Operations Manual
Low Angle Steering The following practices should be followed when drilling with the RST at inclinations below 20 o . The choice of steering mode is crucial when at low angles. Gravity steering and INC Hold modes can show inconsistent steering results when used below 20 o , therefore magnetic steering mode will predominantly be used up to 20 o . Controlling Azimuth at Low Angles Sudden changes in azimuth can occur when drilling at low angles. The table below has recommendations to reduce large azimuth swings.
Steering Percentage
Magnetic toolface o of current azi +/- 165
Objective
Flow Rate
Moderate drop, azi change of <10o Slight drop, azi change of <10 o Hold angle, azi change of <10 o Slight build, azi change of <10 o Aggressive build, azi change of <10 o
100% of target flow Reduce flow by 5-10% 100% of target flow 100% of target flow 100% of target flow
20%
+/- 15 o of current azi
20%
+/- 15 o of current azi
20-40%
+/- 15 o of current azi
40-60%
+/- 15 o of current azi
60-80%
These are recommended starting points. Formation tendencies can affect results and small incremental changes in steering percentage and flowrate should be taken to combat formational influence.
When drilling in magnetic mode the current azimuth should be considered the high- side for the tool when choosing an appropriate toolface to steer with.
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