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DRILLING-YEAR 2 > MODULE 11-DIRECTIONAL DRILLING > Flashcards

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.

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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
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3
Q

What are the 3 well profiles?

A

J-Type
S-Type
Horizontal

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4
Q

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

A
  • surface position
  • target position
  • TVD
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5
Q

Define KOP

A

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

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6
Q

Define Well Inclination

A 
The angle that the well bore deviated from vertical
Common angles (15-60 degrees)
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7
Q

Define EOB

A

The location where the well inclination has been reached.

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8
Q

Define hold angle

A

inclination is held constant (AKA Sail angle)

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9
Q

Define tangent angle

A

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

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10
Q

Define start of drop

A

where the well bore starts to drop inclination

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11
Q

Define End of drop

A

where the well bore finishes dropping inclination

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12
Q

Define target displacement

A

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

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13
Q

Define target location

A

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

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14
Q

BUR and DOR are defined in?

A

degrees/30m or 100ft

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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

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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
Q

What sections are in an S-type well? Draw it!

A

straight section, build section, tangent section, drop section

26
Q

What sections are in a horizontal well?

A

bore with straight section a build section, a tangent section, a second build section, and a horizontal plane

27
Q

What is spider plot and why is it used?

A

Viewed directly down a multi-well structure.

Used to show the relationship of the wells with respect to latitude and departure

28
Q

Describe two instances where it might be necessary to drill directional well?

A

drilled where a vertical well is required and there is some limitation on the surface.

  • offshore structures
  • Environmentally sensitive area
  • surface obstructions
29
Q

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?

A

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
Q

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.

A

Represents the surface location

DRILLING-YEAR 2 (4 decks)

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