Oklahoma Energy Resources Board has a video that gives a good overview of horizontal drilling and fracturing techniques. YouTube has several videos on the same topic, but their audio tracks are either A) non-existent, or B) overfull of emotional drivel. The video from Halliburton (above) covers just the drill motor.
There are two kinds of horizontal drilling:
- the kind used for drilling oil and gas wells, and
- the kind used for near-surface construction projects, where a pipe has to be installed beneath an existing structure.
Conventional well drilling is done by turning the whole drill stem, much like you use an electric drill to turn a drill bit to drill a hole in a piece of wood. For directional drilling, which includes horizontal drilling, the drill pipe does not turn. It is used to conduct high pressure fluid to a hydraulic drill motor on the end of the drill string. (Drill string is the term for all of the sections of pipe strung together.)
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