喷射-由引擎发动的旋喷

由引擎发动的旋喷是一种喷射技术，它使用引擎旋转钻柱并将泥浆抽出。现使用多种规格的由引擎发动的旋转钻井设备。在发展中国家使用的商业钻井设备为Lone Star 100、PAT Drill 201和 Deep Rock Hydra；还有很多其他类型。

虽然人们预计使用引擎比使用人工的优势更大，但就旋喷而言，其实两者用时相同，钻取的深度也相同。由引擎发动的技术只是在人类工程学方面的表现更胜一筹。

在乍得使用旋转钻机

Self made rotary rig

Diagram of the LS100

PAT drill 201

Suitable conditions

Suitable for weakly cohesive sands and silts.

Advantages	Disadvantages
- Better performance with regard to ergonomic aspects than manual jetting rigs	- Does not increase speed or depth as compared to manual operate rotary jetting rigs.

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

• PAT-Drill - Engine powered drilling equipment and small machines.
• Lone Star Bit - Engine powered drilling equipment and small machines.
• Deep Rock - Engine powered drilling equipment and small machines.
• Drillingfab - Engine powered drilling equipment and small machines.

Acknowledgements

• 43. Simple drilling methods. WEDC.