The toolface can be found using the following formula:

1. – toolface angle, deg.
2. – azimuth change, deg;
3. The number of wedges (
4. is the angle of the blade of the wedge.
5. – length of deviation section, m (ft);
6. Input data:
7. Calculation of dogleg angle.
8. The Dogleg of the correction to reach the required direction is 6.7 deg.

Magnetic toolface is the angle, or azimuth, of the borehole survey instrument within the wellbore measured clockwise relative to magnetic north and in the plane perpendicular to the wellbore axis; the north, east, south and west directions have magnetic toolface angles of 0°, 90°, 180° and 270°, respectively.

Gravity toolface is the angle of the borehole survey instrument within the wellbore measured clockwise relative to up and in the plane perpendicular to the wellbore axis; the high side (maximum build), maximum right, low side (maximum drop) and maximum left directions have gravity toolface angles of 0°, 90°, 180° and …

The magnetic or gyro toolface is the orientation of the tool face measured on a perpendicular plane. When measured using a magnetic tool, it is called a magnetic toolface and when measured by a gyroscope, it is called a gyro toolface.

The high-side is the top of the hole perpendicular to the wellbore axis and the low side is the bottom of the hole (Figure 2). The tool is measure in relative to high-side tool face.

High-side toolface is the angle of the borehole survey instrument within the wellbore measured clockwise relative to up and in the plane perpendicular to the wellbore axis; the high side (maximum build), maximum right, low side (maximum drop) and maximum left directions have high-side toolface angles of 0°, 90°, 180° …

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Last Updated on Wed, 06 Jan 2021 | Drilling Engineering The ” Toolface ” of a deflection tool, or a steerable motor system, is the part (usually marked with a scribe line) which is oriented in a particular direction to make a desired deflection within the wellbore. There are two ways of expressing toolface orientation:

1. n. [Drilling] The angle measured in a plane perpendicular to the drillstring axis that is between a reference direction on the drillstring and a fixed reference. For near-vertical wells, north is the fixed reference and the angle is the magnetic toolface.

Toolface orientation is measured and expressed in this way at low inclinations, generally less than 5°. High Side Toolface is the toolface orientation measured from the high side of the borehole in a plane perpendicular to the axis of the hole.

Toolface : Magnetic Tool Face (MTF) , Gravity Tool Face (GTF) , Tool Face Orientation. The sensors used in steering tools and MWD/LWD tools are solid-state electronic devices known as magnetometers and accelerometers which respond to the earth’s magnetic field and gravitational field respectively.