Short radius wells, typically re-entries of old vertical wells, have curves with a 143 ft (44 m) radius or smaller that cannot be drilled with conventional motors. They are used to isolate higher-/lower-pressured production zones or water sands without setting and cementing a liner. This type of drilling is desirable when kicking off below a problem formation.
Medium radius wells have curves with a 200-500 ft (61-152 m) radius that can be drilled with conventional motors.
Long radius wells have curves with a 750 ft (229 m) radius or larger that can also be drilled with conventional motors.
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