Geo-Drill: Development of Novel and Cost-effective Drilling Technology for Geothermal Systems
Feifei ZHANG, Henry BEGG, Namrata KALE, Sandeep IRUKUVARGHULA, Kate FRANKLIN, Kevin MALLIN, Volker WITTIG, Simon HAHN, Beatriz RODRIGUEZ, Fahim CHOWDHURY, Mohammad HOQUE, Sigrún KARLSDÓTTIR, Gifty BOAKYE, Per KJELLGREN, Pufinji OBENE, Kristján ALEXANDERSSON, Sunna WALLEVIK
[TWI Ltd, United Kingdom]
Geothermal is one of the most under-utilized renewable energy sources due to relatively higher investment costs, less certainty of output and longer development cycle. One of the major elements contributing to the overall cost in any deep geothermal project, is related to the drilling of production and re-injection wells. Cost increases result from increased drilling depths, longer tripping times (higher Non-Productive Times), potentially harsh environments, uncertainties of lithologies and potentially poor “resource” qualities (Temperature, Permeability). It is estimated that drilling costs contribute between 30 and 70% of the overall expenditure of a deep geothermal project. The project Geo-Drill (Funded under the EU’s H2020 programme, Grant agreement no 815319) is focused on the development of a “holistic” drilling technology that has the potential to drastically reduce the cost of drilling to large depths (5km or more) and at high temperatures (250°C or more). The scope of Geo-Drill is: a) to develop and test advanced materials and coatings in simulated geothermal environments for drilling components, including graphene oxide based materials, cermet coatings, Nickel alloy coatings, nanocrystalline/amorphous coatings, high entropy alloy coatings etc., b) to test and validate new designs and joining technologies for components such as drill bit, tool joint, etc., c) to design and manufacture a prototype 4 inch DTH mud hammer integrated with drill monitoring system based on 3D printed sensors combined with simulators, d) test and validate prototypes in laboratory environments, followed by field testing and validation at IEG-Fraunhofer’s test site in Bochum, Germany. In this paper, developments in the early stage of Geo-Drill related with novel materials and coatings, new DTH mud hammer design are being reported.
|        Topic: Drilling and Completion Technology||Paper Number: 21060|