Directional Control with Rotary AssembliesĪn important aspect of directional drilling is the BHA design which is to drill the planned trajectory. Rule of thumb for orientation of ToolFace (at low inclinations, less than 30°). It should be noted that the tool face settings are based on the high side of the hole. It may not be applicable to slick motor and bent sub assemblies, used at higher inclinations (over 30o) in soft or medium soft formations.It will give the qualitative changes in inclination and azimuth which should result from drilling with the given tool face settings. The chart is applicable to steerable systems in most situations. The following chart is a rule of thumb which can be used when orienting deflection tools or steerable motors. The above formula is based on the fact that the high side direction is the azimuth of the borehole. High side toolface = mag/gyro toolface - hole azimuthĪ negative answer means the angle is measured anti-clockwise or left of high side. A magnetic or gyro toolface reading can be converted to a high side toolface reading using: It must be pointed out that the term toolface commonly used is a shortened version of "toolface orientation". 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 orientation is measured and expressed in this way at low inclinations, generally less than 5°. If measured by a "magnetic" type survey tool, it is called magnetic toolface whereas if it is measured by a gyroscopic survey device, it is called gyro toolface. Magnetic or Gyro Toolface is the toolface orientation measured as a direction on the horizontal plane. There are two ways of expressing toolface orientation: 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.
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