تعاریف کلیدی حفاری کج

Azimuth:

The angle of the well bore direction as projected to a horizontal plane and relative to due north. By industry convention, 0 degree azimuth coincides with North, 90 degree azimuth with East, 180 degree azimuth with South, and 270 degree azimuth with West.

Azimuthal Deviation:

 The difference in azimuth between actual and planned well paths, typically at a specific measured depth.

Directional Survey:

 A summary of geometric information; calculated with directional survey data and a directional survey calculational method (e.g., minimum curvature method); that pertains to spatial properties (e.g., Cartesian coordinates) of a directional well; sometimes synonymous with directional survey data or directional survey station.

 Directional Survey Data: 

Typically refers to the "raw" data acquired at a directional survey station, namely, well bore inclination and azimuth at specific measured depths.

Directional Survey Station:  

A reference point that corresponds to a measured depth along the (typically actual) well path where well bore inclination and azimuth are observed/measured and recorded.

Inclination:

The angle of the well bore defined by a tangent line and a vertical line. The vertical line is always parallel to the direction of earth's gravity. By industry standard, 0 degree inclination is vertical (downward pointing) and 90 degrees inclination is horizontal. An inclination (angle) greater than 90 degrees coincides with the term "drilling up".

Inclinational Deviation: 

The difference in inclination between actual and planned well paths, typically at a specific measured depth.

Build:

Drilling directionally with the intent to increase well bore inclination; also refers to increasing and orienting lateral bit force magnitude to or towards the high side of the drill hole.

Turn: 

Drilling directionally with the intent to change (increase or decrease) well bore azimuth.

 

Trajectory: Same as well path, either actual or planned; the traverse that defines the actual or preferred existence of a well bore via spatial properties.

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