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902 Well Site Preparation and Drilling Safety
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Excavation and Trenching

The scale and duration of excavating and trenching are very minor and site-specific. On some drilling sites, a below-ground-level cellar may be excavated. This is where the main borehole is to be drilled. A reserve pit and settling pits may be excavated and are used for water or drilling fluid (mud) discharges.

Excavating the Mud Pit
Large field with a mud pit excavation

Potential Hazards

  • Dust and other airborne contaminants can cause respiratory problems or allergic reactions.
  • Buried pipelines and cables can be damaged.

Possible Solutions

  • Wear appropriate respiratory protection.
  • Perform a site line location survey.

Knowledge Check Choose the best answer for the question.

1-3. Which of the following is listed as a hazard when performing excavation of mud pits?