Drilling and completing new wells are costly. Those costs account for 30 % to 70% of the initial capital expenses for oil and gas field developments.
The first step in this paper, which is primarily a literature overview, was to establish a list of advanced concepts and technologies, as well as their applications, advantages and disadvantages, etc.
The second step was to describe each of the concepts in terms of how they operate and perform based on following criteria: technical description, environmental impact, rate of penetration and applications and how that performance is, compared with what we call conventional rotary drilling.
The paper will conclude with some possible future drilling systems.

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