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Sludging - Rota sludge

166 bytes added, 03:09, 17 July 2012

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[[Image:Icon_sludge.png|right]]

[[Image:Rota sludge in action.jpg|thumb|right|250px|Rota sludge in action]]

The Rota Sludge method can be used to drill 2-5 inch wells up to 20 m deep.

 {{procontable | proborder="1" cellpadding="5" cellspacing="0" align="center"|-! width="50%" style="background:#efefef;" | Advantages! style="background:#ffdead;" | Disadvantages|-| valign="top" | - Easy to handle and a temporary casing is normally not needed. It is possible to construct the drilling equipment locally.<br>

- Can drill through softer-consolidated formations.

|convalign= "top" | - The borehole stays open by water pressure. To prevent collapsing, fluid-drilled boreholes must be kept full of water during the entire drilling and well installation process.<br>

- Coarse gravel and other highly permeable materials (cracks in the formation) cause loss of working water and cannot be drilled. If very fine sands (quick sands) are encountered in the first three meter of the borehole, a temporary casing and swell clay are needed on the outside of this casing to prevent collapse.<br>

- If cow dung is used as drilling fluid, this can cause contamination of the well, which can take several weeks to disappear. |}} 

==Construction, operations and maintenance==

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