?

A

Controlled deviation of a well bore along a planned course from a starting location to a target location.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Applications of directional drilling?

A
  • reservoir optimization
  • multiple exploration wells from one well bore
  • to conform to environmental regulations
  • relief wells
  • Sidetracking
  • Inaccessible locations
  • Salt dome drilling
  • Fault controlling
  • Multiwell Drilling
  • Horizontal wells
  • Extended Reach drilling
  • Multilateral wells
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What are the 3 well profiles?

A

J-Type
S-Type
Horizontal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What 3 things must you know to determine the best diametric profile from surface to TD?

A
  • surface position
  • target position
  • TVD
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Define KOP

A

The depth below surface the well will be deviated in a given directions (start of buildup section).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Define Well Inclination

A
The angle that the well bore deviated from vertical
Common angles (15-60 degrees)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Define EOB

A

The location where the well inclination has been reached.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Define hold angle

A

inclination is held constant (AKA Sail angle)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Define tangent angle

A

The section drilled with at the hold angle (AKA hold section or locked in section).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Define start of drop

A

where the well bore starts to drop inclination

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Define End of drop

A

where the well bore finishes dropping inclination

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Define target displacement

A

the lateral distance from the surface location to the target (D3)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Define target location

A

a defined point in space with geographical coordinates and a given true vertical depth

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

BUR and DOR are defined in?

A

degrees/30m or 100ft

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What are typical BUR and DOR rates?

A

1-2.5 degrees/30m

example 2.2/30m BUR or -3.2/30m DOR

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Define Turn rate

A

the rate a well turns in azimuth (expressed in degrees/30m or 100ft)

17
Q

Define measured depth

A

measured depth from surface to the actual well path.

18
Q

Define course length

A

Drilled distance between any 2 points in a directionally drilled wellbore

19
Q

Define horizontal displacement

A

distance between any 2 points along a well bore projected onto a horizontal plane or plan view.

20
Q

Define azimuth

A

Angle in the horizontal plane measured clockwise from a fixed reference direction (true north)

21
Q

What is the quadrant bearing of a well?

A

angle in the horizontal plane measured from either a North or South reference direction towards either or west, defining the direction of the well bore.

22
Q

When are J-type wells drilled?

A

where it is not possible to locate the surface location directly above the target or the multi well platform.

23
Q

What sections are in a J-type well? Draw it!

A

Straight section, a build section, a tangent section straight to target

24
Q

When are S-type wells drilled?

A

to improve the efficiency of the well and to assist in the location of a blown out well. (ensure accuracy in bottom hole spacing in offshore drilling)

25
What sections are in an S-type well? Draw it!
straight section, build section, tangent section, drop section
26
What sections are in a horizontal well?
bore with straight section a build section, a tangent section, a second build section, and a horizontal plane
27
What is spider plot and why is it used?
Viewed directly down a multi-well structure. | Used to show the relationship of the wells with respect to latitude and departure
28
Describe two instances where it might be necessary to drill directional well?
drilled where a vertical well is required and there is some limitation on the surface. - offshore structures - Environmentally sensitive area - surface obstructions
29
List the data you will require to be able to properly plan a directional well. Which of the rig parameters are different from a vertical well and why?
Data - Geology - Offset well information - Potential productivity Parameters - BHA tools - Drill pipe/collar - Mud types ``` different parameters which are different from vertical wells -derrick -drawworks -setback capabilities mud pump capabilities ```
30
In a standard directional plot the predicted well course and the after the fact course are both plotted beginning in one corner of the plot. What does this corner represent.
Represents the surface location