Match each well profile feature with its definition Jsb
a) Occurs after a buildup where the inclination of the borehole is held constant for a certain distance b) The azimuth angle measured from North or South in the direction of East or West
- A point defined by a distance and a direction relative to North d) Used to give a target's position in feet or meters with direction of North/South and East/West e) The location where the wellbore has finished increasing
- Tangent Section
- Polar Coordinate
- Rectangular Coordinate
- Quadrant
- End of Buildup
Introduction to Directional Drilling Revised: 10/20/98 6:37 AM 5.2 Types of Directional Well Profiles
In general, directional wells can be either:
- Straight (Vertical),
- S-type,
- Slant (J-type), or
- Horizontal.
The type of profile selected will depend upon the geological objectives and the production mechanism of the well.
5.2.1 Straight Well (Vertical)
Straight wells have a bore with no planned deviation from vertical.
5.2.1 Straight Well (Vertical)
Straight wells have a bore with no planned deviation from vertical.
5.2.2 S-Type Well
S-type wells have a bore with a straight section, a build section, a tangent section, and a drop section.
This type of well is drilled to improve the efficiency of the well and to assist in the location of a blown-out well. In offshore drilling, S-type wells can ensure accuracy in bottomhole spacing when multiple wells are drilled from the same platform.
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Straight | |
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Section | |
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Tangent Section \ filli | |
Slant wells, sometimes called J-type wells, have a bore with a straight section, a build section, and a tangent section straight to the target
Slant or J-type wells are drilled where it is not desirable or possible to locate the surface location directly above the target or a multiwell platform.
5.2.4 Horizontal Well
Horizontal wells have a bore with a straight section, a build section, tangent section, a second build section (most of the time), and a horizontal section.
The well is drilled to a point above the reservoir; then it is deflected and the angle increases until it reaches 90 degrees or more. When properly applied, one horizontal borehole can produce a reservoir better than several vertically drilled wells.
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