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Engine powered rotary jetting is a [[Jetting - general| jetting technique]] in which engine power is used to rotate the drill stem and pump the mud. A large variety of engine powered rotary jetting rigs are used. Examples of commercial versions used in developing countries are the Lone Star 100, the PAT Drill 201 and the Deep Rock Hydra drill; but many more exist.
===Suitable conditions ===
Suitable for weakly cohesive sands and silts.
[[File: Drilling Method Selection.jpg|thumb|none|750px|This table may be used as a guide in the selection of the most appropriate drilling methods. Credit: WEDC.]]
===Construction, operations and maintenance===
A self made engine-driven rotary rig is not very difficult to make, although drill bits, drill pipes and engine may have to be specially imported.
===Costs===
The price of these rigs depends and varies between US$ 3000 and US$ 5000.
===Field experiences===
Engine operated rotary jetting is mainly used in Thailand, Laos, Cambodia, Chad, Niger, Nigeria, Burkina Faso, Tanzania, Mozambique, Zambia, Mauritania, Madagascar and Nicaragua.
===Manuals, videos, and links===
* [http://www.pat-drill.com PAT-Drill] - Engine powered drilling equipment and small machines.
* [http://www.lonestarbit.com Lone Star Bit] - Engine powered drilling equipment and small machines.
* [http://www.drillingfab.com Drillingfab] - Engine powered drilling equipment and small machines.
===Acknowledgements===
* [http://www.lboro.ac.uk/well/resources/technical-briefs/43-simple-drilling-methods.pdf 43. Simple drilling methods.] WEDC.
