Usually an intermediate casing is set at this landing point to isolate the pay zone.
Horizontal distance between survey point and North-South axis in plan view.ĭirectionally controlled drilling of a well, usually with the intent of keeping the hole in the pay zone, achieving maximum exposure to the reservoir.įirst point in a horizontal well trajectory where the inclination reaches 90º. In an “S” shape well, the section where a well is steered back to vertical after a build and hold section. High doglegs pose difficulty in tripping and running casing or liner.ĭecrease of inclination in horizontal drilling also increase in TVD as a direct result of dropping angle. Ĭombination of build and turn rate normalized measure of curvature ( bend and turn) at a certain point. Length of wellpath projected on horizontal plane (plan view). Section of a well where the wellpath is changed to a different inclination, usually from vertical (0º) to horizontal (90º). Typical build rates in a build section of a horizontal well are 6-8º/30m. Inclination angle difference between two consecutive survey points, extrapolated to 30m meters (or 100 feet) measured in vertical plane. Increase of inclination in horizontal drilling also decrease in TVD as a direct result of building angle. Usually a mud motor is “dialled” at 1.8º to 2.8º on the build section, and 1.5º to 1.8º on a horizontal section. Also called “Drift direction”.Īngle between downhole mud motor and drill bit, used to achieve build or turn while sliding. 0º for heading North, 90º for heading East, 180º for heading South, 270º for heading West. Compass heading of trajectory, angle between wellpath and North axis (true north or magnetic North) measured in plan view, clockwise from North.
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