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Novel Drilling Technology Combining Hydro-Jet and Percussion for ROP Improvement in deep geothermal drilling

Objective

Deep geothermal reservoirs are being targeted for renewable energy supply worldwide. However, while international research efforts are stepping up to the challenge of overcoming the low efficiency of heat recovery from depth to the surface, the showstopper remains the slow drilling speed provided by the conventional rotary system in deep hard rocks (> 4 km). Deep drilling requires long drilling times, often resulting in unacceptably high initial investment.
ORCHYD’s new drilling technology will increase hard rock drilling rates from the current range of 1-2 m/h up to 4-10 m/h. The novelty is to combine two, previously separate, mature technologies: High Pressure Water Jetting (HPWJ) and Percussive Drilling, in a system customised for hard rock geothermal reservoirs to depths of 6 km.
Planned experiments and solid-fluid coupled models designed to reveal the critical fragmentation mechanisms under in-situ stress conditions will be used to design, build and validate, with pilot drilling tests, the new system for field operations.
The hybrid development requires optimisation of: i) release of high stress concentrations on the hole bottom while drilling, ii) slotting circumferential relieving grooves on the hole bottom using HPWJ (up to 200 MPa), iii) in-hole production of the HPWJ using a down-hole pressure intensifier activated by the drilling vibrations, hence damping out harmful drilling system vibrations and iv) an advanced down-hole percussive rotating mud hammer for drilling to derive the maximum benefit from the modified bottom-hole stress regime.
ORCHYD will decrease the drilling cost by 65% in hard rock sections. This will result in 30% reduction of the total cost of deep geothermal well construction. In addition, the new coupled Intensifier-HPWJ-Hammer system has the potential to drill and steer multi-lateral wells which greatly increase thermal connectivity, are cheaper, use far less water and are more controllable than conventional fracking stimulations.

Call for proposal

H2020-LC-SC3-2020-RES-RIA
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Funding Scheme

RIA-LS - Research and Innovation action Lump Sum

Coordinator

ASSOCIATION POUR LA RECHERCHE ET LE DEVELOPPEMENT DES METHODES ET PROCESSUS INDUSTRIELS
Address
Boulevard Saint Michel 60
75272 Paris
France
Activity type
Research Organisations
EU contribution
€ 1 268 033,75

Participants (5)

IMPERIAL COLLEGE OF SCIENCE TECHNOLOGY AND MEDICINE
United Kingdom
EU contribution
€ 831 256,25
Address
South Kensington Campus Exhibition Road
SW7 2AZ London
Activity type
Higher or Secondary Education Establishments
SINTEF AS
Norway
EU contribution
€ 742 225
Address
Strindvegen 4
7034 Trondheim
Activity type
Research Organisations
DRILLSTAR INDUSTRIES
France
EU contribution
€ 818 187,50
Address
Avenue Joliot-curie
64000 Lons Induspal Cedex
Activity type
Private for-profit entities (excluding Higher or Secondary Education Establishments)
UNIVERSITY OF PIRAEUS RESEARCH CENTER
Greece
EU contribution
€ 340 242,50
Address
Gr. Lampraki 122
185 32 Piraeus
Activity type
Higher or Secondary Education Establishments
CHINA UNIVERSITY OF PETROLEUM (EAST CHINA)
China
EU contribution
€ 0
Address
No 271 North 2 Road
266580 Dongying
Activity type
Higher or Secondary Education Establishments