Journal Article

Impact of Temperature on the Performance of Plasma-Pulse Geo-Drilling (PPGD)

Adams, Benjamin M, Rossi, Edoardo, Wittig, Volker, Vogler, Daniel, Biela, Jürgen, Schiegg, Hans-Olivier, Saar, Martin O, Börner, Jascha, Ezzat, Mohamed, Kammermann, Benedikt

2024

Overview

Advanced Geothermal Systems (AGS) may in principle be able to satisfy the global energy demand using standard continental-crust geothermal temperature gradients of 25–35 ∘C/km. However, conventional mechanical rotary drilling is still too expensive to cost-competitively provide the required borehole depths and lengths for AGS. This highlights the need for a new, cheaper drilling technology, such as Plasma-Pulse Geo-Drilling (PPGD), to improve the economic feasibility of AGS. PPGD is a rather new drilling method and is based on nanoseconds-long, high-voltage pulses to fracture the rock without mechanical abrasion. The absence of mechanical abrasion prolongs the bit lifetime, thereby increasing the penetration rate. Laboratory experiments under ambient-air conditions and comparative analyses (which assume drilling at a depth between 3.5 and 4.5 km) have shown that PPGD may reduce drilling costs by approximately 17–23%, compared to the costs of mechanical drilling, while further research and development are expected to reduce PPGD costs further. However, the performance of the PPGD process under deep wellbore conditions, i.e., at elevated temperatures as well as elevated lithostatic and hydrostatic pressures, has yet to be systematically tested. In this paper, we introduce a standard experiment parameter to examine the impact of deep wellbore conditions on PPGD performance, namely the productivity (the excavated rock volume per pulse) and the specific energy (the amount of energy required to drill a unit volume of rock). We employ these parameters to investigate the effect of temperature on PPGD performance, with temperatures increasing up to 80 ∘C, corresponding to a drilling depth of up to approximately 3 km.HighlightsThis study introduces an experiment protocol for studying the impact of deep wellbore conditions on Plasma-Pulse Geo-Drilling performance.When deionized water is used, increasing the temperature decreases Plasma-Pulse Geo-Drilling productivity and increases the specific energy.The effect of increasing temperature on Plasma-Pulse Geo-Drilling depends significantly on the drilling fluid used.Deionized water negatively affects Plasma-Pulse Geo-Drilling, while other studies have shown that the effect of oil-based drilling muds is negligible.

• Publisher: Springer Nature B.V
• Subject: Abrasion / Boreholes / Comparative analysis / Costs / Deionization / Depth / Drilling / Drilling fluids / Drilling muds / Economic feasibility / Energy / Energy demand / High temperature / Laboratory experimentation / Parameters / Plasma / Productivity / R&D / Research & development / Rock / Rocks / Rotary drilling / Specific energy / Temperature / Temperature effects / Temperature gradients / Voltage pulses