الجمعة، 17 نوفمبر 2017

Directional Concepts

an abrupt change in direction in the wellbore, frequently resulting in the formation of a key-seat.
a sharp bend permanently put in an object such as a pipe, wire rope, or a wire rope sling.
Deflection angel > 3o/100 ft

Angle of Deflection
in directional drilling, the angle at which a well diverts from vertical
usually expressed in degrees
In vertical, being zero.

in directional drilling, the direction of the wellbore or of the face of a deflection tool in degrees (0 -359 ) clockwise from true north.
an arc of the horizon measured between a fixed point (such as true north) and the vertical circle passing through the center of an object.
 Steering Tool
A directional survey instrument used in combination with a deflected downhole motor. It shows, on a rig floor monitor, the inclination and direction of a downhole sensing unit.
Systems and Coordinates
Depth Reference
Measured Depth (MD)
True Vertical Depth (TVD)
Inclination (Drift)
The angle (in degrees) between the local vertical (local gravity vector as indicated by a plumb bob) and the tangent to the well bore axis at a particular point.
By oilfield convention, 0° is vertical and 90° is horizontal.
Rigsite use of the term toolface” is often used as a shortening of the phrase “toolface orientation”. This can be expressed as a direction from North or topside of the wellbore.
Toolface Orientation is the angular measurement of the toolface of a deflection tool with respect to either North or up (highside).
Highside/Magnetic Toolface
   —Highside Toolface 
indicates whether a component is facing up, down, to the left or right 
Magnetic Toolface 
an angular measurement from North

Mag TFO = Azimuth + Highside
Azimuth (Hole Direction)
the direction of the borehole on the horizontal plane, measured as a clockwise angle (0°- 360°) from the North reference.
All magnetic tools give readings referenced to Magnetic North; however, the final calculated coordinates are referenced to True North
Quadrant Bearings
the directions are expressed in degrees from 0°to 90° measured from North in the two Northern quadrants and from the South in the Southern quadrants, e.g., N87°E, S12°W, S90°W.
Direction Measurement
Azimuth Reference
Quadrant Bearings

Directional Concepts Reviewed by الحريف on نوفمبر 17, 2017 Rating: 5 Dogleg an abrupt change in direction in the wellbore, frequently resulting in the formation of a key-seat. a sharp bend permane...

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